High Power consumed by nRF52832

[alpeshpatel283]

Hello,

We have constructed a custom board of nRF52832 via I2C communication with sensor and INT based wake up. Following configuration enable

• DCDC Power Enable
• Disconnected TWI line in sleep mode
• Counter based RTC

 I measured the current consumption of custom board using real-time current measurement the multimeter and it is showing as 3.75mA with 3.3V of the power supply.

This consumes high current than expected and not able to suspect what is causing this much of current consumption.

Do you have any idea what could be causing this, and how to fix it?

Looking forward to hearing from you.

Thanks.

Regards,

Alpesh Mandani

[John]

That current is just about exactly the run current of the CPU while running from flash with the DCDC enabled. Best guess based on what you've told us is that you are not going to idle/sleep, or if you are something is waking you up very quickly after you enter idle/sleep. One thing I would check is to ensure all of your wakeup source interrupt flags are cleared before attempting to idle/sleep.

[alpeshpatel283]

Hi John,

Thanks for your support. Will check your suggestions and get back to you on further.

Yes, we are not able to put device in sleep/ idle mode.

We have used 100ms advertising interval . Could a small interval effect to core enter in to sleep or idel mode?

Let me know your thoughts on this.

Regards,

Alpesh

[John]

Hi Alpesh,

While 100ms is a relatively fast advertising interval, it is still a *lot* of time to sleep. The core should still be able to get to idle/sleep mode in that time quite easily. 

Regards,

John

[alpeshpatel283]

Hi John,

Thanks for your support.

We are planing to measure actual current consumption of nRF52832  using example of code to fixe our issue.

Can you please provide example code/Firmware that has to enable radio with fix duration of advertising and scanning mode, SOC enters in sleep/idle mode, SOC enter in normal mode to measure current consumption of custom design system?

Thanks.

Regards,

Alpesh

[John]

Hi Alpesh,

I can't share my code as it is the property of my employer. That said, you should be able to look at any of the ble_peripheral examples to see advertising setup and idle behaviors using the power_manage function call.