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BQ34Z100-G1: 10-LED expander details

Matteo Rigamonti
Expert 1170 points
Part Number: BQ34Z100-G1

Good morning,

I'm going to use the BQ34Z100-G1 in "10-LED Expander with I2C Host Comm" mode. In such a mode the BQ34Z100-G1 sends LEDs status through a bitbanged approach with RC2 as Clock and RC0 as Data.

Is it possible to have some more information about timing of those RC0 and RC2 signals?

Is that bit streaming triggered only by a short circuit between REG25 and VEN pins or there is any way for having a continuous automatic repetition of such a streaming?

Thank you and best regards

Matteo

  • 0
    TI__Mastermind 25955 points

    Hi Matteo,

    The device may be configured to be always on, or by requiring the press of a button (and then on for a set period of time determined by the parameter: LED Hold Time).

    To switch between always on/button press, please assert/deassert Bit 3, LED_ON, of the LED/COMM Configuration Register. More information may be found in section 7.3.13 of the Datasheet.

    More timing information may be found about the SNx4HC164 8-Bit Parallel-Out Serial Shift Registers here: www.ti.com/.../sn74hc164.pdf

    With respect to the triggering the LED to blink at a set rate, the switch may be replaced by a FET and an external MCU or circuit could be utilized to 'press and hold' the button for 1 second where the LEDs stay illuminated for Y seconds and the external MCU (or other circuit) repeats the 1 second 'press and hold' every X seconds, where X > Y.

    Sincerely,
    Bryan Kahler