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ACHIEVING HIGH ACCURACY AND 13-BIT RESOLUTION WITH ST7LITE2 ADC

Figure 7 Software Flow

Please refer to Table 5 This represents ADC data with and without filtering in addition to data

before and after offset compensation. It shows that the ADC is highly accurate provided care

is taken to reduce application noise, as the resolution of ADC is 13-bit.

Save “Avg” as an offset

in EEPROM

yes

Take “N” (=25) ADC

.

Initialize variables

Initialize ADC in “Offset

calibration” mode

samples & find out “Avg.”

Select AIN0 with Amplifier

ON

CNT > 100?

Take “N” (=25) ADC

ADC CNT = Avg - Offset

Store Avg. as ADC out-

put in EEPROM

no

(Offset compensation)

END

START

CNT = 0

CNT = CNT + 1