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參數(shù)資料
| 型號(hào)： | DS1832 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 3.3 Volt MicroMonitor Chip(3.3 V微監(jiān)控芯片) |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, PDIP-8 |
| 文件頁(yè)數(shù)： | 2/7頁(yè) |
| 文件大?。?/td> | 59K |
| 代理商： | DS1832 |
DS1832
062698 2/7
OPERATION – POWER MONITOR
The DS1832 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, the V
CC
comparator outputs the
signals RST and RST. When TOL is connected to
ground, the RST and RST signals become active as V
CC
falls below 2.98 volts. When TOL is connected to V
CC
,
the RST and RST signals become active as V
CC
falls be-
low 2.64 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 DS1832 provides an input pin for direct connection
to a pushbutton reset (see Figure 2). The pushbutton re-
set input requires an active low signal. Internally, this in-
put is debounced and timed such that RST and RST sig-
nals of at least 250 ms minimum are generated. The
250 ms delay commences as the pushbutton reset input
is released from the low level.
OPERATION – WATCHDOG TIMER
The watchdog timer function forces RST and RST sig-
nals active when the ST input is not clocked within the
predetermined time period. The timeout period is deter-
mined by the condition of the TD pin. if TD is connected
to ground the minimum watchdog timeout would be
62.5 ms, TD floating would yield a minimum timeout of
250 ms, and TD connected to V
CC
would provide a time-
out of 500 ms minimum. Timeout of the watchdog starts
when RST and RST become 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 active for a mini-
mum of 250 ms. The ST input can be derived from many
microprocessor outputs. The most typical signals used
are the microprocessor address signals, data signals or
control signals. When the microprocessor functions
normally, these signals would, as a matter of routine,
cause the watchdog to be reset prior to time–out. To
guarantee that the watchdog timer does not time–out, a
high–to–low transition must occur at or less than the
minimum times shown in Table 1. A typical circuit exam-
ple is shown in Figure 4.
The DS1832 watchdog function cannot be disabled.
The watchdog strobe input must be strobed to avoid a
watchdog timeout and reset.
MICROMONITOR BLOCK DIAGRAM
Figure 1
TOL
T.C. REFERENCE
LEVEL SENSE
AND
DEBOUNCE
VOLTAGE
SENSE
DIGITAL
DELAY
TD
TIME-OUT
COMPARATOR
ST
PBRST
V
CC
V
TOLERANCE
BIAS
+
–
V
CC
V
CC
RST
RST
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1833 | 5V EconoReset(5V Econo監(jiān)控芯片) |
| DS1834 | Dual EconoReset with Pushbutton(帶復(fù)位按鈕的雙路Econo復(fù)位電路) |
| DS1834A | Dual EconoReset with Pushbutton(帶復(fù)位按鈕的雙路Econo復(fù)位電路) |
| DS1834D | Dual EconoReset with Pushbutton(帶復(fù)位按鈕的雙路Econo復(fù)位電路) |
| DS1836A | 5V MicroManager(5V微管理器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1832+ | 功能描述:監(jiān)控電路 3.3V MicroMonitor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1832N | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Voltage Detector |
| DS1832S | 功能描述:監(jiān)控電路 3.3V MicroMonitor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1832S/T&R | 制造商:Maxim Integrated Products 功能描述:3.3V MICROMONITOR 8PIN SOIC-T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MICROMONITOR 3.3V 8-SOIC |
| DS1832S/T&R | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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