ASM805LCPA PULSECORE [PulseCore Semiconductor], ASM805LCPA Datasheet - Page 2

• Manufacturer Part Number: ASM805LCPA
• Description: ?P Power Supply Supervisor With Battery Backup Switch
• Manufacturer: PULSECORE [PulseCore Semiconductor]

April 2008
rev 1.7
Pin Configuration
Pin Description
ASM690A/
ASM802L/
ASM802M
ASM692A
1
2
3
4
5
6
7
8
-
Pin Number
ASM805L
µP Power Supply Supervisor With Battery Backup Switch
1
2
3
4
5
6
7
8
-
Notice: The information in this document is subject to change without notice.
RESET
RESET
Name
V
GND
V
PFO
WDI
V
PFI
BATT
OUT
CC
Voltage supply for RAM. When V
connects to V
reset threshold, this output will be connected to the backup supply at V
(or V
power to the CMOS RAM.
+5V power supply input.
Ground
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
Power-fail output. PFO is active LOW whenever the PFI pin is less than
1.25V.
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
140ms, minimum.
Active-LOW reset output. When triggered by V
threshold or by watchdog timer timeout, RESET pulses low for the reset
pulse width t
threshold (4.65V in ASM690A / ASM802L and 4.4V in the ASM692A /
ASM802L) and remains low for 200ms after V
threshold.
Active-HIGH reset output. The inverse of RESET.
Auxiliary power or backup-battery input. V
if the function is not used. The input has about 40mV of hysteresis to
prevent rapid toggling between V
CC
, whichever is higher) through the MOS switch to provide continuous
RS
CC
, typically 200ms. It will remain low if V
through a P-Channel MOS device. If V
CC
Function
CC
and V
is above the reset threshold, V
BATT
BATT
.
should be connected to GND
ASM690A/692A
ASM802L/802M
CC
CC
falling below the reset
rises above the reset
OUT
CC
.
CC
is below the reset
ASM805L
falls below the
2 of 15
RS
BATT
OUT
, of