PIC16F/LF1946/47
16.4 DAC Voltage Reference Output
The DAC can be output to the DACOUT pin by setting
the DACOE bit of the DACCON0 register to ‘1’.
Selecting the DAC reference voltage for output on the
DACOUT pin automatically overrides the digital output
buffer and digital input threshold detector functions of
that pin. Reading the DACOUT pin when it has been
configured for DAC reference voltage output will
always return a ‘0’.
Due to the limited current drive capability, a buffer must
be used on the DAC voltage reference output for
external connections to DACOUT. Figure 16-3 shows
an example buffering technique.
FIGURE 16-2:
DIGITAL-TO-ANALOG CONVERTER BLOCK DIAGRAM
Digital-to-Analog Converter (DAC)
FVR BUFFER2
VSRC+
VDD
DACR<4:0>
5
VREF+
R
R
DACPSS<1:0>
2
R
R
R
DACEN
DACLPS
32
Steps
DAC
(To Comparator and
ADC Modules)
R
R
R
DACOUT
DACOE
DACNSS
VREF-
VSS
VSRC-
2010 Microchip Technology Inc.
Preliminary
DS41414A-page 169
MICROCHIP [ MICROCHIP ]
