nrf52840 RX with DCDC is high current comsumption

RE: nrf52840 RX with DCDC is high current comsumption

loquat — Wed, 05 Sep 2018 02:25:45 GMT

Thanks.

RE: nrf52840 RX with DCDC is high current comsumption

Stian Røed Hafskjold — Tue, 28 Aug 2018 07:55:34 GMT

With a resolution of 1mA you have 8mA RX (which can be 7.5mA), and idle current of < 1mA. This gives you an RX current of 6.5mA which is within spec.

RE: nrf52840 RX with DCDC is high current comsumption

loquat — Mon, 27 Aug 2018 15:15:05 GMT

I try to run that scan start and stop interval 10 seconds.

among scan start -> about 8mA
among scan stop -> about 0mA(may be <1mA)

So that, may be not comsume current by other componets.

RE: nrf52840 RX with DCDC is high current comsumption

Stian Røed Hafskjold — Wed, 22 Aug 2018 07:33:48 GMT

Seems like something is wrong with the raytac board then. Are you sure USB is not plugged in or that any other components on the board can consume current? I don't have the Raytac board here so unfortunately I can't test here. Did you remove the programming cable and power cycle the board after flashing?

RE: nrf52840 RX with DCDC is high current comsumption

loquat — Mon, 20 Aug 2018 14:24:53 GMT

connect POWER to J9(Jlink) VCC and GND.

(POWER(3V) -> J9 VCC GND -> J9 GND)

RE: nrf52840 RX with DCDC is high current comsumption

Stian Røed Hafskjold — Mon, 20 Aug 2018 12:27:35 GMT

Ok I see. I found the BT1 header in the Raytac module datasheet. How do you power the Raytac module?

RE: nrf52840 RX with DCDC is high current comsumption

loquat — Tue, 14 Aug 2018 15:02:57 GMT

I'm sorry.

Additional, I modified.

#define SCAN_WINDOW 0x0050 -> 0x00A0 (always scanning)

And,

insert sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE) after nrf_sdh_ble_enable()

---

What is 'BT1 header'?

RE: nrf52840 RX with DCDC is high current comsumption

Stian Røed Hafskjold — Tue, 14 Aug 2018 09:15:07 GMT

Do you modify the example to continuously transmit on the radio, or are you just running the example as it is? Are you powering the raytac module on BT1 header?

RE: nrf52840 RX with DCDC is high current comsumption

loquat — Mon, 13 Aug 2018 15:04:47 GMT

I measured current comsamption by 'examples/ble_central/ble_app_blinky_c' on SDK15.0.0
before run a program,
ldscript's memory address modified
NRF_LOG disable

Result

BLE nano2 (SoftDevice S132 V6.1.0)
w/DCDC 5mA
wo/DCDC 11mA

MDBT50Q-DB (SoftDevice S140 V6.1.0)
w/DCDC 8mA
wo/DCDC 10mA

BLE nano2 is as expected result.
But MDBT50Q-DB seem too current.

MDBT50Q-DB's Specific problem?
(Measurement method upload)

RE: nrf52840 RX with DCDC is high current comsumption

Stian Røed Hafskjold — Mon, 13 Aug 2018 13:02:30 GMT

8 and 11 mA seems a bit high. 1M RX only run current is the radio run current without DMA and HF clock current which is needed. Please see the current consumption scenarios instead. These numbers include all peripherals that is needed for the radio to run: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/_tmp/graviton/autodita/CURRENT/parameters.id_current_radio.html

I would expect the RX numbers to be closer to 6 and 10 mA for the DCDC/LDO respectively.

Can you post the code you are using to measure. And also describe your measurement setup in detail.