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參數(shù)資料
| 型號(hào)： | MAX6886ETP |
| 廠(chǎng)商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Pin-Selectable, Hex Power-Supply Supervisory Circuit |
| 中文描述： | 6-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC20 |
| 封裝： | 5 X 5 MM, 0.8 MM HEIGHT, TQFN-20 |
| 文件頁(yè)數(shù)： | 11/14頁(yè) |
| 文件大?。?/td> | 226K |
| 代理商： | MAX6886ETP |
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Margin Output Disable (
MARGIN
)
MARGIN
allows system-level testing while power sup-
plies exceed the normal operating ranges. Drive
MARGIN
low to hold
RESET
in its existing state while
system-level testing occurs. Leave
MARGIN
uncon-
nected or connect to DBP if unused. An internal 10μA
current source pulls
MARGIN
to DBP.
MARGIN
over-
rides
MR
if both are asserted at the same time.
Watchdog Timer
The MAX6886’s watchdog circuit monitors the μP’s
activity. If the μP does not toggle the watchdog input
(WDI) within the watchdog timeout period,
RESET
asserts. The internal watchdog timer is cleared by a
reset, or by a transition at WDI (which can detect puls-
es as short as 50ns.) The watchdog timer remains
cleared while
RESET
is asserted. The timer starts
counting as soon as
RESET
goes high (see Figure 2).
The MAX6886 features two modes of watchdog timer
operation: normal and initial modes. At power-up, after a
reset event, or after the watchdog timer expires, the ini-
tial watchdog timeout is active (t
WDI
). After the first tran-
sition on WDI, the normal watchdog timeout is active
(t
WD
). The initial and normal watchdog timeouts are
determined by the value of the capacitor connected
between SWT and ground. The initial watchdog timeout
is approximately 64 times the normal watchdog timeout.
Connect a capacitor from SWT to GND to determine the
normal watchdog timeout period according to the fol-
lowing equation:
where t
WD
is in seconds and C
SWT
is in Farads. As an
example, a 1μF capacitor gives a normal timeout peri-
od of 4.68s and an initial watchdog timeout period of
approximately 4.5 minutes. Connect SWT to V
CC
to use
the factory-default watchdog normal and initial timeouts
of 1.6s and 102.4s, respectively. Choose a low-leakage
capacitor for C
SWT
. Disable the watchdog timer by
connecting SWT to GND. WDI is internally pulled down
to GND through a 10μA current sink.
RESET
Output
The reset output is typically connected to the reset
input of a μP. A μP’s reset input starts or restarts the μP
in a known state.
RESET
goes low whenever one or
more input voltage (IN1–IN6) monitors drop below their
respective thresholds, when
MR
is pulled low for a mini-
mum of 1μs, or when the watchdog timer expires.
RESET
remains low for its reset timeout period (t
RP
)
after all assertion-causing conditions have been
cleared (see Figure 2).
C
t
x
SWT
WD
.
=
4 348
10
6
M
Pin-Selectable, Hex Power-Supply
Supervisory Circuit
______________________________________________________________________________________
11
WDI
t
RP
t
RP
*t
WDI
*t
WDI
t
WD
t
D-PO
RESET
V
CC
OR IN1–IN4
2.5V
*t
WDI
IS THE INITIAL WATCHDOG TIMER PERIOD.
Figure 2. Watchdog, Reset, and Power-Up Timing Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6886ETP+ | 功能描述:監(jiān)控電路 Pin-Selectable Hex Power-Sup Supervisor 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 |
| MAX6886ETP+T | 功能描述:監(jiān)控電路 Pin-Selectable Hex Power-Sup Supervisor 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 |
| MAX6886ETP-T | 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 |
| MAX6887AETE | 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 |
| MAX6887AETE+ | 功能描述:監(jiān)控電路 Hex Power-Supply Supervisor 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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