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TC32MCZB Datenblatt(PDF) 6 Page - Microchip Technology

Teilenummer TC32MCZB
Bauteilbeschribung  ECONOMONITOR?? 3-Pin System Supervisor with Power Supply Monitor and Watchdog
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC32MCZB Datenblatt(HTML) 6 Page - Microchip Technology

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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-
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 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 VSTH,VSTL)
PB Closed
PB Open
RS
VIH
tRST
VIL
RS
VIL
VIH
VDD
VRST
tRST
tRPD
5V
5V
RESET
PO.1
RESET
Microcontroller
Microprocessor
R2,10k
Microcontroller Example
RESET
Decoder
Address
RESET
R1, 10k
Microprocessor Example
RS
TC32M
RS
TC32M
R1, 10k
R2, 10k


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