參數(shù)資料
型號(hào)： ASM805LEPA
廠商： ALLIANCE SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： UP Power Supply Supervisor With Battery Backup Switch
中文描述： 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 2/13頁(yè)
文件大?。?/td> 323K
代理商： ASM805LEPA
7
2 of 13
Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
μP Power Supply Supervisor With Battery Backup Switch
rev 1.0
Pin Configuration
October 2003
1
2
3
4
5
6
7
8
V
OUT
V
CC
GND
PFI
V
BATT
RESET (RESET)
WDI
PFO
Plastic/CerDip/SO
ASM690A
ASM692A
ASM802L
ASM802M
(ASM805L)
Pin Description
Pin Number
Name
Function
ASM690A /
ASM692A
ASM802L /
ASM802M
ASM805L
1
1
V
OUT
Voltage supply for RAM. When V
CC
is above the reset threshold, V
OUT
connects to
V
CC
through a P-Channel MOS device. If V
CC
falls below the reset threshold, this
output will be connected to the backup supply at V
BATT
(or V
CC
, whichever is
higher) through the MOS switch to provide continuous power to the CMOS RAM.
2
2
V
CC
+5V power supply input.
3
3
GND
Ground
4
4
PFI
Power failure monitor input. PFI is connected to the internal power fail comparator
which is referenced to 1.25V. The power fail output (PFO) is active LOW but
remains HIGH if PFI is above 1.25V. If this feature is unused, the PFI pin should be
connected to GND or V
OUT
.
5
5
PFO
Power-fail output. PFO is active LOW whenever the PFI pin is less than 1.25V.
6
6
WDI
Watchdog input. The WDI input monitors microprocessor activity. An internal timer
is reset with each transition of the WDI input. If the WDI is held HIGH or LOW for
longer than the watchdog timeout period, typically 1.6 seconds, RESET (or RESET)
is asserted for the reset pulse width time, t
RS
, of 140ms, minimum.
7
-
RESET
Active-LOW reset output. When triggered by V
CC
falling below the reset threshold
or by watchdog timer timeout, RESET (or RESET) pulses low for the reset pulse
width t
RS
, typically 200ms. It will remain low if V
CC
is below the reset threshold
(4.65V in ASM690A / ASM802L and 4.4V in the ASM692A / ASM802L) and
remains low for 200ms after V
CC
rises above the reset threshold.
-
RESET
Active-HIGH reset output. The inverse of RESET.
8
8
V
BATT
Auxiliary power or backup-battery input. V
BATT
should be connected to GND if the
function is not used. The input has about 40mV of hysteresis to prevent rapid tog-
gling between V
CC
and V
BATT
.
相關(guān)PDF資料
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