PIC16 datasheet(150/418 Pages) MICROCHIP

150 / 418 page

PIC16(L)F1508/9

DS40001609C-page 150

 2011-2013 Microchip Technology Inc.

16.1

Output Voltage Selection

The DAC has 32 voltage level ranges. The 32 levels

are set with the DACR<4:0> bits of the DACxCON1

The DAC output voltage can be determined by using

Equation 16-1.

16.2

Ratiometric Output Level

The DAC output value is derived using a resistor ladder

with each end of the ladder tied to a positive and

negative voltage reference input source. If the voltage

of either input source fluctuates, a similar fluctuation will

result in the DAC output value.

The value of the individual resistors within the ladder

can be found in Table 29-16.

16.3

DAC Voltage Reference Output

The unbuffered DAC voltage can be output to the

DACxOUTn pin(s) by setting the respective DACOEn

bit(s) of the DACxCON0 register. Selecting the DAC

reference voltage for output on either DACxOUTn pin

automatically overrides the digital output buffer, the

weak pull-up and digital input threshold detector

functions of that pin.

Reading the DACxOUTn pin when it has been

configured for DAC reference voltage output will

always return a ‘0’.

16.4

Operation During Sleep

When the device wakes up from Sleep through an

interrupt or a Watchdog Timer time-out, the contents of

the DACxCON0 register are not affected. To minimize

current consumption in Sleep mode, the voltage

reference should be disabled.

16.5

Effects of a Reset

A device Reset affects the following:

• DACx is disabled.

•DACX output voltage is removed from the

DACxOUTn pin(s).

• The DACR<4:0> range select bits are cleared.

EQUATION 16-1:

DAC OUTPUT VOLTAGE

Note:

The unbuffered DAC output (DACxOUTn)

is not intended to drive an external load.

IF DACEN = 1

DACx_output

VSOURCE+VSOURCE-

–

 DACR 4:0



-----------------------------







VSOURCE-

Note:

See the DACxCON0 register for the available VSOURCE+ and VSOURCE- selections.

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