There used to be a chip that took a color burst crystal and created 1pps. I'm sure now that a 32768 KHz resonator can be divided to get 1 pps. You have to further divide it to get your required rate.
There used to be a chip that took a color burst crystal and created 1pps. I'm sure now that a 32768 KHz resonator can be divided to get 1 pps. You have to further divide it to get your required rate.
This may be useful to you too: http://www.hackersbench.com/Projects/1Hz/ A 1 Hz generator. If you need 0.1 of an hour or every 6 minutes, you would have to divide even further aand at an odd value. If you can find a resonator that can be divided by powers of two, all the better for your design.
I've spent the evening looking for an app note for the 4060 that included information on which crystal, resistor, and capacitor combinations provide what frequency. I didn't have any luck, it's not included in the standard datasheet. Anyone have any thoughts?
0.1 hrs is every 6 minutes. So, 1 Hz divided by 60 gives you every minute. Divide by another 6, gives you every 6 minutes.
A divide by 60 is a divide by 2 in series with a divide by 5 in series with a divide by 6. Since, I think, the link a few posts back as a 0.5 Hz out, the div by 2 isn't needed.
I've spent the evening looking for an app note for the 4060 that included information on which crystal, resistor, and capacitor combinations provide what frequency. I didn't have any luck, it's not included in the standard datasheet. Anyone have any thoughts?
I saw that one too. No help. All they say about the crystal-based circuit is "In Fig.5, R2 is the power limiting resistor. For starting and maintaining oscillation a minimum transconductance is necessary."
I saw that one too. No help. All they say about the crystal-based circuit is "In Fig.5, R2 is the power limiting resistor. For starting and maintaining oscillation a minimum transconductance is necessary."
Read it closely, real close. It took me almost 10 minutes to understand what it was talking about and why it didn't make sense in reference to the figure next to it. Notice there is no mention of the crystal in the highlighted passage. That passage applies only to the RC network in figure 5.1, not the XRC network in figure 5.2.
Read it closely, real close. It took me almost 10 minutes to understand what it was talking about and why it didn't make sense in reference to the figure next to it. Notice there is no mention of the crystal in the highlighted passage. That passage applies only to the RC network in figure 5.1, not the XRC network in figure 5.2.