TC32M_13 datasheet(6/14 Pages) MICROCHIP

6 / 14 page

TC32M

DS21402D-page 6

 2001-2012 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 500 msec. Reference Figure .

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-

going changes in VDD. Systems with an inordinate

amount of electrical noise on VDD (such as systems

using relays), may require a 0.01

F 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:

TC32M Hardware Connections (R1, R2 Chosen To Meet V

STH, VSTL)

PB Closed

PB Open

VIH

tRST

VIL

VIH

VDD

VRST

tRST

tRPD

Reset

PO.1

Reset

Microcontroller

Microprocessor

R2,10 k

Microcontroller Example

Reset

Decoder

Address

Reset

R1, 10 k

Microprocessor Example

TC32M

R1, 10 k

R2, 10 k

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