GMT G751 Digital temperature sensor and thermal watchdog with two-wire interface Datasheet

G751
Global Mixed-mode Technology Inc.
Digital Temperature Sensor and Thermal Watchdog
with Two-Wire Interface
General Description
Features
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The G751 is a temperature sensor, Delta-Sigma
analog-to-digital converter, and digital over- temperature detector with SMBus interface. The host
can query the G751 at any time to read temperature.
The open-drain Over temperature Shutdown (O.S.)
output becomes active when the temperature exceeds a programmable limit. This pin can operate in
either “Comparator” or “Interrupt” mode.
SMBus interface
Programmable Trip Point (TOS) and Hysteresis
(THYST)
Separate open-drain output pin operates as
interrupt or comparator at output
Register readback capability
Power up defaults permit stand-alone operation as thermostat
Shutdown mode to minimize power consumption
Up to 8 G751s can be connected to a single
bus
The host can program both the temperature alarm
threshold (TOS) and the temperature at which the
alarm condition goes away (THYST). In addition, the
host can read back the contents of the G751's TOS
and THYST registers. The sensor powers up in Comparator mode with default thresholds of 50°C TOS
45°C THYST. for G751-1 and 80°C TOS , 75°C THYST
for G751-2.
Key Specifications
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Supply Voltage
Supply Current
3.0V to 5.5V
280µA (typ)
1mA (max)
2µA(typ)
operating
shutdown
Temperature Accuracy
-25°C to 100°C
-55°C to 125°C
Ordering Information
±2°C (max)
±3°C (max)
ORDER
NUMBER
(Pb free/Green)
TOS THYST
PACKAGE
Applications
G751-1P1f
50°C/45°C
SOP-8
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G751-2P1f
80°C/75°C
SOP-8
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G751-2P8f
80°C/75°C
MSOP-8
G751-2RDf
80°C/75°C
TDFN3X3-8
System Thermal Management
Personal Computers
„ Office Electronics
„ Electronic Test Equipment
P1: SOP-8; P8: MSOP-8; RD: TDFN3X3-8
Pin Configuration
Typical Application Circuit
+VS 3V to 5.5V
G751
7
SMBDATA
1
8
+Vs SMBDATA
1
SMBCLK
2
7
A0
SMBCLK
2
O.S.
3
O.S.
GND
6
3
5
4
SOP-8/MSOP-8
Typical Bypass 0.1µF
(Unless mounted close
to Processor)
G751
A1
A2
GND
Thermal
Pad
8
+Vs
7
A0
6
A1
5
4
Address(Set as
desired)
A0
A1
8
6
5
G751
A2
1
A2
3
O.S. Out
To Processor
Interrupt Line
SMBDATA
Interface
2
SMBCLK
TDFN3X3-8
4
Note: Recommend connecting the Thermal Pad
to the Ground or let it keep floating.
O.S. Set for active low for
wire OR’d multiple
interrupt line
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 3.1
May 27, 2009
1
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