Application circuit connecting external reference power supply
The figure shows the application circuit diagram for connecting an external reference power supply. This reference voltage appears on the VREF pin in the circuit due to the on-chip reference being high precision, low drift, and factory calibrated, and when the ADC is enabled. Therefore, the on-chip reference can be used as a 2.5V reference power supply for system expansion. To use the on-chip reference outside of the microswitch, it should be buffered on the VREF pin and a 0.1μF capacitor should be connected between this pin and AGND.
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