F75386SG

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. F75386 -I- July, 2007 V0.27P 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 F75386 -II- July, 2007 V0.27P F75386 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 F75386 -III- July, 2007 V0.27P F75386 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 F75386 -1- July, 2007 V0.27P F75386 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. F75386 -2- July, 2007 V0.27P F75386 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. F75386 -3- July, 2007 V0.27P F75386 (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 F75386 -4- July, 2007 V0.27P F75386 6.3 Typical Operating Characteristics (a) Temperature Error vs.D+/D- Capacitance Temperature error(℃) vs. D+/D- capacitance 0 ℃ Temperature error( -2 -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(℃) 3.5 Temperatureerror(℃) 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(℃) (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 F75386 -5- July, 2007 V0.27P F75386 (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 0°C to 126.75°C. The temperature format is as the following table: Temperature ( High Byte ) Digital Output Temperature ( Low Byte ) Digital Output 0°C 1°C 25°C 50°C 75°C 90°C 100°C 126°C 0000 0000 0000 0001 0001 1001 0011 0010 0100 1011 0101 1010 0110 0100 0111 1110 0°C 0.125°C 0.250°C 0.375°C 0.500°C 0.625°C 0.750°C 0.875°C 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 F75386 -6- July, 2007 V0.27P F75386 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). F75386 -7- July, 2007 V0.27P F75386 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 F75386 -8- July, 2007 V0.27P F75386 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 = 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) F75386 -9- July, 2007 V0.27P F75386 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 = 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 = 00h T1 = On-chip temperature sensor (Local) T3= Pin 3 external temperature sensor (Remote) F75386 -10- July, 2007 V0.27P F75386 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 = 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 = 08h Bit Name Attribute Description 7-0 CONV_RATE R/W Set conversion times per second. Value Conversion/Sec Value Conversion/Sec F75386 -11- July, 2007 V0.27P F75386 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 = 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 = 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. F75386 -12- July, 2007 V0.27P F75386 7.8 ALERT MASK Register 2 Index 17h Power on default = 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 = 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. F75386 -13- July, 2007 V0.27P F75386 7.10 FINTEK PWM Control Register  Index 31h (Fintek Mode) Power on default = 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 = 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 = 3Fh F75386 -14- July, 2007 V0.27P F75386 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 =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 =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) F75386 -15- July, 2007 V0.27P F75386 7.15 Lookup Table Hysteresis Register  Index 4Fh Power on default = 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 4°C ; 1LSB = 1°C) 7.16 Temperature vs. PWM Duty Lookup Table Registers  Index 50h to 5Fh Power on default = 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 = 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) F75386 -16- July, 2007 V0.27P F75386 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: F75386 -17- July, 2007 V0.27P F75386 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 1℃ corresponds to about 200µV. It means that a copper-solder thermocouple exhibits 3µV/℃, and takes about 200µV of the voltage error at D+ & Pin5 GND(D-) to cause a 1℃ measurement error. Adding a few thermocouples causes a negligible error. 5. Place a 0.1µF 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 Ω series resistance introduces about F75386 -18- July, 2007 V0.27P F75386 0.5℃ 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