PIC16F684-ISL

Manufacturer Part NumberPIC16F684-ISL
ManufacturerMicrochip Technology Inc.
PIC16F684-ISL datasheets
 


Specifications of PIC16F684-ISL

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PIC16F684
8.6
Comparator Reference
The comparator module also allows the selection of an
internally generated voltage reference for one of the
comparator inputs. The VRCON register (Register 8-3)
controls the voltage reference module shown in
Figure 8-6.
8.6.1
CONFIGURING THE VOLTAGE
REFERENCE
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:
EQUATION 8-1:
VRR = 1 (low range): CV
= (VR3:VR0/24)
REF
VRR = 0 (high range):
CV
= (V
/4) + (VR3:VR0
REF
DD
FIGURE 8-6:
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
8R
V
DD
16-1 Analog
MUX
VREN
CV
to
REF
Comparator
Input
VR3:VR0
DS41202C-page 60
8.6.2
VOLTAGE REFERENCE
ACCURACY/ERROR
The full range of V
the construction of the module. The transistors on the
top and bottom of the resistor ladder network
(Figure 8-6) keep CV
V
. The exception is when the module is disabled by
DD
clearing the VREN bit (VRCON<7>). When disabled,
the reference voltage is V
and the VRR (VRCON<5>) bit is set. This allows the
comparators to detect a zero-crossing and not
consume CV
The voltage reference is V
CV
output changes with fluctuations in V
REF
tested absolute accuracy of the comparator voltage
Reference can be found in Section 15.0 “Electrical
V
X
DD
Specifications”.
V
/32)
X
DD
16 Stages
R
R
R
VREN
VR3:VR0 = ‘0000’
VRR
Preliminary
to V
cannot be realized due to
SS
DD
from approaching V
REF
SS
when VR<3:0> is ‘0000’
SS
module current.
REF
derived and therefore, the
DD
. The
DD
R
VRR
8R
 2004 Microchip Technology Inc.
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