Digital Signal ControllersのトピックRe: ADC16 problem of MC56F84789

ADC16 problem of MC56F84789

jero17 — Wed, 14 Dec 2016 07:13:10 GMT

1. GPIOA11/ANC19 is the only input pin of ADC16

2.Input trans-conduct Amp shares the same VDDA of the DSC, 3.3Vdc

3. conversion time 4uS, Sample time 20=long

4.Init code:

setReg32(ADC16_SC1A, 0x1FUL);
setReg32(ADC16_SC2, 0x44UL);
setReg32(ADC16_SC3, 0x0eUL);
setReg32(ADC16_CFG1, 0x5cUL);
setReg32(ADC16_CFG2, 0x04UL);

5. Synchronous Triggered, DMA read

Problem:

1.After 2-10 days normal running, ADC16 result becomes noisy and unpredictable. And some fixed value like 0x07f7 or 0x1ff7 may come out frequently.(input amp and signal source are checked OK)

2. Meanwhile, other analog parts of the DSC such as ADC12 and DAC12 or Comparators work well.

3. Till now, there are at least 5 DSCs suffered from the same problem one by one.

Help please!

Re: ADC16 problem of MC56F84789

jero17 — Mon, 19 Dec 2016 01:45:50 GMT

the 6th, last friday

Re: ADC16 problem of MC56F84789

ruvimelaver — Sun, 17 Dec 2017 07:59:58 GMT

Hello ,

Please advise date code of the part .

Thanks

Ruvi

Re: ADC16 problem of MC56F84789

jero17 — Wed, 04 Apr 2018 14:01:10 GMT

Hi,

I am looking forward to your suggestion.

Thanks

Wang Jun

Re: ADC16 problem of MC56F84789

mohammad_kamil — Thu, 05 Apr 2018 04:27:27 GMT

DTE: 1435 indicates it year 2014, 35th Week of manufacturing