Global Mixed-mode Technology Inc.
G751
Digital Temperature Sensor and Thermal Watchdog
with Two-Wire Interface
General Description
Features
The G751 is a temperature sensor, Delta-Sigma
analog-to-digital converter, and digital over- tem-
perature 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 ex-
ceeds 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 opera-
tion as thermostat
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 Com-
parator mode with default thresholds of 50°C TOS
45°C THYST. for G751-1 and 80°C TOS , 75°C THYST
for G751-2.
Shutdown mode to minimize power con-
sumption
Up to 8 G751s can be connected to a single
bus
Key Specifications
Supply Voltage
Supply Current
3.0V to 5.5V
280µA (typ)
1mA (max)
2µA(typ)
operating
shutdown
Ordering Information
Temperature Accuracy
-25°C to 100°C ±2°C (max)
-55°C to 125°C ±3°C (max)
ORDER
ORDER
NUMBER
NUMBER
(Pb free)
G751-1P1f
G751-2P1f
G751-2P8f
T
OS THYST
PACKAGE
G751-1P1
G751-2P1
G751-2P8
50°C/45°C
80°C/75°C
80°C/75°C
80°C/75°C
SOP-8
SOP-8
Applications
System Thermal Management
Personal Computers
Office Electronics
MSOP-8
TDFN3X3-8
G751-2RD G751-2RDf
Electronic Test Equipment
P1: SOP-8; P8: MSOP-8; RD: TDFN3X3-8
Pin Configuration
Typical Application
+VS 3V to 5.5V
Typical Bypass 0.1µF
(Unless mounted close
to Processor)
G751
G751
8
7
A0
6
+Vs
SMBDATA
1
2
3
1
2
3
4
8
8
+Vs
A0
SMBDATA
Address(Set as
A1
A2
desired)
5
A0
A1
A2
SMBCLK
O.S.
7
6
5
7
6
5
3
SMBCLK
O.S.
To Processor
Interrupt Line
Thermal
Pad
G751
O.S. Out
A1
1
2
SMBDATA
SMBCLK
Interface
GND
A2
4
GND
4
O.S. Set for active low for
wire OR’d multiple
interrupt line
SOP-8/MSOP-8
TDFN3X3-8
Note: Recommend connecting the Thermal Pad to the GND or let it keep floating.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 2.7
Dec 23, 2005
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