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MCP6542 Datasheet(PDF) 18 Page - Microchip Technology |
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MCP6542 Datasheet(HTML) 18 Page - Microchip Technology |
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18 / 46 page  MCP6541/1R/1U/2/3/4 DS21696G-page 18 2011 Microchip Technology Inc. FIGURE 4-3: The MCP6541/1R/1U/2/3/4 comparators’ internal hysteresis eliminates output chatter caused by input noise voltage. 4.2 Push-Pull Output The push-pull output is designed to be compatible with CMOS and TTL logic, while the output transistors are configured to give rail-to-rail output performance. They are driven with circuitry that minimizes any switching current (shoot-through current from supply-to-supply) when the output is transitioned from high-to-low, or from low-to-high (see Figures 2-15, 2-18, 2-32 through 2-36 for more information). 4.3 MCP6543 Chip Select (CS) The MCP6543 is a single comparator with Chip Select (CS). 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 out- put 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 and thus reduces 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 NON-INVERTING CIRCUIT Figure 4-4 shows a non-inverting circuit for single- supply applications using just two resistors. The resulting hysteresis diagram is shown in Figure 4-5. FIGURE 4-4: Non-inverting circuit with hysteresis for single-supply. FIGURE 4-5: Hysteresis Diagram for the Non-Inverting Circuit. The trip points for Figures 4-4 and 4-5 are: -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 VREF VIN VOUT MCP654X VDD R1 RF + - VOUT High-to-Low Low-to-High VDD VOH VOL VSS VSS VDD VTHL VTLH VIN |
Similar Part No. - MCP6542 |
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Similar Description - MCP6542 |
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