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, I have some extra components, but I add these to the development board too. I removed the 32kHz crystal from my own PCB but also from the development board. I've only tested with an softdevice application (starting with ble_app_hrs_s110_with_dfu_pca10028 but add my own functionality to it). The softdevice init in the function BLE_Stack_Init is now like SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_TEMP_4000MS_CALIBRATION, NULL);

At my own PCB I cannot establish a Bluetooth connection because I need to tune my antenna but the software is running on it. I have a serial port on it at which I can print some chars.