Global Mixed-mode Technology Inc.
G751
Digital Temperature Sensor and Thermal Watchdog
with Two-Wire Interface
Features
SMBus interface
Programmable Trip Point (T
OS
) and Hysteresis
(T
HYST
)
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
Shutdown mode to minimize power consump-
tion
Up to 8 G751s can be connected to a single
bus
General Description
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.
The host can program both the temperature alarm
threshold (T
OS
) and the temperature at which the
alarm condition goes away (T
HYST
). In addition, the
host can read back the contents of the G751’s T
OS
and T
HYST
registers. The sensor powers up in Com-
parator mode with default thresholds of 50°C T
OS
45°C T
HYST.
for G751-1 and 80°C T
OS
, 75°C T
HYST
for G751-2.
Key Specifications
Supply Voltage
Supply Current
operating
3.0V to 5.5V
280µA (typ)
1mA (max)
2µA(typ)
±2°C (max)
±3°C (max)
shutdown
Temperature Accuracy
-25°C to 100°C
-55°C to 125°C
Ordering Information
PART
G751-1P1
G751-2P1
G751-2P8
T
OS
T
HYST
50°C/45°C
TRANSPORT
MEDIA
PACKAGE
8 SOP
8 SOP
8 MSOP
Applications
System Thermal Management
Personal Computers
Office Electronics
Electronic Test Equipment
2500 Units on Tape
and Reel
2500 Units on Tape
80°C /75°C
and Reel
2500 Units on Tape
80°C /75°C
and Reel
P1: 8 SOP; P8: 8 MSOP
Pin Configuration
Typical Application
+V
S
3V to 5.5V
Typical Bypass 0.1 µF
(Unless mounted close
to Processor)
G751
SMBDATA
SMBCLK
O.S.
GND
7
1
2
3
4
8
7
6
5
+Vs
A0
A1
A2
Address(Set as
desired)
A0
A1
A2
1
SMBDATA
Interface
2
SMBCLK
6
5
8
G751
3
O.S. Out
To Processor
Interrupt Line
8Pin SOP/MSOP
4
O.S. Set for active low for
wire OR’d multiple
interrupt line
Ver: 2.4
Nov 26, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
