PIC16F616 Microchip Technology Inc., PIC16F616 Datasheet - Page 70

• Manufacturer Part Number: PIC16F616
• Description: 14-pin Flash-based, 8-bit Cmos Microcontrollers
• Manufacturer: Microchip Technology Inc.

PIC16F610/616/16HV610/616
8.11
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 8-6) controls the
voltage reference module shown in Figure 8-9.
8.11.1
The comparator voltage reference is independent of
the comparator configuration. Setting the FVREN bit of
the VRCON register will enable the voltage reference.
8.11.2
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 8-1:
The full range of V
the construction of the module. See Figure 8-9.
DS41288C-page 68
V
V
CV
RR
RR
REF
REF
=
=
Comparator Voltage Reference
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
REF
=
=
SS
DD
(VR<3:0>/24)
(V
to V
CV
SS
DD
DD
/4) +
REF
cannot be realized due to
OUTPUT VOLTAGE
(VR<3:0> V
×
V
DD
×
DD
/32)
Preliminary
8.11.3
The fixed voltage reference output voltage can be set
to Vss with no power consumption by clearing the
FVREN bit of the VRCON register (FVREN = 0). This
allows the comparator to detect a zero-crossing while
not consuming additional module current.
8.11.4
The comparator voltage reference is V
therefore, the CV
V
Voltage Reference can be found in Section 15.0
“Electrical Specifications”.
DD
. The tested absolute accuracy of the Comparator
OUTPUT CLAMPED TO V
OUTPUT RATIOMETRIC TO VDD
REF
output changes with fluctuations in
© 2007 Microchip Technology Inc.
DD
SS
derived and