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MSP430FE4252 consumes 2.5mA of current when ADC is run even when ESP430 module is disabled

Mahendra Karandikar49574
Prodigy 10 points

Other Parts Discussed in Thread: MSP430FE4252

I am trying to make battery powered indicator with 4 ccharacter 7 seg static LCD. 32 static segments are required. That makes MSP430FE4252 as obvious choice with sd16.

Even when ESP430 module is disabled, and only SD16 is run, the chip consumes about 2.5mA of current. I tried all combinations of ADC configurations. with this king of a current, using this for battery power is difficult.

How do I gurantee that ESP430 is really disabled?

Any suggestions?

  • 0
    Guru 227245 points

    First, see the device errata sheet of the 4252. It lists two errata related to suspend mode, SD16 and power consumption.

    Also, the device datasheet lists a power consumption of the SD16 for only one active channel of up to 1.5mA, depending on the operation conditions (gain, frequency etc.).

    You cannot expect high-speed high-gain A/D conversion without spending some power.

    To ensure that ESP430 is disabled, add some code to let it do something you can detect. If it is disabled, it shouldn't do anything. :)

    If you need low power consumption but conversion speed isn't a problem, you should go for a device with a normal ADC12. It consumes much less power than the SD16, but is slower and only 12 bit. You cannot have everything.

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