Sleep current tolerance in nRF51822

[Leo]

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Hello,

I'm checking the sleep current with nRF51822 DK board, and have two questions.

1. sleep current is 2.35uA. In the datasheet, there is only typical value as 2.6uA. How much current can be expected over 2.6uA? What is the tolerance of sleep current?

2. I'm using the default SDK. Are below conditions correct? a. Tx power = 0dBm b. code is running from flash memory. c. Radio current values noted in the datasheet doesn't include CPU consumption.

Thanks.

[Stefan Birnir Sverrisson]

Hi

1. I think there have not been made any tolerance test, so that is why the typical value is only demonstrated in the PS. I have measured current on number of samples (perhaps between 10 and 20) and it is rarely exactly 2.6uA, but I think none have been over 3.0uA, but perhaps I was just lucky. At least you have been lucky with your sample which is below the expected value.

a) The default radio TX power is 0dBm.

b) Yes, code is running from flash

c) When running code from flash, the current conumption is 4.4mA for the CPU, as specified in table 29 in the nF51822 PS v2.0. The radio will consume ~10.5mA when in TX mode with 0dB transmit power. If both CPU and radio are active, the current consumpiton is 10.5+4.4=14.9mA