TC1270AMAVRCTR datasheet(22/42 Pages) MICROCHIP

22 / 42 page

TC1270A/70AN/71A

DS20002035F-page 22

 2007-2022 Microchip Technology Inc. and its subsidiaries

5.0

APPLICATION INFORMATION

This section presents application-related information

that may be useful for your particular design require-

ments.

5.1

Supply Monitor Noise Sensitivity

The TC127XA devices are optimized for fast responses

to negative-going changes in VDD. A system with an

inordinate amount of electrical noise on VDD (such as a

system 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 TC127XA

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 TC127XA 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 TC1270AN for voltage supervisory function when

the PIC microcontroller will be programmed via the

In-Circuit Serial Programming™ (ICSP™) feature.

Additional information is available in the Microchip

Technical Brief TB087, “Using Voltage Supervisors with

PICmicro® Microcontroller Systems which Implement

In-Circuit Serial Programming™” (DS91087).

FIGURE 5-4:

Typical Application Circuit

for PIC Microcontroller with the ICSP Feature.

TC127XA

VDD

RST

VSS

0.1 µF

RST

VDD

RST

VSS

BATLOW

TC127XA

––

VDD

RST

VSS

Power Good

TC127XA

–

Pwr

Sply

Note:

This operation can only be done using the

device that has an Open-Drain RST pin

(TC1270AN).

Note:

It is recommended that the current into the

RST pin is current that is limited by a 1 k



resistor.

TC1270AN

VDD

VDD/VPP

VDD

RST

MCLR

Reset input)

(Active-Low)

VSS

PIC®

Microcontroller

RPU

0.1 µF



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