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TC32MEZB Datenblatt(PDF) 6 Page - Microchip Technology

Teilenummer TC32MEZB
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

TC32MEZB Datenblatt(HTML) 6 Page - Microchip Technology

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TC32M
DS21402C-page 6
© 2006 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 .
t
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 V
STH, VSTL)
PB Closed
PB Open
RS
VIH
tRST
VIL
RS
VIL
VIH
VDD
VRST
tRST
tRPD
5V
5V
Reset
PO.1
Reset
Microcontroller
Microprocessor
R2,10 k
Ω
Microcontroller Example
Reset
Decoder
Address
Reset
R1, 10 k
Ω
Microprocessor Example
RS
TC32M
RS
TC32M
R1, 10 k
Ω
R2, 10 k
Ω


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