AM625: RTC usage and backup power supply

Shaofeng Luo

Part Number: AM625
Other Parts Discussed in Thread: BQ32000

Hi team

For AM625X, it seems that there is no dedicated VDD pin for RTC, how can we use RTC with a backup battery like CR2032? Or it's recommended to use an external RTC like BQ32000? Thanks!

over 3 years ago

+1 Kallikuppa Sreenivasa over 3 years ago

TI__Guru**** 220805 points

Hello Shaufeng Luo,

Thank you for the query.

it depends on the application. If the application requires the current time information to be available even after an SoC power cycle, Using a BQ32000 could be the lower current consuming solution.

There might be ways to implement (adds complexity) the time keeping function on the SoC using VDDS_OSC supply. This would need detailed system level analysis for implementation.

What is the use case you are looking at to implement the RTC with backup ?

Regards,

Sreenivasa

0 Shaofeng Luo over 3 years ago in reply to Kallikuppa Sreenivasa

TI__Intellectual 1680 points

Hi Sreenivasa

Thanks for your insight! It's used for CNC or PLC system, customer usually need to add a CR2032 battery to save the time info when the AC input is off. Just like our PC motherboard. It seems that adding a BQ32000 makes the thing simple. Right?

+1 Kallikuppa Sreenivasa over 3 years ago in reply to Shaofeng Luo

TI__Guru**** 220805 points

Hello Shaufeng Luo,

Thank you for the reply. Your understanding is correct.

Regards,

Sreenivasa

0 Shaofeng Luo over 3 years ago in reply to Kallikuppa Sreenivasa

TI__Intellectual 1680 points

Thanks Sreenivasa!

0 Kallikuppa Sreenivasa over 3 years ago in reply to Shaofeng Luo

TI__Guru**** 220805 points

Hello Shaufeng Luo,

Noted and have a great day.

Regards,

Sreenivasa

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AM625: RTC usage and backup power supply