F75385M ±1oC Accuracy Temperature Sensor IC Datasheet Release Date: July, 2006 Revision: V0.21P F75385 F75385 Datasheet Revision History Version Date Page 0.20P March, 2006 - 0.21P July, 2006 10 Revision History Original Release Version Modify VT1/VT2 High Limit and VT1 THERM Limit Default Value. Original (64h) Æ New (55h) 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. F75385 -I- July, 2006 F75385 Table of Contents General Description................................................................................................................. 1 Features .................................................................................................................................. 1 Key Specifications ................................................................................................................... 2 Pin Configuration..................................................................................................................... 2 Pin Descriptions ...................................................................................................................... 2 Functional Description............................................................................................................. 3 6.1 General Description.......................................................................................................... 3 6.2 The warning message ...................................................................................................... 3 6.3 Access Interface............................................................................................................... 3 6.4 Temperature Monitoring ..................................................................................................... 4 6.5 Alert#................................................................................................................................ 5 6.5 THERM# ............................................................................................................................ 5 6.6 ADC Conversion Sequence ............................................................................................... 6 6.7 Thermal Mass and Self Heating......................................................................................... 6 6.8 ADC Noise Filtering ........................................................................................................... 6 6.9 PCB Layout Guide ............................................................................................................. 6 7. Registers Description .............................................................................................................. 8 1. 2. 3. 4. 5. 6. 7.1 Configuration Register Index 03h(Read), 09h(Write)................................................... 8 7.2 Status Register Index 02h .............................................................................................. 8 7.3 Conversion Rate Register Index 04h(Read), 0Ah(Write)................................................ 8 7.4 One-Shot Register Index 0Fh......................................................................................... 9 7.5 Alert Queue & Timeout Register Index 22h .................................................................... 9 7.6 Status-with-ARA Control Register Index 24h ............................................................... 9 7.7 Chip ID I Register Index 5Ah........................................................................................ 10 7.8 Chip ID II Register Index 5Bh....................................................................................... 10 7.9 Vendor ID I (Manufacturer ID) Register Index 5Dh....................................................... 10 7.10 Vendor ID I (Manufacturer ID) Register Index 5Eh ..................................................... 10 7.11 Vendor ID II (Manufacturer ID) Register Index FEh .................................................... 10 7.12 Value RAM Index 10h- 2Fh ........................................................................................ 10 8. Electrical characteristic.......................................................................................................... 12 8.1 Absolute Maximum Ratings .............................................................................................. 12 8.2 DC Characteristics ............................................................................................................ 12 8.3 AC Characteristics ............................................................................................................ 13 9. Ordering Information ............................................................................................................. 13 10. Package Dimensions (8 MSOP)............................................................................................ 14 F75385 -II- July, 2006 1. General Description The F75385 is a temperature sensor IC with alert signal which is specific designed for notebook, graphic cards etc. An 11-bit analog-to-digital converter (ADC) was built inside F75385. The F75385 can monitor two set of temperature which is very important for the system to work stably and properly. This chip provides 1 remote temperature sensor and 1 local temperature sensor. The remote temperature sensor can be performed by CPU thermal diode or transistor 2N3906. The users can set up the upper and lower limits (alarm thresholds) of all monitored parameters and this chip can also issue warning messages for system protection when there is something wrong with monitored items. 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 application software could be Fintek's application utility, or other management application software. The F75385 is in the package of 8-pin MSOP and powered by 3.3V. 2. Features Provide 1 on-chip local and 1 remote temperature sensing ±1 oC accuarcy on remote channel and ±3 oC accuarcy on local channel ±1 oC (+60 oC to +100 oC, remote) ±3 oC (+60 oC to +100 oC, local) 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 Programmable limited and setting points(alert threshold) for all monitored items 2 wire SMBus interface 3VCC operation and in 8-MSOP package The SMBus slave address: F75385 A6 A5 A4 A3 A2 A1 A0 1 0 0 1 1 0 0 --Patented: TW 235231-- -1- July 2006 V0.21P 3. Key Specifications 4. Supply Voltage 3.0~3.6V Supply Current 180 uA (typ) Measured Range 0 ~ 145 oC Remote Diode Temperature Accuracy ±1oC from +60oC to +100oC Local Temperature Accuracy ±3oC from +60oC to +100oC Pin Configuration 5. VCC 1 D+ 2 D- 3 THERM# 4 F75382 F75385M 8 SCL 7 SDA 6 ALERT# 5 GND Pin Descriptions OD12 - Open-drain output pin with 12 mA sink capability PWR - Power pin INts - TTL level input pin and schmitt trigger AIN - Input pin(Analog) PIN NO PIN NAME TYPE PWR DESCRIPTION PWR 3VCC Power Pin 1 VCC 2 D+ AIN 3VCC Positive connection to remote temperature sensor (ex: thermal diode anode) 3 D- AIN 3VCC Negative connection to remote temperature sensor(ex: thermal diode cathode) 4 THERM# OD12 3VCC Active LOW output. This pin will be logic low when the temperature exceeds o its limit. (Default 108 C enable) 5 GND PWR 3VCC Ground 6 ALERT# OD12 3VCC Active LOW output. Used as SMBus alert or Interrupt 7 SDA INts/OD12 3VCC Serial bus data 8 SCL INt s 3VCC Serial bus clock -2- July 2006 V0.21P 6. Functional Description 6.1 General Description The F75385 is a simple temperature sensor with warning signal output. It includes a local and a remote temperature sensor. Both measured temperature are compared with its high, low and THERM limits which are stored in the registers. When one or more out-of-limit events occur, the flags in Status Register will be set and that may cause ALERT output to low. Also, measured temperature exceeding THERM limit may cause THERM output to low. 6.2 The warning message Pin4 and pin6 act as warning message when the temperature exceeds it threshold point. 6.3 Access Interface The F75385 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 F75385 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. F75385 supports 25ms timeout for no activity on the SMBus. This timeout function is programmed at 22h bit7 and default is disabled. F75385 also supports Alert Response Address (ARA) protocol. The operation of the protocol is described with details in the following sections. (a) SMBus write to internal address register followed by the data byte 0 7 8 0 7 8 SCL SDA 1 Start By Master 0 0 1 1 0 0 R/W D7 Ack by 382 Frame 1 Serial Bus Address Byte D6 D5 D4 D3 D2 D1 D0 Ack by 382 Frame 2 Internal Index Register Byte 0 7 8 SCL (Continued) SDA (Continued) D7 D6 D5 D4 D3 D2 D1 D0 Stop by Master Frame 3 Data Byte Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte -3- July 2006 V0.21P (b) Serial bus write to internal address register only 0 7 8 0 7 8 SCL SDA 1 0 0 Start By Master 1 1 0 0 R/W D7 D6 Ack by 382 Frame 1 Serial Bus Address Byte D5 D4 D3 D2 D1 D0 Ack by 382 Frame 2 Internal Index Register Byte Stop by Master 0 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 7 8 0 7 8 SCL 1 SDA 0 Start By Master 0 1 1 0 0 R/W D7 D6 Ack by 382 Frame 1 Serial Bus Address Byte D5 D4 D3 D2 D1 D0 Ack by Master Frame 2 Internal Index Register Byte Stop by Master 0 Figure 3. Serial Bus Read from Internal Address Register (d) Alert Response Address 0 7 8 0 7 8 SCL 0 SDA Start By Master 0 0 1 1 0 0 R/W 0 1 0 Ack by 382 Frame 1 Alert Response Address 0 1 Frame 2 Device Address 1 0 0 Ack by Master Stop by Master 0 Figure 4. Alert Response Address 6.4 Temperature Monitoring The F75385 monitors a local and a remote temperature sensor. Both can be measured from 0°C to 145°C. The temperature format is as the following table: Temperature ( High Byte ) Digital Output Temperature ( Low Byte ) Digital Output 0°C 0000 0000 0°C 000 0 0000 1°C 0000 0001 0.125°C 001 0 0000 25°C 0001 1001 0.250°C 010 0 0000 50°C 0011 0010 0.375°C 011 0 0000 75°C 0100 1011 0.500°C 100 0 0000 90°C 0101 1010 0.625°C 101 0 0000 -4- July 2006 V0.21P 100°C 0110 0100 0.750°C 110 0 0000 145°C 1001 0001 0.875°C 111 0 0000 Remote-sensor transistor manufacturers Manufacturer Model Number Panasonic 2SB0709 2N3906 Philips PMBT3906 6.5 Alert# Five events can trigger ALERT# to low: (1). VT1(Local) temperature exceeds High Limit (2). VT1(Local) temperature goes below Low Limit (3). VT2(Remote) temperature exceeds High Limit (4). VT2(Remote) temperature goes below Low Limit (5). VT2(Remote) temperature is Open-circuit. These five events are wired-NOR together. This means that when one of out-of-limit event occurs, the ALERT# output goes low if the MASK control is disabled. ALERT# signal can be used as an IRQ-like interrupt or as an SMBALERT. When ALERT# acts as an IRQ-like interrupt, the ALERT# will be de-asserted until the following 2 conditions are matched: (1). The abnormal condition is gone (2). Reading the Status register to clear the status When ALERT# acts as a SMBALERT, the ALERT# will be de-asserted until the following 3 conditions are matched: (1). The abnormal condition is gone (2). Reading the Status register to clear the status (3). The ALERT# has been serviced by the SMBus master reading the device address. For more information about SMBALERT, please see SMBus 1.1 specification. 6.6 THERM# Either VT1(Local) or VT2(Remote) temperature exceeds the corresponding THERM limit, the THERM# output will assert low. The asserted output will be de-asserted until the temperature goes below (THERM Limit – Hysteresis). The hysteresis default value is 10°C and it can be programmed. Both VT1 and VT2 have their own THERM limits and -5- July 2006 V0.21P Hysteresis values. 6.7 ADC Conversion Sequence If a START command is written, both channels are converted and the results of both measurements are available after the end of conversion. A BUSY status bit in the status byte shows that the device is actually performing a new conversion; however, even if the ADC is busy, the results of the previous conversion are always available. 6.8 Thermal Mass and Self Heating Thermal mass effect can seriously degrade effective accuracy of the F75385. The thermal time constant of the SOP package is about 140 in still air. For the F75385 junction temperature to settle to within +1°C after a sudden +100°C change requires about five time constants or 12 minutes. The use of smaller packages for remote sensors such as SOT23, improves the situation. Take care to account for thermal gradients between the heat source and the sensor package do not interfere with measurement accuracy. Sel-heating does not significantly affect measurement accuracy. Remote sensor self-heating due to the diode current source is negligible. For the local diode, the worst case error occurs when auto-converting at the fastest rate and simultaneously sinking maximum current at the ALERT# output. For instance, at an 64Hz rate and ALERT# sink around 0.7mA when pull up resistor 4.7K ohm to 3.3VCC, the typical power dissipation is VCC x 220 uA plus 0.4V x 0.7mA. Package θJA is about 120 °C/W, so with VCC = 3.3V and no copper PC board heat-sinking, the resulting temperature rise is: dT = 1.01mW x 120 °C/W = 0.12 °C Even with these contrived circumstances, it is difficult to introduce significant self-heating errors. 6.9 ADC Noise Filtering The ADC is integrating type with inherently good noise rejection. Micro-power operation places constraints on high-frequency noise rejection; therefore, careful PCB board layout and suitable external filtering are required for high-accuracy remote measurement in electronically noisy environment. High frequency EMI is best filtered at D+ and D- with an external 2200pF capacitor. Too high capacitance may introduce errors due to the rise time of the switched current source. Nearly all noise sources tested cause the ADC measurement to be higher than the actual temperature, depending on the frequency and amplitude. 6.10 PCB Layout Guide PCB can be electrically noisy environments, and the F75385 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: -6- July 2006 V0.21P 1. Place the F75385 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, power control circuit, CRTs, memory buses and PCI/ISA bus etc. 2. Route the D+ and 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+ & 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 DXP 10MILS DXN 10MILS MINIMUM 10MILS GND 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 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+ & 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 2200pF input filter capacitors across D+, D- close to the F75385. 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 0.5℃ error. -7- July 2006 V0.21P 7. Registers Description 7.1 Configuration Register Index 03h(Read), 09h(Write) Power on default <7:0> = 00h Bit Name Attribute Description 7 ALERT_MASK R/W Set to 1, mask ALERT# signal output. 6 RUN_STOP R/W Set to 0, monitor. 5-0 Reserved Set to 1, stop to monitor(software power down). 7.2 Status Register Index 02h Power on default <7:0> = 00h Bit Name Attribute Description 7 ADC_BUSY RO Set to 1, ADC is converting. 6 VT1HIGH RO Set to 1, VT1 temperature exceeds high limit. Set to 0, VT1 temperature does not exceed high limit. 5 VT1LOW RO Set to 1, VT1 temperature goes below low limit. Set to 0, VT1 temperature does not goes below low limit. 4 VT2HIGH RO Set to 1, VT2 temperature exceeds high limit. Set to 0, VT2 temperature does not exceed high limit. 3 VT2LOW RO Set to 1, VT2 temperature goes below low limit. Set to 0, VT2 temperature does not goes below low limit. 2 OPEN RO Set to 1, VT2 is open-circuit. 1 VT2THERM RO Set to 1, VT2 temperature exceeds its THERM limit. 0 VT1THERM RO Set to 1, VT1 temperature exceeds its THERM limit. VT1(Local) ; VT2(Remote) 7.3 Conversion Rate Register Index 04h(Read), 0Ah(Write) Power on default <7:0> = 08h Bit Name Attribute 7-0 CONV_RATE R/W Description Set conversion times per second. Value Conversion/Sec -8- Value Conversion/Sec July 2006 V0.21P 00h 0.0625 06h 4 01h 0.125 07h 8 02h 0.25 08h 16 03h 0.5 09h 32 04h 1 0Ah 64 05h 2 0Bh ~ FFh Reserved 7.4 One-Shot Register Index 0Fh Power on default <7:0> = xxh Bit 7-0 Name ONE-SHOT Attribute Description WO When F75385 is at standby mode, writing any value to this register will initiate a single conversion and comparison cycle. After the single cycle, F75385 will returns to standby mode. 7.5 Alert Queue & Timeout Register Index 22h Power on default <7:0> = 01h Bit Name Attribute 7 EN_I2CTMOUT R/W Description Set to 1, enable serial interface timeout function. (Timeout time = 25ms) Set to 0, disable. 6-4 Reserved 3-1 ALERT_QUEUE R/W This number determines how many abnormal measurements must occur before ALERT signal is generated. 000 : Once 001 : Twice 011 : 3 times 111 : 4 times 0 Reserved RO Always read 1. 7.6 Status-with-ARA Control Register Index 24h Power on default <7:0> = 01h Bit Name 7-6 Reserved Attribute Description -9- July 2006 V0.21P 0 EN_ARA_STS R/W Set to 1, ALERT de-asserted condition is related with ARA. Set to 0, ALERT de-asserted condition is not related with ARA(Alert Response Address). 7.7 Chip ID I Register Index 5Ah Power on default: 03h. 7.8 Chip ID II Register Index 5Bh Power on default: 03h. 7.9 Vendor ID I (Manufacturer ID) Register Index 5Dh Power on default: 19h. 7.10 Vendor ID I (Manufacturer ID) Register Index 5Eh Power on default: 34h. 7.11 Vendor ID II (Manufacturer ID) Register Index FEh Power on default: 23h. (programmable) 7.12 Value RAM Index 10h- 2Fh VT1 : Local Temperature VT2 : Remote Temperature The value in quota is its power-on default value. Description Attribute Read Address Read Address Write Address Write Address (High Byte) (Low Byte) (High Byte) (Low Byte) VT1 reading RO 00h 1Ah VT2 reading RO 01h 10h VT1 High Limit R/W 05h (55h) 1Bh (00h) 0Bh 1Bh VT1 Low Limit R/W 06h (00h) 1Ch (00h) 0Ch 1Ch VT2 High Limit R/W 07h (55h) 13h (00h) 0Dh 13h -10- July 2006 V0.21P VT2 Low Limit R/W 08h (00h) 14h (00h) VT1 THERM Limit R/W 20h (55h) 20h VT1 THERM Hysteresis R/W 21h (0Ah) 21h VT2 THERM Limit R/W 19h (6Ch) 19h VT2 THERM Hysteresis R/W 23h (0Ah) 23h -11- 0Eh 14h July 2006 V0.21P 8. Electrical characteristic 8.1 Absolute Maximum Ratings PARAMETER RATING UNIT -0.5 to 3.3 V -0.5 to VDD+0.5 V Operating Temperature 0 to +140 °C Storage Temperature -55 to 150 °C Power Supply Voltage Input Voltage Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device 8.2 DC Characteristics (TA = 0° C to 70° C, VDD = 3.3V ± 10%, VSS = 0V ) Parameter Temperature Error, Remote Diode Conditions o MIN TYP o ±1 60 C < TD < 100 C, VCC = 3.0V to 3.6V o o o o 0 C < TA < 100 C, VCC = 3.0V to 3.6V Supply Voltage range Average operating supply current 3.0 16 Conversions / Sec Rate 0.0625 Conversions / Sec Rate Standby supply current ±3 3.3 3.6 o C VDD input, Disables ADC , Rising Edge o C V 180 uA 90 uA uA o 0.125 C 2.55 Power on reset threshold Diode source current ±1 10 Resolution Under-voltage lockout threshold Unit ±3 0 C <TD < 60 C Temperature Error, Local Diode MAX 2.2 V 2.4 V High Level 95 uA Low Level 10 uA (TA = 0° C to 70° C, VDD = 3.3V ± 10%, VSS = 0V) PARAMETER SYM. MIN. TYP. MAX. UNIT CONDITIONS mA VOL = 0.4V OD12 - Open-drain output pin with sink capability of 16 mA Output Low Current INts - IOL 9 12 TTL level Schmitt-triggered input pin -12- July 2006 V0.21P Input Low Threshold Voltage Vt- 0.5 0.8 1.1 V VDD = 3.3V Input High Threshold Voltage Vt+ 1.6 2.0 2.4 V VDD = 3.3V Input High Leakage ILIH +1 µA VIN = VDD Input Low Leakage ILIL µA VIN = 0 V -1 8.3 AC Characteristics t SCL tR tR SCL t HD;SDA t SU;STO t SU;DAT SDA IN VALID DATA t HD;DAT SDA OUT Serial Bus Timing Diagram Serial Bus Timing PARAMETER SYMBOL MIN. t-SCL 10 uS Start condition hold time tHD;SDA 4.7 uS Stop condition setup-up time tSU;STO 4.7 uS DATA to SCL setup time tSU;DAT 120 nS DATA to SCL hold time tHD;DAT 5 nS SCL and SDA rise time tR 1.0 uS SCL and SDA fall time tF 300 nS SCL clock period MAX. UNIT 9. Ordering Information Part Number Package Type Production Flow F75385M 8 pin MSOP (Green Package) Commercial, 0°C to +70°C -13- July 2006 V0.21P 10. Package Dimensions (8 MSOP) Feature Integration Technology Inc. Headquaters Taipei Office 7F, No 31, Shintai Rd., Bldg. K4, 7F, No.700, Jungjeng Rd., Junghe Jubei City, Hsinchu 302, Taiwan, R.O.C. City, Taipei, Taiwan 235, R.O.C. TEL : 886-3-6562727 TEL : 886-2-8227-8027 FAX : 886-3-6560537 FAX : 886-2-8227-8037 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 -14- July 2006 V0.21P