TC32M

DS21402B-page 6

© 2002 Microchip Technology Inc.

3.4

External Override Reset Control

A built-in debounce circuit allows a push-button switch

(PB) or other electronic signal to be wire-ORed to this

pin as an external RESET override control. The

external RESET is required to be an active low signal.

Internally, this input is timed to provide a minimum

RESET pulse width of 500msec. Reference Figure 3-2.

FIGURE 3-2:

RS PULLED LOW BY

PUSH-BUTTON RESET

FIGURE 3-3:

POWER UP/DOWN

RESET TIMING

3.5

Supply Monitor Noise Sensitivity

The TC32M is optimized for fast response to negative-

using relays), may require a 0.01

µF bypass capacitor

to reduce detection sensitivity. This capacitor should be

installed as close to the TC32M as possible to keep the

capacitor lead length short.

FIGURE 3-4:

PB Closed

PB Open

RS

RS

5V

5V

RESET

PO.1

RESET

Microcontroller

Microprocessor

R2,10k

Ω

Microcontroller Example

RESET

Decoder

Address

RESET

R1, 10k

Ω

Microprocessor Example

RS

TC32M

RS

TC32M

R1, 10k

Ω

R2, 10k

Ω