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PIC18F4550ESOSQTP Datasheet(PDF) 281 Page - Microchip Technology |
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PIC18F4550ESOSQTP Datasheet(HTML) 281 Page - Microchip Technology |
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281 / 438 page  © 2009 Microchip Technology Inc. DS39632E-page 279 PIC18F2455/2550/4455/4550 22.9 Analog Input Connection Considerations A simplified circuit for an analog input is shown in Figure 22-4. 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 22-4: COMPARATOR ANALOG INPUT MODEL TABLE 22-1: REGISTERS ASSOCIATED WITH COMPARATOR MODULE VA RS < 10k AIN CPIN 5 pF VDD VT = 0.6V VT = 0.6V RIC ILEAKAGE ±500 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 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 55 CVRCON CVREN CVROE CVRR CVRSS CVR3 CVR2 CVR1 CVR0 55 INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 53 PIR2 OSCFIF CMIF USBIF EEIF BCLIF HLVDIF TMR3IF CCP2IF 56 PIE2 OSCFIE CMIE USBIE EEIE BCLIE HLVDIE TMR3IE CCP2IE 56 IPR2 OSCFIP CMIP USBIP EEIP BCLIP HLVDIP TMR3IP CCP2IP 56 PORTA —RA6(1) RA5 RA4 RA3 RA2 RA1 RA0 56 LATA —LATA6(1) LATA5 LATA4 LATA3 LATA2 LATA1 LATA0 56 TRISA — TRISA6(1) TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 56 Legend: — = unimplemented, read as ‘0’. Shaded cells are unused by the comparator module. Note 1: PORTA<6> and its direction and latch bits are individually configured as port pins based on various oscillator modes. When disabled, these bits read as ‘0’. |
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