PIC16F1827-E/P Microchip Technology Inc., PIC16F1827-E/P Datasheet - Page 153

• Manufacturer Part Number: PIC16F1827-E/P
• Description: 7 KB Flash, 384 bytes RAM, 32 MHz Int. Osc, 16 I/0, Enhanced Mid Range Core
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F1827-E/P

• A/d Inputs: 12-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 8 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 16
• Interface: CAN/I2C/SPI/UART/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 18-pin PDIP
• Programmable Memory: 7K Bytes
• Ram Size: 384 Bytes
• Speed: 32 MHz
• Timers: 4-8-bit, 1-16-bit
• Voltage, Range: 1.8-5.5 V
• Standby Current (pic16lf182x): 30 nA @ 1.8 V, Typical

17.0
The Digital-to-Analog Converter supplies a variable
voltage reference, ratiometric with the input source,
with 32 selectable output levels.
The input of the DAC can be connected to:
• External V
• V
• FVR (Fixed Voltage Reference)
The output of the DAC can be configured to supply a
reference voltage to the following:
• Comparator positive input
• ADC input channel
• DACOUT pin
• Capacitive Sensing module (CSM)
The Digital-to-Analog Converter (DAC) can be enabled
by setting the DACEN bit of the DACCON0 register.
EQUATION 17-1:
17.2
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
Specifications”.
 2011 Microchip Technology Inc.
IF DACEN = 1
IF DACEN = 0 and DACLPS = 1 and DACR[4:0] = 11111
IF DACEN = 0 and DACLPS = 0 and DACR[4:0] = 00000
V
V
V
V
V
DD
SOURCE
SOURCE
OUT
OUT
OUT
supply voltage
be
=
DIGITAL-TO-ANALOG
CONVERTER (DAC) MODULE
Ratiometric Output Level
=
=
- = V
+ = V


V
V
REF

found
SOURCE
V
SOURCE
SOURCE
SS
DD
pins
, V
REF
+
in
–
+ V
DAC OUTPUT VOLTAGE
–
, or FVR BUFFER 2
Section 29.0
SOURCE
-


DACR 4:0
-----------------------------
2
“Electrical
5




+
V
SOURCE
-
17.1
The DAC has 32 voltage level ranges. The 32 levels
are set with the DACR<4:0> bits of the DACCON1
register.
The DAC output voltage is determined by the equations
in
17.3
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.
an example buffering technique.
Equation
PIC16(L)F1826/27
Output Voltage Selection
DAC Voltage Reference Output
17-1.
DS41391D-page 153
Figure 17-2
shows