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What is G766?

This electronic component, produced by the manufacturer "ETC", performs the same function as "Remote Temperature Sensor with SMBus Serial Interface".


G766 Datasheet PDF - ETC

Part Number G766
Description Remote Temperature Sensor with SMBus Serial Interface
Manufacturers ETC 
Logo ETC Logo 


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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 (SMBusTM) 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: 886-3-5788833
http://www.gmt.com.tw
1

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G766 equivalent
Global Mixed-mode Technology Inc.
DXP
DXN
ALERT
VCC
MUX
+
REMOTE
+ LOCAL
+ ADC
DIODE
FAULT
8 REMOTE TEMPERATURE
DATA REGISTER
8
HIGH-TEMPETATURE
THRESHOLD (REMOTE HIGH)
LOW-TEMPETATURE
THRESHOLD (REMOTE LOW)
DIGITAL COMPARATOR
(REMOTE)
STBY ADD0 ADD1
2
CONTROL
LOGIC
ADDRESS
DECODER
7
SMBUS
READ WRITE
88
COMMAND BYTE
(INDEX) REGISTER
STATUS BYTE
REGISTER
CONFIGURATION
BYTE REGISTER
CONVERSION RATE
REGISTER
QS
R
SELECTED VIA
SLAVE ADD = 0001 100
ALERT RESPONSE
ADDRESS REGISTER
G766
SMBDATA
SMBCLK
Figure 1. Functional Diagram
A/D Conversion Sequence
If a Start command is written (or generated automati-
cally in the free-running auto-convert mode), both
channels are converted, and the results of both meas-
urements are available after the end of conversion. A
BUSY status bit in the status byte shows that the de-
vice is actually performing a new conversion; however,
even if the ADC is busy, the results of the previous
conversion are always available.
Remote-Diode Selection
Temperature accuracy depends on having a
good-quality, diode-connected small-signal transistor.
Accuracy has been experimentally verified for all of the
devices listed in Table 1. The G766 can also directly
measure the die temperature of CPUs and other inte-
grated circuits having on-board temperature-sensing
diodes.
The transistor must be a small-signal type with a rela-
tively high forward voltage; otherwise, the A/D input
voltage range can be violated. The forward voltage
must be greater than 0.25V at 10µA; check to ensure
this is true at the highest expected temperature. The
forward voltage must be less than 0.95V at 100µA;
check to ensure this is true at the lowest expected
temperature. Large power transistors don’t work at all.
Also, ensure that the base resistance is less than
100. Tight specifications for forward-current gain
(+50 to +150, for example) indicate that the manufac-
turer has good process controls and that the devices
have consistent VBE characteristics.
Ver 1.0
Dec 11, 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for G766 electronic component.


Information Total 13 Pages
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