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MSP430FR2310: TIA - unclear input channel selection

mabla pacraistu
Prodigy 20 points
Part Number: MSP430FR2310

Hi,

In the MSP430FR231x datasheet (revision E), in table 6-22 on page 60, the input channels of the transimpedance amplifier are described to only use P1.7 (TIA0+) as positive input, all other input channel selections are "not used". However, in figure 6-3 on the next page (and figure 6-4 on the one after), the TIA is shown to use GND as positive input for input channel 0b10. This seems rather contradictory, so what would happen if TRIPSEL would be set to 0b10?

In my application, I need both an SPI and a UART (IrDA-SIR) peripheral, so it would be nice to still be able to use P1.7 as UCA0TXD by having TIA0+ be connected to GND internally instead of having to give up the pin. I have not yet bought the part (so I can't test myself), as I've been looking for something suitable and this chip would fit perfectly if it'd be possible for TIA0+ to be connected internally to GND.

Thanks.

  • 0
    TI__Genius 11695 points

    Hi Mabla,

    Sorry for the content which is indeed misleading. But now I have no available equipment for verification. So I suggest you can bug one for test if urgent.

    Meanwhile, I will ask my colleagues who is familiar with this device that whether they have more comments for this, and I will give you the feedback next Monday.

    Best Regards

    Sal

  • +1
    TI__Genius 11695 points

    Hi Mabla,

    Here is the update for the feedback:

    Please refer to the diagram description in the datasheet, so it is available to use internal GND with TIA0+.

    Thanks for point out the issue and we will update the content in datasheet in the following version.

    Best Regards

    Sal 

  • 0 in reply to Sal Ye
    Prodigy 20 points

    Thanks for the clarification!

    And no worries about being slow, I'm only in the early design phase for a replacement of a product using obsolete parts.

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