MCP6566UT-ESLASHST datasheet(18/44 Pages) MICROCHIP

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MCP6566/6R/6U/7/9

DS22143B-page 18

It is also possible to connect the diodes to the left of the

resistors R1 and R2. In this case, the currents through

the diodes D1 and D2 need to be limited by some other

mechanism. The resistor then serves as in-rush current

limiter; the DC current into the input pins (VIN+ and

VIN–) should be very small.

A significant amount of current can flow out of the

inputs when the common mode voltage (VCM) is below

ground (VSS); see Figure 4-3. Applications that are

high impedance may need to limit the useable voltage

range.

4.1.3

PHASE REVERSAL

The MCP6566/6R/6U/7/9 comparator family uses

CMOS transistors at the input. They are designed to

prevent phase inversion when the input pins exceed

the supply voltages. Figure 2-3 shows an input voltage

exceeding both supplies with no resulting phase

inversion.

4.2

Open-Drain Output

The open-drain output is designed to make level-shift-

ing and wired-OR logic easy to implement. The output

stage minimizes switching current (shoot-through

current

from

supply-to-supply)

when

the

output

changes state. See Figures 2-15, 2-18, 2-35 and 2-36,

for more information.

4.3

Externally Set Hysteresis

Greater flexibility in selecting hysteresis (or input trip

points) is achieved by using external resistors.

Hysteresis reduces output chattering when one input is

slowly moving past the other. It also helps in systems

where it is best not to cycle between high and low

states too frequently (e.g., air conditioner thermostatic

control). Output chatter also increases the dynamic

supply current.

4.3.1

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:

EQUATION 4-1:

VREF

VIN

VOUT

VDD

VPU

RPU

MCP656X

VOUT

High-to-Low

Low-to-High

VDD

VOH

VOL

VSS

VDD

VTHL VTLH

VIN

TLH

REF

-------

⎝⎠

⎜⎟

⎛⎞

-------

⎝⎠

⎜⎟

⎛⎞

–

THL

REF

-------

⎝⎠

⎜⎟

⎛⎞

-------

⎝⎠

⎜⎟

⎛⎞

–

Where:

VTLH

trip voltage from low-to-high

VTHL

trip voltage from high-to-low

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