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ADS7843: Regarding the replacement of ADS7843 with ADS7846E

Kyohei
Expert 1480 points
Part Number: ADS7843
Other Parts Discussed in Thread: ADS7846

Tool/software:

Hi team,

My customer has adopted the ADS7843 as a touch panel controller and is considering replacing it with the ADS7846E to address touch panel misalignment issues.

We would appreciate it if you could confirm the following points.

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We have adopted TI's ADS7843, but we have encountered touch panel misalignment issues. After various investigations, we found TI's application note stating that replacing it with the successor ADS7846E addresses the Y-axis misalignment.

We are considering this replacement, but will the software work without any changes?

The hardware is said to be pin-compatible, and looking at the functions, it appears that the ADS7846E adds the ability to measure voltage and temperature to the pins corresponding to IN3 and IN4 of the ADS7843. These two pins are currently connected for debugging purposes but are not used in the product. We are only using it as a touch panel controller.

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Best regards,

Kyohei

  • 0
    TI__Mastermind 27290 points

    Hi,

    The ADS7843 touch screen controller has undergone software revisions, let me review this device and update the thread later today

  • 0 in reply to Daveon Douglas
    Expert 1480 points

    Hi Daveon,

    Thank you for your response,

    Was there also a software change in the use of ADS7843?

    The datasheet states that when using ADS7846, additional features can be utilized through software changes from ADS7843.

    If switching to ADS7846 but using it only as a touch panel controller without utilizing the additional features, can it be used with the same software as ADS7843?

    Best regards,

    Kyohei

  • +1 in reply to Kyohei
    TI__Mastermind 27290 points

    Hi,

    There are a few differences in configuration bits between the devices. This is shown in the control byte bit description in Table 4 of the datasheet.

    Channel select bits (A2-A0) are different due to the addition of Z position, Aux, Temp, and VBAT. SER/DFR and PDx bits have differences as well.

    The flexibility in the device capabilities are different but the programming sequence and format is the same. I suggest reviewing customer configuration in ADS7843 and make sure it is achieving the same functionality in ADS7846