G751 Global Mixed-mode Technology Inc. Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface General Description Features The G751 is a temperature sensor, Delta-Sigma analog-to-digital converter, and digital over- temperature detector with SMBus interface. The host can query the G751 at any time to read temperature. The open-drain Over temperature Shutdown (O.S.) output becomes active when the temperature exceeds a programmable limit. This pin can operate in either “Comparator” or “Interrupt” mode. SMBus interface Programmable Trip Point (TOS) and Hysteresis (THYST) Separate open-drain output pin operates as interrupt or comparator at output Register readback capability Power up defaults permit stand-alone operation as thermostat Shutdown mode to minimize power consumption Up to 8 G751s can be connected to a single bus The host can program both the temperature alarm threshold (TOS) and the temperature at which the alarm condition goes away (THYST). In addition, the host can read back the contents of the G751's TOS and THYST registers. The sensor powers up in Comparator mode with default thresholds of 50°C TOS 45°C THYST. for G751-1 and 80°C TOS , 75°C THYST for G751-2. Key Specifications Supply Voltage Supply Current 3.0V to 5.5V 280µA (typ) 1mA (max) 2µA(typ) operating shutdown Temperature Accuracy -25°C to 100°C -55°C to 125°C Ordering Information ±2°C (max) ±3°C (max) ORDER NUMBER (Pb free/Green) TOS THYST PACKAGE Applications G751-1P1f 50°C/45°C SOP-8 G751-2P1f 80°C/75°C SOP-8 G751-2P8f 80°C/75°C MSOP-8 G751-2RDf 80°C/75°C TDFN3X3-8 System Thermal Management Personal Computers Office Electronics Electronic Test Equipment P1: SOP-8; P8: MSOP-8; RD: TDFN3X3-8 Pin Configuration Typical Application Circuit +VS 3V to 5.5V G751 7 SMBDATA 1 8 +Vs SMBDATA 1 SMBCLK 2 7 A0 SMBCLK 2 O.S. 3 O.S. GND 6 3 5 4 SOP-8/MSOP-8 Typical Bypass 0.1µF (Unless mounted close to Processor) G751 A1 A2 GND Thermal Pad 8 +Vs 7 A0 6 A1 5 4 Address(Set as desired) A0 A1 8 6 5 G751 A2 1 A2 3 O.S. Out To Processor Interrupt Line SMBDATA Interface 2 SMBCLK TDFN3X3-8 4 Note: Recommend connecting the Thermal Pad to the Ground or let it keep floating. O.S. Set for active low for wire OR’d multiple interrupt line TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 3.1 May 27, 2009 1