Can the configuration registers of the ALED7709 be stored in the ALED7709?

[TIENHUA]

Hi Sir,

Can the configuration registers of the ALED7709 be stored in the ALED7709, or must they be controlled via I2C by the MCU every time?

There shows "This variant is the most generic one, it must be controlled through I2C since at POR almost all registers are clean." in the datasheet page 53.

Does it mean ALED7709 cannot store configuration?

[Peter BENSCH · Accepted solution]

Welcome @TIENHUA, to the community!

Correct, none of the ALED7709x variants contain NVM (Non Volatile Memory) in which anything could be permanently stored. The set register content is retained in STANDBY, but not in the event of a power failure.

The sentence you quoted refers to the behaviour of the variants after power-up:

• the ALED7709A variant waits until a configuration takes place
• the ALED7709B variant is at least active (with all restrictions) and can then be configured or only controlled

Does it answer your question?

Regards
/Peter