LPC5411x battery backup and maximum operating frequency

[miloslav]

Is there any recommended schematic to backup RTC of the LPC5411x by coin cell?

I am a bit confused about maximum frequency too. Datasheet says maximum frequency is 150 MHz, however User manual says up to 100 MHz. Which number is valid.

[ZhangJennie]

Hi miloslav 

LPC5411x RTC and its oscillator continue running in all reduced power modes as long as power is supplied to the device.

RTC module runs from device power pins. There is no dedicate power supply pin to LPC5411x RTC module.

LPC5411x both cores  maximum frequency is 150 MHz.

Have a nice day,

Jun Zhang