NRF8001 dc/dc converter enabled schematic

[Hisham]

Hello,

I attached the schematic found in the manual for NRF8001, in the case of DC/DC converter enabled. It shows that an external 32.768KHZ crystal is used, while in the table(also attached) shows that in case the DC/Dc converter to be enabled the external crystal cannot be used.

Please clarify if i have to add the external crystal in case i want to use the DC/Dc converter.

Thanks

[Hisham]

Thanks ole,

In case i am trying to reduce the power consumption as much as possible, so what is recommended to use dc/dc converter enabled and use internal oscillator, or don't use dc/dc converter and use external crystal?

[TIE Fighter]

I think the best way to squeeze every bit of battery may be to use the DC-DC and the 32Khz on the design. Use the DC-DC with 32KHz internal RC until the battery voltage hits about 2.3v on the battery, after this the DC-DC is not efficient so then switch to a Setup that uses the 32MHz external crystal without the DC-DC. You should be able to use the ACI command Battery level measure the battery voltage. You will need to modify the Setup on the fly to switch from DC-DC, 32KHz RC to no DC-DC, 32KHz external crystal, or have 2 Setups that you can switch between. The DC-DC and 32Khz components can be mounted without any problem at the same time.