Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

TC1232COA Datasheet(PDF) 4 Page - TelCom Semiconductor, Inc

No. de pieza TC1232COA
Descripción Electrónicos  MICROPROCESSOR MONITOR
Download  6 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  TELCOM [TelCom Semiconductor, Inc]
Página de inicio  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC1232COA Datasheet(HTML) 4 Page - TelCom Semiconductor, Inc

  TC1232COA Datasheet HTML 1Page - TelCom Semiconductor, Inc TC1232COA Datasheet HTML 2Page - TelCom Semiconductor, Inc TC1232COA Datasheet HTML 3Page - TelCom Semiconductor, Inc TC1232COA Datasheet HTML 4Page - TelCom Semiconductor, Inc TC1232COA Datasheet HTML 5Page - TelCom Semiconductor, Inc TC1232COA Datasheet HTML 6Page - TelCom Semiconductor, Inc  
Zoom Inzoom in Zoom Outzoom out
 4 / 6 page
background image
5-22
TELCOM SEMICONDUCTOR, INC.
V
CC
TOL GND
RST
ST
RESET
+5V
TC1232
TD
0.1
µF
10K
I/O
MICROPROCESSOR
3 -TERMINAL
REGULATOR
+5V
VCC
TOL
PB RST
GND
RST
ST
I/O
MICROPROCESSOR
RESET
+5V
TC1232
TD
Figure 2. Watchdog Timer
Figure 1. Push-button Reset
mode and set it low while in the background or interrupt
mode. If both modes do not execute correctly, the watchdog
timer issues reset pulses.
Supply Monitor Noise Sensitivity
The TC1232 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 or 0.1µF bypass capacitor to reduce
detection sensitivity. This capacitor should be installed as
close to the TC1232 as possible to keep the capacitor lead
length short.
DETAILED DESCRIPTION
Power Monitor
The TC1232 detects out-of-tolerance power supply
conditions and warns a processor-based system of an
impending power failure. When VCC is detected as below the
preset level defined by TOL, the VCC comparator outputs the
signals RST and RST. If TOL is connected to ground, the
RST and RST signals become active as VCC falls below 4.75
volts. If TOL is connected to VCC, the RST and RST become
active as VCC falls below 4.5 volts. Because the processing
is stopped at the last possible moment of valid VCC, the RST
and RST are excellent control signals for a
µP. The reset
outputs will remain in their active states until VCC has been
continuously in-tolerance for a minimum of 250msec allow-
ing the power supply and
µP to stabilize before RST is
released.
Push-button Reset Input
The debounced manual reset input (PB RST) manually
forces the reset outputs into their active states. Once
PB RST has been low for a time tPBD, the push-button delay
time, the reset outputs go active. The reset outputs remain
in their active states for a minimum of 250msec after PB RST
rises above VIH (Figure 3).
A mechanical push-button or active logic signal can
drive the PB RST input. The debounced input ignores input
pulses less than 1msec and is guaranteed to recognize
pulses of 20msec or greater. No external pull-up resistor is
required because the PB RST input has an internal pull-up
to VCC of approximately 100µA.
Watchdog Timer
When the ST input is not stimulated for a preset time
period, the watchdog timer function forces RST and RST
signals to the active state. The preset time period is deter-
mined by the TD inputs to be 150msec with TD connected
to ground, 600msec with TD floating, or 1200msec with TD
connected to VCC, typical. The watchdog timer starts timing
out from the set time period as soon as RST and RST are
inactive. If a high-to-low transition occurs on the ST input pin
prior to time-out, the watchdog timer is reset and begins to
time-out again. If the watchdog timer is allowed to time-out,
then the RST and RST signals are driven to the active state
for 250msec minimum (Figure 2).
The software routine that strobes ST is critical. The code
must be in a section of software that is executed frequently
enough so the time between toggles is less than the watch-
dog time-out period. One common technique controls the
µP
I/O line from two sections of the program. The software
might set the I/O line high while operating in the foreground
TC1232
MICROPROCESSOR MONITOR


Número de pieza similar - TC1232COA

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Microchip Technology
TC1232COA MICROCHIP-TC1232COA Datasheet
282Kb / 20P
   Microprocessor Monitor
2002-2012 10/26/12
TC1232COA MICROCHIP-TC1232COA Datasheet
583Kb / 24P
   Microprocessor Monitor
10/28/13
TC1232COA713 MICROCHIP-TC1232COA713 Datasheet
282Kb / 20P
   Microprocessor Monitor
2002-2012 10/26/12
TC1232COA713 MICROCHIP-TC1232COA713 Datasheet
583Kb / 24P
   Microprocessor Monitor
10/28/13
More results

Descripción similar - TC1232COA

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Microchip Technology
TC1232 MICROCHIP-TC1232_14 Datasheet
583Kb / 24P
   Microprocessor Monitor
10/28/13
TC1232 MICROCHIP-TC1232 Datasheet
275Kb / 20P
   Microprocessor Monitor
2005
logo
ON Semiconductor
NCP1232 ONSEMI-NCP1232 Datasheet
95Kb / 8P
   Microprocessor Monitor
May, 2000 ??Rev. 0
logo
Microchip Technology
TC1232 MICROCHIP-TC1232_13 Datasheet
282Kb / 20P
   Microprocessor Monitor
2002-2012 10/26/12
logo
California Micro Device...
CM1232 CALMIRCO-CM1232 Datasheet
171Kb / 4P
   CMOS MICROPROCESSOR MONITOR CIRCUIT
logo
Maxim Integrated Produc...
ICL7665CPA MAXIM-ICL7665CPA Datasheet
114Kb / 12P
   Microprocessor Voltage Monitor with
19-0001; Rev 2; 8/97
logo
National Semiconductor ...
LM79 NSC-LM79 Datasheet
481Kb / 31P
   Microprocessor System Hardware Monitor
LM78 NSC-LM78 Datasheet
424Kb / 31P
   Microprocessor System Hardware Monitor
logo
Maxim Integrated Produc...
MAX1232 MAXIM-MAX1232 Datasheet
174Kb / 6P
   MAX 1232 Microprocessor Monitor
19-3899; Rev 1; 2/91
logo
List of Unclassifed Man...
MTV003 ETC-MTV003 Datasheet
224Kb / 13P
   Microprocessor Compatible Monitor Controller
More results


Html Pages

1 2 3 4 5 6


Datasheet Descarga

Go To PDF Page


Enlace URL




Política de Privacidad
ALLDATASHEET.ES
¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Intercambio de Enlaces   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com