PIC16F631-I/P Microchip Technology Inc., PIC16F631-I/P Datasheet - Page 107

• Manufacturer Part Number: PIC16F631-I/P
• Description: MCU, 8-Bit, 1KW Flash, 64 RAM, 18 I/O, PDIP-20
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F631-I/P

• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 128 Bytes
• Input Output: 18
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 20-pin PDIP
• Programmable Memory: 1.75K Bytes
• Ram Size: 64 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

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 VP6EN bit of the VRCON
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 the electrical specifications section for the
minimum delay requirement.
FIGURE 8-8:
© 2007 Microchip Technology Inc.
To Comparators
and ADC module
V
CV
DD
To Comparators
and ADC module
REF
FixedRef
FIXED VOLTAGE REFERENCE
FIXED VOLTAGE REFERENCE
STABILIZATION PERIOD
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
C1VREN
C2VREN
8R
PIC16F631/677/685/687/689/690
16-1 Analog
MUX
0.6V
R
VR<3:0>
DD
Fixed Voltage
Reference
, with
(1)
R
EN
16 Stages
Note 1: Care should be taken to ensure V
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 C1VREN bit of the VRCON register enables
current to flow in the CV
the CV
bit selects the fixed voltage for use by C1.
Setting the C2VREN bit of the VRCON register enables
current to flow in the CV
the CV
bit selects the fixed voltage for use by C2.
When both the C1VREN and C2VREN bits are cleared,
current flow in the CV
minimizing the power drain of the voltage reference
peripheral.
REF
REF
R
within the comparator common mode input
range. See Section 17.0 “Electrical Specifica-
tions” for more detail.
voltage for use by C1. Clearing the C1VREN
voltage for use by C2. Clearing the C2VREN
VOLTAGE REFERENCE
SELECTION
R
REF
REF
REF
Sleep
HFINTOSC enable
VP6EN
voltage divider is disabled
voltage divider and selects
voltage divider and selects
8R
DS41262D-page 105
REF
REF
remains
V
or fixed
RR