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MCP6547T-I/SL Datasheet(PDF) 14 Page - Microchip Technology |
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MCP6547T-I/SL Datasheet(HTML) 14 Page - Microchip Technology |
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14 / 32 page  MCP6546/6R/6U/7/8/9 DS21714E-page 14 © 2006 Microchip Technology Inc. FIGURE 4-3: The MCP6546/7/8/9 comparators’ internal hysteresis eliminates output chatter caused by input noise voltage. 4.2 Open-Drain Output The open-drain output is designed to make level- shifting and wired-OR logic easy to implement. The output can go as high as 10V for 9V battery-powered applications. The output stage minimizes switching cur- rent (shoot-through current from supply-to-supply) when the output changes state. See Figures 2-15, 2-18 and 2-37 through 2-41, for more information. 4.3 MCP6548 Chip Select (CS) The MCP6548 is a single comparator with a Chip Select (CS) pin. When CS is pulled high, the total current consumption drops to 20 pA (typ.). 1 pA (typ.) flows through the CS pin, 1 pA (typ.) flows through the output pin and 18 pA (typ.) flows through the VDD pin, as shown in Figure 1-1. When this happens, the comparator output is put into a high-impedance state. By pulling CS low, the comparator is enabled. If the CS pin is left floating, the comparator will not operate properly. Figure 1-1 shows the output voltage and supply current response to a CS pulse. The internal CS circuitry is designed to minimize glitches when cycling the CS pin. This helps conserve power, which is especially important in battery-powered applications. 4.4 Externally Set Hysteresis Greater flexibility in selecting hysteresis, or input trip points, is achieved by using external resistors. Input offset voltage (VOS) is the center (average) of the (input-referred) low-high and high-low trip points. Input hysteresis voltage (VHYST) is the difference between the same trip points. Hysteresis reduces output chattering when one input is slowly moving past the other, thus reducing dynamic supply current. It also helps in systems where it is best not to cycle between states too frequently (e.g., air conditioner thermostatic control). 4.4.1 INVERTING CIRCUIT Figure 4-4 shows an inverting circuit for a single-supply application using three resistors, besides the pull-up resistor. The resulting hysteresis diagram is shown in Figure 4-5. FIGURE 4-4: Inverting circuit with hysteresis. FIGURE 4-5: Hysteresis diagram for the inverting circuit. In order to determine the trip voltages (VTHL and VTLH) for the circuit shown in Figure 4-4, R2 and R3 can be simplified to the Thevenin equivalent circuit with respect to VDD, as shown in Figure 4-6. FIGURE 4-6: Thevenin Equivalent Circuit. -3 -2 -1 0 1 2 3 4 5 6 7 8 Time (100 ms/div) -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 VOUT VIN– VDD = 5.0V Hysteresis VIN VOUT MCP654X VDD R2 RF R3 VPU RPU VDD IOL IRF IPU VOUT High-to-Low Low-to-High VOH VOL VSS VSS VDD VTLH VTHL VIN VPU VTLH = trip voltage from low to high VTHL = trip voltage from high to low V23 VOUT MCP654X VPU R23 RF + - RPU |
Similar Part No. - MCP6547T-I/SL |
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Similar Description - MCP6547T-I/SL |
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