X40020, 40021
®
Data Sheet
March 28, 2005
FN8112.0
APPLICATIONS
Dual Voltage Monitor with Integrated CPU
Supervisor and System Battery Switch
• Communications Equipment
—Routers, Hubs, Switches
—Disk arrays
• Industrial Systems
—Process Control
—Intelligent Instrumentation
• Computer Systems
—Desktop Computers
—Network Servers
FEATURES
• Dual voltage detection and reset assertion
—Three standard reset threshold settings
(4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V)
—V
Programmable down to 0.9V
TRIP2
—Adjust low voltage reset threshold voltages
using special programming sequence
—Reset signal valid to V = 1V
—Monitor two voltages or detect power fail
• Battery Switch Backup
CC
X40020/21
Standard VTRIP1 Level Standard VTRIP2, Level Suffix
• V
: 5mA to 50mA from V ; 250µA from V
OUT
CC BATT
4.6V (+/-1%)
4.6V (+/-1%)
2.9V(+/-1.7%)
2.9V(+/-1.7%)
2.6V (+/-2%)
1.6V (+/-3%)
-A
-B
-C
• Fault detection register
• Selectable power-on reset timeout
(0.05s, 0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval
(25ms, 200ms, 1.4s, off)
See “Ordering Information” for more details
For Custom Settings, call Intersil.
• Debounced manual reset input
• Low power CMOS
DESCRIPTION
—25µA typical standby current, watchdog on
—6µA typical standby current, watchdog off
—1µA battery current in backup mode
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available packages
The X40020 combines power-on reset control, watch-
dog timer, supply voltage supervision, and secondary
supervision, and manual reset, in one package. This
combination lowers system cost, reduces board space
requirements, and increases reliability.
—14-lead SOIC, TSSOP
• Monitor Voltages: 5V to 1.6V
• Memory Security
Applying voltage to V
activates the power-on reset
CC
circuit which holds RESET/RESET active for a period of
time. This allows the power supply and system oscilla-
tor to stabilize before the processor can execute code.
• Battery Switch Backup
• V
5mA to 50mA
OUT
BLOCK DIAGRAM
V
OUT
+
-
V2FAIL
WDO
V2MON
V
TRIP2
V2 Monitor
Logic
Watchdog
and
Reset Logic
Fault Detection
Register
Data
Register
SDA
WP
V
OUT
Status
Register
Command
Decode Test
& Control
Logic
MR
RESET
X40020
SCL
Power-on,
Manual Reset
Low Voltage
Reset
V
OUT
RESET
X40021
+
-
V
CC
V
TRIP1
Generation
(V1MON)
V
Monitor
CC
Logic
BATT-ON
LOWLINE
System
Battery
Switch
V
OUT
V
BATT
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2005. All Rights Reserved
1
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