TC1232_13 datasheet(8/20 Pages) MICROCHIP

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TC1232

DS21370D-page 8

Preliminary

 2002-2012 Microchip Technology Inc.

4.2

Push Button Reset Input

The debounced manual reset input (PB RST) manually

forces the reset outputs into their active states.

Figure 4-5 shows a block diagram for using the

TC1232 with a push button switch.

Once PB RST has been low for a time tPBD (the push-

button delay time), the reset outputs go active. The

reset outputs remain in their active states for a

minimum of 250 ms after PB RST rises above VIH.

Figure 4-6 shows a waveform for the push button

switch input and the reset pins output.

A mechanical push button or active logic signal can

drive the PB RST input. The debounced input ignores

input pulses less than 1 ms and recognizes pulses of

20 ms or greater. No external pull-up resistor is

required because the PB RST input has an internal

pull-up to VCC of approximately 100 µA.

FIGURE 4-5:

Push Button Reset and

Watchdog Timer.

FIGURE 4-6:

Push Button Reset –

PB RST Input.

VCC

TOL

PB RST

GND

RST

I/O

Reset

+5V

TC1232

Microprocessor

RST

VIL

tPB

RST

tPBD

VIH

tRST

PB RST

The debounced PB RST input ignores input pulses less

than 1 ms and is designed to recognize pulses of

20 ms or greater.

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