Current Measurement verification using Power Profiler Kit 2

[Ridhi]

Case 1: Using nrf52832, solder bridge cut: what current values do the PPK gives : is it of the entire dev kit with all peripherals, programmer and BLE Soc or does it measure current of BLE SoC alone.

Case 2: while using external supply and ameter in series does the current accounts for entire dev kit or only the SoC

Case 3: how to measure current of SoC and sensors interfaced alone 

[helsing]

Hi Ridhima,

Case 3: how to measure current of SoC and sensors interfaced alone 

What are you trying to measure?

a) Would you like to measure the SoC + the sensors?

b) Or would you like to measure only the sensors?

c) Or are you trying to measure the SoC but not the sensors?

Would you be able to create a diagram or a table showing the connections? It is easy to make a mistake when decoding the connections from the image.

[Ridhi]

a) Would you like to measure the SoC + the sensors +leds which blink on dev kit when any event occurs

yes

b) Or would you like to measure only the sensors?

yes

Winbond W25Q16JV Serial Flash Memory:

sck pin 28

miso pi  29

mosi pin 30

cs pin 31

vdd pin wp

gnd pin gnd

STTS751:

adress pin vdd

vdd

gnd

sda pin 24

scl pin 23

power the dev kit with coin cell

PPK kit powered by usb and 

cut SB9 on nrf52832 measuring from P22 

how will i get to know the total current consumed by dev kit+ sensors+ advertising leds?

how will i get to know the total current consumed  by each sensor?

[Stian Røed Hafskjold]

Hi,

There are two main power domains on the nRF52 DK:

1. VDD
2. VDD_nRF

The current that goes through the P22 header is the VDD_nRF power domain, meaning that you will only measure the current that goes to the nRF52.

The VDD domain on the DK powers the JLink debugger chip, LEDs, buttons etc. Everything on the DK except the nRF52. VDD can be powered from P21, or USB, or using a coin cell.

If the sensors you are connecting are powered from one of the pins on the DK labeled VDD, the sensors will be powered from the VDD domain. Hence, you will not measure the current for those sensors through the P22 header. In this case you have two options:

1. Measure the current to nRF52 only through P22
2. Measure the current for everything. nRF52, sensors, DK, debugger, etc, by powering and measuring the current that goes into P21.

Alternatively, you can power the sensors from the VDD_nRF domain. Then you will measure the current going to both the sensors and the nRF52 on P22, but not the rest of the DK. If you want to do this you can power the sensor on the VDD_nRF pin on the P20 header.