MCP6544-I/SN Microchip Technology, MCP6544-I/SN Datasheet - Page 12

• Manufacturer Part Number: MCP6544-I/SN
• Description: Push-Pull Output Sub-Microamp Comparators
• Manufacturer: Microchip Technology

MCP6541/2/3/4
3.4.1
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:
hysteresis for single-supply.
FIGURE 3-4:
Non-Inverting Circuit.
The trip points for Figures 3-3 and 3-4 are:
EQUATION
DS21696C-page 12
V
V
V
V
V
V
TLH
THL
OH
DD
OL
SS
V
V
IN
= trip voltage from low to high
= trip voltage from high to low
SS
V
V THL
V TLH
High-to-Low
V
REF
OUT
NON-INVERTING CIRCUIT
R
=
=
1
V REF 1
V REF 1
V
THL
Non-inverting circuit with
Hysteresis Diagram for the
+
-
MCP654X
V
+
+
TLH
V
------ -
R F
------ -
R F
R 1
DD
R 1
Low-to-High
R
–
–
F
V OH
V OL
V
------ -
R F
R 1
------ -
R F
R 1
DD
V
OUT
V
IN
3.4.2
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:
Hysteresis.
FIGURE 3-6:
Inverting Circuit.
In order to determine the trip voltages (V
for the circuit shown in Figure 3-5, R
simplified to the Thevenin equivalent circuit with
respect to V
FIGURE 3-7:
V
V
V
V
DD
OH
OL
SS
V
V
23
SS
V
IN
R
R
Low-to-High
V
2
3
OUT
V
INVERTING CIRCUIT
DD
DD
, as shown in Figure 3-7.
R
23
V
MCP654X
TLH
Inverting Circuit With
Hysteresis Diagram for the
Thevenin Equivalent Circuit.
V
+
-
MCP654X
DD
V
2003 Microchip Technology Inc.
THL
V
DD
R
F
High-to-Low
V
R
SS
F
2
and R
THL
V
V
DD
OUT
and V
V
3
OUT
can be
V
IN
TLH
)