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[CC6UL]: 3.3V input voltage for VSYS and VSYS2

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The CC6UL Hardware Reference Manual suggests two power schemes to power the module: one from a 5V power supply (4.5V - 5.5V) and one from a battery (3.7V - 4.5V).

The PF3000 documentation says that the PMIC's input voltage should be:
. Between 2.8V and 4.5V when VIN is used at input;
. Between 3.7V and 5.5V when VPWR is used at input.

Since the voltage ranges do not match the ones in the CC6UL documentation, is this a typo? If not, is it possible to power the CC6UL using 3.3V input at VSYS and VSYS2 (as it seems to be possible from the PF3000 documentation)?

Thanks you
asked Nov 1, 2017 in Linux by tnogueir New to the Community (10 points)

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1 Answer

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It's not a typo. It's true that the minimum input voltage documented in the PMIC datasheet is 2.8V, but this input voltage is not enough for powering the whole CC6UL SOM. The minimum input voltage allowed for ensuring the proper functionality of the module is 3.7V, as it was tested. That's the reason why we recommend the range 3.7-4.5V when VIN is used as the input.
When VPWR is used as the input (i.e. front LDO used) we establish the input voltage range 4.5-5.5V. In fact, you can power the module in this configuration with a voltage as low as 3.7V (as the PMIC datasheet say). However, in that case, it doesn't make a lot of sense to go with this front LDO configuration, since you can power directly VIN and the power performance will be more efficient without the external regulator.
answered Nov 6, 2017 by LeonidM Veteran of the Digi Community (3,727 points)
selected Jan 3, 2018 by tnogueir