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TC1232EUA

更新时间: 2024-11-24 01:06:11
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美国微芯 - MICROCHIP /
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24页 583K
描述
Microprocessor Monitor

TC1232EUA 数据手册

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TC1232  
Microprocessor Monitor  
Features:  
General Description:  
• Precision Voltage Monitor:  
- Adjustable +4.5V or +4.75V  
• Reset Pulse Width – 250 ms minimum  
• No External Components  
The TC1232 is a fully-integrated processor supervisor  
that provides three important functions to safeguard  
processor sanity: precision power on/off Reset control,  
Watchdog Timer and external Reset override.  
On power-up, the TC1232 holds the processor in the  
Reset state for a minimum of 250 ms after VCC is within  
tolerance to ensure a stable system start-up.  
• Adjustable Watchdog Timer:  
- 150 ms, 600 ms or 1.2s  
• Operating Voltage 4.0V to 5.5V  
Microprocessor sanity is monitored by the on-board  
watchdog circuit. The microprocessor must provide a  
periodic low-going signal on the ST input. Should the  
processor fail to supply this signal within the selected  
time-out period (150 ms, 600 ms or 1200 ms), an out-  
of-control processor is indicated and the TC1232  
issues a processor Reset as a result.  
• Debounced Manual Reset Input for External  
Override  
Block Diagram  
VCC  
RST  
RST  
Tolerance  
Select  
The outputs of the TC1232 are immediately driven  
active when the PB input is brought low by an external  
push button switch or other electronic signal. When  
connected to a push button switch, the TC1232  
provides contact debounce.  
+
TOL  
(5% or 10%)  
+
+
VREF  
The TC1232 is packaged in a space-saving 8-Pin PDIP  
or SOIC package, a 16-Pin SOIC (wide) package and  
requires no external components.  
Reset  
Generator  
PB RST  
TD  
Debounce  
Watchdog  
Timebase  
Select  
Watchdog  
Timer  
ST  
Package Types  
8-Pin PDIP  
8-Pin SOIC  
16-Pin SOIC (Wide)  
NC  
PB RST  
NC  
1
2
3
4
5
6
7
8
16 NC  
V
V
8
PB RST  
TD  
1
2
3
4
8
7
6
5
PB RST  
TD  
1
2
3
4
CC  
CC  
VCC  
15  
ST  
7
6
5
ST  
14 NC  
13 ST  
12 NC  
11 RST  
10 NC  
C1232  
TC1232  
TOL  
RST  
RST  
TOL  
RST  
RST  
TD  
TC1232  
GND  
NC  
GND  
TOL  
NC  
GND  
9
RST  
Device Features  
RST pin  
RST pin  
Minimum  
Reset  
Active Time  
(ms)  
WDI Input  
Typical  
Timeouts (ms)  
Trip Points  
Active  
(Max)  
MR  
Input  
Device  
Type  
Pull-up Active  
Resistor Level  
Type  
Level  
TC1232 Open-drain External Low  
Push-pull  
High  
4.75V  
or 4.5V  
250  
150, 600 or  
1200  
Yes  
2002-2014 Microchip Technology Inc.  
DS20001370E-page 1  

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