topic Re: Current consumption in Wireless MCU

Current consumption

motog — Thu, 14 Oct 2021 11:51:55 GMT

Hello,

I have designed my custom board using pn7362 nfc ic. The current consumed by circuit in standby mode is at wakeup it is approx 1.1mA and in sleep mode it is 700mA. I have aded other components such as RTC, eeprom, motor ic etc as I'm using door access file for my application.

But the current consumed by the eval board(black board) is 600mA and 300mA, with the same code. I have another test board but without other ic it consumes 500mA and 250mA with the same code.

Can you suggest any changes in the mcu setting so that I can bring the current further down to match my eval board?? As I'll be using battery which will eventually drain I want to save power as much possible.

Thanks.

Re: Current consumption

fangfang — Mon, 18 Oct 2021 02:49:30 GMT

Hello,

It is recommended that you first measure the power consumption of MCU, RTC, pn7362, EEPROM and motor IC in run normally and sleep mode. Please let me know if has the information.

Have a nice day.

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Re: Current consumption

motog — Mon, 18 Oct 2021 05:43:06 GMT

Current consumption are as follows :

PN7362 - suspend mode -250uA

RTC - operating current - 700uA max; Standby current 5 uA

EEPROM - standby current 20uA

Motor IC - standby 45uA

I'm using controller in standby mode only.

If you require any other information please let me know.

Re: Current consumption

fangfang — Tue, 19 Oct 2021 03:49:23 GMT

Hello,

Thanks for your update information.

PN7362 and the components your provided have the normal current consumption. Please check your other components which has the higher current consumption.

Re: Current consumption

motog — Tue, 19 Oct 2021 05:05:41 GMT

The other remaining components are just antenna matching resistors and capacitors and diodes, which I dont think will be consuming high current.

Re: Current consumption

motog — Thu, 21 Oct 2021 07:31:43 GMT

Hi @fangfang,

Did you find any reason which could explain high current consumption on my board??

Hope you can provide with some solutions!

Re: Current consumption

motog — Sat, 30 Oct 2021 07:49:38 GMT

Hi @fangfang

It has been more than two weeks since I last got reply from you. As you can see I have provided you with all the details, I was hoping you could answer my query in some possible way.

Thanks!

Re: Current consumption

fangfang — Mon, 01 Nov 2021 01:45:51 GMT

Hello,

PN7362 has the normal current consumption. You may refer to the current consumption of MCU. Hope it help you.

Re: Current consumption

motog — Mon, 01 Nov 2021 12:52:23 GMT

Thanks for your help @fangfang .

I might have to look into other things which might be consuming current.

If you have any other suggestions please free to share.

Thanks

Re: Current consumption

fangfang — Tue, 02 Nov 2021 02:49:07 GMT

Hello

You are welcome. Please don't hesitate to contact us if any question.