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? 2010 microchip technology inc. ds21909d-page 1 mcp9800/1/2/3 features: temperature-to-digital converter accuracy with 12-bit resolution: - 0.5c (typical) at +25c - 1c (maximum) from -10c to +85c - 2c (maximum) from -10c to +125c - 3c (maximum) from -55c to +125c user-selectable resolution: 9-12 bit operating voltage range: 2.7v to 5.5v 2-wire interface: i 2 c?/smbus compatible operating current: 200 a (typical) shutdown current: 1 a (maximum) power-saving one-shot temperature measurement available packages: sot-23-5, msop-8, soic-8 typical applications: personal computers and servers hard disk drives and other pc peripherals entertainment systems office equipment data communication equipment mobile phones general purpose temperature monitoring typical application description: microchip technology inc.s mcp9800/1/2/3 family of digital temperature sensors converts temperatures between -55c and +125c to a digital word. they provide an accuracy of 1c (maximum) from -10c to +85c. the mcp9800/1/2/3 family comes with user-programmable registers that provide flexibility for temperature sensing applications. the register settings allow user-selectable 9-bit to 12-bit temperature measurement resolution, configuration of the power-saving shutdown and one-shot (single conversion on command while in shutdown) modes and the specification of both temperature alert output and hysteresis limits. when the temperature changes beyond the specified limits, the mcp9800/1/2/3 outputs an alert signal. the user has the option of setting the alert output signal polarity as an active-low or active-high comparator output for thermostat operation, or as temperature event interrupt output for microprocessor-based systems. this sensor has an industry standard 2-wire, i 2 c?/ smbus compatible serial interface, allowing up to eight devices to be controlled in a single serial bus. these features make the mcp9800/1/2/3 ideal for sophisticated multi-zone temperature-monitoring applications. package types pic ? v dd r microcontroller mcp9800/02 gnd v dd alert sda sclk 4 1 2 3 5 i 2 c? port i/o port r pull-up pic16f737 sda gnd alert sclk gnd v dd alert sda sclk 4 mcp9800 mcp9802 1 2 3 5 sot-23-5 mcp9801 mcp9803 1 2 3 4 8 7 6 5 soic, msop a0 v dd a1 a2 mcp9802/03: serial bus time-out 35 ms (typ.) mcp9800/01: no serial bus time-out 2-wire high-accuracy temperature sensor downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 2 ? 2010 microchip technology inc. notes: downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 3 mcp9800/1/2/3 1.0 electrical characteristics absolute maximum ratings ? v dd ....................................................................... 6.0v voltage at all input/output pins .....gnd C 0.3v to 5.5v storage temperature .......................... -65c to +150c ambient temp. with power applied ..... -55c to +125c junction temperature (t j ) ................................. 150c esd protection on all pins (hbm:mm) .......(4 kv:400v) latch-up current at each pin ........................ 200 ma ?notice: stresses above those listed under maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this s pecification is not implied. exposure to maximum rating conditions for extended periods may affect device reliability. dc characteristics electrical specifications: unless otherwise indicated, v dd = 2.7v to 5.5v, gnd = ground, and t a = -55c to +125c. parameters sym min typ max unit conditions power supply operating voltage range v dd 2.7 5.5 v operating current i dd 200 400 a continuous operation shutdown current i shdn 0.1 1 a shutdown mode power-on-reset threshold (por) v por 1 . 7 vv dd falling edge line regulation c/ v 0 . 2 c / vv dd = 2.7v to 5.5v temperature sensor accuracy accuracy with 12-bit resolution: t a = +25c t acy 0 . 5 cv dd = 3.3v -10c < t a ? +85c t acy -1.0 +1.0 c v dd = 3.3v -10c < t a ? +125c t acy -2.0 +2.0 c v dd = 3.3v -55c < t a ? +125c t acy -3.0 +3.0 c v dd = 3.3v internal ?? adc conversion time: 9-bit resolution t conv 30 75 ms 33 samples/sec (typical) 10-bit resolution t conv 60 150 ms 17 samples/sec (typical) 11-bit resolution t conv 120 300 ms 8 samples/sec (typical) 12-bit resolution t conv 240 600 ms 4 samples/sec (typical) alert output (open-drain) high-level current i oh 1 av oh = 5v low-level voltage v ol 0 . 4vi ol = 3 ma thermal response response time t res 1.4 s time to 63% (89c) 27c (air) to 125c (oil bath) downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 4 ? 2010 microchip technology inc. graphical symbol description digital input/output pin characteristics electrical specifications: unless otherwise indicated, v dd = 2.7v to 5.5v, gnd = ground and t a = -55c to +125c. parameters sym min typ max units conditions serial input/output (sclk, sda, a0, a1, a2) input high-level voltage v ih 0.7 v dd v low-level voltage v il 0 . 3 v dd v input current i in -1 +1 a output (sda) low-level voltage v ol 0 . 4vi ol = 3 ma high-level current i oh 1 av oh = 5v low-level current i ol 6m a v ol = 0.6v capacitance c in 1 0p f sda and sclk inputs hysteresis v hyst 0.05 v dd v temperature characteristics electrical specifications: unless otherwise indicated, v dd = +2.7v to +5.5v, gnd = ground. parameters sym min typ max units conditions temperature ranges specified temperature range t a -55 +125 c ( note 1 ) operating temperature range t a -55 +125 c storage temperature range t a -65 +150 c thermal package resistances thermal resistance, 5l-sot23 ? ja 2 5 6 c / w thermal resistance, 8l-soic ? ja 1 6 3 c / w thermal resistance, 8l-msop ? ja 2 0 6 c / w note 1: operation in this range must not cause t j to exceed maximum junction temperature (+150c). v dd v ih v il i in voltage current time time v dd i oh voltage current time time input output v ol i ol downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 5 mcp9800/1/2/3 timing diagram serial interface timing specifications electrical specifications: unless otherwise indicated, v dd = 2.7v to 5.5v, gnd = ground, -55c < t a < +125c, c l = 80 pf, and all limits measured to 50% point. parameters sym min typ max units conditions 2-wire i 2 c?/smbus compatible interface serial port frequency f sc 0 400 khz i 2 c mcp9800/01 f sc 10 400 khz smbus mcp9802/03 clock period t sc 2.5 s low clock t low 1.3 s high clock t high 0.6 s rise time t r 20 300 ns 10% to 90% of v dd (sclk, sda) fall time t f 20 300 ns 90% to 10% of v dd (sclk, sda) data setup before sclk high t su-data 0.1 s data hold after sclk low t h-data 00 . 9 s start condition setup time t su-start 0.6 s start condition hold time t h-start 0.6 s stop condition setup time t su-stop 0.6 s bus idle t idle 1.3 s time out t out 25 35 50 ms mcp9802/03 only t su-start t h -start t su - d a ta t su - s to p t b-free scl sda t h-data t h i g h t low t r , t f start condition data transmission stop condition downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 6 ? 2010 microchip technology inc. notes: downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 7 mcp9800/1/2/3 2.0 typical performance curves note: unless otherwise noted: v dd = 2.7v to 5.5v. figure 2-1: average temperature accuracy vs. ambient temperature, v dd = 3.3v. figure 2-2: average temperature accuracy vs. ambient temperature. figure 2-3: average temperature accuracy vs. ambient temperature, v dd = 3.3v. figure 2-4: temperature accuracy histogram, t a = +25c. figure 2-5: supply current vs. ambient temperature. figure 2-6: shutdown current vs. ambient temperature. note: the graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. the performance characteristics listed herein are not tested or guaranteed. in some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore, outside the warranted range. -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 -55 -35 -15 5 25 45 65 85 105 125 t a (c) temperature accuracy (c) 12-bit resolution 160 samples v dd = 3.3v spec. limits -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 -55 -35 -15 5 25 45 65 85 105 125 t a (c) temperature accuracy (c) 12-bit resolution 160 samples v dd = 2.7v v dd = 3.3v v dd = 5.5v v dd = 5.0v -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 -55 -35 -15 5 25 45 65 85 105 125 t a (c) temperature accuracy (c) 11-bit 12-bit 9-bit 10-bit v dd = 3.3v 160 samples resolution 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.00.5 1.0 1.5 2.0 2.5 3.0 temperature accuracy (c) occurrences t a = +25c v dd = 3.3v 5 lots 32 samples/lot 160 samples 50 100 150 200 250 300 350 400 -55 -35 -15 5 25 45 65 85 105 125 t a (c) i dd (a) v dd = 2.7v v dd = 3.3v v dd = 5.5v v dd = 5.0v 0 0.2 0.4 0.6 0.8 1 -55 -35 -15 5 25 45 65 85 105 125 t a (c ) i shdn (a) downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 8 ? 2010 microchip technology inc. note: unless otherwise noted: v dd = 2.7v to 5.5v. figure 2-7: alert and sda i ol vs. ambient temperature. figure 2-8: alert and sda output v ol vs. ambient temperature. figure 2-9: mcp980x thermal response vs time. 6 12 18 24 30 36 42 48 -55 -35 -15 5 25 45 65 85 105 125 t a (c) alert & sda i ol (ma) v dd = 5.5v v dd = 3.3v v dd = 2.7v v ol = 0.6v 0 0.1 0.2 0.3 0.4 -55 -35 -15 5 25 45 65 85 105 125 t a (c) alert & sda v ol (v) v dd = 5.5v v dd = 3.3v v dd = 2.7v i ol = 3ma 5 25 45 65 85 105 125 145 -202468101214161820 time (s) temperature data (c) soic average of 10 samples per package 27c (air) to 125c (oil bath) msop sot-23 downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 9 mcp9800/1/2/3 3.0 pin description the descriptions of the pins are listed in tab l e 3 - 1 . table 3-1: pin function table 3.1 serial data pin (sda) the sda is a bidirectional input/output pin, used to serially transmit data to and from the host controller. this pin requires a pull-up resistor to output data. 3.2 serial clock pin (sclk) the sclk is a clock input pin. all communication and timing is relative to the signal on this pin. the clock is generated by the host controller on the bus. 3.3 power supply input (v dd ) the v dd pin is the power pin. the operating voltage, as specified in the dc electrical specification table, is applied on this pin. 3.4 ground (gnd) the gnd pin is the system ground pin. 3.5 alert output the mcp9800/1/2/3s alert pin is an open-drain output pin. the device outputs an alert signal when the ambient temperature goes beyond the user-programmed temperature limit. 3.6 address pins (a2, a1, a0) these pins are device or slave address input pins and are available only with the mcp9801/03. the device addresses for the mcp9800/02 are factory-set. the address pins are the least significant bits (lsb) of the device address bits. the most significant bits (msb) (a6, a5, a4, a3) are factory-set to < 1001 >. this is illustrated in tab l e 3 - 2 . mcp9800 mcp9802 sot-23-5 mcp9801 mcp9803 msop, soic symbol function 5 1 sda bidirectional serial data 4 2 sclk serial clock input 3 3 alert temperature alert output 2 4 gnd ground 5 a2 address select pin (bit 2) 6 a1 address select pin (bit 1) 7 a0 address select pin (bit 0) 18v dd power supply input table 3-2: slave address device a6 a5 a4 a3 a2 a1 a0 mcp9800/02a0 1001000 mcp9800/02a1 1001001 mcp9800/02a2 1001010 mcp9800/02a3 1001011 mcp9800/02a4 1001100 mcp9800/02a5 1001101 mcp9800/02a6 1001110 mcp9800/02a7 1001111 mcp9801/03 1001xxx note: user-selectable address is shown by x. downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 10 ? 2010 microchip technology inc. notes: downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 11 mcp9800/1/2/3 4.0 serial communication 4.1 2-wire smbus/standard mode i 2 c? protocol-compatible interface the mcp9800/1/2/3 serial clock input (scl) and the bidirectional serial data line (sda) form a 2-wire bidirectional smbus/standard mode i 2 c compatible communication port (refer to the digital input/output pin characteristics table and serial interface timing specifications table ). the following bus protocol has been defined: table 4-1: mcp9800 serial bus protocol descriptions 4.1.1 data transfer data transfers are initiated by a start condition (start), followed by a 7-bit device address and a read/write bit. an acknowledge (ack) from the slave confirms the reception of each byte. each access must be terminated by a stop condition (stop). repeated communication is initiated after t b-free . this device does not support sequential register read/ write. each register needs to be addressed using the register pointer. this device supports the receive protocol. the register can be specified using the pointer for the initial read. each repeated read or receive begins with a start condition and address byte. the mcp9800/1/2/3 retains the previously selected register. therefore, it outputs data from the previously-specified register (repeated pointer specification is not necessary). 4.1.2 master/slave the bus is controlled by a master device (typically a microcontroller) that controls the bus access and generates the start and stop conditions. the mcp9800/1/2/3 is a slave device and does not control other devices in the bus. both master and slave devices can operate as either transmitter or receiver. however, the master device determines which mode is activated. 4.1.3 start/stop condition a high-to-low transition of the sda line (while scl is high) is the start condition. all data transfers must be preceded by a start condition from the master. if a start condition is generated during data transfer, the mcp9800/1/2/3 resets and accepts the new start condition. a low-to-high transition of the sda line (while scl is high) signifies a stop condition. if a stop condition is introduced during data transmission, the mcp9800/1/ 2/3 releases the bus. all data transfers are ended by a stop condition from the master. 4.1.4 address byte following the start condition, the host must transmit an 8-bit address byte to the mcp9800/1/2/3. the address for the mcp9800 temperature sensor is 1001,a2,a1,a0 in binary, where the a2, a1 and a0 bits are set externally by connecting the corresponding pins to v dd 1 or gnd 0 . the 7-bit address transmitted in the serial bit stream must match the selected address for the mcp9800/1/2/3 to respond with an ack. bit 8 in the address byte is a read/write bit. setting this bit to 1 commands a read operation, while 0 commands a write operation (see figure 4-1 ). term description master the device that controls the serial bus, typically a microcontroller. slave the device addressed by the master, such as the mcp9800/1/2/3. transmitter device sending data to the bus. receiver device receiving data from the bus. start a unique signal from master to initiate serial interface with a slave. stop a unique signal from the master to terminate serial interface from a slave. read/write a read or write to the mcp9800/1/2/3 registers. ack a receiver acknowledges (ack) the reception of each byte by polling the bus. nak a receiver not-acknowledges (nak) or releases the bus to show end-of-data (eod). busy communication is not possible because the bus is in use. not busy the bus is in the idle state, both sda and scl remain high. data valid sda must remain stable before scl becomes high in order for a data bit to be considered valid. during normal data transfers, sda only changes state while scl is low. downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 12 ? 2010 microchip technology inc. figure 4-1: device addressing. 4.1.5 data valid after the start condition, each bit of data in transmission needs to be settled for a time specified by t su-data before scl toggles from low-to-high (see serial interface timing specifications on page 5 ). 4.1.6 acknowledge (ack) each receiving device, when addressed, is obliged to generate an ack bit after the reception of each byte. the master device must generate an extra clock pulse for ack to be recognized. the acknowledging device pulls down the sda line for t su-data before the low-to-high transition of scl from the master. sda also needs to remain pulled down for t h-data after a high-to-low transition of scl. during read, the master must signal an end-of-data (eod) to the slave by not generating an ack bit (nak) once the last bit has been clocked out of the slave. in this case, the slave will leave the data line released to enable the master to generate the stop condition. 123456789 scl sda 10 01 a2 a1 a0 start address byte slave address r/w pic18fxxxx response code address ac k downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 13 mcp9800/1/2/3 5.0 functional description the mcp9800/1/2/3 temperature sensor consists of a band-gap type temperature sensor, a ?? analog-to- digital converter (adc), user-programmable registers and a 2-wire i 2 c protocol-compatible serial interface. figure 5-1: functional block diagram. 5.1 temperature sensor the mcp9800/1/2/3 uses the difference in the base- emitter voltage of a transistor while its collector current is changed from ic 1 to ic 2 . with this method, the ? v be depends only on the ratio of the two currents and the ambient temperature, as shown in equation 5-1 . equation 5-1: 5.2 ?? analog-to-digital converter a sigma-delta adc is used to convert ? v be to a digital word that corresponds to the transistor temperature. the converter has an adjustable resolution from 0.5c (at 30 ms conversion time) to 0.0625c (at 240 ms conversion time). thus, it allows the user to make trade-offs between resolution and conversion time. refer to section 5.3.2 sensor configuration register (config) and section 5.3.4.7 ?? adc resolution for details. resolution 0.5c 0.25c 0.125c 0.0625c temperature t hyst t set register register register register pointer i 2 c? interface configuration register ?? adc band-gap temperature sensor one-shot shutdown fault queue alert polarity alert comp/int ? v be kt q ----- - ?? ?? ln ic 1 ic 2 ? ?? ? = where: t = temperature in kelvin ? v be = change in diode base-emitter voltage k = boltzmann's constant q = electron charge ic 1 and ic 2 = currents with n:1 ratio downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 14 ? 2010 microchip technology inc. 5.3 registers the mcp9800/1/2/3 has four registers that are user-accessible. these registers are specified as the ambient temperature (t a ) register, the temperature limit-set (t set ) register, the temperature hysteresis (t hyst ) register and device configuration (config) register. the ambient temperature register is a read-only register and is used to access the ambient temperature data. the data from the adc is loaded in parallel in the register. the temperature limit-set and temperature hysteresis registers are read/write registers that provide user-programmable temperature limits. if the ambient temperature drifts beyond the programmed limits, the mcp9800/1/2/3 outputs an alert signal using the alert pin (refer to section 5.3.4.3 alert output configuration ). the device configuration register provides access for the user to configure the mcp9800/1/2/3s various features. these registers are described in further detail in the following sections. the registers are accessed by sending register point- ers to the mcp9800/1/2/3 using the serial interface. this is an 8-bit pointer. however, the two least significant bits (lsbs) are used as pointers and all other bits need to be cleared < 0 >. this device has addi- tional registers that are reserved for test and calibration. if these registers are accessed, the device may not perform according to the specification. the pointer description is shown below. figure 5-2: register block diagram. alert output control logic alert output resolution temperature t hyst t set register register register configuration register one-shot shutdown fault queue alert polarity alert comp/int register 5-1: register pointer u-0 u-0 u-0 u-0 u-0 u-0 r/w-0 r/w-0 000000p 1p 0 bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 7-2 unimplemented: read as 0 bit 1-0 px<1:0>: pointer bits 00 = temperature register (t a ) 01 = configuration register (config) 10 = temperature hysteresis register (t hyst ) 11 = temperature limit-set register (t set ) . downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 15 mcp9800/1/2/3 table 5-1: bit assignment summary for all registers register pointer p1 p0 msb/ lsb bit assignment 76 5 43210 ambient temperature register (t a ) 0 0 msb sign 2 6 c 2 5 c 2 4 c 2 3 c 2 2 c 2 1 c 2 0 c lsb 2 -1 c 2 -2 c 2 -3 c 2 -4 c 0 000 sensor configuration register (config) 0 1 lsb one-shot resolution fault queue alert polarity comp/int shutdown temperature hysteresis register (t hyst ) 1 0 msb sign 2 6 c 2 5 c 2 4 c 2 3 c 2 2 c 2 1 c 2 0 c lsb 2 -1 c 0 0 0 0 0 0 0 temperature limit-set register (t set ) 1 1 msb sign 2 6 c 2 5 c 2 4 c 2 3 c 2 2 c 2 1 c 2 0 c lsb 2 -1 c 0 0 0 0 0 0 0 downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 16 ? 2010 microchip technology inc. 5.3.1 ambient temperature register (t a ) the mcp9800/1/2/3 has a 16-bit read-only ambient temperature register that contains 9-bit to 12-bit temperature data. (0.5c to 0.0625c resolutions, respectively). this data is formatted in twos complement. the bit assignments, as well as the corresponding resolution, is shown in the register assignment below. the refresh rate of this register depends on the selected adc resolution. it takes 30 ms (typical) for 9-bit data and 240 ms (typical) for 12-bit data. since this register is double-buffered, the user can read the register while the mcp9800/1/2/3 performs analog-to-digital conversion in the background. the decimal code to ambient temperature conversion is shown in equation 5-2 : equation 5-2: t a code 2 4 C ? = where: t a = ambient temperature (c) code = mcp9800 output in decimal register 5-2: ambient temperature register (t a ) C address < 0000 0000 >b upper half: r-0 r-0 r-0 r-0 r-0 r-0 r-0 r-0 sign 2 6 c 2 5 c 2 4 c 2 3 c 2 2 c 2 1 c 2 0 c bit 15 bit 8 lower half: r-0 r-0 r-0 r-0 r-0 r-0 r-0 r-0 2 -1 c/bit 2 -2 c 2 -3 c 2 -4 c 0 0 0 0 bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown note 1: when the 0.5c, 0.25c or 0.125c resolutions are selected, bit 6, bit 7 or bit 8 will remain clear < 0 >, respectively. downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 17 mcp9800/1/2/3 figure 5-3: timing diagram for reading +25.25c temperature from the t a register (see section 5.3.1 ambient temperature register (t a ) ). sda ac k 1001 a t a pointer 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte ac k 1001 a msb data ac k na k s p 2 a 1 a 0 12345678 12345678 12345678 address byte lsb data r pic18fxxx pic18fxxx pic18fxxx master master w sda scl 000 00011 001 01000 000 note: it is not necessary to select the register pointer if it was set from the previous read/ write. (see section 4.1.1 ) downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 18 ? 2010 microchip technology inc. 5.3.2 sensor configuration register (config) the mcp9800/1/2/3 has an 8-bit read/write configuration register that allows the user to select the different features. these features include shutdown, alert output select as comparator or interrupt output, alert output polarity, fault queue cycle, temperature measurement resolution and one-shot mode (single conversion while in shutdown). these functions are described in detail in the following sections. register 5-3: config uration register (config) C address < 0000 0001 >b r/w-0 r/w-0 r/w-0 r/w-0 r/w-0 r/w-0 r/w-0 r/w-0 one-shot resolution fault queue alert polarity comp/int shutdown bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown bit 7 one-shot bit 1 = enabled 0 = disabled (power-up default) bit 5-6 ?? adc resolution bits 00 = 9 bit or 0.5c (power-up default) 01 = 10 bit or 0.25c 10 = 11 bit or 0.125c 11 = 12 bit or 0.0625c bit 3-4 fault queue bits 00 = 1 (power-up default) 01 =2 10 =4 11 =6 bit 2 alert polarity bit 1 = active-high 0 = active-low (power-up default) bit 1 comp/int bit 1 = interrupt mode 0 = comparator mode (power-up default) bit 0 shutdown bit 1 = enable 0 = disable (power-up default) downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 19 mcp9800/1/2/3 figure 5-4: timing diagram for writing and reading from the configuration register (see section 5.3.2 sensor configuration register (config) ). sda ac k 1001 a config pointer 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte ac k 1001 a data na k s p 2 a 1 a 0 12345678 12345678 address byte r pic18fxxx pic18fxxx pic18fxxx w sda scl 001 01100 000 reading the config register. writing to the config register to change the resolution to 0.0625c <0110 0000>b. sda ac k 1001 a 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte w pic18fxxx pic18fxxx msb data ac k p 12345678 1 config pointer pic18fxxx 001 01100 000 note: it is not necessary to select the register pointer if it was set from the previous read/ write (see section 4.1.1 ). downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 20 ? 2010 microchip technology inc. 5.3.3 temperature hysteresis register (t hyst ) the mcp9800/1/2/3 has a 16-bit read/write temperature hysteresis register that contains a 9-bit data in twos compliment format. this register is used to set a hysteresis for the t set limit. therefore, the data represents a minimum temperature limit. if the ambient temperature drifts below the specified limit, the mcp9800/1/2/3 asserts an alert output (refer to section 5.3.4.3 alert output configuration ). this register uses the nine most significant bits (msbs) and all other bits are dont cares. the power-up default value of t hyst register is 75c, or <0100 1011 0>b in binary. register 5-4: temperature hysteresis register (t hyst ) C address < 0000 0010 >b upper half: r/w-0 r/w-1 r/w-0 r/w-0 r/w-1 r/w-0 r/w-1 r/w-1 sign 2 6 c 2 5 c 2 4 c 2 3 c 2 2 c 2 1 c 2 0 c bit 15 bit 8 lower half: r/w-0 r-0 r-0 r-0 r-0 r-0 r-0 r-0 2 -1 c 0 0 0 0 0 0 0 bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 21 mcp9800/1/2/3 figure 5-5: timing diagram for writing and reading from the temperature hysteresis register (see section 5.3.3 temperature hysteresis register (t hyst ) ). sda ac k 1001 a 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte ac k 1001 a msb data ac k na k s p 2 a 1 a 0 12345678 12345678 12345678 address byte lsb data r pic18fxxx pic18fxxx pic18fxxx master master w sda scl 010 01011 111 00000 000 reading the t hyst register. writing to the t hyst register to set the temperature hysteresis to 95c < 0101 1111 0000 0000 >b . sda ac k 1001 a 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte w pic18fxxx pic18fxxx msb data ac k ac k p 12345678 12345678 lsb data t hyst pointer pic18fxxx pic18fxx 010 01011 111 00000 000 note: it is not necessary to select the register pointer if it was set from the previous read/ write (see section 4.1.1 ). t hyst pointer downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 22 ? 2010 microchip technology inc. 5.3.4 temperature limit-set register (t set ) the mcp9800/1/2/3 has a 16-bit read/write temperature limit-set register (t set ) which contains a 9-bit data in twos compliment format. this data represents a maximum temperature limit. if the ambient temperature exceeds this specified limit, the mcp9800/1/2/3 asserts an alert output. (refer to section 5.3.4.3 alert output configuration ). this register uses the nine most significant bits (msbs) and all other bits are dont cares. the power-up default value of the t set register is 80c, or <0101 0000 0>b in binary. register 5-5: temperature limit-set register (t set ) C address < 0000 0011 >b upper half: r/w-0 r/w-1 r/w-0 r/w-1 r/w-0 r/w-0 r/w-0 r/w-0 sign 2 6 c 2 5 c 2 4 c 2 3 c 2 2 c 2 1 c 2 0 c bit 15 bit 8 lower half: r/w-0 r-0 r-0 r-0 r-0 r-0 r-0 r-0 2 -1 c 0 0 0 0 0 0 0 bit 7 bit 0 legend: r = readable bit w = writable bit u = unimplemented bit, read as 0 -n = value at por 1 = bit is set 0 = bit is cleared x = bit is unknown downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 23 mcp9800/1/2/3 figure 5-6: timing diagram for writing and reading from the temperature limit-set register (see section 5.3.4 temperature limit-set register (t set ) ). sda ac k 1001 a t set pointer 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte ac k 1001 a msb data ac k na k s p 2 a 1 a 0 12345678 12345678 12345678 address byte lsb data r pic18fxxx pic18fxxx pic18fxxx master master w sda scl 011 01011 010 00000 000 reading the t set register. writing to the t set register to set the temperature limit to 90c, < 0101 1010 0000 0000 >b sda ac k 1001 a 0000 ac k s 2 a 1 a 0 12345678 12345678 scl 0 address byte w pic18fxxx pic18fxxx msb data ac k ac k p 12345678 12345678 lsb data t set pointer pic18fxxx pic18fxx 011 01011 010 00000 000 note: it is not necessary to select the register pointer if it was set from the previous read/ write. (see section 4.1.1 ) downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 24 ? 2010 microchip technology inc. 5.3.4.1 shutdown mode the shutdown mode disables all power-consuming activities (including temperature sampling operations) while leaving the serial interface active. the device consumes 2 a (maximum) in this mode. it remains in this mode until the configuration register is updated to enable continuous conversion or until power is recycled. in shutdown mode, the config, t a , t set and t hyst registers can be read or written to; however, the serial bus activity will increase the shutdown current. 5.3.4.2 one-shot mode the mcp9800/1/2/3 can also be used in a one-shot mode that can be selected using bit 7 of the config register. the one-shot mode performs a single temperature measurement and returns to shutdown mode. this mode is especially useful for low-power applications where temperature is measured upon command from a controller. for example, a 9-bit t a in one-shot mode consumes 200 a (typical) for 30 ms and 0.1 a (typical) during shutdown. to access this feature, the device needs to initially be in shutdown mode. this is done by sending a byte to the config register with bit 0 set < 1 > and bit 7 cleared < 0 >. once the device is in shutdown mode, the config register needs to be written to again, with bit 0 and bit 7 set < 1 >. this begins the single conversion cycle of t conv , 30ms for 9-bit data. once the conversion is completed, t a is updated and bit 7 of config becomes cleared < 0 > by the mcp9800/1/2/3. table 5-2: shutdown and one-shot mode description 5.3.4.3 alert output configuration the alert output can be configured as either a comparator output or as interrupt output mode using bit 1 of config. the polarity can also be specified as an active-high or active-low using bit 2 of config. the following sections describe each output mode, while figure 5-7 gives a graphical description. 5.3.4.4 comparator mode in comparator mode, the alert output is asserted when t a is greater than t set . the pin remains active until t a is lower than t hyst . the comparator mode is useful for thermostat-type applications, such as turning on a cooling fan or triggering a system shutdown when the temperature exceeds a safe operating range. in comparator mode, if the device enters the shutdown mode with asserted alert output, the output remains active during shutdown. the device must be operating in continuous conversion, with t a below t hyst , for the alert output to be deasserted. 5.3.4.5 interrupt mode in interrupt mode, the alert output is asserted when t a is greater than t set . however, the output is deasserted when the user performs a read from any register. this mode is designed for interrupt-driven, microcontroller-based systems. the microcontroller receiving the interrupt will have to acknowledge the interrupt by reading any register from the mcp9800/1/ 2/3. this will clear the interrupt and the alert pin will become deasserted. when t a drifts below t hyst , the mcp9800/1/2/3 outputs another interrupt and the controller needs to read a register to deassert the alert output. shutting down the device will also reset, or deassert, the alert output. figure 5-7: alert output. operational mode one-shot (bit 7) shutdown (bit 0) continuous conversion 00 shutdown 01 continuous conversion (one-shot is ignored) 10 one-shot ( note 1 ) 11 note 1: the shutdown command < 01 > needs to be programmed before sending a one-shot command < 11 >. t set t hyst alert alert comparator mode interrupt mode active-low active-low t a register read * see section 5.3.4.5 interrupt mode * downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 25 mcp9800/1/2/3 5.3.4.6 fault queue the fault queue feature can be used as a filter to lessen the probability of spurious activation of the alert pin. t a must remain above t set for the consecutive number of conversion cycles selected using the fault queue bits. bit 3 and bit 4 of config can be used to select up to six fault queue cycles. for example, if six fault queues are selected, t a must be greater than t set for six consecutive conversions before alert is asserted as a comparator or an interrupt output. this queue setting also applies for t hyst . i f six fault queues are selected, t a must remain below t hyst for six consecutive conversions before alert is deasserted (comparator mode) or before another interrupt is asserted (interrupt mode). 5.3.4.7 ?? adc resolution the mcp9800/1/2/3 provides access to select the adc resolution from 9-bit to 12-bit (0.5c to 0.0625c resolution) using bit 6 and bit 5 of the config register. the user can gain better insight into the trends and characteristics of the ambient temperature by using a finer resolution. increasing the resolution also reduces the quantization error. figure 2-3 shows accuracy versus resolution. table 5-3 shows the t a register conversion time for the corresponding resolution. table 5-3: resolution and conversion time 5.4 summary of power-up condition the mcp9800/1/2/3 has an internal power-on reset (por) circuit. if the power supply voltage v dd glitches down to the 1.7v (typical) threshold, the device resets the registers to the power-up default settings. table 5-4 shows the power-up default summary. table 5-4: power-up defaults at power-up, the mcp9800/1/2/3 has an inherent 2 ms (typical) power-up delay before updating the registers with default values and start a conversion cycle. this delay reduces register corruption due to unsettled power. after power-up, it takes t conv for the tcn75a to update the t a register with valid temperature data. bits resolution t conv (typical) 90 . 5 3 0 m s 10 0.25 60 ms 11 0.125 120 ms 12 0.0625 240 ms register data (hex) power-up defaults t a 0000 0c t set a000 80c t hyst 9600 75c pointer 00 temperature register config 00 continuous conversion comparator mode active-low output fault queue 1 9-bit resolution downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 26 ? 2010 microchip technology inc. notes: downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 27 mcp9800/1/2/3 6.0 applications information 6.1 connecting to the serial bus the sda and scl serial interface are open-drain pins that require pull-up resistors. this configuration is shown in figure 6-1 . figure 6-1: pull-up resistors on serial interface. the mcp9800/1/2/3 is designed to meet 0.4v (maximum) voltage drop at 3 ma of current. this allows the mcp9800/1/2/3 to drive lower values of pull-up resistors and higher bus capacitance. in this application, all devices on the bus must meet the same pull-down current requirements. 6.2 typical application microchip provides several microcontroller product lines with master synchronous serial port modules (mssp) that include the i 2 c interface mode. this module implements all master and slave functions and simplifies the firmware development overhead. figure 6-2 shows a typical application using the pic16f737 as a master to control other microchip slave products, such as eeprom, fan speed controllers and the mcp9800 temperature sensor connected to the bus. figure 6-2: multiple devices on i 2 c? bus. the alert output can be wired with a number of other open-drain devices. in such applications, the output needs to be programmed as an active-low output. most systems will require pull-up resistors for this configuration. 6.3 layout considerations the mcp9800/1/2/3 does not require any additional components besides the master controller in order to measure temperature. however, it is recommended that a decoupling capacitor of 0.1 f to 1 f be used between the v dd and gnd pins. a high-frequency ceramic capacitor is recommended. it is necessary for the capacitor to be located as close as possible to the power pins in order to provide effective noise protection. for applications where a switching regulator is used to power the sensor, it is recommended to add a 200 ? resistor in series to v dd to filter out the switcher noise from the sensor. it is also recommended to add the series resistor in applications where a linear regulator is used to step-down a switching regulator voltage to power the sensor. for example, if a linearly regulated 3.3v from a 5v switching regulator is used to power the sensor, add a 200 ? series resistor (refer to figure 6-3 ). figure 6-3: power-supply filter using a single resistor. 6.4 thermal considerations the mcp9800/1/2/3 measures temperature by monitoring the voltage of a diode located in the die. a low-impedance thermal path between the die and the printed circuit board (pcb) is provided by the pins. therefore, the mcp9800/1/2/3 effectively monitors the temperature of the pcb. however, the thermal path for the ambient air is not as efficient because the plastic device package functions as a thermal insulator. a potential for self-heating errors can exist if the mcp9800/1/2/3 sda and scl communication lines are heavily loaded with pull-ups. typically, the self-heating error is negligible because of the relatively small current consumption of the mcp9800/1/2/3. however, in order to maximize the temperature accuracy, the sda and scl pins need to be lightly loaded. pic ? sdascl v dd r r mcu mcp9800/1/2/3 sda scl pic16f737 microcontroller temperature sensor 24lc01 eeprom tc654 fan speed controller tcn75a v dd 200 ? mcp9800/1/2/3 switching regulator 0.1 f bypass v dd 200 ? mcp9800/1/2/3 switching regulator 0.1 f bypass regulator linear downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 28 ? 2010 microchip technology inc. notes: downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 29 mcp9800/1/2/3 7.0 packaging information 7.1 package marking information 5-lead sot-23 xxnn 8-lead soic (150 mil) example: xxxxxxxx xxxxyyww nnn mcp9803 sn1044 256 8-lead msop example: xxxxx ywwnnn 9803m 044256 example: part number mcp9800 part number mcp9802 mcp9800a0t-m/ot ldnn mcp9802a0t-m/ot jknn mcp9800a1t-m/ot lenn mcp9802a1t-m/ot jlnn mcp9800a2t-m/ot lfnn mcp9802a2t-m/ot jmnn mcp9800a3t-m/ot lgnn mcp9802a3t-m/ot jpnn mcp9800a4t-m/ot lhnn mcp9802a4t-m/ot jqnn mcp9800a5t-m/ot ljnn mcp9802a5t-m/ot jrnn mcp9800a6t-m/ot lknn mcp9802a6t-m/ot jsnn mcp9800a7t-m/ot llnn mcp9802a7t-m/ot jtnn legend: xx...x customer-specific information y year code (last digit of calendar year) yy year code (last 2 digits of calendar year) ww week code (week of january 1 is week 01) nnn alphanumeric traceability code pb-free jedec designator for matte tin (sn) * this package is pb-free. the pb-free jedec designator ( ) can be found on the outer packaging for this package. note : in the event the full microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 3 e 3 e downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 30 ? 2010 microchip technology inc. n b e e1 d 1 2 3 e e1 a a1 a2 c l l1 downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 31 mcp9800/1/2/3 noe: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 32 ? 2010 microchip technology inc. d n e e1 note 1 1 2 e b a a1 a2 c l1 l downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 33 mcp9800/1/2/3 noe: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 34 ? 2010 microchip technology inc. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 35 mcp9800/1/2/3 note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 36 ? 2010 microchip technology inc. downloaded from: http:///
? 2010 microchip technology inc. ds21906d-page 37 mcp9800/1/2/3 appendix a: revision history revision d (november 2010) the following is the list of modifications: 1. updated tab l e 3 - 2 to include all available i 2 c address options for the mcp9800/02. 2. added more package markings examples to the table in section 7.1 package marking information . 3. updated the product identification system section. revision c (september 2010) the following is the list of modifications: 1. updated section 6.3 layout considerations . 2. updated package markings drawings. 3. removed lead free designation letter g from section 7.0 packaging information and from the product identification system page. all devices are lead free. 4. added appendix a: revision history revision b (may 2008) the following is the list of modifications: 1. added lead free designation letter g in section 7.0 packaging information and in the product identification system page. revision a (october 2004) original release of this document. downloaded from: http:///
mcp9800/1/2/3 ds21906d-page 38 ? 2010 microchip technology inc. notes: downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 39 mcp9800/1/2/3 product identification system to order or obtain information, e. g., on pricing or delivery, refer to the factory or the listed sales office . part no. Cx /xx package temperature range device device: mcp9800: temperature sensor mcp9801: temperature sensor mcp9802: temperature sensor mcp9803: temperature sensor a0 = slave address set to 000 a1 = slave address set to 001 a2 = slave address set to 010 a3 = slave address set to 011 a4 = slave address set to 100 a5 = slave address set to 101 a6 = slave address set to 110 a7 = slave address set to 111 tape and reel: = blank t = tape and reel temperature range: m = -55 ? c to +125 ? c package: ot = plastic small outline transistor (sot-23), 5-lead ms = plastic micro small outline (msop), 8-lead sn = plastic soic, (150 mil body), 8-lead examples: a) mcp9800a0t-m/ot slave address 000 , tape and reel, -55 ? c to +125 ? c, sot-23 package. b) mcp9800a5t-m/ot slave address 101 , tape and reel, -55 ? c to +125 ? c, sot-23 package. a) mcp9801-m/ms -55 ? c to +125 ? c, 8ld msop package. b) mcp9801t-m/ms tape and reel, -55 ? c to +125 ? c, 8ld msop package. c) mcp9801-m/sn -55 ? c to +125 ? c, 8ld soic package. d) mcp9801t-m/sn tape and reel, -55 ? c to +125 ? c, 8ld soic package. a) mcp9802a0t-m/ot slave address 000 , tape and reel, -55 ? c to +125 ? c, sot-23 package. b) mcp9802a5t-m/ot slave address 101 , tape and reel, -55 ? c to +125 ? c, sot-23 package. a) mcp9803-m/ms -55 ? c to +125 ? c, 8ld msop package. b) mcp9803t-m/ms tape and reel, -55 ? c to +125 ? c, 8ld msop package. c) mcp9803-m/sn -55 ? c to +125 ? c, 8ld soic package. d) mcp9803t-m/sn tape and reel, -55 ? c to +125 ? c, 8ld soic package. xx slave address x tape & reel downloaded from: http:///
mcp9800/1/2/3 ds21909d-page 40 ? 2010 microchip technology inc. notes: downloaded from: http:///
? 2010 microchip technology inc. ds21909d-page 41 information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safety applications is entirely at the buyers risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, implicitly or otherwise, under any microchip intellectual property rights. trademarks the microchip name and logo, the microchip logo, dspic, k ee l oq , k ee l oq logo, mplab, pic, picmicro, picstart, pic 32 logo, rfpic and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. filterlab, hampshire, hi-tech c, linear active thermistor, mxdev, mxlab, seeval and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. analog-for-the-digital age, appl ication maestro, codeguard, dspicdem, dspicdem.net, dspicworks, dsspeak, ecan, economonitor, fansense, hi-tide, in-circuit serial programming, icsp, mindi, miwi, mpasm, mplab certified logo, mplib, mplink, mtouch, omniscient code generation, picc, picc-18, picdem, picdem.net, pickit, pictail, real ice, rflab, select mode, total endurance, tsharc, uniwindriver, wiperlock and zena are trademarks of microchip tec hnology incorporated in the u.s.a. and other countries. sqtp is a service mark of microchip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2010, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. isbn: 978-1-60932-662-3 note the following details of the code protection feature on microchip devices: microchip products meet the specification cont ained in their particular microchip data sheet. microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specif ications contained in microchips data sheets. most likely, the person doing so is engaged in theft of intellectual property. microchip is willing to work with the customer who is concerned about the integrity of their code. neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as unbreakable. code protection is constantly evolving. we at microchip are co mmitted to continuously improvin g the code protection features of our products. attempts to break microchips code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the companys quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory an d analog products. in addition, microchips quality system for the design and manufacture of development systems is iso 9001:2000 certified. downloaded from: http:///
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