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BQ78350 and LCD control

martin gibbs
Intellectual 520 points
Other Parts Discussed in Thread: BQ78350, BQSTUDIO

Good Morning Ti Forum,

Can you confirm that the blink and flash control for the LED display also works for LCD mode as well.

I have successfully connected an LCD to the bq78350 and the bars increment and decrement with charge. However I cannot get the blink and flash period settings in LED Config in bqstudio to work. Changing the 488us units has no effect. The LCD refresh rate; I can change successfully.

Also I notice that I have to power cycle the bq78350 to get the settings to take effect. Is that correct?

Thanks.

Regards,

Martin

  • 0
    Intellectual 380 points

    >Also I notice that I have to power cycle the bq78350 to get the settings to take effect. Is that correct?

    From experience, some of the dataflash settings require a reset to take effect. You can use the Reset command instead of power cycling (button in bqstudio or write 0x0041 to command 0x00)

  • 0 in reply to Marek Roszko
    Intellectual 520 points


    Thanks Marek Roszko

     

    I am still waiting for a response from Ti on my first question on the blink and flash control when in LCD mode.

    I have firmware build bq78350_v0_06_build_16.srec and Version 1.3.24.201409161253 BQstudio.

    Thankyou.

    Regards,

    Martin

     

  • 0 in reply to martin gibbs
    TI__Guru 54715 points

    There should be some clarification in a future document update.  For now note in the TRM section 12.4 the description "When the display is enabled for LEDs, the following configuration options are available: " and that the names for the parameters are "LED Blink Period" and "LED Flash Period".  These should be left at the default for LCD operation.

  • 0 in reply to WM5295
    Intellectual 595 points
    Are the five LEDs internally current limited by BQ78350 or shall I use five external current limiting resistors? Besides, the values for these internal resistors are not reported anywhere and I don't know which voltages can apply safely to LEDs.
    Can someone help me, please?
  • 0 in reply to dtluigi
    TI__Expert 6470 points
    No resistors are required. The LED drivers will sink about 3 mA. Use caution not to apply a voltage to the LED pins higher than the Vcc to the IC.