nrf51822 power consumption

Question

Hi,
I do some test for nrf51822 power consumption.result as below:
my board
1.system off mode:270uA
2.system on sleep mode(no UART,no GPIOTE):300uA
3.system on sleep mode(UART, no GPIOTE):1.52mA
4.system on sleep mode(no UART, GPIOTE):1.42mA
5.system on sleep mode(UART, GPIOTE):1.54mA
PCA10004c demo board
1.system off mode:3uA
2.system on sleep mode(no UART,no GPIOTE):30uA
3.system on sleep mode(UART, no GPIOTE):1.16mA 
 either of UART or GPIOTE module is used ,the current is greater than 1 mA.
Is that right? According to the nrf51822 product specification v2.0,uart is 220uA,GPIOTE 22uA 
 Dan

Ole Morten · Accepted Answer

If you use the IN/OUT channels of GPIOTE, the 16 MHz clock will stay running, and this will cause >1 mA extra current consumption. Same goes for UART, once you start RX or TX the 16 MHz clock will stay running. 
 If you just need pin wake-up you should therefore make sure to instead use the PORT event and the SENSE field in NRF_GPIO->PIN_CNF[] registers. As for UART, you should use hardware flow control to enable it only when needed. 
 You can take a look at this question for reference, and the table in section 8.3 of the PS.

nrf51822 power consumption

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