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PIC12F683 Datasheet(PDF) 54 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 54 Page - Microchip Technology |
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54 / 148 page  PIC12F683 DS41211B-page 52 Preliminary 2004 Microchip Technology Inc. 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 8-5. 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: 8.6.2 VOLTAGE REFERENCE ACCURACY/ERROR The full range of VSS to VDD cannot be realized due to the construction of the module. The transistors on the top and bottom of the resistor ladder network (Figure 8-5) keep CVREF from approaching VSS or VDD. The excep- tion is when the module is disabled by clearing the VREN bit (VRCON<7>). When disabled, the reference voltage is VSS when VR<3:0> is ‘0000’ and the VRR (VRCON<5>) bit is set. This allows the comparator to detect a zero-crossing and not consume CVREF module current. The voltage reference is VDD derived and therefore, the CVREF output changes with fluctuations in VDD. The tested absolute accuracy of the comparator voltage reference can be found in Section 15.0 “Electrical Specifications”. FIGURE 8-5: COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM VRR = 1 (Low Range): CVREF = (VR3:VR0/24) x VDD VRR = 0 (High Range): CVREF = (VDD/4) + (VR3:VR0 X VDD/32) VRR 8R VR<3:0> 16-1 Analog 8R RR RR CVREF to 16 Stages Comparator Input VREN VDD MUX VR<3:0> = 0000 VREN VRR |
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