X55060 Datasheet, PDF (2/23 Pages) Intersil Corporation – Dual Voltage Monitor with Integrated System Battery Switch and EEPROM

X55060
A system battery switch circuit compares V_CC (V1MON)
with V_BATT input and connects V_OUT to whichever is
higher. This provides voltage to external SRAM or other
circuits in the event of main power failure. The X55060
can drive 50mA from V_CC and 250µA from V_BATT. The
device switches to V_BATT when V_CC drops below the
low V_CC voltage threshold and V_BATT > V_CC.
The Watchdog Timer provides an independent protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable
time out interval, the device activates the WDO signal.
The user selects the interval from three preset values.
Once selected, the interval does not change, even
after cycling the power.
The device’s low V_CC detection circuitry protects the
user’s system from low voltage conditions, resetting the
system when V_CC (V1MON) falls below the minimum
V_CC trip point (V_TRIP1). RESET/RESET is asserted until
V_CC returns to proper operating level and stabilizes. A
second voltage monitor circuit tracks the unregulated
supply or monitors a second power supply voltage to
provide a power fail warning. Intersil’s unique circuits
allow the threshold for either voltage monitor to be
reprogrammed to meet special needs or to fine-tune the
threshold for applications requiring higher precision.
ORDERING INFORMATION
X55060
Suffix
V20-4.5A
V20I-4.5A
V20-4.5
V20I-4.5
V20-2.7A
V20I-2.7A
V20-2.7
V20I-2.7
Vtrip1
4.6
4.6
2.9
2.6
Vtrip2
2.6
2.9
1.65
1.65
Temp Range
0°C to 70°C
-40°C to 85°C
0°C to 70°C
-40°C to 85°C
0°C to 70°C
-40°C to 85°C
0°C to 70°C
-40°C to 85°C
PIN CONFIGURATION
20-Pin TSSOP
CS/WDI
1
NC
2
SO
3
RESET
4
LOWLINE
5
V2FAIL
6
V2MON
7
WP
8
NC
9
VSS
10
20
V_CC (V1MON)
19
WDO
18
RESET/MR
17
BATT-ON
16
V_OUT
15
V_BATT
14
SCK
13
NC
12
NC
11
SI
2
FN8133.0
March 28, 2005