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TPS65185 automatically calibrates VCOM

Meng jeffrey
Expert 2760 points
Other Parts Discussed in Thread: TPS65185

I saw in the manual that the TPS65185 can automatically calibrate VCOM, but my experiment board found that the VCOM voltage output by the IC is not automatically adjusted according to my screen. I use the TPS65185. Do I have to use the TPS651851?

  • 0
    TI__Genius 10885 points

    Hi Meng,

    The device requires a few steps to perform the VCOM measurement, described in section 8.3.7.1 of the datasheet:

    Pull the WAKEUP pin and the PWRUP pin high to enable all output rails.
    • Set the HiZ bit in the VCOM2 register. This puts the VCOM pin in a high-impedance state.
    • Drive the panel with the Null waveform. Refer to E-Ink specification for detail.
    • Set the ACQ bit in the VCOM2 register to 1. This starts the measurement routine.
    • When the measurement is complete, the ACQC (Acquisition Complete) bit in the INT1 register is set and the
    nINT pin is pulled low.
    • The measurement result is stored in the VCOM[8:0] bits of the VCOM1 and VCOM2 register.
    The measurement result is not automatically programmed into nonvolatile memory.

    Afterwards the PROG bit needs to be asserted in the VCOM2 register to store the value in the nonvolatile memory.

    Best Regards,

    Rick S.