x45620 Intersil Corporation, x45620 Datasheet - Page 3

• Manufacturer Part Number: x45620
• Description: Dual Voltage Monitor With Integrated System Battery Switch And Eeprom
• Manufacturer: Intersil Corporation

PIN DESCRIPTION
12–13
Pin
10
11
14
15
16
17
18
19
20
8
9
BATT-ON
(V1MON)
RESET
Name
V
WDO
V
SDA
SCL
/MR
V
V
WP
NC
NC
BATT
OUT
CC
SS
(Continued)
Reset Output/Manual Reset Input. This is an Input/Output pin.
RESET Output. This is an active LOW, open drain output which goes active whenever V
below the minimum V
ed. RESET remains active until V
also goes active on power-up and remains active for t
MR Input. This is an active LOW debounced input. When MR is active, the RESET pins are assert-
ed. When MR is released, the RESET remains asserted for t
Watchdog Output. WDO is an active low, open drain output which goes active whenever the
watchdog timer goes active. WDO remains active for 150ms, then returns to the inactive state.
Ground
Serial Data. SDA is a bidirectional pin used to transfer data into and out of the device. It is an open
drain output, requires the use of a pull-up resistor.
Serial Clock. The SCL input is used to clock all data into and out of the device.
No internal connections
Battery Supply Voltage. This input provides a backup supply in the event of a failure of the pri-
mary V
the contents of SRAM and also powers the internal logic to “stay awake.” If unused, connect V
to ground.
Output Voltage.
V
IF V
V
V
Note: There is hysteresis around V
switchover voltage. A capacitance of 0.1µF must be connected to Vout to ensure stability.
Battery On. This CMOS output goes HIGH when the V
when V
current requirements are greater than 50mA.
The purpose of this output is to drive an external FET to get higher operating currents when the
V
V
to supply enough voltage and current to keep SRAM devices from losing their data-there is no
communication at this time.
No Connect
Write Protect. The WP pin works in conjunction with a nonvolatile WPEN bit to “lock” the setting
of the Watchdog Timer control and the memory write protect bits.
resistor. (>10MΩ typical)
Supply Voltage/V1 Voltage Monitor Input. When the V1MON input is less than the VTRIP1
voltage, RESET and LOWLINE go ACTIVE.
OUT
OUT
OUT
CC
OUT
CC
supply is fully functional. In the event of a V
3
pin and the external transistor is turned off. In this “backup condition,” the battery only needs
= V
= V
= V
CC
< V
OUT
CC
CC
BATT
voltage. The V
TRIP1
switches to V
if V
if V
if V
CC
, then,
CC
CC
> V
> V
CC
< V
TRIP1
BATT
sense level. When RESET is active communication to the device is interrupt-
BATT
BATT
CC
+0.03
. It is used to drive a external P-channel FET when V
.
-0.03
voltage typically provides the supply voltage necessary to maintain
CC
X45620
BATT
rises above the minimum V
± 0.03V point to avoid oscillation at or near the
Function
CC
failure, the battery voltage is applied to the
PURST
OUT
PURST
switches to V
after the power supply stabilizes.
CC
This pin has an internal pull down
sense level for t
, and then released.
BATT
and goes LOW
CC
PURST
= V
OUT
CC
. RESET
falls
and
BATT
July 29, 2005
FN8250.0