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
ꢀSMBus interface
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.
ꢀ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 consump-
tion
ꢀ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
-55°C to 125°C
±2°C (max)
±3°C (max)
TRANSPORT
PART
TOS THYST
PACKAGE
8 SOP
MEDIA
2500 Units on Tape
and Reel
G751-1P1
50°C/45°C
Applications
ꢀSystem Thermal Management
ꢀPersonal Computers
2500 Units on Tape
G751-2P1 80°C /75°C
8 SOP
and Reel
ꢀOffice Electronics
2500 Units on Tape
and Reel
G751-2P8 80°C /75°C
P1: 8 SOP; P8: 8 MSOP
8 MSOP
ꢀElectronic Test Equipment
Pin Configuration
Typical Application
+VS 3V to 5.5V
Typical Bypass 0.1 µF
(Unless mounted close
to Processor)
G751
8
7
SMBDATA
SMBCLK
O.S.
1
2
8
7
6
+Vs
A0
A0
6
5
Address(Set as
desired)
A1
A2
3
To Processor
Interrupt Line
G751
3
4
O.S. Out
A1
A2
1
2
SMBDATA
SMBCLK
Interface
5
GND
4
O.S. Set for active low for
wire OR’d multiple
interrupt line
8Pin SOP/MSOP
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 2.4
Nov 26, 2002
1