L89HA S90 latest Protocol Specification

I need the latest firmware and Protocol Specification for L89HA S90. Having difficulty in entering into backup mode. Please kindly support.

Hi Dsreenivasan89,

You can enter/exit backup mode in 2 ways.
Method 1: Hold V_BCKP and turn on/off VCC to exit/enter backup mode. This is the most simplest way to control.

Method 2: Control backup mode by PAIR650 command and WAKEUP pin.

I will send related documents to you via message.

Best regards.