STDS75 Datasheet, PDF (13/37 Pages) STMicroelectronics – Digital temperature sensor and thermal watchdog

STDS75
Operation
2.4
Interrupt mode
In Interrupt mode, the OS/INT output first becomes active when the measured temperature
exceeds the T_OS value a consecutive number of times equal to the FT value in the
Configuration register. Once activated, the OS/INT can only be cleared by either putting the
STDS75 into shutdown mode or by reading from any register (temperature, configuration,
T_OS, or T_HYS) on the device. Once the OS/INT has been deactivated, it will only be
reactivated when the measured temperature falls below the T_HYS value a consecutive
number of times equal to the FT value. Figure 5 illustrates typical OS output temperature
response for STDS75 configured to have a fault tolerance of 2. The interrupt/clear process
is cyclical between T_OS and T_HYS.
Figure 5. OS output temperature response diagram
TOS
Temperature
THYS
Inactive
OS Output - Comparator mode
Active
Inactive
OS Output - Interrupt mode
(1)
(1)
(1)
Active
Note:
Conversions
1. This assumes that a READ has occurred.
The STDS75 is configured to have a fault tolerance of 2 in this example.
AI12224b
13/37