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| 型号： | TC1232EOE |
| 厂商： | Microchip Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC MPU MONITOR 4.5V 16-SOIC |
| 标准包装： | 47 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 250 ms |
| 电压 - 阀值： | 4.37V，4.62V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
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
forms depending on the period of the ST pin falling
edge and the state of the TD input pin.
is determined by the TD inputs to be 150 ms with TD
connected to ground, 600 ms with TD floating or
ST
t ST
t TD
1200 ms with TD connected to V CC (typ.). The
watchdog timer starts timing-out from the set time
period as soon as RST and RST ar e 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.
RST (when t TD ≤ t TD (min))
RST
(when t TD (min) ≤ t TD ≤ t TD (max))
RST
(when t TD ≥ t TD (max))
RST (when t TD ≤ t TD (min))
RST
(when t TD (min) ≤ t TD ≤ t TD (max))
RST
(when t TD ≥ t TD (max))
“H”
“L”
t TD is the maximum elapsed time between ST high-to-
low transitions (ST is activated by falling edges only),
FIGURE 4-8:
Strobe Input.
which will keep the watchdog timer from forcing the
reset outputs active for a time of t RST . t TD is a function
4.4
Supply Monitor Noise Sensitivity
of the voltage at the TD pin, as tabulated below:
The TC1232 is optimized for fast response to negative-
TABLE 4-1:
WATCHDOG TIMER
PERIODS
t TD
going changes in V DD . Systems with an inordinate
amount of electrical noise on V DD (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
Condition
TD pin = 0V
TD pin = Open
TD pin = VCC
Min
62.5 ms
250 ms
500 ms
Typ
150 ms
600 ms
1200 ms
Max
250 ms
1000 ms
2000 ms
to keep the capacitor lead length short.
TC1232 with a PICmicro ? MCU and the Watchdog
input.
+5V
10 k Ω
3-Terminal
Regulator
+5V
V CC
RST
RESET
(example:
MCP1700 )
0.1
μF
TC1232
ST
PICmicro ?
MCU
I/O
TD TOL GND
FIGURE 4-7:
Watchdog Timer.
? 2005 Microchip Technology Inc.
Preliminary
DS21370C-page 9
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| TC1232EOE713 | 功能描述:监控电路 Microprocessor Montr RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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