PIC16F1937-E/MV Microchip Technology, PIC16F1937-E/MV Datasheet - Page 155

• 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

14.0
The Fixed Voltage Reference, or FVR, is a stable
voltage reference, independent of V
2.048V or 4.096V selectable output levels. The output
of the FVR can be configured to supply a reference
voltage to the following:
• ADC input channel
• ADC positive reference
• Comparator positive input
• Digital-to-Analog Converter (DAC)
• Capacitive Sensing (CPS) module
• LCD bias generator
The FVR can be enabled by setting the FVREN bit of
the FVRCON register.
14.1
The output of the FVR supplied to the ADC,
Comparators, DAC and CPS is routed through two
independent programmable gain amplifiers. Each
FIGURE 14-1:
 2008-2011 Microchip Technology Inc.
FIXED VOLTAGE REFERENCE
(FVR)
Independent Gain Amplifiers
VOLTAGE REFERENCE BLOCK DIAGRAM
CDAFVR<1:0>
ADFVR<1:0>
FVRRDY
FVREN
DD
2
2
, with 1.024V,
+
_
X
X
X
X
X
X
1.024V Fixed
Reference
1
2
4
1
2
4
amplifier can be configured to amplify the reference
voltage by 1x, 2x or 4x, to produce the three possible
voltage levels.
The ADFVR<1:0> bits of the FVRCON register are
used to enable and configure the gain amplifier settings
for the reference supplied to the ADC module. Refer-
ence
(ADC) Module”
The CDAFVR<1:0> bits of the FVRCON register are used
to enable and configure the gain amplifier settings for the
reference supplied to the DAC, CPS and comparator
module. Reference
Converter (DAC)
Module”
Module”
14.2
When the Fixed Voltage Reference module is enabled, it
requires time for the reference and amplifier circuits to
stabilize. Once the circuits stabilize and are ready for use,
the FVRRDY bit of the FVRCON register will be set. See
in the applicable Electrical Specifications Chapter for
the minimum delay requirement.
PIC16(L)F1934/6/7
Section 15.0 “Analog-to-Digital Converter
FVR Stabilization Period
(To LCD Bias Generator)
for additional information.
and
(To Comparators, DAC)
Section 26.0 “Capacitive Sensing (CPS)
(To ADC Module)
FVR VREF
FVR BUFFER1
FVR BUFFER2
for additional information.
Module”,
Section 17.0 “Digital-to-Analog
Section 18.0 “Comparator
DS41364E-page 155