PIC16F1937-E/MV Microchip Technology, PIC16F1937-E/MV Datasheet - Page 173

• Manufacturer Part Number: PIC16F1937-E/MV
• Description: 14KB Flash, 512B RAM, 256B EEPROM, LCD, 1.8-5.5V 40 UQFN 5x5x0.5mm TUBE
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1937-E/MV

• Processor Series: PIC16F
• Core: PIC
• Program Memory Type: Flash
• Program Memory Size: 14 KB
• Data Ram Size: 256 B
• Interface Type: MI2C, SPI, EUSART
• Number Of Timers: 5
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: UQFN-40
• Development Tools By Supplier: MPLAB IDE Software
• Minimum Operating Temperature: - 40 C
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 36
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Lead Free Status / Rohs Status: Details

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 be found in the applicable Electrical Specifications
chapter.
 2008-2011 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
V
V
DD
SOURCE
SOURCE
OUT
OUT
OUT
supply voltage
=
DIGITAL-TO-ANALOG
CONVERTER (DAC) MODULE
Ratiometric Output Level
=
=
- = V
+ = V


V
V
REF

SOURCE
V
SOURCE
SOURCE
SS
DD
pins
, V
REF
+
–
+ V
DAC OUTPUT VOLTAGE
–
, or FVR BUFFER 2
SOURCE
-


DACR 4:0
-----------------------------
2
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 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.
PIC16(L)F1934/6/7
Output Voltage Selection
DAC Voltage Reference Output
Figure 17-2
DS41364E-page 173
shows