mclr_ reset not functioning
jmw
Posts: 2
I put a sx28/dp onto a breadboard. When I went to program the sx28 it states "Chip connection failed". I tracked the issue to the MCLR_ not being tied to a high value. I had a 10K resistor tied to VDD (+5V). If I directly tied this to VDD with no pull-up resistor it works. I need to put a tactial switch to reset the circuit and am not sure what is going on. Any thoughts?
Comments
So if you measure the MCLR pin with the 10K to Vdd it is low ?
Sounds like a bad SX chip. I always use a 10K and never had any problems.
You could try a lower resistor value (don't go below 1K), but it shouldn't need to be lower than 10K.
Bean.
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I tried two SX's that were know good. I lowered the resistor to 1K then lower... at 100 ohms I was able to program the sx. After it programmed it never came active because the voltage on the MCLR_ was 2.8volts. (Vdd is 5.0 in the system) I scrapped the breadboard with the sx on it and went to the protoboard with the sx solderer and a clean reset button. The design is working fine now. What I think is happening is a large capacitance is rearing its head. I am off to investigate that and look for a solution for next time. any suggestions to limit the cap. on the breadboard.
Thanks for the comments...
jmw