In ADUC816 datasheet, there is very simple description about the function of bit ADC0IC and ADC1IC. Could it be possible to get more detailed explanation about its function?
The ICON sfr controls the current sources available on the ADuC8xx parts with sigma delta converters such as the ADuC816. These current sources are intended to be used with resistive transducers for instance by passing the current through the transducer and measuring the resulting voltage with the ADC. Alternatively the current can be passed through the transducer in series with a reference resistor and by measuring both the voltage across the reference resistor and across the transducer the signal value can be determined by the ratio of the two measurements. In this second case the actual value of the current is not especially critical since it is the ratio of the two values that is important and not the absolute value. In the more simple case though the value of the current is critical since the voltage is proportional to the current. For this purpose the parts are trimmed in the factory with a calibration value which will trim the currents to the expected value of 200uA. This trimmed value is enabled by setting the AD0IC and AD1IC bits for the two currents respectively.
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