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G786 Datasheet(PDF) 1 Page - Global Mixed-mode Technology Inc

Part # G786
Description  짹1C Remote and Local Temperature Sensor with SMBus Serial Interface
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Manufacturer  GMT [Global Mixed-mode Technology Inc]
Direct Link  http://www.gmt.com.tw
Logo GMT - Global Mixed-mode Technology Inc

G786 Datasheet(HTML) 1 Page - Global Mixed-mode Technology Inc

  G786 Datasheet HTML 1Page - Global Mixed-mode Technology Inc  
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Ver: 0.3
Apr 29, 2009
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
G786
±1°C Remote and Local Temperature Sensor with
SMBus Serial Interface
Features
Two Channels: Measures Both Remote and
Local Temperatures
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
+3V to +5.5V Supply Range
Small 8-Lead SOP and MSOP 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
Central Office
Computers
Telecom Equipment
Smart Battery Packs
Test and Measurement
LAN Servers
Multi-Chip Modules
Industrial Controllers
General Description
The G786 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 tran-
sistor typically a low-cost, easily mounted 2N3904 NPN
type that replace conventional thermistors or thermo-
couples. 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 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) 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 G786 and G786-1 have the same functions but
different SMBus slave addresses. This allows for one
of each to be on the bus at the same time.
The G786 is available in a small, 8-pin SOP and
MSOP surface-mount package.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G786P11U
G786
-55°C to +125°C
SOP-8
G786P81U
G786
-55°C to +125°C
MSOP-8
G786-1P81U
G786-1
-55°C to +125°C
MSOP-8
Note:P1:SOP-8
P8:MSOP-8
1: Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
THERM
*DXN
8
6
5
1
2
3
4
VCC
DXP
SMBDATA
SMBCLK
GND
SOP-8/MSOP-8
G786/G786-1
7
ALERT
0.1µF
3V TO 5.5V
VCC
DXP
DXN
SMBCLK
SMBDATA
ALERT
10k
Ω EACH
CLOCK
DATA
INTERRUPT TO µC
GND
2200pF
2N3904
THERM
*: DXN : DXN is internally connected to GND.
THERM
*DXN
8
6
5
1
2
3
4
VCC
DXP
SMBDATA
SMBCLK
GND
SOP-8/MSOP-8
G786/G786-1
7
ALERT
0.1µF
3V TO 5.5V
VCC
DXP
DXN
SMBCLK
SMBDATA
ALERT
10k
Ω EACH
CLOCK
DATA
INTERRUPT TO µC
GND
2200pF
2N3904
THERM
*: DXN : DXN is internally connected to GND.


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