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

X  

TC1232 Datasheet(PDF) 9 Page - Microchip Technology

No. de pieza TC1232
Descripción Electrónicos  Microprocessor Monitor
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1232 Datasheet(HTML) 9 Page - Microchip Technology

Back Button TC1232 Datasheet HTML 5Page - Microchip Technology TC1232 Datasheet HTML 6Page - Microchip Technology TC1232 Datasheet HTML 7Page - Microchip Technology TC1232 Datasheet HTML 8Page - Microchip Technology TC1232 Datasheet HTML 9Page - Microchip Technology TC1232 Datasheet HTML 10Page - Microchip Technology TC1232 Datasheet HTML 11Page - Microchip Technology TC1232 Datasheet HTML 12Page - Microchip Technology TC1232 Datasheet HTML 13Page - Microchip Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 24 page
background image
 2002-2014 Microchip Technology Inc.
DS20001370E-page 9
TC1232
4.3
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 determined by the TD inputs to be 150 ms with TD
connected to ground, 600 ms with TD floating or
1200 ms with TD connected to VCC (typ.). 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, the RST and RST signals are driven to the
active state for 250 ms, minimum (Figure 4-7).
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 Watchdog Time-out period. One common
technique controls the microprocessor I/O line from two
sections of the program. The software might set the I/O
line high while operating in the Foreground mode and
set it low while in the Background or Interrupt modes. If
both modes do not execute correctly, the Watchdog
Timer issues Reset pulses.
tTD is the maximum elapsed time between ST high-to-
low transitions (ST is activated by falling edges only),
which will keep the Watchdog Timer from forcing the
Reset outputs active for a time of tRST. tTD is a function
of the voltage at the TD pin, as tabulated below:
TABLE 4-1:
WATCHDOG TIMER
PERIODS
Figure 4-7 shows a block diagram for using the
TC1232 with a PIC® MCU and the Watchdog input.
FIGURE 4-7:
Watchdog Timer.
Figure 4-8 shows the expected Reset output pin wave-
forms depending on the period of the ST pin falling
edge and the state of the TD input pin.
FIGURE 4-8:
Strobe Input.
4.4
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 0.1 µF 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.
Condition
tTD
Min.
Typ.
Max.
TD pin = 0V
62.5 ms
150 ms
250 ms
TD pin = Open
250 ms
600 ms
1000 ms
TD pin = VCC
500 ms
1200 ms
2000 ms
VCC
TOL GND
RST
ST
RESET
+5V
TC1232
TD
0.1
10 k
I/O
PIC®
3-Terminal
Regulator
+5V
µF
MCU
(example:
MCP1700)
tST
ST
tTD
RST (when tTD  tTD (min))
“H”
RST
(when tTD(min)  tTD  tTD(max))
(when tTD  tTD(max))
RST
RST (when tTD  tTD(min))
“L”
RST
(when tTD(min)  tTD  tTD(max))
(when tTD  tTD(max))
RST


Número de pieza similar - TC1232

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
TelCom Semiconductor, I...
TC1232 TELCOM-TC1232 Datasheet
65Kb / 6P
   MICROPROCESSOR MONITOR
logo
Microchip Technology
TC1232 MICROCHIP-TC1232 Datasheet
275Kb / 20P
   Microprocessor Monitor
2005
logo
TelCom Semiconductor, I...
TC1232COA TELCOM-TC1232COA Datasheet
65Kb / 6P
   MICROPROCESSOR MONITOR
logo
Microchip Technology
TC1232COA MICROCHIP-TC1232COA Datasheet
282Kb / 20P
   Microprocessor Monitor
2002-2012 10/26/12
TC1232COA713 MICROCHIP-TC1232COA713 Datasheet
282Kb / 20P
   Microprocessor Monitor
2002-2012 10/26/12
More results

Descripción similar - TC1232

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Microchip Technology
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
TelCom Semiconductor, I...
TC1232 TELCOM-TC1232 Datasheet
65Kb / 6P
   MICROPROCESSOR MONITOR
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 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24


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