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参数资料
| 型号： | DS1232 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | MicroMonitor Chip(微监控芯片) |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封装： | 0.300 INCH, DIP-8 |
| 文件页数： | 2/7页 |
| 文件大小： | 59K |
| 代理商： | DS1232 |
DS1232/DS1232S
050798 2/7
OPERATION – POWER MONITOR
The DS1232 detects out–of–tolerance power supply
conditions and warns a processor–based system of im-
pending power failure. When V
CC
falls below a preset
level as defined by TOL (Pin 3), the V
CC
comparator out-
puts the signals RST (Pin 5) and RST (Pin 6). When TOL
is connected to ground, the RST and RST signals be-
come active as V
CC
falls below 4.75 volts. When TOL is
connected to V
CC
, the RST and RST signals become
active as V
CC
falls below 4.5 volts. The RST and RST
are excellent control signals for a microprocessor, as
processing is stopped at the last possible moments of
valid V
CC
. On power–up, RST and RST are kept active
for a minimum of 250 ms to allow the power supply and
processor to stabilize.
OPERATION – PUSHBUTTON RESET
The DS1232 provides an input pin for direct connection
to a pushbutton (Figure 2). The pushbutton reset input
requires an active low signal. Internally, this input is de-
bounced and timed such that RST and RST signals of at
least 250 ms minimum are generated. The 250 ms delay
starts as the pushbutton reset input is released from low
level.
OPERATION – WATCHDOG TIMER
A watchdog timer function forces RST and RST signals
to the active state when the ST input is not stimulated for
a predetermined time period. The time period is set by
the TD input to be typically 150 ms with TD connected to
ground, 600 ms with TD left unconnected, and 1.2 sec-
onds with TD connected to V
CC
. 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 sig-
nals are driven to the active state for 250 ms minimum.
The ST input can be derived from microprocessor ad-
dress signals, data signals, and/or control signals.
When the microprocessor is functioning normally, these
signals would, as a matter of routine, cause the watch-
dog to be reset prior to time–out. To guarantee that the
watchdog timer does not time–out, a high–to–low transi-
tion must occur at or less than the minimum shown in
Table 1. A typical circuit example is shown in Figure 3.
MICROMONITOR BLOCK DIAGRAM
Figure 1
+
–
PBRST
V
TOLERANCE
BIAS
DIGITAL
DIGITAL
DELAY
CTIME–OUT
SENSE
LEVAND
DEBOUNCE
T.C. REFERENCE
RST
RST
ST
V
CC
TOL
TD
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1232+ | 功能描述:监控电路 MicroMonitor Chip 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 |
| DS1232G | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Detector |
| DS1232GN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Detector |
| DS1232L | 制造商:Maxim Integrated Products 功能描述: |
| DS1232LP | 功能描述:监控电路 Low Power MicroMonitor Chip 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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