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]

Hi Håkon, it is good to hearing from you again.

the reason for this question is: I've got few PCBs with DCDC configuration, but the solderbridge was defauls connected. Next PCBs are with int-LDO and low-energy configuration, so do not have this problem.

But still wanted to ask if there was any damage caused to the chip in the case of DCDC... now I know :) I shouldnt try it :))

Thank you also for explanation!

With best regards Oleh