nRF51822: Connecting VCC and AVDD?

[Oleh]

Referring to the PCA10001 schematic, there is a solder bridge SB1, which connects AVDD with VCC_nRF.

Can you please explain in which cases is it needed?

Thank you Oleh

[Håkon Alseth]

Hi,

For LDO operation: There's an internal coupling between VDD and AVDD, so that solder bridge does need to be shorted. However, the internal switch will add a series-resistance, so shorting SB1 it will lead to a lower resistance.

For DCDC operation: Then there should not be a wired connection between AVDD and VDD, as AVDD will have another level than VDD.

Best regards Håkon

[Oleh]

Håkon, thank you for the explanation.

Following question: for the DCDC operation, connecting VDD and AVDD will damage the chip? or will the chip power up/start?

Thank you Oleh