Features: Measures Two Remote Temperatures
No Calibration Required
SMBus 2-Wire Serial Interface
Programmable Under/Over-temperature Alarms
Programmable Thermal Shutdown Signal
Supports SMBus Alert Response
Accuracy: ±5°C (-40°C to + 125°C, remote)
±3°C (+60°C to + 100°C, remote)
4.5V to 5.5V Supply Range
Precision Monitoring of 5V Power-Supply Voltage
140ms Min Power-On Reset Pulse Width RESET</a>Output
Guaranteed RESET</a> Valid to VCC=1V
Power Supply Transient Immunity
No External Components needed for reset function
Small, 16-Pin SSOP Package Application-Desktop and Notebook
-Central Office Computers
-Telecom Equipment
-Smart Battery Packs
-Test and Measurement
-LAN Servers
-Multi-Chip Modules
-Industrial Controls
Pinout
SpecificationsVcc to GND.........................-0.3V to +6V
DXP1, DXP2 to GND.................0.3V to (Vcc + 0.3V)
DXN to GND.......................-0.3V to +0.8V
SMBCLK, SMBDATA, ALERTto GND...............-0.3V to +6V
SMBDATA,ALERTCurrent...............-1mA to +50mA
DXN Current...........................±1mA
ESD Protection (human body model)...............2000V
Continuous Power Dissipation (TA= +70°C) SSOP
(de-rate 8.30mW/°C above +70°C)..............667mW
Operating Temperature Range............-55°C to +125°C
Junction Temperature......................+150°C
Storage temperature Range..............-65°C to +165°C
Lead Temperature (soldering,10sec)..............+300°C DescriptionThe G771 contains a precise digital thermometer, a system-reset circuit, and a programmable thermal shutdown signal.
The thermometer reports the temperature of 2 remote sensors. The remote sensors of G771 are diode-connected transistors typically a low-cost, easily mounted 2N3904 NPN type that replace conventional thermis-tors or thermocouples. Remote accuracy is ±5°C for multiple transistor manufacturers, with no calibration needed. The remote channel of G771 can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor.
The 2-wire serial interface accepts standard System Management Bus (SMBusTM) Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit cor-responding to 1°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 of G771 allows the user to control the supply-current drain.
G771 Data Sheet
