 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| STC3100 Battery monitor IC with Coulomb counter/gas gauge Features Battery voltage monitoring Internal temperature sensor Coulomb counter with 12/14-bit AD converter, +/- 80 mV input voltage range Internal or external 32768 Hz time base I2C interface for gas gauge monitoring and device control 32-RAM bytes 8-byte unique device ID One general-purpose I/O DFN8 3x3 (Plastic micropackage) MiniSO-8 (Plastic micropackage) Applications Cellular phones, PDA, MP3 players, cordless phones Digital cameras, USB appliances, Bluetooth devices IO0 ROSC SDA SCL Pin connections (top view) Description The STC3100 monitors the critical parameters of a single-cell Li-Ion battery (voltage, temperature and current) and includes hardware functions to implement a gas gauge for battery charge monitoring, based on a programmable 12- to 14-bit A/D converter. With a typical 30 milliOhms external sense resistor, the battery current can be up to 2.5 A and the accumulator system provides a capacity up to +/-7000 mAh with a resolution of 0.2 mAh. The device is programmable through the I2C interface. 1 2 3 4 8 7 6 5 VIN VCC CG GND January 2009 Rev 1 1/21 www.st.com 21 Block diagram STC3100 1 Block diagram Figure 1. STC3100 internal block diagram VCC 1.2 V reference 32 kHz time base Oscillator ROSC AD converter 11 bits (unsigned) Accumulators and control registers AD converter 12 / 14 bits (signed) Temp sensor MUX VIN CG+ CG CG- General-purpose I/O line SCL SDA I2C interface RAM & ID registers IO0 GND AM00830 2/21 STC3100 Pin assignment 2 Pin assignment Table 1. Pin # 1 2 3 4 5 6 7 8 STC3100 pin description Pin name IO0 ROSC SDA SCL GND CG VCC VIN Type I/OD I_AD I/OD I_D Ground I_A Supply I_A General-purpose I/O Oscillator bias resistor or external 32 kHz clock for gas gauge I2C serial data I2C serial clock Analog and digital ground Gas gauge current sense input Power supply Battery voltage sense input Function Note: I: input O: output OD: open drain A: analog D: digital 3/21 Absolute maximum ratings and operating conditions STC3100 3 Absolute maximum ratings and operating conditions Table 2. Symbol Vmax Vio Tstg Tj ESD Absolute maximum ratings Parameter Maximum voltage on any pin Voltage on I/O pins Storage temperature Maximum junction temperature Electrostatic discharge (HBM human body model) Value 7 -0.3 to 7 -55 to 150 150 2 Unit V V C C kV Table 3. Symbol Vcc Vin Vmin Toper Operating conditions Parameter Operating supply voltage on VCC Input voltage on Vin Minimum voltage on VCC for RAM content retention Operating free air temperature range Value 2.7 to 5.5 0 to Vcc 2.0 -40 to 85 Unit V V V C 4/21 STC3100 Electrical characteristics 4 Table 4. Symbol Supply ICC Istby Ipdn UVLOth UVLOhyst POR Electrical characteristics Electrical characteristics (2.7 V < VCC < 4.5 V, -20 C to 70 C) Parameter Conditions Min Typ Max Units Operating current consumption Current consumption in standby Current consumption in power down Undervoltage threshold Undervoltage threshold hysteresis Power-on reset threshold Average value over 4s standby mode, inputs=0V VCC < UVLOth, inputs=0V (VCC decreasing) 2.5 2.6 100 (VCC decreasing) 2.0 100 2 1 2.7 uA uA uA V mV V Gas gauge A/D converter Vin_gg Iin ADC_res Input voltage range Input current for CG pin AD converter granularity 12 bits 13 bits 14 bits CG = 0V 12 bits 13 bits 14 bits 12 bits 13 bits 14 bits 25 C over temperature range Rosc = 200 k 0.1% , 25 C, VCC = 3.6 V over temperature and voltage ranges 30 11.77 =Cur_res*2^12*0.5/3600 Using internal time base Using external time base 6.70 3.5 1 32768 2 2.5 70 -2 -2 -3 125 250 500 0.5 1 47.08 23.54 11.77 2 2 3 -80 +80 500 mV nA uV uV uV LSB LSB LSB ms ms ms % % Hz % % kHz uV uV.h % % ADC_offset AD converter offset ADC_time AD conversion time (32768Hz clock) ADC_acc Fosc Osc_acc Fosc_ext Cur_res Chg_res Global_ CG_acc AD converter gain accuracy at full scale Internal time base frequency Internal time base accuracy External time base frequency range Current register LSB value Charge register LSB value (32,768 Hz clock) Gas gauge accuracy (not including the external sense resistor tolerance) 5/21 Electrical characteristics Table 4. Symbol STC3100 Electrical characteristics (2.7 V < VCC < 4.5 V, -20 C to 70 C) (continued) Parameter Conditions Min Typ Max Units Battery voltage and temperature a/d converter Vin_adc LSB ADC_time Volt_acc Temp_acc Input voltage range LSB value AD conversion time (32,768 Hz clock) Battery voltage measurement accuracy 2.7 V 6/21 STC3100 Typical performance curves 5 Figure 2. 1.6 1.4 1.2 Typical performance curves Standby current vs. temperature Figure 3. Current measurement accuracy vs. temperature Vgg=80mV 0.4 0.2 0.0 -0.2 -0.4 -0.6 -50 0.6 Vcc=4.5V 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 100 125 ADC_acc (%) Istby (uA) 1.0 -25 0 25 50 75 100 125 Temp (C) Temp (C) Figure 4. 2.0 1.5 Oscillator frequency accuracy vs. temperature Figure 5. Voltage measurement accuracy vs. temperature Vin=3.5V 0.6 0.4 1.0 Osc_acc (%) 0.5 0.0 -0.5 -1.0 -0.4 Volt_acc (%) 0.2 0.0 -0.2 -1.5 -2.0 -50 -0.6 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 Temp (C) Temp (C) 7/21 Application information STC3100 6 Application information Figure 6. Example of an application schematic using the STC3100 Optional filter Rosc ROSC IO voltage STC3100 SCL SDA CG Rcg VCC C1 R1 C2 VIN GND IO0 AM00831 Table 5. Name Rcg Rosc C1 C2 R1 External components list Value 10 to 50 m 200 k 1 F 220 nF 1 k Tolerance 1% 0.1% Comments Gas gauge sense resistor Internal oscillator bias resistor Supply decoupling capacitor Battery voltage input filter (optional) Battery voltage input filter (optional) 8/21 STC3100 Functional description 7 7.1 Functional description Gas gauge The gas gauge is used to monitor the available battery capacity. The voltage drop across the external sense resistor is integrated during a conversion period and input to a 12- to 14-bit AD converter. The output conversion is accumulated into a 28-bit accumulator. The system controller can control the gas gauge and read the data (upper 16 bits of the accumulator) through the I2C control registers. The AD converter output is in two's complement format. When a conversion cycle is completed, the result is added to the charge accumulator and the number of conversions is incremented in a 16-bit counter. Figure 7. Gas gauge block diagram 16-bit counter 16 Counter register 16 Current register 16 28 Charge register 28-bit accumulator CG GND 16 28 12/14-bit AD converter EOC cg_rst 2 cg_res cg_clock cg_enable rd_req Control logic cg_calibration 32768 Hz Control registers AM00832 The controller can read the value of the most recent conversion in two's complement format by reading the REG_CURRENT registers. These registers are updated at the end of each conversion. The differential inputs are scaled to the full range of the AD converter, introducing a small offset error. A high value written to the CG_CAL bit of the control register connects the inputs of the AD converter together, allowing the controller to measure the digital offset error. Using this measurement, one can calibrate the gas gauge and reduce errors due to the internal offset error. 9/21 Functional description STC3100 The conversion cycle for n bit resolution is 2n clock cycles. Using the 32,768 Hz internal clock, the conversion cycle time is 125 to 500 ms for a 12- to 14-bit resolution. The LSB value is set by the internal gain and internal reference and is 11.77 uV at maximum resolutions. When using an external 30 milliOhms sense resistor, the 28-bit accumulator results in a capacity of approximately +/- 7300 mA.h. The upper 16 bits of the accumulator can be read from the I2C interface, giving a resolution of 0.2 mA.h. When the battery voltage falls below the under voltage lockout threshold at 2.7 V, the gas gauge system is stopped and the STC3100 stays in standby mode with minimum quiescent current. All registers are maintained down to 2.0 V. Below 2.0 V, the registers are reset to their default power-on value. The gas gauge system needs an accurate 32,768 Hz timebase to compute the level of charge flowing from/to the battery. The STC3100 can operate from an internal oscillator, or use an external RTC signal for highest accuracy. 7.2 Battery voltage and temperature monitoring The battery voltage and chip temperature (close to the battery temperature) are measured by means of an A/D converter and a multiplexer. This function takes place concurrently to the gas gauge function with a dedicated A/D converter, which means that it does not affect the performance of the gas gauge. To reduce the power consumption, a conversion takes place only every two seconds, alternatively for battery voltage and temperature (so each value is refreshed every four seconds). The conversion cycle takes 213 = 8192 clock cycles. Using the 32,768 Hz internal clock, the conversion cycle time is 250 ms. The resolution is 2.44 mV for the battery voltage and 0.125 C for the temperature. 7.3 General-purpose input/output A general-purpose I/O line is available. The output is an open drain, and an external pull-up resistor may be needed in the application. Writing the IO0DATA bit to 0 forces the IO0 output low; writing the IO0DATA bit to 1 leaves the IO0 output in a high impedance state. Reading the IO0DATA bit gives the state of the IO0 pin. In standby (CG_RUN=0), reset (PORDET set to 1) and power-down (Vcc RAM registers The STC3100 provides 32 RAM registers to store any information regarding battery status, charge cycles, battery aging, proprietary informations, etc... The register content is maintained during standby and low voltage states, down to the power-on reset level of approximately 2.0 V. Below this level, the content is not preserved. This usually means that the Li-Ion cell was very deeply discharged and has been damaged. 10/21 STC3100 Functional description 7.5 Unique device ID The STC3100 provides a means to identify the battery pack or the subsystem. Each device has its own unique 8-byte ID made of an 8-bit part ID (value = 10h for the STC3100), a 48-bit random unique ID and an 8-bit CRC. The CRC-8 is calculated according to bytes REG_ID0 to REG_ID6 using the "x8 + x2 + x + 1" polynomial with a zero initial value. Since the device ID is downloaded from the ROM at power-up and is subsequently kept in read-only RAM locations together with the general-purpose RAM registers, the device ID can also be used as an indicator of the RAM integrity. 11/21 I2C interface STC3100 8 8.1 I2C interface Read and write operations The interface is used to control and read the current accumulator and registers. It is compatible with the Philips I2C registered trademark (version 2.1). It is a slave serial interface with a serial data line (SDA) and a serial clock line (SCL). SCL: input clock used to shift data. SDA: input/output bidirectional data transfers. A filter rejects the potential spikes on the bus data line to preserve data integrity. The bidirectional data line supports transfers up to 400 kbit/s (fast mode). The data is shifted to and from the chip on the SDA line, MSB first. The first bit must be high (START) followed by the device address and read/write bit control. Bits DevADDR0 to DevADDR2 are factory-programmable, the default device address value being 70h (AddrID0 = AddrID1 = AddrID2 = 0). The STC3100 then sends an acknowledge at the end of an 8-bit long sequence. The next 8 bits correspond to the register address followed by another acknowledge. The data field is the last 8-bit long sequence sent, followed by a last acknowledge. Table 6. b7 1 Device address format b6 1 b5 1 b4 0 b3 DevADDR2 b2 DevADDR1 b1 DevADDR0 b0 R/W Table 7. b7 RegADDR7 Register address format b6 RegADDR6 b5 RegADDR5 b4 RegADDR4 b3 RegADDR3 b2 RegADDR2 b1 RegADDR1 b0 RegADDR0 Table 8. b7 DATA7 Register data format b6 DATA6 b5 DATA5 b4 DATA4 b3 DATA3 b2 DATA2 b1 DATA1 b0 DATA0 12/21 STC3100 Figure 8. Master I2C interface Read operation Slave Start Device addr 7 bits WA Reg address 8 bits A Restart Device addr 7 bits RA Reg data 8 bits A Reg data 8 bits Address n+1 A Reg data 8 bits Address n+2 A Stop Start bit = SDA falling when SCL = 1 Stop bit = SDA rising when SCL = 1 Restart bit = start after a start Acknowledge = SDA forced low during a SCL clock AM00833 Figure 9. Write operation Start Device addr 7 bits WA Reg address 8 bits A Reg data 8 bits A Reg data A 8 bits Address n+1 Reg data 8 bits Address n+2 A Stop Start bit = SDA falling when SCL = 1 Stop bit = SDA rising when SCL = 1 Restart bit = start after a start AM00834 13/21 I2C interface STC3100 8.2 Register map The register space provides 12 control registers, 8 read-only (factory OTP) registers for unique device ID and 32 read/write general-purpose RAM registers. Mapping of all registers is shown in Table 9. Detailed descriptions of registers 0 (REG_MODE) and 1 (REG_CTRL) are shown in Table 10 and Table 11. All registers are reset to default values at power-on or reset, and the PORDET bit in register REG_CTRL is used to indicate the occurrence of a power-on reset. Table 9. Register map Name Control registers REG_MODE REG_CTRL REG_CHARGE_LOW REG_CHARGE_HIGH REG_COUNTER_LOW REG_COUNTER_HIGH REG_CURRENT_LOW REG_CURRENT_HIGH REG_VOLTAGE_LOW REG_VOLTAGE_HIGH REG_TEMPERATURE_LOW REG_TEMPERATURE_HIGH Device ID registers REG_ID0 REG_ID1 REG_ID2 REG_ID3 REG_ID4 REG_ID5 REG_ID6 REG_ID7 RAM registers REG_RAM0 ... REG_RAM31 Address (decimal) 0 to 23 0 1 2 3 4 5 6 7 8 9 10 11 24 to 31 24 25 26 27 28 29 30 31 32 to 63 32 ... 63 R/W R/W General-purpose RAM register 0 ... General-purpose RAM register 31 R R R R R R R R Part type ID = 10h Unique part ID, bits 0-7 Unique part ID, bits 8-15 Unique part ID, bits 16-23 Unique part ID, bits 24-31 Unique part ID, bits 32-39 Unique part ID, bits 40-47 Device ID CRC R/W R/W R R R R R R R R R R Mode register Control and status register Gas gauge charge data, bits 0-7 Gas gauge charge data, bits 8-15 Number of conversions, bits 0-7 Number of conversions, bits 8-15 Battery current value, bits 0-7 Battery current value, bits 8-15 Battery voltage value, bits 0-7 Battery voltage value, bits 8-15 Temperature value, bits 0-7 Temperature value, bits 8-15 Type Description 14/21 STC3100 I2C interface Values held in consecutive registers (such as the charge value in the REG_CHARGE_LOW and REG_CHARGE_HIGH registers) must be read with a single I2C access to ensure data integrity. It is possible to read multiple values in one I2C access, all values will be consistent. The charge data is coded in 2's complement format, and the LSB value is 6.70 uV.h. The battery current is coded in 2's complement format, and the LSB value is 11.77 uV. In 13-bit resolution mode, the 0 bit is always set to zero. In 12-bit resolution, bits 0 and 1 are always set to zero. The battery voltage is coded in binary format, and the LSB value is 2.44 mV. The temperature value is coded in 2's complement format, and the LSB value is 0.125 C. The temperature of 0 C corresponds to code 0. Table 10. Name SEL_EXT_CLK GG_RES GG_CAL REG_MODE - address 0 Pos. 0 [2,1] 3 Type R/W R/W R/W Def. 0 00 0 Description 32,768 Hz clock source: 0: auto-detect, 1: external clock Gas gauge ADC resolution: 00:14 bits, 01:13 bits, 10:12 bits 0: no effect 1: used to calibrate the AD converters 0: standby mode. Accumulator and counter registers are frozen, gas gauge and battery monitor functions are in standby. 1: operating mode. Unused GG_RUN 4 R/W 0 [7..5] Table 11. Name REG_CTRL - address 1 Pos. Type R Def. X 1 Description Port IO0 data status: 0 = IO0 input is low, 1 = IO0 input is high Port IO0 data output drive: 0 = IO0 output is driven low,1 = IO0 output is open 0: no effect 1: resets the charge accumulator and conversion counter. GG_RST is a self-clearing bit. Set at the end of a battery current conversion cycle. Clears upon reading. Set at the end of a battery voltage or temperature conversion cycle. Clears upon reading. Power on reset (POR) detection bit: 0 = no POR event occurred, 1 = POR event occurred Soft reset: 0 = release the soft-reset and clear the POR detection bit, 1 = assert the soft-reset and set the POR detection bit. Unused IO0DATA 0 W GG_RST 1 W 0 GG_EOC VTM_EOC 2 3 R R 1 1 R PORDET 4 W 1 0 [7..5] 15/21 Package information STC3100 9 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 16/21 STC3100 Package information 9.1 MiniSO-8 package information Figure 10. MiniSO-8 package mechanical drawing Table 12. Miniso-8 package mechanical data Dimensions Ref. Min. A A1 A2 b c D E E1 e L L1 L2 k ccc 0 0.40 0.75 0.22 0.08 2.80 4.65 2.80 Millimeters Typ. Max. 1.10 0.15 0.85 0.95 0.40 0.23 3.00 4.90 3.00 0.65 0.60 0.95 0.25 8 0.10 0.80 0.016 3.20 5.15 3.10 0.030 0.009 0.003 0.110 0.183 0.110 Min. Inches Typ. Max. 0.043 0.006 0.033 0.037 0.016 0.009 0.118 0.193 0.118 0.026 0.024 0.037 0.010 0.031 0.126 0.203 0.122 0.004 17/21 Package information STC3100 9.2 DFN8 package information Figure 11. DFN8 3x3x1.0 mm package mechanical drawing (pitch 0.5 mm) Table 13. DFN8 3x3x1.0 mm package mechanical data (pitch 0.5 mm) Dimensions Ref. Min. A A1 A2 A3 b D D2 E E2 e L ddd 0.30 0.18 2.85 2.20 2.85 1.40 0.55 0.80 Millimeters Typ. 0.90 0.02 0.65 0.20 0.25 3.00 0.30 3.15 2.70 3.00 3.15 1.75 0.50 0.40 0.50 0.08 0.012 0.007 0.112 0.087 0.112 0.055 Max. 1.00 0.05 0.80 0.021 Min. 0.031 Inches Typ. 0.035 0.0008 0.025 0.008 0.010 0.118 0.012 0.124 0.106 0.118 0.124 0.069 0.020 0.016 0.020 0.003 Max. 0.039 0.0019 0.031 18/21 STC3100 Ordering information 10 Ordering information Table 14. Order codes Temperature range -40C, +85C STC3100IQT DFN8 3 x 3 Package MiniSO-8 Tape & reel O201 Packing Marking Part number STC3100IST 19/21 Revision history STC3100 11 Revision history Table 15. Date 27-Jan-2009 Document revision history Revision 1 Initial release. Changes 20/21 STC3100 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2009 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 21/21 |
Price & Availability of STC3100
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |