Global Mixed-mode Technology Inc.
G751
Digital Temperature Sensor and Thermal Watchdog
with Two-Wire Interface
General Description
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
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 鈥淐omparator鈥?or 鈥淚nterrupt鈥?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鈥檚 T
OS
and T
HYST
registers. The sensor powers up in Com-
parator mode with default thresholds of 50掳C T
OS
45掳C T
HYST.
for G751-1 and 80掳C T
OS
, 75掳C T
HYST
for G751-2.
Key Specifications
Supply Voltage
Supply Current
operating
3.0V to 5.5V
280碌A (typ)
1mA (max)
2碌A(typ)
卤2掳C (max)
卤3掳C (max)
shutdown
Temperature Accuracy
-25掳C to 100掳C
-55掳C to 125掳C
Ordering Information
PART
T
OS
T
HYST
Transport Media
PACKAGE
8 SOP
8 SOP
G751-1 50掳C/45掳C 2500 Units on Tape and Reel
G751-2 80掳C /75掳C 2500 Units on Tape and Reel
Applications
System Thermal Management
Personal Computers
Office Electronics
Electronic Test Equipment
Pin Configuration
Typical Application
+V
S
3V to 5.5V
Typical Bypass 0.1 碌F
(Unless mounted close
to Processor)
G751
7
SMBDATA
SMBCLK
O.S.
GND
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
To Processor
O.S. Out Interrupt Line
3
8Pin SOP
4
O.S. Set for active low for
wire OR鈥檇 multiple
interrupt line
Ver: 2.2
Nov 07 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
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