PIC16F882-I/SP Microchip Technology, PIC16F882-I/SP Datasheet - Page 96

• Manufacturer Part Number: PIC16F882-I/SP
• Description: IC PIC MCU FLASH 2KX14 28DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F882-I/SP

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 28-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 24
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: EUSART/MSSP
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 28
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM164120-3
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 11-ch x 10-bit
• A/d Bit Size: 10 bit
• A/d Channels Available: 11
• Height: 3.3 mm
• Length: 34.67 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Width: 7.24 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DVA18XP280 - DEVICE ADAPTER 18F2220 PDIP 28LD
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16F882/883/884/886/887
8.10
The comparator voltage reference module provides an
internally generated voltage reference for the compara-
tors. The following features are available:
• Independent from Comparator operation
• Two 16-level voltage ranges
• Output clamped to V
• Ratiometric with V
• Fixed Reference (0.6V)
The VRCON register (Register 8-5) controls the
voltage reference module shown in Figure 8-8.
The voltage source is selectable through both ends of
the 16 connection resistor ladder network. Bit VRSS of
the VRCON register selects either the internal or
external voltage source.
The PIC16F882/883/884/886/887 allows the CV
signal to be output to the RA2 pin of PORTA under
certain configurations only. For more details, see
Figure 8-9.
8.10.1
The comparator voltage reference is independent of
the comparator configuration. Setting the VREN bit of
the VRCON register will enable the voltage reference.
8.10.2
The
voltage levels in each range. Range selection is
controlled by the VRR bit of the VRCON register. The
16 levels are set with the VR<3:0> bits of the VRCON
register.
The CV
equations:
EQUATION 8-1:
The full range of V
the construction of the module. See Figure 8-8.
DS41291F-page 94
V
V
V
LADDER
RR
RR
CV
CV
CV
=
REF
=
REF
REF
REF
0 (high range):
Comparator Voltage Reference
1 (low range):
=
=
INDEPENDENT OPERATION
OUTPUT VOLTAGE SELECTION
=
output voltage is determined by the following
voltage reference has 2 ranges with 16
V
(VR<3:0>/24)
(V
DD
LADDER
SS
or ([V
DD
to V
CV
SS
/4) +
REF
DD
REF
+] - [V
×
cannot be realized due to
(VR<3:0>
V
OUTPUT VOLTAGE
LADDER
REF
-]) or V
×
V
REF
LADDER
+
/32)
REF
8.10.3
The CV
power consumption by clearing the FVREN bit of the
VRCON register.
This allows the comparator to detect a zero-crossing
while not consuming additional CV
8.10.4
The comparator voltage reference is V
therefore, the CV
V
Voltage Reference can be found in Section 17.0
“Electrical Specifications”.
8.10.5
The fixed voltage reference is independent of V
a nominal output voltage of 0.6V. This reference can be
enabled by setting the FVREN bit of the SRCON
register to ‘1’. This reference is always enabled when
the HFINTOSC oscillator is active.
8.10.6
When the fixed voltage reference module is enabled, it
will require some time for the reference and its amplifier
circuits to stabilize. The user program must include a
small delay routine to allow the module to settle. See
Section 17.0 “Electrical Specifications” for the
minimum delay requirement.
8.10.7
Multiplexers on the output of the voltage reference
module enable selection of either the CV
voltage reference for use by the comparators.
Setting the C1RSEL bit of the CM2CON1 register
enables current to flow in the CV
and selects the CV
the C1RSEL bit selects the fixed voltage for use by C1.
Setting the C2RSEL bit of the CM2CON1 register
enables current to flow in the CV
and selects the CV
the C2RSEL bit selects the fixed voltage for use by C2.
When both the C1RSEL and C2RSEL bits are cleared,
current flow in the CV
minimizing the power drain of the voltage reference
peripheral.
DD
Note:
. The tested absolute accuracy of the Comparator
REF
OUTPUT CLAMPED TO V
Depending on the application, additional
components may be required for a zero
cross circuit. Reference TB3013, “Using
the ESD Parasitic Diodes on Mixed Signal
Microcontrollers” (DS93013), for more
information.
OUTPUT RATIOMETRIC TO VDD
FIXED VOLTAGE REFERENCE
FIXED VOLTAGE REFERENCE
STABILIZATION PERIOD
VOLTAGE REFERENCE
SELECTION
output voltage can be set to Vss with no
REF
REF
REF
output changes with fluctuations in
REF
voltage for use by C1. Clearing
voltage for use by C2. Clearing
© 2009 Microchip Technology Inc.
voltage divider is disabled
REF
REF
REF
module current.
DD
voltage divider
voltage divider
SS
REF
derived and
DD
or fixed
, with