nrf51822 VDDPA voltage

[SUMIT RANJAN]

Hi, I am using NRF51822 BLE. I wanted to know that when we put this BLE ic in sleep mode then, is there VDD_PA voltage is still 1.6V or it becomes shut off internally.???

[Asbjørn]

VDD_PA will only be at 1.8 V when the radio on the chip is transmitting, by that I mean actually sending bits on the air. VDD_PA is DC supply for the internal power amplifier. So as long as you are not transmitting, VDD_PA will be at 0 V. The radio will switch off VDD_PA automatically.