the current variation of nRF52840

RE: the current variation of nRF52840

Jared — Fri, 13 Aug 2021 08:30:34 GMT

Hi,

I checked internally, and although that we don't have enough test data to be 100% certain, I would conclude that the current that you measure for SYSTEM ON is acceptable. We don't have enough data to define the variation range.

regards

Jared

RE: the current variation of nRF52840

yanning — Fri, 13 Aug 2021 07:42:08 GMT

Normal Mode

RE: the current variation of nRF52840

Jared — Fri, 13 Aug 2021 07:33:07 GMT

Hi,

For the regulator configuration, High voltage or Normal mode?

RE: the current variation of nRF52840

yanning — Thu, 12 Aug 2021 01:40:24 GMT

helle Jared

The following are details configuration:

Temperaue: 22℃; Voltage: 3V; Regulator: DC/DC; RAM: Power off section 3 and section 4 of RAM[8]; RTC: rtc_tick_disable in sleep mode using nrf_dtv_rtc_tick_disable(&rtc_inst); WDT: pause in sleep mode; Wakeup reason: push button(GPIOTE).

Thanks

RE: the current variation of nRF52840

Jared — Wed, 11 Aug 2021 12:17:02 GMT

Hi,

The current consumption in System On sleep depends on several factors such as temperature, system voltage, regulator configuration, RAM retention, and wakeup reason. You have specified the first two, but could you also specify the others?
Yes this is correct. The interval of the spikes is dependent on the current consumption. The higher consumption the higher the frequency of the spikes

regards

Jared

RE: the current variation of nRF52840

yanning — Tue, 10 Aug 2021 11:32:28 GMT

Hi Jared

Thanks for your quickly response.

1. The more configuration, the more current variation?

2. Please see the picture above, in SYSTEM OFF mode, there are some current spikes, means the regulator in refresh mode to maximum the efficiency. the time between two current spikes is different, the time interval of unit 1 is 300ms, but for unit 4, it is 100ms. why the time interval is different? Is the higher current consumption short the time interval? Or the time interval is vary with device to device casue the different current consumption?

RE: the current variation of nRF52840

Jared — Tue, 10 Aug 2021 08:14:05 GMT

Hi,

The current variation for the SYSTEM OFF sleep is acceptable. For SYSTEM ON, it depends on what other configuration you are using such as RAM retention, wake up on what event, comparator enabled etc.
Could you elaborate a bit more on this question. Not sure I understand what you're asking about?
This hasn't been specified.

regards

Jared