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Comparator Peripheral Labs
? Fixed 0.6 reference option
? Output clamped to V SS
The CV REF has 2 ranges with 16 voltage levels in each range. Range selection is
controlled by the CV REF Range Selection (VRR) bit in the VRCON (Voltage Reference
Control Register) along with the CV REF Value Selection bits (VR<3:0>). The Value
Selection bits hold a value based upon some simple calculations to set the internal
reference voltage. The CV REF voltage is determined using Equation 4-1:
EQUATION 4-1:
CV REF OUTPUT VOLTAGE
VRR = 1 (Low-Range):
CV REF = (VR<3:0>/24) x V DD
VRR = 0 (High-Range):
CV REF = (V DD /4) + (VR<3:0> x V DD /32)
This lab will implement the low-range calculation by setting the VRR bit in VRCON
equal to 1. Equation 4-2 demonstrates how to calculate the VR<3:0> values, using the
low-range method, to obtain a 2.5V internal reference. If higher resolutions are
required, the high-range method should be used (see Section 8.10.2 in the PIC16F690
Data Sheet (DS-41262).
EQUATION 4-2:
CALCULATING A 2.5V INTERNAL REFERENCE
(LOW-RANGE METHOD)
VRR = 1 (Low-Range):
CV REF = (VR<3:0>/24) x V DD
Known: desired CV REF = 2.5V, V DD approximately 5V
Therefore:
2.5V = (VR<3:0>/24 x 5V
2.5V/5V = (VR<3:0>/24)
(2.5V/5V) x 24 = VR<3:0>
VR<3:0> = 12 10 or 1100 2
VR0 = 0
VR1 = 0
VR2 = 1
VR3 = 1
The Initialize() from the previous lab now must configure both the Comparator 1
peripheral and the CV REF as follows:
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Turn on Comparator 1
Select CV REF the non-inverting reference for Comparator 1
Continue to use the C12IN0- pin as the inverting reference
Turn on CV REF
Select the low-range feature
Set the CV REF Value Selection bits as per the calculation in Equation 4-2.
Changes to the PICDEM? Development Board configuration schematic for this lab are
shown in Figure 4-3.
? 2009 Microchip Technology Inc.
DS41369A-page 65
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