TI E2E Community
Clocks & Timers
Clocks & Timers Forum
BQ32000 clock source
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?
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.
Motor Drive Application Manager
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?
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.