Datasheet

dsPIC30F2011/2012/3012/3013

16.13 Configuring Analog Port Pins

The use of the ADPCFG and TRIS registers control the

operation of the A/D port pins. The port pins that are

desired as analog inputs must have their

corresponding TRIS bit set (input). If the TRIS bit is

cleared (output), the digital output level (V

OH or VOL)

will be converted.

The A/D operation is independent of the state of the

CH0SA<3:0>/CH0SB<3:0> bits and the TRIS bits.

When reading the PORT register, all pins configured as

analog input channels will read as cleared.

Pins configured as digital inputs will not convert an

analog input. Analog levels on any pin that is defined as

a digital input (including the ANx pins) may cause the

input buffer to consume current that exceeds the

device specifications.

16.14 Connection Considerations

The analog inputs have diodes to VDD and VSS as ESD

protection. This requires that the analog input be

between V

DD and VSS. If the input voltage exceeds this

range by greater than 0.3V (either direction), one of the

diodes becomes forward biased and it may damage the

device if the input current specification is exceeded.

An external RC filter is sometimes added for

anti-aliasing of the input signal. The R component

should be selected to ensure that the sampling time

requirements are satisfied. Any external components

connected (via high-impedance) to an analog input pin

(capacitor, zener diode, etc.) should have very little

leakage current at the pin.