PIC12F1840T-I/SN Microchip Technology, PIC12F1840T-I/SN Datasheet - Page 141

• Manufacturer Part Number: PIC12F1840T-I/SN
• Description: 7 KB Flash, 256 Bytes RAM, 32 MHz Int. Osc, 6 I/0, Enhanced Mid Range Core 8 SOI
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 12Fr

Specifications of PIC12F1840T-I/SN

• Core Processor: RISC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 5
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.3 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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 (CPS) module
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 & DACLPS = 1 & DACR[4:0] = 11111
IF DACEN = 0 & DACLPS = 0 & DACR[4:0] = 00000
V
V
V
DD
V
V
SOURCE
SOURCE
OUT
OUT
OUT
supply voltage
be
DIGITAL-TO-ANALOG
CONVERTER (DAC) MODULE
Ratiometric Output Level
=
=
=
+ = V
- = V


REF
found
V
V

V
SOURCE
SOURCE
SOURCE
SS
pins
DD
, V
in
REF
+
DAC OUTPUT VOLTAGE
–
+ V
–
, or FVR BUFFER 2
Section 30.0
SOURCE
-


DACR 4:0
-----------------------------
“Electrical
2
5


Preliminary


+
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 following
equations:
-
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.
Output Voltage Selection
DAC Voltage Reference Output
PIC12(L)F1840
Figure 17-2
DS41441B-page 141
shows