RE: nrf52832 1.8v, external and internal dc/dc

embedded717 — Fri, 16 Jun 2017 21:36:45 GMT

Is there 1.8V available in these boards ? I am using 52840, I see 5V and 3.0V. But I need 1.8V, I am hoping I wont have to use external LDO board for 1.8 V and 3.3V that I need for my sensor.

RE: nrf52832 1.8v, external and internal dc/dc

Stefan Birnir Sverrisson — Fri, 08 Apr 2016 12:48:37 GMT

Yes, you cant supply nRF5x with more than 3.6V, so you would need an external LDO or DCDC to lower the voltage of the Li-Po battery to an acceptable level. Perhaps a good external DCDC is mentioned here

A DCDC will waste less energy than LDO when lowering voltage from input to output. The drawback is that DCDC uses current in order operate, and is therefore not more efficient than LDO when load current is low. For the production version of the nRF52832, the internal DCDC is automatically turned off when using LDO is more efficient than using DCDC.

So, even if you use external DCDC to lower voltage to DCDC, you will have further power savings with enabling the internal DCDC as well.