PIC16F1827-I/P Microchip Technology Inc., PIC16F1827-I/P Datasheet - Page 135

• Manufacturer Part Number: PIC16F1827-I/P
• Description: 18 PDIP .300in TUBE, 7 KB Flash, 384 bytes RAM, 32 MHz Int. Osc, 16 I/0, Enhance
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F1827-I/P

• A/d Inputs: 12-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 8 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 16
• Interface: 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
• Temperature Range: –40 to 125 °C
• Timers: 4-8-bit, 1-16-bit
• Voltage, Range: 1.8-5.5 V
• Standby Current (pic16lf182x): 30 nA @ 1.8 V, Typical
• Lead Free Status / Rohs Status: RoHS Compliant part

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
The FVR can be enabled by setting the FVREN bit of
the FVRCON register.
FIGURE 14-1:
 2011 Microchip Technology Inc.
FIXED VOLTAGE REFERENCE
(FVR)
Any peripheral requiring the
VOLTAGE REFERENCE BLOCK DIAGRAM
CDAFVR<1:0>
FVREN
ADFVR<1:0>
(See
Fixed Reference
Table
14-1)
DD
, with 1.024V,
2
2
+
_
1.024V Fixed
Reference
X
X
X
X
X
X
1
2
4
1
2
4
FVRRDY
14.1
The output of the FVR supplied to the ADC,
Comparators, and DAC and CPS is routed through two
independent programmable gain amplifiers. Each
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 and comparator
module. Reference
Converter (DAC) Module”
parator Module”
Sensing 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
Section 30.0 “Electrical Specifications”
minimum delay requirement.
Section 16.0 “Analog-to-Digital Converter
PIC16(L)F1826/27
Independent Gain Amplifiers
FVR Stabilization Period
(To Comparators, DAC, CPS)
(To ADC Module)
FVR BUFFER1
FVR BUFFER2
for additional information.
for additional information.
Section 16.0 “Digital-to-Analog
and
Section 27.0 “Capacitive
and
Section 18.0 “Com-
DS41391D-page 135
for the