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PIC18F44J10-I/SOSQTP bảng dữ liệu(HTML) 231 Page - Microchip Technology |
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231 / 368 page  © 2009 Microchip Technology Inc. DS39682E-page 229 PIC18F45J10 FAMILY 19.9 Analog Input Connection Considerations A simplified circuit for an analog input is shown in Figure 19-4. Since the analog pins are connected to a digital output, they have reverse biased diodes to VDD and VSS. The analog input, therefore, must be between VSS and VDD. If the input voltage deviates from this range by more than 0.6V in either direction, one of the diodes is forward biased and a latch-up condition may occur. A maximum source impedance of 10 k Ω is recommended for the analog sources. Any external component connected to an analog input pin, such as a capacitor or a Zener diode, should have very little leakage current. FIGURE 19-4: COMPARATOR ANALOG INPUT MODEL TABLE 19-1: REGISTERS ASSOCIATED WITH COMPARATOR MODULE Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Reset Values on page CMCON C2OUT C1OUT C2INV C1INV CIS CM2 CM1 CM0 49 CVRCON CVREN CVROE CVRR CVRSS CVR3 CVR2 CVR1 CVR0 49 INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 50 PIR2 OSCFIF CMIF — — BCL1IF — — CCP2IF 49 PIE2 OSCFIE CMIE — — BCL1IE — — CCP2IE 49 IPR2 OSCFIP CMIP — — BCL1IP — — CCP2IP 49 PORTA — —RA5 — RA3 RA2 RA1 RA0 50 LATA — — PORTA Data Latch Register (Read and Write to Data Latch) 50 TRISA — — TRISA5 — TRISA3 TRISA2 TRISA1 TRISA0 50 Legend: — = unimplemented, read as ‘0’. Shaded cells are unused by the comparator module. VA RS < 10k AIN CPIN 5 pF VDD VT = 0.6V VT = 0.6V RIC ILEAKAGE ±100 nA VSS Legend: CPIN = Input Capacitance VT = Threshold Voltage ILEAKAGE = Leakage Current at the pin due to various junctions RIC = Interconnect Resistance RS = Source Impedance VA = Analog Voltage Comparator Input |
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