PIC16F636-I/P Microchip Technology Inc., PIC16F636-I/P Datasheet - Page 70

• Manufacturer Part Number: PIC16F636-I/P
• Description: 14 PIN, 3.5 KB FLASH, 128 RAM, 12 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F636-I/P

• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 12
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 14-pin PDIP
• Programmable Memory: 3.5K Bytes
• Ram Size: 128 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

PIC12F635/PIC16F636/639
7.6
The comparator module also allows the selection of an
internally generated voltage reference for one of the
comparator inputs. The VRCON register (Register 7-3)
controls the voltage reference module shown in
Figure 7-8.
7.6.1
The voltage reference can output 32 distinct voltage
levels, 16 in a high range and 16 in a low range.
The following equation determines the output voltages:
FIGURE 7-8:
DS41232B-page 68
V
DD
Comparator Reference
Comparator
CV
CONFIGURING THE VOLTAGE
REFERENCE
REF
VREN
Input
to
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
VR<3:0>
16-1 Analog
8R
MUX
R
Preliminary
R
16 Stages
EQUATION 7-1:
7.6.2
The voltage reference is V
CV
tested absolute accuracy of the comparator voltage
reference can be found in Section 15.0 “Electrical
Specifications”.
VRR = 1 (low range): CV
VRR = 0 (high range):
CV
REF
REF
output changes with fluctuations in V
R
= (V
VOLTAGE REFERENCE
ACCURACY/ERROR
DD
/4) + (VR<3:0> x V
R
© 2005 Microchip Technology Inc.
DD
REF
derived and therefore, the
= (VR<3:0>/24) x V
8R
DD
/32)
DD
VRR
. The
DD