Please let me know your advice about ADC4 output of ADuC7060.
Our customer uses EVAL-ADuC7060 at below condition.
Primary channel and Auxiliary channel is measured alternately.
Output data of Primary channel is OK ,
but the data of Auxiliary channel is periodically swing about 12274000LSB +- 1000LSB.
When auxiliary channel only is measured , ( primary channel is disabled)
above problem is not appeared and result is about 12274000 LSB +- 100LSB
Is there any limitation of using both primary channel and auxiliary channel ?
If you need measurement data , please let me know your e-mail address because it is cutomer's data.
Measured channel is below sequence.
ADC0:1 - > ADC4 - > ADC2-> ADC4 -> ADC3 -> ADC4 - > ADC0:1 ....
ADC0:1 = RTD
ADC2 and ADC3 : another sensor output voltage
ADC4: 0.88V from reference voltage generator
ADC5 is connected to AGND.
Board switch setting
Other switch: Open
Register settings of both channel measurement
ADCMDE = 0x81;
ADCMSKI = 0x03;
ADCFLT = 0xC0FF;
ADCCFG = 0x0000;
IEXCON = 0x42;
Register settings of auxiliary channel only measurement
Below change from above settings
ADCMSKI = 0x02;
ADC0CON = 0x0000
Please let me know your advice.