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Powering nRF52810 with 3.6V Lithium battery

George555

I have designed some beacons based on nRF52810. The software uses the minimum functionality of the radio to transmit some packets every second and sleep.

In their sleep period the beacon consumes around 2-5uA.

I chose to power the beacons with an ER14250 3.6V Lithium battery, 1200mAh.

During an application testing I deployed around 10 beacons that transmitted a packet to a receiver every second. I noticed some of them drained the battery within days which is not reasonable as they should last over 2 years with that battery.

I tried to investigate the problem further. I programmed a beacon to transmit every 100ms.

A week after I found it dead. The battery was completely drained and also the chip was damaged.

I replaced the battery and it didn't work.

I used a bench power supply at 3.5V to check what was going on and I noticed its current consumption was around 150mA which is an indicator of a faulty chip.

The question is can that battery be used for nRF52810? In the datasheet it says absolute maximum at 3.6V yet in the recommended voltage range it mentions up to 3.6V.

So that's a little confusing as the absolute maximum voltage is the same as the recommended operating voltage.

Can that battery cause damage to the chip?

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    I also had a look at DEC4 in your schematic and in the internal schematic of the module. It looks as a the capacitance at DEC4 also deviates from the recommended values in the reference design. The reference design recommends 1.0uF, however, the module is listed with 100nF. If this is the case, nRF52810 is then provided with 1000nF + 100nF instead of 1000nF.

    It is hard to guess exactly what will happen if the capacitance at the DEC pins deviate from the reference design. However, this would be among the most important issues to improve in the design.

    You could try to modify one of the working beacons in order to provide the DEC pins with the correct capacitances, although this is difficult when the module already deviates from the recommendations. You could perhaps contact the module manufacturer in order to get their comments on the DEC pins.

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  • 0

    I also had a look at DEC4 in your schematic and in the internal schematic of the module. It looks as a the capacitance at DEC4 also deviates from the recommended values in the reference design. The reference design recommends 1.0uF, however, the module is listed with 100nF. If this is the case, nRF52810 is then provided with 1000nF + 100nF instead of 1000nF.

    It is hard to guess exactly what will happen if the capacitance at the DEC pins deviate from the reference design. However, this would be among the most important issues to improve in the design.

    You could try to modify one of the working beacons in order to provide the DEC pins with the correct capacitances, although this is difficult when the module already deviates from the recommendations. You could perhaps contact the module manufacturer in order to get their comments on the DEC pins.

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