AS1181 datasheet(20/92 Pages) AMSOSRAM

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AS1181

Functional description

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DS001139 • v3-00 • 2026-Apr-01

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7.1.1

Sleep mode

The Sleep mode can be entered by writing the SLEEP command to the

I2C_COMMAND_CODE register (in I²C mode) or by executing the CCC SLEEP (in I3C mode).

The Sleep mode can only be left by writing the WAKE command to the

I2C_COMMAND_CODE register (in I²C mode) or by executing the CCC WAKE (in I3C mode).

During Sleep mode the following register access is possible:

•

Writing to I2C_COMMAND_CODE register

•

Reading SYSTEM_STATE register

•

All other writes to any address don't take any effect

•

All other reads to any address return 0xFFFF

When the device uses I3C the following direct and indirect CCC operations are possible, with

the following exceptions:

•

ENEC/DISEC will only take effect after WAKE has been sent

•

CCC Strobe, ClearIRQ, and RunSelfTest don't trigger any CPU task

•

IBI generation and IRQ_N assertion is delayed by the oscillator start time

7.1.2

Config mode

Safety relevant registers can only be changed from I²C/I3C when the “config_mode” bit is set.

Within this mode, no new illumination cycle is allowed to happen.

Entering this mode is protected by a 32-bit key which is stored in CONFIG_KEY_COMP

the same key as CONFIG_KEY_COMP in order to toggle the config_mode bit. The

CONFIG_KEY registers get cleared to 0 on each try to toggle the config_mode bit.

This means that before entering and before exiting the config mode, the specific key needs to

be stored in the CONFIG_KEY registers.

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