MCP6541 datasheet(12/28 Pages) MICROCHIP

12 / 28 page

MCP6541/2/3/4

DS21696C-page 12

 2003 Microchip Technology Inc.

3.4.1

NON-INVERTING CIRCUIT

Figure 3-3 shows a non-inverting circuit for single-

supply applications using just two resistors. The

resulting hysteresis diagram is shown in Figure 3-4.

FIGURE 3-3:

Non-inverting circuit with

hysteresis for single-supply.

FIGURE 3-4:

Hysteresis Diagram for the

Non-Inverting Circuit.

The trip points for Figures 3-3 and 3-4 are:

EQUATION

3.4.2

INVERTING CIRCUIT

Figure 3-5 shows an inverting circuit for single-supply

using three resistors. The resulting hysteresis diagram

is shown in Figure 3-6.

FIGURE 3-5:

Inverting Circuit With

Hysteresis.

FIGURE 3-6:

Hysteresis Diagram for the

Inverting Circuit.

In order to determine the trip voltages (VTHL and VTLH)

for the circuit shown in Figure 3-5, R2 and R3 can be

simplified to the Thevenin equivalent circuit with

respect to VDD, as shown in Figure 3-7.

FIGURE 3-7:

Thevenin Equivalent Circuit.

VREF

VIN

VOUT

MCP654X

VDD

VOUT

High-to-Low

Low-to-High

VDD

VOH

VOL

VSS

VDD

VTHL VTLH

VIN

VTLH

VREF 1

-------







VOL

------







–

VTHL

VREF 1

-------







VOH

-------







–

VTLH = trip voltage from low to high

VTHL = trip voltage from high to low

VIN

VOUT

MCP654X

VDD

VOUT

High-to-Low

Low-to-High

VDD

VOH

VOL

VSS

VDD

VTLH VTHL

VIN

V23

VOUT

MCP654X

VDD

R23

VSS

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