G782 Global Mixed-mode Technology Inc. ±1°C Remote and Local Temperature Sensor with SMBus Serial Interface Features General Description The G782 is a precise digital thermometer that reports the temperature of 2 remote sensors and its own package. The remote sensors are diodeconnected transistors typically a low-cost, easily mounted 2N3904 NPN type that replace conventional thermistors or thermocouples. Remote accuracy is ±1°C with no calibration needed. It also has a build-in noise filtering function in remote sensor measuring the diode temperature. The remote channel can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor. Three Channels: Measures Two Remote and One Local Temperatures Measure Thermal Diode with a Transistor Model Support Single-Core, Dual-Core and Quad-Core CPU Application No Calibration Required Built-in Noise-Buster for Remote Sensor SMBus 2-Wire Serial Interface Programmable Under/Overtemperature Alarms Supports SMBus Alert Response Accuracy: ±1°C (+60°C to +100°C, remote) ±3°C (+60°C to + 100°C, local) 320µA (typ) Average Supply Current During Conversion Measure Thermal Diode with Transistor Model Support 45nm, 65nm and 90nm CPU thermal diode +3V to +5.5V Supply Range Small 8-Lead SOP , MSOP and TDFN Package Remote Temperature Measurment up to 160°C by using offset shifting method (see “Measure Remote Temperature Higher Than 127°C” section) The 2-wire serial interface accepts standard System Management Bus (SMBus) Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read temperature data. The data format is 11bits plus sign, with each bit corresponding to 0.125°C, in two’s-complement format. Measurements can be done automatically and autonomously, with the conversion rate programmed by the user or programmed to operate in a single-shot mode. The adjustable rate allows the user to control the supply current drain. Applications Desktop and Notebook Computers Smart Battery Packs LAN Servers Industrial Controllers The G782 is available in a small, 10-pin MSOP surface-mount package. Central Office Telecom Equipment Test and Measurement Multi-Chip Modules Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G782P71U G782 -55°C to +125°C MSOP-10 Note:P7:MSOP-10 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit 3V TO 5.5V 0.1µF G782 CPU SMBCLK VCC 10kΩ EACH VCC 1 10 DXP1 2 9 SMBDATA DXN1 3 8 ALERT DXP2 4 7 THERM DXP2 ALERT 6 GND DXN2 THERM GND DXN2 5 DXP1 DXN1 SMBCLK SMBDATA CLOCK DATA INTERRUPT TO µC MSOP-10 Ver: 1.4 Jun 29, 2010 TEL: 886-3-5788833 http://www.gmt.com.tw 1