G782 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – ±1C Remote and Local Temperature Sensor with SMBus Serial Interface

Global Mixed-mode Technology Inc.
G782
±1°C Remote and Local Temperature Sensor with
SMBus Serial Interface
Features
„ Three Channels: Measures Two Remote and
One Local Temperatures
„ Measure Thermal Diode with a Transistor Model
„ Support Single-Core, Dual-Core and Quad-Core
CPU Application
„ No Calibration Required
„ Built-in Noise-Buster for Remote Sensor
„ 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
„ Measure Thermal Diode with Transistor Model
„ Support 45nm, 65nm and 90nm CPU thermal
diode
„ +3V to +5.5V Supply Range
„ Small 8-Lead SOP , MSOP and TDFN Package
„ Remote Temperature Measurment up to 160°C
by using offset shifting method (see “Measure
Remote Temperature Higher Than 127°C” sec-
tion)
Applications
Desktop and Notebook
Computers
Smart Battery Packs
LAN Servers
Industrial Controllers
Central Office
Telecom Equipment
Test and Measurement
Multi-Chip Modules
General Description
The G782 is a precise digital thermometer that re-
ports the temperature of 2 remote sensors and its
own package. The remote sensors are diode-
connected transistors typically a low-cost, easily
mounted 2N3904 NPN type that replace conventional
thermistors or thermocouples. Remote accuracy is
±1°C with no calibration needed. It also has a
build-in noise filtering function in remote sensor
measuring the diode temperature. The remote chan-
nel 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) 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 sin-
gle-shot mode. The adjustable rate allows the user to
control the supply current drain.
The G782 is available in a small, 10-pin MSOP sur-
face-mount package.
Ordering Information
ORDER
NUMBER
G782P71U
Note:P7:MSOP-10
1: Bonding Code
U: Tape & Reel
Pin Configuration
MARKING
G782
TEMP.
RANGE
-55°C to +125°C
PACKAGE
(Green)
MSOP-10
Typical Application Circuit
VCC 1
DXP1 2
DXN1 3
DXP2 4
DXN2 5
G782
MSOP-10
10 SMBCLK
9 SMBDATA
8 ALERT
7 THERM
6 GND
0.1µF
3V TO 5.5V
CPU
VCC
DXP1
DXN1 SMBCLK
SMBDATA
DXP2
ALERT
DXN2
THERM
GND
10kΩ EACH
CLOCK
DATA
INTERRUPT TO µC
Ver: 1.4
Jun 29, 2010
TEL: [phone]
http://www.gmt.com.tw
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