參數(shù)資料
型號(hào)： SP791EB
英文描述： Evaluation Board Manual
中文描述： 評(píng)估板手冊(cè)
文件頁(yè)數(shù)： 5/19頁(yè)
文件大?。?/td> 202K
代理商： SP791EB
5
SP791DS/08 SP791 Low Power Microprocessor Supervisory with Battery Switch-Over
Copyright 2000 Sipex Corporation
to select another watchdog-timeout period.
Watchdog-timeout period = 2.1 x (capacitor
value in nF) ms.
Pin 9 — MR — Manual-Reset Input. This input
can be tied to an external momentary
pushbutton switch, or to a logic gate output.
RESET remains low as long as MR is held
low and for 200ms after MR returns high.
Pin 10 — LOWLINE — LOWLINE Output goes
low when V
CC
falls to 150mV above the re-
set threshold. The output can be used to gen-
erate an NMI (nonmaskable interrupt) if the
unregulated supply is inaccessible.
Pin 11 — WDI — Watchdog Input. WDI is a three-
level input. If WDI remains either high or
low for longer than the watchdog timeout
period, WDO goes low. WDO remains low
until the next transition at WDI. Leaving
WDI unconnected disables the watchdog
function. WDI connects to an internal volt-
age divider between V
and GND, which
sets it to mid-supply when left unconnected.
Pin 12 — CE
OUT
— Chip-Enable Output.
CE
OUT
goes low only when CE
IN
is low
and V
CC
is above the reset threshold. If CE
IN
is low when reset is asserted, CE
OUT
will
stay low for 15us or until CE
IN
goes high,
whichever occurs first.
Pin 13 — CE
IN
— Chip-Enable Input. The Input
to chip-enable gating circuit. Connect to
GND or V
OUT
if not used.
Pin 14 — WDO — Watchdog Output. WDO goes
low if WDI remains either high or low longer
than the watchdog timeout period. WDO
returns high on the next transition at WDI.
WDO remains high if WDI is unconnected.
WDO is also high when RESET is asserted.
Pin 15 — RESET — RESET Output goes low
whenever V
falls below the reset thresh-
old. RESET will remain low for 200ms
after V
crosses the reset threshold on
power-up.
Pin 16 — WDPO — Watchdog-Pulse Output.
Upon the absence of a transition at WDI,
WDPO will pulse low for a minimum of
1ms. WDPO precedes WDO by 70ns.
PIN ASSIGNMENTS
Pin 1 — V
— Backup-Battery Input. Connect
to external battery or capacitor and charging
circuit.
Pin 2 —V
— Output Supply Voltage. V
con-
nects to V
when V
is greater than V
and V
is above the reset threshold. When
V
falls below V
BATT
and V
is below the
reset threshold, V
connects to V
. Con-
nect a 0.1
μ
F capacitor from V
OUT
to GND.
Pin 3 — V
— Input Supply Voltage —
+5V input
Pin 4 — GND — Ground reference for all signals
Pin 5 — BATT ON — Battery On Output. Goes
high when V
switches to V
. Goes low
when V
switches to V
. Connect the base
of a PNP through a current-limiting resistor
to BATT ON for V
OUT
current requirements
greater than 250mA.
Pin 6 — PFO — Power-Fail Output. This is the
output of the power-fail comparator. PFO
goes low when PFI is less than1.25V. This is
an uncommitted comparator, and has no ef-
fect on any other internal circuitry.
Pin 7 — PFI — Power-Fail Input. This is the
noninverting input to the power-fail compara-
tor. When PFI is less than 1.25V, PFO goes
low. Connect PFI to GND or V
OUT
when not
used.
Pin 8 — SWT — Set Watchdog-Timeout Input.
Connect this input to V
to select the de-
fault 1.6 sec watchdog timeout period. Con-
nect a capacitor between this input and GND
PINOUT
V
BATT
V
OUT
Vcc
GND
BATT ON
PFO
PFI
SWT
WDPO
RESET
WDO
CE
IN
CE
OUT
WDI
LOWLINE
MR
16
DIP/SO
TOP VIEW
15
14
13
12
11
10
9
1
2
3
4
5
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7
8
C orporation
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參數(shù)描述
SP791EK 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual
SP791EN 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over
SP791EN-L 功能描述:監(jiān)控電路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV 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
SP791EN-L/TR 功能描述:監(jiān)控電路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV 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
SP791EP 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over
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