PIC16F1938-I/ML Microchip Technology, PIC16F1938-I/ML Datasheet - Page 157

• Manufacturer Part Number: PIC16F1938-I/ML
• Description: IC MCU 8BIT FLASH 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1938-I/ML

• Core Size: 8-Bit
• Program Memory Size: 28KB (16K x 14)
• Oscillator Type: Internal
• Core Processor: PIC
• Speed: 32MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Controller Family/series: PIC16F
• No. Of I/o's: 25
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 1024Byte
• Cpu Speed: 32MHz
• Package: 28QFN EP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 32 MHz
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 25
• Interface Type: I2C/SPI/USART
• On-chip Adc: 11-chx10-bit
• Number Of Timers: 5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
• Programmable voltage reference
• 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 and
comparator
independent programmable gain amplifiers. Each
amplifier can be configured to amplify the reference
voltage by 1x, 2x or 4x.
FIGURE 14-1:
FIGURE 14-2:
© 2009 Microchip Technology Inc.
FIXED VOLTAGE REFERENCE
Independent Gain Amplifiers
modules
CV
Module
PIC16F193X/
PIC16LF193X
REF
VOLTAGE REFERENCE BLOCK DIAGRAM
VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
CDAFVR<1:0>
is
ADFVR<1:0>
Impedance
Reference
routed
FVRRDY
Voltage
Output
FVREN
R
DD
, with 1.024V,
through
2
2
CV
REF
+
_
Preliminary
two
X
X
X
X
X
X
1.024V Fixed
Reference
1
2
4
1
2
4
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 Section 11.0 “Analog-to-Digital Converter
(ADC) Module” for additional information on selecting
the appropriate input channel.
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 comparator module.
Reference Section 12.0 “Comparator Module” for
additional information on selecting the appropriate
input channel.
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
Section 28.0 “Electrical Specifications” for the
minimum delay requirement.
PIC16F193X/LF193X
FVR Stabilization Period
+
–
(To LCD Bias Generator)
(To Comparators, DAC)
(To ADC Module)
FVR_VREF
FVR_BUFFER1
FVR_BUFFER2
Buffered CV
REF
DS41364C-page 157
Output