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F75386M/F75386SG Datasheet
Dual 1oC Accuracy Temperature Sensor IC with Fan Speed Control
Release Date: July, 2007 Revision: V0.27P
F75386
F75386 Datasheet Revision History
Version 0.20P 0.21P 0.22P 0.23P 0.24P 0.25P 0.26P 0.27P Date Feb.,2005 Mar.,2005 Mar.,2005 Dec.,2005 Feb.,2006 Dec, 2006 Jan, 2007 July, 2007 1 15 17 11,13,18,23 Page Original version Add ARA register Index FDh (1) Revise Index 02/Index 16/Index 10-2Fh (2) Add MSOP Package and delete SOP package Revise typo Add SOP Green package description Add Taiwan patent certification number
Register-0x4C description correction Company readdress
Revision History
Please note that all data and specifications are subject to change without notice. All the trade marks of products and companies mentioned in this data sheet belong to their respective owners.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Fintek for any damages resulting from such improper use or sales.
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F75386 Table of Contents
1. 2. 3. 4. 5. 6. General Description ............................................................................................................ 1 Features.............................................................................................................................. 1 Key Specifications .............................................................................................................. 2 Pin Configuration ................................................................................................................ 2 Pin Descriptions.................................................................................................................. 2 Functional Description ........................................................................................................ 3 6.1 General Description ........................................................................................................ 3 6.2 Access Interface ............................................................................................................. 3 6.3 Typical Operating Characteristics ................................................................................... 5 6.4 Temperature Monitoring.................................................................................................. 6 6.4 Alert# Signal ................................................................................................................... 7 6.5 Temperature Fault Queue............................................................................................... 9 7. Registers Description.......................................................................................................... 9 7.1 Configuration Register Index 03h (09h) ............................................................... 9 7.2 Status Register 1 Index 02h ................................................................................ 10 7.3 Status Register 2 Index 18h ................................................................................ 10 7.4 Real-Time Status Register Index 2Eh ................................................................ 11 7.5 Conversion Rate Register Index 04h (0Ah)........................................................ 11 7.6 Serial Interface Timeout Register Index 22h ...................................................... 12 7.7 ALERT MASK Register 1 Index 16h................................................................... 12 7.8 ALERT MASK Register 2 Index 17h.................................................................... 13 7.9 PWM Control Register Index 30h....................................................................... 13 7.10 FINTEK PWM Control Register Index 31h (Fintek Mode) .................................. 14 7.11 PWM Control and Fan Monitor Register Index 4Ah ............................................ 14 7.12 Fan Spin-Up Configuration Register Index 4Bh ................................................. 14 7.13 PWM Value Register Index 4Ch......................................................................... 15 7.14 7.15 7.16 7.17 7.18 7.19 7.20 8. 9. FAN PWM Frequency Register Index 4Dh ......................................................... 15 Lookup Table Hysteresis Register Index 4Fh ..................................................... 16 Temperature vs. PWM Duty Lookup Table Registers Index 50h to 5Fh ............. 16 ALERT Mode and Temperature Filter Control Register -- Index BFh ..................... 16 ARA Register--- Index FDh .................................................................................... 16 Vendor ID II (Manufacturer ID) Register Index FEh............................................ 17 Temperature and Fan Count Value Registers Index 10h- 2Fh ............................ 17
PCB Layout Guide ............................................................................................................ 17 Electrical characteristic ..................................................................................................... 19
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9.1 Absolute Maximum Ratings............................................................................................. 19 9.2 DC Characteristics .......................................................................................................... 19 9.3 AC Characteristics........................................................................................................... 20 10 Ordering Information ........................................................................................................... 21 11 Package Dimensions ........................................................................................................ 22 12 Application Circuit................................................................................................................ 1
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1.
General Description
The F75386 is a temperature sensor IC with fan speed monitoring and controlling function which is specific designed for notebook etc. An 11-bit analog-to-digital converter (ADC) was built inside F75386. The F75386 can provide 2 remote temperature sensor and 1 local temperature sensor. The remote temperature sensor can be performed by CPU/GPU thermal diode or transistor 2N3906. The F75386 can also provide alert signals for system protection which is optional with fan speed monitoring and controlling. The users can set up the upper and lower limits (alarm thresholds) of all monitored parameters and this chip will issue warning messages for system protection if there is something wrong with monitored items. As for fan speed control, the fan speed will be related to temperature variations. The F75386 can use PWM duty cycle output to automatically control fan speed. There are 8 steps PWM duty cycle output for users to program according to the temperature variations. Through the BIOS or application software, the users can read all the monitored parameters of system all the time. And a pop-up warning can be also activated when the monitored item was out of the proper/pre-setting range. The F75386 is in the green package of 8-pin MSOP/SOP and powered by 3.3V.
2.
Features
Provide 1 on-chip local and 2 remote temperature sensing 1 oC accuarcy on remote channel(+60 oC to +126 oC) Integrated fan speed monitoring function and PWM duty cycle output for automatic fan speed control User selectable multi-function pin for either tachometer input or ALERT# output function User selectable multi-function pin for either PWM duty cycle output or THERM# output function ALERT# output for SMBus alert THERM# output for over temperature alert or for system shut down Programmable THERM# limits and THERM# hysteresis Programmable alert queue and limited and setting points(alert threshold) for monitored items 2 wire SMBus interface 3VCC operation and in 8-MSOP/SOP green package Patented: TW235231, TWI263778
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3.
Key Specifications
Supply Voltage Supply Current Measured Range Remote Diode Temperature Accuracy Local Temperature Accuracy 3.0~3.6V 630 uA (@ conversion rate = 16Hz) 0 ~ 145.75 oC 1 oC from +60oC to +126oC 3 oC from 0oC to +100oC
4.
Pin Configuration
VCC D1+ D2+ THERM#/PWMOUT
1 2 3 4
F75386M F75386SG
8 7 6 5
SCL SDA ALERT# / FANIN GND
5.
Pin Descriptions
- Pure Open-drain output pin with 12 mA sink capability - TTL level input pin and schmitt trigger - Input pin(Analog) - Power
POD12 INts AIN PWR
PIN NO 1 2
PIN NAME VCC D1+
TYPE PWR AIN
PWR VCC VCC Power Pin
DESCRIPTION
Positive connection to remote temperature sensor (ex: thermal diode anode)
3
D2+
AIN
VCC
Positive connection to remote temperature sensor (ex: thermal diode anode)
4
THERM# PWMOUT
POD12
(5V-tolerance)
VCC
This is a multi-function pin. Power-on default is THERM# function. When it acts as PWMOUT function, it uses PWM duty cycle output to control the fan speed. When it acts as THERM# function, it will be asserted when the temperature exceeds its THERM limit.
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5 6 GND ALERT# FANIN PWR OD12 / INts
(5V-tolerance)
VCC VCC
Ground This is a multi-function pin. Power-on default is ALERT# function. When it acts as ALERT# function, it will be asserted when the temperature exceeds its high limit or goes below its low limit. When it is as FANIN function, it is for monitoring the fan speed.
7
SDA
INts/OD12
(5V-tolerance)
VCC
Serial bus data
8
SCL
INt s
(5V-tolerance)
VCC
Serial bus clock
6. Functional Description
6.1
General Description
The F75386 is a temperature sensor IC with fan speed monitoring and controlling function which is specific designed for notebook etc. An 11-bit analog-to-digital converter (ADC) was built inside F75386. The F75386 can provide 2 remote temperature sensor and 1 local temperature sensor. The remote temperature sensor can be performed by CPU/GPU thermal diode or transistor 2N3906. The F75386 can also provide alert signals for system protection which is optional with fan speed monitoring and controlling. The users can set up the upper and lower limits (alarm thresholds) of all monitored parameters and this chip will issue warning messages for system when there is something wrong with monitored items. As for fan speed control, the fan speed will be related to temperature variation. The F75386 can use PWM duty cycle output to automatically control fan speed. There are 8 steps PWM duty cycle output for users to program according to the temperature variation.
6.2
Access Interface
The F75386 can be connected to a compatible 2-wire serial system management bus as a slave device under the control of the master device, using two device terminals SCL and SDA. The F75386 supports SMBus protocol of, "Write Byte", "Read Byte", both with or without Packet Error checking(PEC) which is calculated using CRC-8. For detail information about PEC, please check SMBus 1.1 specification. The F75386 supports 25ms timeout for no activity on the SMBus. This timeout function is programmed at 22h bit7 and default is disabled. F75386 also supports Alert Response Address(ARA) protocol.The operation of the protocol is described with details in the following sections.
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(a) SMBus write to internal address register followed by the data byte
0 SCL SDA
Start By Master
7
8
0
7
8
1
0
0
1
1
0
0
R/W
Ack by 386
D7
D6
D5
D4
D3
D2
D1
D0
Ack by 386
Frame 1 Serial Bus Address Byte 0
Frame 2 Internal Index Register Byte
7 SCL (Continued) SDA (Continued) D7 D6 D5 D4 D3 D2 D1 D0
8
Stop by Master
Frame 3 Data Byte
Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte
(b) Serial bus write to internal address register only
0 SCL SDA
Start By Master
7
8
0
7
8
1
0
0
1
1
0
0
R/W
Ack by 386
D7
D6
D5
D4
D3
D2
D1
D0
Ack by 386 Stop by Master
Frame 1 Serial Bus Address Byte 0
Frame 2 Internal Index Register Byte
Figure 2. Serial Bus Write to Internal Address Register Only
(c) Serial bus read from a register with the internal address register prefer to desired location
0 SCL SDA
Start By Master
7
8
0
7
8
1
0
0
1
1
0
0
R/W
Ack by 386
D7
D6
D5
D4
D3
D2
D1
D0
Ack by Master Stop by Master
Frame 1 Serial Bus Address Byte 0
Frame 2 Internal Index Register Byte
Figure 3. Serial Bus Read from Internal Address Register
(d) Alert Response Address
0 SCL SDA
Start By Master
7
8
0
7
8
0
0
0
1
1
0
0
R/W
Ack by 386
0
1
0
0
1
1
0
0
Ack by Master Stop by Master
Frame 1 Alert Response Address 0
Frame 2 Device Address
Figure 4. Alert Response Address
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6.3 Typical Operating Characteristics
(a) Temperature Error vs.D+/D- Capacitance
Temperature error(J ) vs. D+/D- capacitance
0 -2 J Temperature error( -4 -6 -8 -10 -12 -14 -16 -18 0 10 20 30 40 50 60 70 80 Capacitance(nf) 90 100 110 120 130
(b) Local Temperature Error vs. Die Temperature
Local Temperature error(J )
3.5
Temperatureerror(J )
3 2.5 2 1.5 1 0.5 0 -0.5 0 10 20 30 40 50 60 70 80 90 100 110 120
Temperature(J )
(c) Remote Diode Error vs. Remote Temperature Error
2.5
Remote Temperature Error
Temperature Error
2 1.5 1 0.5 0 -0.5 -1 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
Temperature
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(d) Operating Supply Current vs. Conversion Rate
Operating current (uA)
900 800 700 600 500 400 300 200 100 0
0.0625 0.125 0.25 0.5 1 2 4 8 16 32
FAN output Duty = 100% FAN output Duty = 50%
Operating current (uA)
Conversion rate(Hz)
6.4 Temperature Monitoring
The F75386 can provide one local and two remote temperature sensors. Both can be measured from 0C to 126.75C. The temperature format is as the following table:
Temperature ( High Byte )
Digital Output
Temperature ( Low Byte )
Digital Output
0C 1C 25C 50C 75C 90C 100C 126C
0000 0000 0000 0001 0001 1001 0011 0010 0100 1011 0101 1010 0110 0100 0111 1110
0C 0.125C 0.250C 0.375C 0.500C 0.625C 0.750C 0.875C
000 0 0000 001 0 0000 010 0 0000 011 0 0000 100 0 0000 101 0 0000 110 0 0000 111 0 0000
Remote-sensor transistor manufacturers
Manufacturer Panasonic Philips Model Number 2SB0709 2N3906 PMBT3906
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6.4
Alert# Signal
ALERT#/FANIN (pin 6) can be used as ALERT# output or fan tachometer input by setting Configuration Register (index 03h). When pin 6 is used as ALERT# output, there are three different alert functions can be used. The interrupt methods that ALERT# pin can act are (1) Comparator mode (2) Interrupt mode (3) Alert Response Address mode.
6.4.1 Comparator mode
When the Comparator Mode bit in Configuration Register (index BFh) is asserted, ALERT# is used as a temperature comparator. If the triggering conditions occur, ALERT# will go to low and relative alert status will be asserted until those conditions are no longer present. This mode is not the power-on default state. Note that the triggering conditions do not include BUSY and OPEN status in Configuration Register (index 02h).
Remote Temperature High Limit
Monitoring Remote Temperature
F75386 ALERT# pin
Remote High Alert Status
TIME
6.4.2 Interrupt mode
The F75386's ALERT# output can be used as a simple interrupt signal if Comparator Mode bit is not asserted. If the triggering conditions occur, relative alert status will be asserted and ALERT# will go to low. The F75386 will set the ALERT Mask bit and relative alert status will be cleared after master's reading of the Status Register (Index 02h or 18h). The ALERT Mask bit is set in order to prevent further ALERT# triggering after the end of one temperature conversion if the triggering conditions are still present. At the end of interrupt service routine, the master has to reset ALERT Mask bit in configuration register. Note that the triggering conditions do not include BUSY and OPEN status in Configuration Register (index 02h).
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Remote Temperature High Limit
Monitoring Remote Temperature F75386 ALERT# pin
Remote High Alert Status
ALERT Mask
End of temperature conversion ALERT Mask is set and Alert Status is clear after reading status register TIME
6.4.3 Alert Response Address mode
If ALERT# is connected to one or more ALERT# outputs of SMBus compatible devices, the master may send an ARA command to ask that which device is pulling ALERT# to low. When the ALERT# is pulled to low by F75386 and F75386 receives the ARA command sent by the master, F75386 will send its address to the master. The F75386 will reset its ALERT# output and set the ALERT Mask bit once the master acknowledges its response of device address. The master may read F75386's status registers to check what the triggering conditions occur. At the end of interrupt service routine, the master has to reset ALERT Mask bit in configuration register. Note that the triggering conditions do not include BUSY and OPEN status in Configuration Register (index 02h). The ARA, 000 1100, is a general call address and is defined in SMBus specifications. No devices should be assigned to this address.
Remote Temperature High Limit
Monitoring Remote Temperature F75386 ALERT# pin
Remote High Alert Status
ALERT Mask
Alert Status is cleared after reading status register ALERT Mask is set after alerting device address is transmitted correctly TIME
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6.5
Temperature Fault Queue
The F75386 provides a Fault Queue bit in Configuration Register (index 03h) to prevent false alert triggering. By setting
Fault Queue bit to a 1, the F75386 will require three consecutive triggering conditions of temperature readings to set relative alert status bits to 1. The power-on default value of Fault Queue bit is 0.
Monitoring Remote Temperature Remote Temperature High Limit
Remote High Alert Status (comparator mode)
n
n+1
n+2
n+3
n+4
n+5
n+6
n+7
n+8
n+9
n+10
n+11
Sample Number
7.
Registers Description
7.1
Configuration Register Index 03h (09h)
Power on default <7:0> = 00h
Bit Name Attribute Description
7 6 5
ALERT_MASK RUN_STOP PWM_DIS_STBY
R/W R/W R/W
Set to 1, mask ALERT# signal output. Set to 0, monitor. Set to 1, stop monitor (in standby).
Set to 1, PWMOUT will be disabled while in standby. (when bit 6 is set to 1)
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Set to 0, the F75386's PWM output continues to output the control signal while in standby. (when bit 6 is set to 1) 4~3 2 1 0 Reserved ALERT_TACH_SEL Reserved ALERT_QUEUE RO R/W Set to 0, pin6 acts as ALERT output. RO R/W Set to 0, an ALERT# will be generated if any abnormal event occurs. This bit is unused and always set to 0 Set to 1, an ALERT# will be generated if consecutive abnormal events occur three times. These bits are unused and always set to 0 Set to 1, pin6 acts as fan Tachometer input.
7.2
Status Register 1 Index 02h
Power on default <7:0> = 00h T1 = On-chip temperature sensor (Local)
Bit Name Attribute
T2 = Pin 2 external temperature sensor (Remote)
Description
7 6
ADC_BUSY T1_HIGH_STS
RO RO
Set to 1, ADC is converting. Set to 1, T1 temperature exceeds high limit. Set to 0, T1 temperature does not exceed high limit. Set to 1, T1 temperature goes below low limit.
5
T1_LOW_STS
RO Set to 0, T1 temperature does not go below low limit. Set to 1, T2 temperature exceeds high limit.
4
T2_HIGH_STS
RO Set to 0, T2 temperature does not exceed high limit. Set to 1, T2 temperature goes below low limit.
3
T2_LOW_STS
RO Set to 0, T2 temperature does not go below low limit. Set to 1, T2 is open-circuit
2
T2_OPEN_STS
RO Set to 0, T2 is not open-circuit Set to 1, T2 temperature exceeds its thermal limit.
1
T2_THERM_STS
RO Set to 0, T2 temperature does not exceed its thermal limit. Set to 1, FAN count is higher than the FAN limit value
0
FAN_ALARM
RO Set to 0, FAN count is equal or lower than the FAN limit value.
7.3
Status Register 2 Index 18h
Power on default <7:0> = 00h T1 = On-chip temperature sensor (Local) T3= Pin 3 external temperature sensor (Remote)
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Bit Name Attribute Description
7
T1_THERM_STS
RO
Set to 1, T1 temperature exceeds its THERM limit. Set to 0, T1 temperature does not exceed its THERM limit.
6 5 4
Reserved Reserved T3_HIGH_STS
RO RO RO
This bit is unused and always set to 0 This bit is unused and always set to 0 Set to 1, T3 temperature exceeds high limit. Set to 0, T3 temperature does not exceed high limit.
3
T3_LOW_STS
RO
Set to 1, T3 temperature goes below low limit. Set to 0, T3 temperature does not go below low limit.
2
T3_OPEN_STS
RO
Set to 1, T3 is open-circuit or shorted to VDD. Set to 0, T3 is not open-circuit and not shorted to VDD
1
T3_THERM_STS
RO
Set to 1, T3 temperature exceeds its THERM limit. Set to 0, T3 temperature does not exceeds its THERM limit.
0
Reserved
RO
This bit is unused and always set to 0
7.4
Real-Time Status Register Index 2Eh
Power on default <7:0> = 00h T1 = On-chip temperature sensor (Local) T2 = Pin 2 external temperature sensor (Remote)
Bit Name Attribute
T3= Pin 3 external temperature sensor (Remote)
Description
7-3 2 1 0
Reserved T3_THERM
RO RO
These bits are unused and always set to 0 Set to 1, T3 temperature exceeds its thermal limit This is a real-time event status
T2_THERM T1_THERM
RO RO
Set to 1, T2 temperature exceeds its thermal limit This is a real-time event status Set to 1, T1 temperature exceeds its thermal limit This is a real-time event status
7.5
Conversion Rate Register Index 04h (0Ah)
Power on default <7:0> = 08h
Bit Name Attribute Description
7-0
CONV_RATE
R/W
Set conversion times per second. Value Conversion/Sec Value Conversion/Sec
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00h 01h 02h 03h 04h 05h 0.0625 0.125 0.25 0.5 1 2 06h 07h 08h 09h 0Ah ~ FFh 4 8 16 32 Reserved
7.6
Serial Interface Timeout Register Index 22h
Power on default <7:0> = 00h
Bit Name Attribute Description
7 6-0
EN_I2CTMOUT Reserved
R/W RO
Set to 1, enable serial interface timeout function. (25ms). Set to 0, disable. These bits are unused and always set to 0
7.7
ALERT MASK Register 1 Index 16h
Power on default <7:0> = A4h T1 = On-chip temperature sensor (Local)
Bit Name
T2 = Pin 2 external temperature sensor (Remote)
Description
Attribute
7 6
Reserved T1H_MASK
RO RO
This bit is unused and always set to 1 Set to 1, T1 temperature exceeds high limit will not generate an ALERT. Set to 0, T1 temperature exceeds high limit will generate an ALERT. Set to 1, T1 temperature goes below low limit will not generate an ALERT.
5
T1L_MASK
RO Set to 0, T1 temperature goes below low limit will generate an ALERT. Set to 1, T2 temperature exceeds high limit will not generate an ALERT.
4
T2H_MASK
RO Set to 0, T2 temperature exceeds high limit will generate an ALERT. Set to 1, T2 temperature goes below low limit will not generate an ALERT.
3 2 1
T2L_MASK Reserved T2_THR_MASK
RO Set to 0, T2 temperature goes below low limit will generate an ALERT. RO RO Set to 0, T2 temperature exceeds its thermal limit will generate an ALERT. Set to 1, FAN count exceeds its limit will not generate an ALERT. This bit is unused and always set to 1 Set to 1, T2 temperature exceeds its thermal limit will not generate an ALERT.
0
FAN_MASK
RO Set to 0, FAN count exceeds its limit will generate an ALERT.
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7.8
ALERT MASK Register 2 Index 17h
Power on default <7:0> = 00h T3 = Pin 3 external temperature sensor (Remote)
Bit Name Attribute Description
Set to 1, T3 temperature exceeds its THERM limit will not generate an ALERT. 7 6-5 4 T1_THR_MASK Reserved T3H_MASK RO Set to 0, T3 temperature exceeds its THERM limit will generate an ALERT. RO RO Set to 0, T3 temperature exceeds high limit will generate an ALERT. Set to 1, T3 temperature goes below low limit will not generate an ALERT. 3 2 1 0 T3L_MASK Reserved T3_THR_MASK Reserved RO Set to 0, T3 temperature goes below low limit will generate an ALERT. RO RO Set to 0, T3 temperature exceeds its THERM limit will generate an ALERT. RO This bit is unused and always set to 0 This bit is unused and always set to 0 Set to 1, T3 temperature exceeds its THERM limit will not generate an ALERT. These bits are unused and always set to 0 Set to 1, T3 temperature exceeds high limit will not generate an ALERT.
7.9
PWM Control Register Index 30h
Power on default <7:0> = 20h
Bit Name Attribute Description
7 6
FTK_MODE Reserved
R/W RO
Set method of controlling PWM duty and frequency to FINTEK mode. This bit is unused and always set to 0 When bit7 set to 0, tachometer input filter can be selected here. 2'b00: Filter time = 177.6us
5-4
FLT_SEL
R/W
2'b01: Filter time = 355.2us 2'b10: Filter time = 888us 2'b11: Filter time = 1.776ms
3 2
Reserved DIS_CLKCTRL
RO R/W
This bit is unused and always set to 0 Set to 1, disable the clock adjustment for different operating temperature. Set to 0, enable the clock adjustment for different operating temperature. Set to 1, select PWMOUT output.
1
PT_SEL
R/W Set to 0, select THERM# output. Set to 1, select only one external thermal diode. At this mode, T3(2
nd
external) `s reading
0
ONE_T
R/W
and status will be set to FFh and 00h. Set to 0, select two external thermal diodes.
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7.10 FINTEK PWM Control Register Index 31h (Fintek Mode)
Power on default <7:0> = 00h
Bit Name Attribute Description
Set to 0, PWM source clock is 2 MHz. 7 FTK_PWMCLK_SEL R/W Set to 1, PWM source clock is 200 kHz. Set to 0 or 1 makes no different. PWM clock is divided by this value. 6-0 FTK_PREDIV R/W PWM clock = PWMOUT source clock/FTK_PREDIV
7.11 PWM Control and Fan Monitor Register Index 4Ah
Power on default <7:0> = 20h
Bit Name Attribute Description
7-6
Reserved
RO
These bits are not used and always set to 0
0: operates in TEMPERATURE mode. PWMOUT duty-cycle is automatically adjusted
according to the T-P (Temperature vs. PWM) lookup table. Look-up table is locked. 5 PWM_MODE R/W
1: operates in MANUAL mode. Software set the PWMOUT duty-cycle directly. Look-up
table is programmable. 0: PWM output will be 0 V to turn off FAN and open (High-Z) to turn on fan. 4 PWM_INV R/W 1: PWM output will be open to turn off FAN and 0 V to turn on fan. 1: PWMOUT frequency source is 333 kHz. 3 2 PWM_CLK_SEL
Reserved
R/W 0: PWMOUT frequency source is 1.4 kHz. R/W This bit is not used and always set to 0 00: Traditional Tachometer Input Mode 01: Improved Traditional Tachometer Input Mode
1-0
Tachometer Mode
R/W
10: Most Accurate Mode 11: Least Effort Mode Note: If the PWM Clock is 333 kHz, Traditional Tachometer Input Mode is always used.
7.12 Fan Spin-Up Configuration Register Index 4Bh
Power on default<7:0> = 3Fh
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Bit Name Attribute Description
7-6
Reserved
RO
These bits are not used and always set to 0. 0: The spin-up time and duty depends on bit 4-0.
Fast Tachometer 5 Spin-up R/W
1: Sets the PWMOUT to 100% until the spin-up times out or the minimum RPM limit is reached. When this bit is set, the spin-up duty cycle is always 100%. If PWM spin up time (bit2-0) = 000, the spin-up process is bypassed.
PWM Spin-Up Duty 4-3 Cycle R/W
00: No spin-up (unless bit5 is set to 0) 01: 50% 10: 75%~81%. Depends on PWM frequency select. 11: 100%.(default) The time unit is 0.5 second. The default time is 3.5 seconds 000: No Spin-up. 001: 0.5 seconds 010: 1.0second
2-0
PWM Spin-Up Time
R/W
011: 1.5 second 100: 2.0 second 101: 2.5 second 110: 3.0 second 111: 3.5 second
7.13 PWM Value Register Index 4Ch
Power on default<7:0> =00h
Bit Name Attribute Description
If PWM_MODE is set to 0, this register is read only and reflects the current PWM 7-0 PWM_DUTY R/W duty-cycle value from the T-P lookup table. If PWM_MODE is set to 1, this register is read/write and the software programs this register directly.
7.14 FAN PWM Frequency Register Index 4Dh
Power on default<7:0> =17h
Bit Name Attribute Description
7-5 4-0
Reserved PWM_FREQ
RO R/W
These bits are unused and always set to 0 PWM frequency = PWM_CLK / 2n (PWM_CLK = 333 kHz or 1.4 kHz , n = value of this register)
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7.15 Lookup Table Hysteresis Register Index 4Fh
Power on default<7:0> = 04h
Bit Name Attribute Description
7-5 4-0
Reserved LOOKUP HYST
RO R/W
These bits are unused and always set to 0 Lookup table hysteresis. (Default 4C ; 1LSB = 1C)
7.16 Temperature vs. PWM Duty Lookup Table Registers Index 50h to 5Fh
Power on default<7:0> = 7Fh and 3Fh
Index Name Bits Description
50(52,54,56,58, TEMP(x) 5A,5C,5E)
7
This bit is unused and always set to 0 When T2 (external) temperature exceeds (greater than) this value, PWM output will be the value of INDEX 5(y)h register. These bits are unused and always set to 0 PWM output value corresponds to the temperature entry in INDEX 5(x)h.
6-0
51(53,55,57,59, DUTY(y) 5B,5D,5F)
7-6 5-0
7.17 ALERT Mode and Temperature Filter Control Register -- Index BFh
Power on default<7:0> = 00h
Bit Name Attribute Description
7-3 2-1 0
Reserved Reserved
Comparator
RO R/W R/W
These bits are unused and always set to 0 Rewriteable register 0: ALERT# is INTERRUPT mode 1: ALERT# is COMPARATOR mode
Mode
7.18 ARA Register--- Index FDh
Power on default: 0Ch. (ARA address = 18h)
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7.19 Vendor ID II (Manufacturer ID) Register Index FEh
Power on default: 23h.
7.20 Temperature and Fan Count Value Registers Index 10h- 2Fh
T1: Local Temperature.
T2: External Temperature 1.
T3:External Temperature 2
The value in quota is its power-on default value.
Address Description Attribute (High Byte) Address (Low Byte)
T1 reading T2 reading T3 reading T1 High Limit T1 Low Limit T2 High Limit T2 Low Limit T3 High Limit T3 Low Limit T1 Thermal Limit T1 Thermal Hysteresis T2 Thermal Limit T2 Thermal Hysteresis T3 Thermal Limit T3 Thermal Hysteresis FAN Tachometer Count FAN Tachometer Limit
RO RO RO R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
00h 01h 28h 05h/0Bh (46h) 06h/0Ch (00h) 07h/0Dh (55h) 08h/0Eh (55h) 2Ah (55h) 2Bh (00h) 20h (55h) 23h (0Ah) 19h (64h) 21h (0Ah) 24h (55h) 25h (0Ah) 47h (FFh) 49h (FFh)
1Ah 10h 29h 1Bh (00h) 1Ch (00h) 13h (00h) 14h (00h) 2Ch (00h) 2Dh (00h)
46h (FFh) 48h (FFh)
8. PCB Layout Guide
PCB can be electrically noisy environments, and the F75386 is measuring very small voltage from the remote sensor, so care must be taken to minimize noise which is occurred at the sensor inputs. The following guideline should be taken to reduce the measurement error of the temperature sensors:
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1. Place the F75386 as close as practical to the remote sensing diode. In noisy environments, such as a computer main-board, the distance can be 4 to 8 inches. (typ). This length can be increased if the worst noise sources are avoided. Noise sources generally include clock generators, CRTs, memory buses and PCI/ISA bus etc. 2. Route the D+ and Pin5 GND(D-) tracks close together, in parallel, with grounded guard tracks on each side. Provide a ground plane under the tracks if possible. Do not route D+ & Pin5 GND(D-) lines next to the deflection coil of the CRT. And also don't route the trace across fast digital signals which can easily induce bigger error.
GND 10MILS D+ MINIMUM Pin5 GND(D-) 10MILS GND 10MILS 10MILS
3. Use wide tracks to minimize inductance and reduce noise pickup. 10 mil track minimum width and spacing is recommended. 4. Try to minimize the number of copper/solder joints, which can cause thermocouple effects. Where copper/solder joints are used, make sure that they are in both the D+ and Pin5 GND(D-) path and at the same temperature. Thermocouple effects should not be a major problem as 1J corresponds to about 200V. It means that a copper-solder thermocouple exhibits 3V/J , and takes about 200V of the voltage error at D+ & Pin5 GND(D-) to cause a 1J measurement error. Adding a few thermocouples causes a negligible error. 5. Place a 0.1F bypass capacitor close to the VDD pin. In very noisy environments, place an external 3300pF input filter capacitors across D+, Pin5 GND(D-) close to the F75386. 6. If the distance to the remote sensor is more than 8 inches, the use of twisted pair cable is recommended. It will work up to around 6 to 12 feet. 7. Because the measurement technique uses switched current sources, excessive cable and/or filter capacitance will affect the measurement accuracy. When using long cables, the filter capacitor may be reduced or removed. Cable resistance can also induce errors. 1 series resistance introduces about
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0.5J error.
9. Electrical characteristic
9.1 Absolute Maximum Ratings
PARAMETER Power Supply Voltage Input Voltage Operating Temperature Storage Temperature RATING -0.5 to 5.5 -0.5 to VDD+0.5 0 to +140 -55 to 150 UNIT V V
C C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device
9.2 DC Characteristics
(TA = 0 C to 70 C, VDD = 3.3V 10%, VSS = 0V )
Parameter Temperature Error, Remote Diode
o
Conditions 60 C < TD < 126 C, VCC = 3.0V to 3.6V 0 oC

o
MIN
TYP
MAX
Unit
o
1 1 1
3.0 3.3 630 430 5 0.125
C
3 3
3.6
o
Temperature Error, Local Diode Supply Voltage range Average operating supply current
0 C < TA < 100 C, VCC = 3.0V to 3.6V
o
o
C
V uA uA uA
o
16 Conversions / Sec Rate 0.0625 Conversions / Sec Rate
Standby supply current Resolution Under-voltage lockout threshold Power on reset threshold Diode source current High Level Low Level VDD input, Disables ADC , Rising Edge
C
2.55 2.2 95 10 2.4
V V uA uA
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(TA = 0 C to 70 C, VDD = 3.3V 10%, VSS = 0V) PARAMETER SYM. MIN. TYP. MAX. UNIT CONDITIONS
OD16 - Open-drain output pin with sink capability of 16 mA Output Low Current INts IOL 10 12 mA VOL = 0.4V
- TTL level Schmitt-triggered input pin VtVt+ ILIH ILIL 0.4 0.8 2.0 2.4 1 1 V V
A A
Input Low Threshold Voltage Input High Threshold Voltage Input High Leakage Input Low Leakage
VDD = 3.3V VDD = 3.3V VIN = VDD VIN = 0 V
9.3 AC Characteristics
t SCL tR
tR
SCL
t HD;SDA
t SU;DAT t SU;STO
SDA IN VALID DATA
t HD;DAT
SDA OUT
Serial Bus Timing Diagram
Serial Bus Timing
PARAMETER SCL clock period Start condition hold time Stop condition setup-up time DATA to SCL setup time DATA to SCL hold time SCL and SDA rise time SCL and SDA fall time SYMBOL t-SCL tHD;SDA tSU;STO tSU;DAT tHD;DAT tR tF MIN. 0.5 0.5 0.5 50 50 0.4 0.4 MAX. 10000 UNIT uS uS uS nS nS uS uS
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10 Ordering Information
Part Number F75386M F75386SG Package Type 8 pin MSOP Green Package 8 pin SOP Green Package Production Flow Commercial, 0C to +70C Commercial, 0C to +70C
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11 Package Dimensions
(F75386M 8-MSOP Package )
8
5
c
E
HE
L
1
D
4
0.25 O
A Y SEATING PLANE b e A1 GAUGE PLANE
Control demensions are in milmeters .
SYMBOL A A1 b c E D e HE Y L DIMENSION IN MM MAX. MIN. 1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 3.80 4.00 4.80 5.00 1.27 BSC 6.20 5.80 0.10 0.40 1.27 0 10 DIMENSION IN INCH MIN. MAX. 0.053 0.069 0.010 0.004 0.020 0.013 0.010 0.008 0.157 0.150 0.188 0.196 0.050 BSC 0.228 0.016 0 0.244 0.004 0.050 10
(F75386SG 8-SOP Package )
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Feature Integration Technology Inc.
Headquarters 3F-7, No 36, Tai Yuan St., Chupei City, Hsinchu, Taiwan 302, R.O.C. TEL : 886-3-5600168 FAX : 886-3-5600166 Taipei Office Bldg. K4, 7F, No.700, Chung Cheng Rd., Chungho City, Taipei, Taiwan 235, R.O.C. TEL : 866-2-8227-8027 FAX : 866-2-8227-8037
P l
www: http://www.fintek.com.tw
Please note that all datasheet and specifications are subject to change without notice. All the trade marks of products and companies mentioned in this datasheet belong to their respective owner.
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12
Application Circuit
VCC3V
Example 1:
TEMPERATURE MONITOR (CPU THERMAL DIODE) THERDA
C1 3300pF D1+ THERM#/PWM AGND ALERT#/TACH R4 4.7K R5 4.7K
If use THERM# and ALERT#
VCC3V C2 0.1u R2 4.7K R3 4.7K
THERDC
U1 D1+ D2+ THERM#/PWM 1 2 3 4 VCC SCLK D1+ SDAT D2+ ALERT#/TACH THERM#/PWM GND F75386 8 7 6 5 SCLK SDATA
Example 2:
TEMPERATURE MONITOR (2N3906)
D1+ VCC3V Q1 2N3906 C3 3300pF R18 AGND R25 10K R19
ALERT#/TACH AGND
+12V 4.7K 4.7K Q2 PNP D1 C8 + 47U JP1 3 2 1 CON3
R20 4.7K R22 27K ALERT#/TACH R24 10K C10 0.1U
THERM#/PWMR23 +12V
330
Q3 NMOS
D2 R21 4.7K JP2 3 2 1 CON3 C11 0.1U
FAN Circuit for High PWM Frequency
R30 27K ALERT#/TACH R28 10K
VCC3V THERM#/PWM
R27 470 R26 10 Q4 NPN
Title
FAN Circuit for Low PWM Frequency
Size A Date:
Feature Integration Technology Inc. Document Number F75386 Application Circuit Tuesday , February 15, 2005 Sheet 1 of 1 Rev 0.1
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