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G751-1P1 Datasheet(PDF) 4 Page - Global Mixed-mode Technology Inc

Part No. G751-1P1
Description  Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
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Maker  GMT [Global Mixed-mode Technology Inc]
Homepage  http://www.gmt.com.tw

G751-1P1 Datasheet(HTML) 4 Page - Global Mixed-mode Technology Inc

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Ver: 2.4
Nov 26, 2002
TEL: 886-3-5788833
Global Mixed-mode Technology Inc.
Temperature-to-Digital Transfer Function (Non-linear scale for clarity)
Functional Description
The G751 temperature sensor incorporates a
band-gap type temperature sensor and 9-bit ADC
(Delta-Sigma Analog- to-Digital Converter). The
temperature data output of the G751 is available at
all times via the SMBus. If a conversion is in pro-
gress, it will be stopped and restarted after the read.
A digital comparator is also incorporated that com-
pares a series of readings, the number of which is
user-selectable, to user-programmable setpoint and
hysteresis values. The comparator trips the O.S.
output line, which is programmable for mode and
O.S. Output, TOS and THYST Limits
In Comparator mode the O.S. Output behaves like a
thermostat. The output becomes active when tem-
perature exceeds the TOS limit, and leaves the active
state when the temperature drops below the THYST
limit. In this mode the O.S. output can be used to
turn a cooling fan on, initiate an emergency system
shutdown, or reduce system clock speed. Shutdown
mode does not reset O.S. state in a comparator
In interrupt mode exceeding TOS also makes O.S.
active but O.S. will remain active indefinitely until
reset by reading any register via the SMBus inter-
face. Once O.S. has been activated by crossing TOS,
then reset, it can activated again only by Tempera-
ture going below THYST. Again, it will remain active
indefinitely until being reset by a read. Placing the
G751 in shutdown mode also resets the O.S. output.
Default Modes
G751 always powers up in a known state. G751
power up default conditions are:
1. Comparator mode
2. TOS set to 50°C for G751-1, to 80°C for G751-2
3. THYST set to 45°C for G751-1, to 75°C for G751-2
4. O.S. active low
5. Pointer set to “00”; Temperature Register
With these operating conditions G751 can act as a
stand-alone thermostat with the above temperature
settings. Connection to an SMBus is not required.
SMBus Interface
The G751 operates as a slave on the SMBus, so the
SMBCLK line is an input (no clock is generated by
the G751) and the SMBDATA line is a bi-directional
serial data path. According to SMBus specifications,
the G751 has a 7-bit slave address. The four most
significant bits of the slave address are hard wired
inside the G751 and are “1001”. The three least sig-
nificant bits of the address are assigned to pins
A2-A0, and are set by connecting these pins to
ground for a low, (0); or to +Vs for a high, (1).
Therefore, the complete slave address is:

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