G766 Datasheet, PDF (1/13 Pages) List of Unclassifed Manufacturers – Remote Temperature Sensor with SMBus Serial Interface

Global Mixed-mode Technology Inc.
G766
Remote Temperature Sensor with SMBus Serial
Interface
Features
„Single Channel: Measures Remote CPU Tem-
perature
„No Calibration Required
„SMBus 2-Wire Serial Interface
„Programmable Under/Overtemperature Alarms
„Supports SMBus Alert Response
„Accuracy:
±3°C (+60°C to +100°C, remote)
„3µA (typ) Standby Supply Current
„300µA (max) Supply Current in Auto- Convert
Mode
„+3V to +5.5V Supply Range
„Small, 10-Pin MSOP Package
Applications
Desktop and Notebook
Computers
Smart Battery Packs
LAN Servers
Industrial Controls
Central Office
Telecom Equipment
Test and Measurement
Multi-Chip Modules
Pin Configuration
General Description
The G766 is a precise digital thermometer that reports
the temperature of a remote sensor. The remote sen-
sor is a diode-connected transistor typically a low-cost,
easily mounted 2N3904 NPN type-that replace con-
ventional thermistors or thermocouples. Remote ac-
curacy is ±3°C for multiple transistor manufacturers,
with no calibration needed. The G766 can also meas-
ure the die temperature of other ICs, such as micro-
processors, 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 twos-complement format. Meas-
urements can be done automatically and autono-
mously, 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 sup-
ply-current drain.
The G766 is available in a small, 10-pin MSOP sur-
face-mount package.
Ordering Information
PART*
G766
TEMP. RANGE
-55°C to +125°C
PIN PACKAGE
10-MSOP
Typical Operating Circuit
ADD0 1
ADD1 2
GND ³
DXN 4
DXP 5
G766
10 ALERT
9 SMBDATA
8 SMBCLK
7 STBY
6 Vcc
2N3904
10 Pin MSOP
0.1 µF
3V TO 5.5V
200Ω
Vcc STBY
DXP
DXN
2200pF
SMBCLK
SMBDATA
ALERT
ADD0 ADD1 GND
10k EACH
CLOCK
DATA
INTERRUPT
TO ^µC
Ver 1.0
Dec 11, 2001
TEL: [phone]
http://www.gmt.com.tw
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