Current consumption difference nRF51422 and nRF51822

[Bart de Kramer]

I'm had develloped some software and tested it on the nRF51-DK. After that I made my own PCB design where only the nRF51422 is replaced by a nRF51822. When I flash both with exactly the same software, the nRF51-DK consumes about 5.6uA and my own PCB about 2350uA. Is there a difference between the nRF51422 and nRF51822 which can cause this big difference?

I'm using softdevice s110_nrf51_8.0.0.

[Bart de Kramer]

Hi Hung, First of all, happy newyear! Tomorrow I started again with the problem above. As you suggested I changed the values for L1 and C5 as showed in the nRF51822 PS (L1 = 10nF, C5 = 2.2pF) and removed the SWDCLK pulldown. But I still have that high current consumption.

The tests you suggested gives the following result: Erase SoftDevice:

1. 4.26 mA current consumption
2. 9.4 uA current consumption

Flash softdevice:

1. 2.07 mA during idle and a peak of 2.65 mA every 500msec (I assume this is because of the advertising). But if I scan for bluetooth devices with my phone I also cannot find the unit.