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TMCS1101: TMCS1101A4U supply voltage 3,3 V recommended?

Florian Luetkebohle
Prodigy 330 points
Part Number: TMCS1101

Hi Colleagues,

do you recommend to use the TMCS1101A4U with a supply voltage of 3,3V?

The datasheet is confusing:

Best regards,

Florian

  • 0 in reply to Florian Luetkebohle
    TI__Prodigy 10 points

    Florian,

    Yes, others have raised this issue as well. It was an oversight in the Preview Datasheet, and will be corrected for the full release datasheet.

    We do not suggest to use the TMCS1101A4U with a 3.3V supply, as the device performance will not be specified under this condition. The two suggested alternatives are:

    • Use the TMCS1101A3U with a 3.3V supply. This does slightly reduce the use of full dynamic range of the ADC for small current measurements, but parametric performance is actually very similar between the A3U and A4U.
    • Because the device is fixed sensitivity (see http://www.ti.com/lit/an/sboa340/sboa340.pdf), a customer can use a 5V supply on the TMCS1101A4U and still feed the output to a 3.3V supply.  
      • The zero current output voltage will be 0.5V, but sensitivity will stay at 400mV/A. 
      • The customer will need to protect the ADC input in case of an over-current event to keep from going above allowed conditions. This can be relatively simply done by a RC filter and a protection diode.