Power consumption on custom nRF52832

RE: Power consumption on custom nRF52832

YSR1991 — Tue, 17 Oct 2017 09:38:13 GMT

@swapnil Please post your schematic. Also check waveforms of Crystal pin. In sleep mode only 32KHz crsyal should run , there should not be any signal on 32MHz crystal.

Regards, Sharad

RE: Power consumption on custom nRF52832

Krunal Desai — Mon, 13 Feb 2017 21:55:56 GMT

Do you have floating input pins that have no pull? Unsure if the I/O cell design of the nRF is tolerant of floating, but could be causing it. I've also seen some MEMS sensors draw upwards of 2-3mA each (100x their normal draw) with floating pins on them.

RE: Power consumption on custom nRF52832

Stian Røed Hafskjold — Mon, 13 Feb 2017 12:21:28 GMT

Do you have the gerber files and the BOM?

RE: Power consumption on custom nRF52832

Swapnil — Mon, 13 Feb 2017 10:33:57 GMT

@Stian

Sorry for very late reply, I am uploading my design you can have a look on it and suggest me what might be wrong with my design. I think some components might be causing more power consumption.

RE: Power consumption on custom nRF52832

Stian Røed Hafskjold — Thu, 09 Feb 2017 10:37:55 GMT

Hi Roger. Sorry, I don't quite understand what you mean. Just trying to give some tips on how to narrow down the problem.

RE: Power consumption on custom nRF52832

Roger Clark — Wed, 08 Feb 2017 21:04:17 GMT

@Stian

So are you reverse engineering an existing product?

RE: Power consumption on custom nRF52832

Stian Røed Hafskjold — Wed, 08 Feb 2017 15:53:39 GMT

Yes, it could be! It's hard to know without any schematics or code.

RE: Power consumption on custom nRF52832

Andrei — Wed, 08 Feb 2017 15:49:51 GMT

Maybe it's a problem with MPU9250???He can try without it....

RE: Power consumption on custom nRF52832

Stian Røed Hafskjold — Wed, 08 Feb 2017 15:36:11 GMT

It's not much on the nRF52 that can draw 18mA of current. As Andrei suggests, you should try to flash code on the chip with a known current consumption for reference.

You can just flash this code:

int main(void){
    NRF_POWER->SYSTEMOFF = 1;
    for(;;){}
}

The current consumed by the chip is now about 300nA

If you still get several milliamps it must be some external components on your PCB or something wrong with the design. Maybe you can upload the schematics of your design so we can have a look at it.

RE: Power consumption on custom nRF52832

Andrei — Wed, 08 Feb 2017 14:44:15 GMT

I say, you can upload example to your custom nRF board and measure it. If current is high, problem is in hardware...

RE: Power consumption on custom nRF52832

Swapnil — Wed, 08 Feb 2017 14:40:25 GMT

I dont want to measure current using development board. I want to individually measure it using multimeter, just by supplying voltage and connecting ammeter in series. Also I just want to know what componenets leads to maximum power consumption.

RE: Power consumption on custom nRF52832

Andrei — Wed, 08 Feb 2017 14:35:24 GMT

You can upload to nRF example from nrf52 sdk.... And measure current..

RE: Power consumption on custom nRF52832

Swapnil — Wed, 08 Feb 2017 14:31:17 GMT

Sorry but dont have any code for iBeacon. I am just accesing MPU and battery service with bluetooth.

RE: Power consumption on custom nRF52832

Andrei — Wed, 08 Feb 2017 13:54:15 GMT

Can you share your code of just num example app, like iBeacon...?

RE: Power consumption on custom nRF52832

Swapnil — Wed, 08 Feb 2017 13:52:41 GMT

MPU consumption is 3.7mA as per datasheet, but i am not enabling it. My board consumption just without MPU reading is 18mA.

RE: Power consumption on custom nRF52832

Andrei — Wed, 08 Feb 2017 13:47:34 GMT

MPU consumption is 6mA?

RE: Power consumption on custom nRF52832

Swapnil — Wed, 08 Feb 2017 13:41:58 GMT

I am not using any external DCDC or LDO. Just reference design with MPU9250 connected

RE: Power consumption on custom nRF52832

Andrei — Wed, 08 Feb 2017 13:40:45 GMT

So you don't use anything now in custom PCB? Only reference layout and rf antenna?No external dcdc or ldo?

RE: Power consumption on custom nRF52832

Swapnil — Wed, 08 Feb 2017 13:38:01 GMT

I used the components as mentioned and recommended in nRF52832 hardware design for building custom board. Like Oscillator with capacitors, coupling capacitor, inductors for antenna and DCDC configuration, LED with series resistor and pull up resistor for MPU. I am currently using default LDO regulator.

RE: Power consumption on custom nRF52832

Andrei — Wed, 08 Feb 2017 13:21:23 GMT

Hello!What components are you using in your custom PCB? The problem can be in dcdc, or in another components.....In my case I use dcdc that in standard mode with small current has low efficiency.Its current is around 10mA on low current load....