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參數(shù)資料
| 型號(hào)： | MAX691A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Microprocessor Supervisory Circuits(帶看門狗復(fù)位、片選和支持備用電池的復(fù)位器) |
| 中文描述： | 微處理器監(jiān)控電路 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大小： | 164K |
| 代理商： | MAX691A |
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M
Mic roproc essor S upervisory Circ uits
______________________________________________________________________________________
11
Power-Fail Output
The Power-Fail Output (–——O) goes low when PFI goes
below 1.25V. It typically sinks 3.2mA with a saturation
pulled to V
OUT
.
Battery-Bac kup Mode
Two conditions are required to switch to battery-back-
up mode: 1) V
CC
must be below the reset threshold,
and 2) V
CC
must be below VBATT. Table 2 lists the sta-
tus of the inputs and outputs in battery-backup mode.
Battery On Output
The Battery On (BATT ON) output indicates the status
of the internal V
/battery-switchover comparator,
which controls the internal V
and VBATT switches.
For V
greater that VBATT (ignoring the small hystere-
sis effect), BATT ON typically sinks 3.2mA at 0.1V satu-
ration voltage. In battery-backup mode, this terminal
sources approximately 10μA from V
. Use BATT ON
to indicate battery-switchover status or to supply base
drive to an external pass transistor for higher-current
applications (see Typical Operating Circuit.
Input S upply V oltage
The Input Supply Voltage (V
CC
) should be a regulated
5V. V
CC
connects to V
OUT
via a parallel diode and a
large PMOS switch. The switch carries the entire cur-
rent load for currents less than 250mA. The parallel
diode carries any current in excess of 250mA. Both the
switch and the diode have impedances less than 1
each. The maximum continuous current is 250mA, but
power-on transients may reach a maximum of 1A.
MAX691A
MAX693A
MAX800L
MAX800M
CE IN
C
LOAD
CE OUT
GND
5V
50
OUTPUT
IMPEDANCE
V
CC
VBATT
2.8V
MAX691A
MAX693A
MAX800L
MAX800M
PFI
PFO
GND
5V
V
CC
VBATT
2.0V to 5.5V
LOW BATT
Figure 6. CE Propagation Delay Test Circuit
Figure 7. Low-Battery Indicator
PIN
1
NAME
VBATT
STATUS
Supply Current is 1μA max.
2
V
OUT
V
OUT
is connected to VBATT through an
internal PMOS switch.
3
V
CC
Battery switchover comparator monitors
V
CC
for active switchover.
GND 0V, 0V reference for all signals.
4
GND
5
BATT ON
Logic high. The open-circuit output is
equal to V
OUT
.
Logic Low*
OSC IN is ignored.
OSC SEL is ignored.
6
7
8
–—O—W——N—
OSC IN
OSC SEL
9
PFI
The power-fail comparator remains
active in the battery-backup mode for
V
CC
≥
VBATT - 1.2V typ.
10
–——O
The power-fail comparator remains
active in the battery-backup mode for
V
CC
≥
VBATT - 1.2V typ. Below this volt-
age, PFO is forced low.
11
WDI
Watchdog is ignored.
12
–—OUT
Logic high. The open-circuit voltage is
equal to V
OUT
.
High Impedance.
13
–—IN
14
–W——O
Logic high. The open-circuit voltage is
equal to V
OUT
.
Logic low*
High Impedance*
15
16
–————
RESET
Table 2. Input and Output Status in Battery-Backup
Mode
*V
must be below the reset threshold to enter battery-backup
mode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX691AC/D | 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 |
| MAX691ACPE | 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 |
| MAX691ACPE+ | 功能描述:監(jiān)控電路 MPU 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 |
| MAX691ACSE | 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 |
| MAX691ACSE+ | 功能描述:監(jiān)控電路 MPU 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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