Datasheet
Table Of Contents
- Device Features
- 1.0 Electrical Characteristics
- 2.0 Typical Performance Curves
- 3.0 PIN Description
- 4.0 Operational Description
- 5.0 Application Information
- 5.1 Supply Monitor Noise Sensitivity
- 5.2 Conventional Voltage Monitoring
- 5.3 Using in PIC® Microcontroller, ICSP™ Applications
- 5.4 Modifying The Trip Point, VTRIP
- 5.5 MOSFET Low-Drive Protection
- 5.6 Low-Power Applications
- 5.7 Controllers and Processors With Bidirectional I/O Pins
- 5.8 RESET Signal Integrity During Power-Down
- 6.0 Standard Device Offerings
- 7.0 Development Tools
- 8.0 Packaging Information
- Appendix A: Revision History
- Product Identification System
- Trademarks
- Worldwide Sales and Service

2005-2012 Microchip Technology Inc. DS21985D-page 35
MCP131X/2X
5.0 APPLICATION INFORMATION
This section shows application-related information that
may be useful for your particular design requirements.
5.1 Supply Monitor Noise Sensitivity
The MCP131X/2X devices are optimized for fast
response to negative-going changes in V
DD
. Systems
with an inordinate amount of electrical noise on V
DD
(such as systems using relays) may require a 0.01 µF
or 0.1 µF bypass capacitor to reduce detection
sensitivity. This capacitor should be installed as close
to the MCP131X/2X as possible to keep the capacitor
lead length short.
FIGURE 5-1: Typical Application Circuit
with Bypass Capacitor.
5.2 Conventional Voltage Monitoring
Figure 5-2 and Figure 5-3 show the MCP131X/2X in
conventional voltage monitoring applications.
FIGURE 5-2: Battery Voltage Monitor.
FIGURE 5-3: Power Good Monitor.
5.3 Using in PIC
®
Microcontroller,
ICSP™ Applications
Figure 5-4 shows the typical application circuit for using
the MCP132X for a voltage supervisory function when
the PIC
®
microcontroller will be programmed via the In-
Circuit Serial Programming™ (ICSP™) feature. Addi-
tional information is available in TB087, “Using Voltage
Supervisors with PIC
®
Microcontroller Systems which
Implement In-Circuit Serial Programming™”
(DS91087).
FIGURE 5-4: Typical Application Circuit
for PIC
®
Microcontroller with the ICSP™ Feature.
MCP131X/2X
V
DD
RST
V
SS
0.1 µF
RST
WDI
MR
V
DD
RST
V
SS
BATLOW
MCP131X/2X
+
––
V
DD
RST
V
SS
Power Good
MCP131X/2X
+
–
Pwr
Sply
Note: This operation can only be done using the
device with the Open-Drain RST
pin
(MCP1320, MCP1321, and MCP1322).
Devices that have the internal pull-up
resistor are not recommended due to the
current path of the internal pull-up resistor.
Note: It is recommended that the current into the
RST
pin be current limited by a 1 k
resistor.
MCP132X
V
DD
V
DD
/V
PP
V
DD
RST
MCLR
Reset input)
(Active-Low)
V
SS
V
SS
PIC
®
Microcontroller
R
PU
0.1 µF
1k