G771 Datasheet, PDF (1/15 Pages) Global Mixed-mode Technology Inc – Two Remote Temperature Sensors with SMBus Serial Interface and System Reset Circuit

Global Mixed-mode Technology Inc.
G771
Two Remote Temperature Sensors with SMBus
Serial Interface and System Reset Circuit
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 Output
„Guaranteed RESET Valid to V_CC=1V
„Power Supply Transient Immunity
„No External Components needed for reset
function
„Small, 16-Pin SSOP Package
Applications
„Desktop and Notebook
„Central Office Computers
„Telecom Equipment
„Smart Battery Packs
„Test and Measurement
„LAN Servers
„Multi-Chip Modules
„Industrial Controls
General Description
The 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 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 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 (SMBus^TM) 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 allows the user to control
the supply-current drain.
Ordering Information
PART*
G771
TEMP. RANGE
-55°C to +125°C
PIN-PACKAGE
16SSOP
Pin Configuration
NC 1
Vcc 2
DXP1 ₃
DXN 4
DXP2 5
NC ₆
DGND 7
AGND 8
G771
16 TH_SHUT(push-pull)
15 NC
14 SMBCLK
13 NC
12 SMBDATA
11 ALERT
10 NC
9 RESET
16Pin SSOP
Ver 0.2 Preliminary
Dec 11, 2001
TEL: [phone]
http://www.gmt.com.tw
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