TC32M Datasheet, PDF(6/12 Page) TelCom Semiconductor, Inc – ECONOMONITOR - 3-PIN SYSTEM SUPERVISOR WITH POWER SUPPLY MONITOR AND WATCHDOG

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

TC32M Datasheet, PDF (6/12 Pages) TelCom Semiconductor, Inc – ECONOMONITOR - 3-PIN SYSTEM SUPERVISOR WITH POWER SUPPLY MONITOR AND WATCHDOG

◁

TC32M

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

PB Closed

PB Open

FIGURE 3-3:

VDD

VRST

POWER UP/DOWN

RESET TIMING

tRPD

VIL

tRST

VIH

VIL

FIGURE 3-4:

VIH

tRST

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 0.01ÂµF 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.

TC32M HARDWARE CONNECTIONS (R1, R2 CHOSEN TO MEET VSTH, VSTL)

R1, 10kâ¦

R2,10kâ¦

Microcontroller

PO.1

TC32M

RESET

Microcontroller Example

R1, 10kâ¦

TC32M

R2, 10kâ¦

Decoder

RESET

Microprocessor Example

Microprocessor

Address

RESET

DS21402B-page 6

▷