x45620 Intersil Corporation, x45620 Datasheet - Page 2

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

DESCRIPTION (Continued)
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
user’s system from low voltage conditions, resetting
the system when V
mum V
V
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 preci-
sion. (Contact factory for custom V
Ordering Information
PIN DESCRIPTION
CC
V
Pin
4.75–5.5V
CC
2.7–5.5V
1
2
3
4
5
6
7
returns to proper operating level and stabilizes. A
Range
CC
LOWLINE
V2MON
V2FAIL
trip point (V
Name
NC
NC
S
S
0
1
V
TRIP1
4.5–4.75V
2.55–2.7V
CC
CC
Device Select Input.
Device Select Input.
No internal connections
Low V
goes HIGH when V
No internal connections
V2 Voltage Fail Output. This open drain output goes LOW when V2MON is less than V
goes HIGH when V2MON exceeds V
V2 Voltage Monitor Input. When the V2MON input is less than the V
LOW. This input can monitor an unregulated power supply with an external resistor divider or can
monitor a second power supply with no external components. Connect V2MON to V
when not used.
TRIP1
(V1MON) falls below the mini-
detection circuitry protects the
Range
2
). RESET is asserted until
CC
Detect. This open drain output signal goes LOW when V
TRIP
V
TRIP2
2.55–2.7V
1.7–1.80V
options)
CC
This pin has an internal pull down resistor. (>10MΩ typical)
This pin has an internal pull down resistor. (>10MΩ typical)
Range
> V
TRIP1
.
20L TSSOP
20L TSSOP
X45620
Package
TRIP2
. There is no power-up reset delay circuitry on this pin.
PIN CONFIGURATION
Function
RESET/MR
LOWLINE
V2MON
Temperature Range
V2FAIL
WDO
V
NC
NC
S0
S1
SS
-40°C–85°C
-40°C–85°C
Operating
0°C–70°C
0°C–70°C
1
2
3
4
5
6
7
8
9
10
20-Pin TSSOP
CC
TRIP2
< V
TRIP1
voltage, V2FAIL goes
20
19
18
17
16
15
14
13
12
11
X45620V20I-2.7
X45620V20-2.7
and immediately
Part Number
X45620V20I
X45620V20
SS
V
WP
NC
BATT-ON
V
V
SCL
NC
NC
SDA
CC
OUT
BATT
TRIP2
or V
(V1MON)
CC
July 29, 2005
and
FN8250.0