TC1270ASVRCTR datasheet(23/40 Pages) MICROCHIP

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DS22035B-page 23

TC1270A/70AN/71A

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 TC127XA devices are optimized for fast response

to negative-going changes in VDD. Systems with an

inordinate amount of electrical noise on VDD (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 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 TB087, “Using

Voltage Supervisors with PICmicro® Microcontroller

Systems which Implement In-Circuit Serial Program-

ming™”, 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 with the Open-Drain RST pin

(TC1270AN).

Note:

It is recommended that the current into the

RST pin be current 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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