Datasheet

MAX31725/MAX31726
±0.5°C Local Temperature Sensors
8Maxim Integrated
Detailed Description
The MAX31725/MAX31726 temperature sensors measure
temperature and convert the data into digital form. An
I
2
C-compatible two-wire serial interface allows access
to conversion results. The devices accept standard I
2
C
commands to read the data, set the overtemperature alarm
(OS) trip thresholds, and configure other characteristics.
While reading the temperature register, any changes in
temperature are ignored until the read is completed. The
temperature register is updated for the new temperature
measurement upon completion of the read operation.
OS Output, T
OS
and T
HYST
Limits
In comparator mode, the OS output behaves like a
thermostat (Figure 2). The output asserts when the
temperature rises above the limit set in the T
OS
register.
The output deasserts when the temperature falls below
the limit set in the T
HYST
register. In comparator mode,
the OS output can be used to turn on a cooling fan,
initiate an emergency shutdown signal, or reduce system
clock speed.
In interrupt mode, exceeding T
OS
also asserts OS. OS
remains asserted until a read operation is performed
on any of the registers. Once OS has asserted due to
Figure 2. OS Output Temperature Response Diagram
T
OS
T
HYST
INACTIVE
ACTIVE
INACTIVE
ACTIVE
READ
OPERATION
READ
OPERATION
READ
OPERATION
TEMPERATURE
OS OUTPUT
(COMPARATOR MODE)
OS SET ACTIVE LOW
OS OUTPUT
(INTERRUPT MODE)
OS SET ACTIVE LOW