Posted on November 28, 2005 at 12:55Hello
I used microcontroller ST72F521 in two devices with two different PCB and Routine. Both devices (were manufactured several devices of these kinds) have a very big ADC error. ADC has 16 inputs, three of them don’t work correctly: PD6(AIN6), PD7(AIN7), PF0(AIN8). These inputs have current sources, undefined in the ADC data sheets. For example: I connected the resistor 1k to ADC input and ground in series. In this circuit I got the estimated measure of 0.1 V on ADC input instead of 0 V. I set the Data Direction Register and Option Register of these pins to zero(0), so it isn’t a problem with the program.
Pl's try to support .
Thx
Amir
