Part Number: TIC12400-Q1
Our customer would like to use MSDI in their system of powertrain. /INT signal is used for awakening up the MCU. The signal for awakening up the MCU is from several inputs such as an ignition switch or any other internal causes. They would like to distinguish where the signal comes from. However, the system has a MCU that needs few hundreds milliseconds to wake up. Some signals last for a few milliseconds. If the signal ends before the MCU READs INT_STAT_COMP bits, the MCU cannot distinguish what the interruption is.
The TIC12400 does not latch the status of the INX pins once the interrupt is generated. The IN_STAT_COMP register will always reflect the latest status of the pins at the end of the polling cycle.
If the MCU does not wake up before the status changes AND a new polling cycle runs, it could miss a switch status change. The TIC12400 has ways to prevent this, such as increasing the polling cycle time to be longer than the MCU wake up time to ensure that a new cycle cannot begin before the MCU wakes up.
In reply to Andrew_Mason:
If the tPOLL_TIME is much longer than the time for pushing switch, can TIC12400 miss the switch-state change in polling mode?
In reply to RYO:
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