Battery specifications
Battery specifications
(OP)
Hi,
I have a small circuit that needs to be powered at 3.6V and draws a continuous 35mA current.. The problem is that in the circuit is also a CC2420 transceiver with a max. absolute rating of 3.6V.
I was thinking of combining 3 x 1.2V NiMH cells I already have to make the 3.6V battery but I am worried that the voltage of the fully charged cell connected to the circuit (potentially around 4V, as 1.2V is the 'nominal' voltage for a NiMH cell) might fry the transceiver. I'm I justified in thinking this ?
I understand that the battery voltage will drop when its connected to the load but its the first few seconds of operation that worry me.
I have a small circuit that needs to be powered at 3.6V and draws a continuous 35mA current.. The problem is that in the circuit is also a CC2420 transceiver with a max. absolute rating of 3.6V.
I was thinking of combining 3 x 1.2V NiMH cells I already have to make the 3.6V battery but I am worried that the voltage of the fully charged cell connected to the circuit (potentially around 4V, as 1.2V is the 'nominal' voltage for a NiMH cell) might fry the transceiver. I'm I justified in thinking this ?
I understand that the battery voltage will drop when its connected to the load but its the first few seconds of operation that worry me.
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RE: Battery specifications
And yes, you'll need to regulate or crowbar the supply voltages to be less than 3.6V.
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RE: Battery specifications
The circuit (not mine unfortunately) uses the internal voltage regulator , so CC2420 is powered by VREG_IN.If you look at page 8 of the datasheet it quotes the maximum ratings for this setup. The 3.6V supply is dictated by other parameters irrelevant to CC2420 so there is no alternative.
Any quick ideas on how to regulate it at this voltage ? (Fixed linear regulator maybe ?)
RE: Battery specifications
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