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PIC12F683 Datasheet(PDF) 50 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 50 Page - Microchip Technology |
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50 / 148 page  PIC12F683 DS41211B-page 48 Preliminary 2004 Microchip Technology Inc. 8.1 Comparator Operation A single comparator is shown in Figure 8-1 along with the relationship between the analog input levels and the digital output. When the analog input at VIN+ is less than the analog input VIN-, the output of the comparator is a digital low level. When the analog input at VIN+ is greater than the analog input VIN-, the output of the comparator is a digital high level. The shaded areas of the output of the comparator in Figure 8-1 represent the uncertainty due to input offsets and response time. The polarity of the comparator output can be inverted by setting the CINV bit (CMCON0<4>). Clearing CINV results in a non-inverted output. A complete table showing the output state versus input conditions and the polarity bit is shown in Table 8-1. TABLE 8-1: OUTPUT STATE VS. INPUT CONDITIONS FIGURE 8-1: SINGLE COMPARATOR 8.2 Analog Input Connection Considerations A simplified circuit for an analog input is shown in Figure 8-2. 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 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 8-2: ANALOG INPUT MODEL Note: To use CIN+ and CIN- pins as analog inputs, the appropriate bits must be programmed in the CMCON0 (19h) register. Input Conditions CINV COUT VIN- > VIN+ 00 VIN- < VIN+ 01 VIN- > VIN+ 11 VIN- < VIN+ 10 Note 1: When reading the GPIO register, all pins configured as analog inputs will read as a ‘0’. Pins configured as digital inputs will convert as analog inputs according to the input specification. 2: Analog levels on any pin defined as a digital input may cause the input buffer to consume more current than is specified. – + VIN+ VIN- Output VIN– VIN+ Output Output VIN+ VIN- VA 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 Rs < 10K |
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