PIC16F636-E/ST Microchip Technology, PIC16F636-E/ST Datasheet - Page 85

• Manufacturer Part Number: PIC16F636-E/ST
• Description: IC MCU FLASH 2KX14 14TSSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F636-E/ST

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, LVD, POR, WDT
• Number Of I /o: 11
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 14-TSSOP
• For Use With: AC162057 - MPLAB ICD 2 HEADER 14DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -

7.11
The Comparator Voltage Reference module provides
an internally generated voltage reference for the
comparators. The following features are available:
• Independent from Comparator operation
• Two 16-level voltage ranges
• Output clamped to V
• Ratiometric with V
• Fixed Voltage Reference
The VRCON register (Register 7-5) controls the
Voltage Reference module shown in Figure 7-10.
7.11.1
The comparator voltage reference is independent of
the comparator configuration. Setting the VREN bit of
the VRCON register will enable the voltage reference.
7.11.2
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 7-1:
EQUATION 7-2:
The full range of V
the construction of the module. See Figure 7-10.
© 2007 Microchip Technology Inc.
V
V
V
LADDER
RR
RR
V
V
CV
CV
CV
RR
RR
REF
=
=
REF
REF
REF
=
=
0 (high range):
Comparator Voltage Reference
1 (low range):
CV
CV
0 (high range):
1 (low range):
=
=
INDEPENDENT OPERATION
OUTPUT VOLTAGE SELECTION
=
output voltage is determined by the following
voltage reference has 2 ranges with 16
REF
V
REF
(VR<3:0>/24)
(V
DD
LADDER
=
=
SS
or ([V
DD
(VR<3:0>/24)
(V
to V
CV
(INTERNAL CV
CV
(EXTERNAL CV
SS
DD
/4) +
REF
DD
/4) +
REF
REF
+] - [V
(VR<3:0>
cannot be realized due to
V
OUTPUT VOLTAGE
OUTPUT VOLTAGE
LADDER
(VR<3:0> V
REF
-]) or V
V
DD
REF
V
REF
REF
LADDER
+
)
DD
)
/32)
/32)
PIC12F635/PIC16F636/639
7.11.3
The CV
power consumption by configuring VRCON as follows:
• VREN = 0
• VRR = 1
• VR<3:0> = 0000
This allows the comparator to detect a zero-crossing
while not consuming additional CV
7.11.4
The comparator voltage reference is V
therefore, the CV
V
Voltage Reference can be found in Section 15.0 “Elec-
trical Specifications”.
DD
. The tested absolute accuracy of the Comparator
REF
OUTPUT CLAMPED TO V
OUTPUT RATIOMETRIC TO VDD
output voltage can be set to Vss with no
REF
output changes with fluctuations in
REF
DS41232D-page 83
module current.
DD
SS
derived and