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G781 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. G781
Description  ±1°C Remote and Local Temperature Sensor with SMBus Serial Interface
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Ver: 1.0
Oct 02, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
G781
±1°C Remote and Local Temperature Sensor with
SMBus Serial Interface
Features
Two Channels: Measures Both Remote and
Local Temperatures
No Calibration Required
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
+3V to +5.5V Supply Range
Small 8-Lead SO Package
Applications
Desktop and Notebook
Central Office
Computers
Telecom Equipment
Smart Battery Packs
Test and Measurement
LAN Servers
Multi-Chip Modules
Industrial Controllers
General Description
The G781 is a precise digital thermometer that reports
the temperature of both a remote sensor and its own
package. The remote sensor is a diode-connected
transistor typically a low-cost, easily mounted 2N3904
NPN type that replace conventional thermistors or
thermocouples. Remote accuracy is ±1°C with no cali-
bration needed. The remote channel 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) 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 cor-
responding 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.
The G781 is available in a small, 8-pin SOP sur-
face-mount package.
Ordering Information
PART*
TEMP. RANGE
PIN-PACKAGE
G781
-20°C to +120°C
8-SOP
Pin Configuration
Typical Operating Circuit
THERM
0.1µF
3V TO 5.5V
VCC
DXP
DXN
SMBCLK
SMBDATA
ALERT
10k
Ω EACH
CLOCK
DATA
INTERRUPT TO µC
GND
2200pF
2N3904
DXN
8
6
5
1
2
3
4
VCC
DXP
SMBDATA
SMBCLK
GND
8 Pin SOP
G781
7
ALERT
THERM
THERM
0.1µF
3V TO 5.5V
VCC
DXP
DXN
SMBCLK
SMBDATA
ALERT
10k
Ω EACH
CLOCK
DATA
INTERRUPT TO µC
GND
2200pF
2N3904
DXN
8
6
5
1
2
3
4
VCC
DXP
SMBDATA
SMBCLK
GND
8 Pin SOP
G781
7
ALERT
THERM


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