Digital tamper detection

In a digital tamper interface, the event is triggered by the input change on the configured tamper input pin (IO_IN in the diagram). Immediately after the detection of a tamper event, the following actions take place:

• The tamper event and its timestamp are saved in NVRAM memory.
• If enabled, the tamper output (IO_OUT) is automatically set to its active level.
• If enabled, the power off timer starts counting and will power off the system when it expires (PWR ON signal).
• An IRQ is generated. This will wake the system from low-power modes such as suspend and power off.
• When the event is acknowledged by the host system, the output pin is de-asserted.

The following diagram shows the sequence of events:

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