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BQ32000 clock source

Yogesh Palkar
Prodigy 50 points
Other Parts Discussed in Thread: BQ32000

Hi, I have used BQ32000 in a circuit. I have used a 32.768kHz crystal as suggested. Is there any need to connect capacitors to the crystal? Or will the crystal simply work alone?

Currently I have connected the crystal alone and the Oscillator flag bit is set to 1.

If needed, what value of crystal should I use?

  • 0
    TI__Guru 55605 points

    Yogesh,

    The specifications for the crystal on listed under the "recommended operating" conditions on page 4 of the datasheeet.  There is also a footnote at the bottom of the page that gives a reference crystal as the KDS DMX-26S.  Datasheet is attached.

    6320.DMX-26S datasheet.pdf

  • 0 in reply to Ryan Kehr
    Prodigy 50 points

    Hello Ryan Kehr sir,

    The crystal that is suggested is not available locally. So I have used a 32.768kHz crystal that is available locally. In general for these crystals we use a ceramic low value capacitor. As in for a microcontroller, we connect a 33pF capacitor. Now is capacitor connection necessary on this board as well. Because in one of the BQ32000 related forum, I read about a 12.5 pF capacitor that is connected. (http://e2e.ti.com/support/clocks/f/48/t/167712.aspx)

    Also could this be the sole reason for the OF = 1. During initialisation, I set it to 0 for the normal operation. But the read operation reads it as one.

    Also can a 1k pullup resistor be used instead of 4.7k?