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MCP6544-I/ST Datasheet(PDF) 16 Page - Microchip Technology |
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MCP6544-I/ST Datasheet(HTML) 16 Page - Microchip Technology |
16 / 34 page ![]() MCP6541/1R/1U/2/3/4 DS21696E-page 16 © 2006 Microchip Technology Inc. 4.4.2 INVERTING CIRCUIT Figure 4-6 shows an inverting circuit for single-supply using three resistors. The resulting hysteresis diagram is shown in Figure 4-7. FIGURE 4-6: Inverting Circuit With Hysteresis. FIGURE 4-7: Hysteresis Diagram for the Inverting Circuit. In order to determine the trip voltages (VTHL and VTLH) for the circuit shown in Figure 4-6, R2 and R3 can be simplified to the Thevenin equivalent circuit with respect to VDD, as shown in Figure 4-8. FIGURE 4-8: Thevenin Equivalent Circuit. Where: Using this simplified circuit, the trip voltage can be calculated using the following equation: EQUATION 4-2: Figure 2-20 and Figure 2-23 can be used to determine typical values for VOH and VOL. 4.5 Bypass Capacitors With this family of comparators, the power supply pin (VDD for single supply) should have a local bypass capacitor (i.e., 0.01 µF to 0.1 µF) within 2 mm for good edge rate performance. 4.6 Capacitive Loads Reasonable capacitive loads (e.g., logic gates) have little impact on propagation delay (see Figure 2-31). The supply current increases with increasing toggle frequency (Figure 2-19), especially with higher capacitive loads. 4.7 Battery Life In order to maximize battery life in portable applications, use large resistors and small capacitive loads. Avoid toggling the output more than necessary. Do not use Chip Select (CS) frequently to conserve start-up power. Capacitive loads will draw additional power at start-up. VIN VOUT MCP654X VDD R2 RF R3 VDD VOUT High-to-Low Low-to-High VDD VOH VOL VSS VSS VDD VTLH VTHL VIN V23 VOUT MCP654X VDD R23 RF + - VSS R23 R2R3 R2 R3 + ------------------ = V23 R3 R2 R3 + ------------------ V DD × = VTHL VOH R23 R23 RF + ----------------------- ⎝⎠ ⎜⎟ ⎛⎞ V23 RF R23 RF + ---------------------- ⎝⎠ ⎛⎞ + = VTLH VOL R23 R23 RF + ----------------------- ⎝⎠ ⎜⎟ ⎛⎞ V23 RF R23 RF + ---------------------- ⎝⎠ ⎛⎞ + = VTLH = trip voltage from low to high VTHL = trip voltage from high to low |
Similar Part No. - MCP6544-I/ST |
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Similar Description - MCP6544-I/ST |
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