Using nRF51822 with a 3V coin cell

RE: Using nRF51822 with a 3V coin cell

Mahesh Venkitachalam — Tue, 08 Aug 2017 11:02:42 GMT

Because the step-down is a switched (buck) converter which has less power loss than the default LDO...

RE: Using nRF51822 with a 3V coin cell

Jose Xavier — Tue, 08 Aug 2017 10:58:33 GMT

Why ise the stepdown converter reduce the battery drain?

RE: Using nRF51822 with a 3V coin cell

FormerMember — Fri, 24 Jun 2016 13:49:22 GMT

What peripheral/sensors are you planning to use?

RE: Using nRF51822 with a 3V coin cell

Mahesh Venkitachalam — Thu, 11 Jun 2015 09:58:07 GMT

Thank you.

RE: Using nRF51822 with a 3V coin cell

Øyvind Karlsen — Thu, 11 Jun 2015 09:30:36 GMT

Hi,

As Nenik said you can use the nRF51 down to 1.8V. Depending on your peripherals you could be fine using a 3V battery, I would recommend checking the datasheets. Maybe you could also look towards other battery types that provide 3v3 from the get-go?

If you do use a boost converter, make sure to not supply the nRF51 indiscriminately from this boost converter, as the added switching noise might deteriorate the performance of the chip, particularly the radio.

As for an explanation on general boost converter circuitry I recommend this tutorial on youtube. Even though his tutorial is based on a 50W boost converter, you can see that there are a lot of essential components being used. For a simpler boost converter you would still add some size and bill of material cost to your project.

Best regards,

Øyvind

RE: Using nRF51822 with a 3V coin cell

JohnBrown — Thu, 11 Jun 2015 07:43:10 GMT

Without knowing how much current your peripheral/sensors draw, or how long they are active for, it's a difficult question to answer. I would suggest that you look into the characteristics of coin cells, as they are not really design for high current applications AND long life, as far as I know.

RE: Using nRF51822 with a 3V coin cell

Mahesh Venkitachalam — Thu, 11 Jun 2015 06:22:01 GMT

Thanks. But if you have peripherals/sensors that use 3.3V, I am guessing that you will need one.

RE: Using nRF51822 with a 3V coin cell

Nenik — Thu, 11 Jun 2015 06:20:29 GMT

You don't need boost converter for 3V power source. nRF51822 runs from 1.8V. From a 3V coin cell, you can even use the built-in buck (stepdown) converter to reduce the battery drain while the battery is fresh.