RobG 1,892 Posted December 11, 2012 Share Posted December 11, 2012 This is a little Booster Pack which can be used to calibrate MPS430's internal clock (it's main purpose,) or as a HF ACLK source. I have 2 designs in mind, one with 8 by 2 dividers and one with 10 by 2 and 2 by 5 dividers. With 16MHz crystal, the first one would give me up to 9 frequencies (I think I will make only 4 available): 16, 8, 4, 2, 1MHz, 500, 250, 125, 62.5kHz. The second one up to 33 frequencies: 16, 8, 4, 2, 1MHz, 500, 250, 125, 62.5, 31.25, 15.625kHz 3.2, 1.6MHz, 800, 400, 200, 100, 50, 25, 12.5, 6.25, 3.125kHz 640, 320, 160, 80, 40, 20, 10, 5, 2.5, 1.25kHz, 625Hz Oscillator will feed P1.0 or P2.6 (XIN) I think I will also make it available as a kit for $6-$8. ICs will be SOIC, other parts through hole. bluehash 1 Quote Link to post Share on other sites
CsCrazy 5 Posted December 12, 2012 Share Posted December 12, 2012 Would it be possible to overlap smd-pads at least on capacitors? It could basically be just a solder mask opening? I think many of us have smd-components which could then be used too Quote Link to post Share on other sites
ike 53 Posted December 12, 2012 Share Posted December 12, 2012 RobG there is internal prescaler in msp430. So if you have 16MHz you basically have 8/4/2MHz also, if you have 1MHz you have 500/250/125KHz also ... and so on. Quote Link to post Share on other sites
RobG 1,892 Posted December 12, 2012 Author Share Posted December 12, 2012 If you use this board as an oscillator (XIN,) prescaler can be used in addition to BP's divider. Quote Link to post Share on other sites
Rickta59 589 Posted December 12, 2012 Share Posted December 12, 2012 Oscillator will feed P1.0 or P2.6 (XIN) How about allowing the TIMERA0 TIMERA1 clock input pins to be driven? Those are actually the only legitimate HF external clock pins. -rick Quote Link to post Share on other sites
RobG 1,892 Posted December 13, 2012 Author Share Posted December 13, 2012 Yes, P1.1 & P1.2 will be included. BTW, P2.6 is the external HF clock input. Quote Link to post Share on other sites
traxman 23 Posted December 13, 2012 Share Posted December 13, 2012 Maybe You should use LTC1799 one-chip-oscilator (1kHz-33MHz three decades with resistor tunning) as additional free tunning oscilator? http://www.linear.com/product/LTC1799 I made this smal PCB for direct replacement fixed DIP8 oscilators: bluehash 1 Quote Link to post Share on other sites
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