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參數(shù)資料
| 型號： | MCP1322T |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Voltage Supervisor |
| 中文描述： | 電壓監(jiān)控 |
| 文件頁數(shù)： | 23/44頁 |
| 文件大?。?/td> | 924K |
| 代理商： | MCP1322T |
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2005 Microchip Technology Inc.
DS21985A-page 23
MCP131X/2X
4.0
OPERATIONAL DESCRIPTION
For many of today’s microcontroller applications, care
must be taken to prevent low-power conditions that can
cause many different system problems. The most
common causes are brown-out conditions, where the
system supply drops below the operating level momen-
tarily. The second most common cause is when a
slowly
decaying
power
microcontroller to begin executing instructions without
sufficient voltage to sustain volatile memory (RAM),
thus producing indeterminate results. Figure 4-1 shows
a typical application circuit.
supply
causes
the
The MCP131X/2X family is voltage supervisor devices
designed to keep a microcontroller in Reset until the
system voltage has reached and stabilized at the
proper level for reliable system operation. These
devices also operate as protection from brown-out
conditions when the system supply voltage drops
below a safe operating level.
Some MCP131X/2X family members include a Watch-
dog Timer feature that after being enabled (by a falling
edge on the WDI pin), monitors the WDI pin for falling
edges. If an edge transition is not detected within the
expected timeframe, the MCP131X/2X devices will
force the Reset pin active. This is useful to ensure that
the embedded system’s Host Controller program is
operating as expected.
Some MCP131X/2X family members include a Manual
Reset feature that allows a push button switch to be
directly connected to the MCP131X/2X devices (on the
MR pin). This allows the system to easily be reset from
the external control of the push button switch.
A superset block diagram is shown in Figure 4-2, with
device specific block diagrams shown in Figure 4-3
through Figure 4-12.
FIGURE 4-1:
Typical Application Circuit.
FIGURE 4-2:
Family Block Diagram
V
DD
V
DD
MCLR
(Reset input)
(active-low)
V
SS
PICmicro
Microcontroller
R
PU
(1)
Note 1:
Resistor R
PU
may be required with the
MCP1320, MCP1321 or MCP1322 due
to the open-drain output.
Resistor R
PU
may not be required with
the MCP1316M, MCP1318M or
MCP1319M due to the internal pull-up
resistor.
The MCP1316, MCP1317, MCP1318
and MCP1319 do not require the
external pull-up resistor.
2:
Not all devices offer the active-high
Reset output pin.
0.1
μ
F
MCP13XX
V
DD
RST
V
SS
RST
(2)
WDI
I/O
To system
device that
requires active-
high resets
Push button
switch
MR
V
DD
Comparator
+
–
Output
Driver
RST
Reference
Voltage
V
SS
RST
Noise Filter
Watchdog
MR
WDI
Note:
Features available depend on the device.
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| MCP1317 | Voltage Supervisor |
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| MCP1322T-29LE/OT | 功能描述:監(jiān)控電路 Act low OD Act high P-P RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(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 |
| MCP1322T-29LE/OTV25 | 制造商:Microchip Technology Inc 功能描述: |
| MCP1322T-29LE/OTVAO25 | 制造商:Microchip Technology Inc 功能描述: |
| MCP1322T-46EE/OT | 功能描述:監(jiān)控電路 ACTIVE LO/HI O-D PP RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(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 |
| MCP1322T-46LE/OT | 功能描述:監(jiān)控電路 Act low OD Act high P-P RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(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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