X40421 Datasheet: (X40420 / X40421) Dual Voltage Monitor





X40421 (X40420 / X40421) Dual Voltage Monitor Datasheet

Part Number X40421
Description (X40420 / X40421) Dual Voltage Monitor
Manufacture Intersil Corporation
Total Page 25 Pages
PDF Download Download X40421 Datasheet PDF

Features: ® X40420, X40421 4kbit EEPROM Data She et March 28, 2005 FN8117.0 PRELIMINARY Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switc h FEATURES • Dual voltage detection a nd reset assertion —Three standard re set threshold settings (4.6V/2.9V, 4.6V /2.6V, 2.9V/1.6V) —VTRIP2 Programmabl e down to 0.9V —Adjust low voltage re set threshold voltages using special pr ogramming sequence —Reset signal vali d to VCC = 1V —Monitor two voltages o r detect power fail • Battery Switch Backup • VOUT: 5mA to 50mA from VCC; or 250µA from VBATT • Fault detectio n register • Selectable power-on rese t timeout (0.05s, 0.2s, 0.4s, 0.8s) • Selectable watchdog timer interval (25 ms, 200ms, 1.4s, off) • Debounced man ual reset input • Low power CMOS —2 5µA typical standby current, watchdog on —6µA typical standby current, wat chdog off —1µA typical battery curre nt in backup mode www.DataSheet4U.com 4Kbits of EEPROM —16 byte page write mode —Self-timed write cycle —5ms write cycle time (typical) •.

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®
PRELIMINARY
Data Sheet
X40420, X40421
4kbit EEPROM
March 28, 2005
FN8117.0
Dual Voltage Monitor with Integrated CPU
Supervisor and System Battery Switch
FEATURES
• Dual voltage detection and reset assertion
—Three standard reset threshold settings
(4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V)
—VTRIP2 Programmable down to 0.9V
—Adjust low voltage reset threshold voltages
using special programming sequence
—Reset signal valid to VCC = 1V
—Monitor two voltages or detect power fail
• Battery Switch Backup
• VOUT: 5mA to 50mA from VCC; or 250µA from
VBATT
• 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)
• Debounced manual reset input
• Low power CMOS
—25µA typical standby current, watchdog on
—6µA typical standby current, watchdog off
—1µA typical battery current in backup mode
www.DataSheet4U.com 4Kbits of EEPROM
—16 byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Block lock protect 0 or 1/2, of EEPROM
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available packages
—14-lead SOIC, TSSOP
• •Monitor Voltages: 5V to 1.6V
• Memory Security
• Battery Switch Backup
• VOUT 5mA to 50mA
APPLICATIONS
• Communications Equipment
—Routers, Hubs, Switches
—Disk arrays
• Industrial Systems
—Process Control
—Intelligent Instrumentation
• Computer Systems
—Desktop Computers
—Network Servers
X40420/21
Standard VTRIP1 Level Standard VTRIP2 Level
4.6V (+/-1%)
2.9V(+/-1.7%)
4.6V (+/-1%)
2.6V (+/-2%)
2.9V(+/-1.7%)
1.6V (+/-3%)
See “Ordering Information” for more details
For Custom Settings, call Intersil.
Suffix
-A
-B
-C
DESCRIPTION
The X40420/21 combines power-on reset control,
watchdog timer, supply voltage supervision, and sec-
ondary supervision, manual reset, and Block Lock
protect serial EEPROM in one package. This combi-
nation lowers system cost, reduces board space
requirements, and increases reliability.
Applying voltage to VCC activates the power-on reset
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.
BLOCK DIAGRAM
V2MON
V2 Monitor
Logic
VOUT
+
VTRIP2
-
V2FAIL
SDA
WP
SCL
VCC
(V1MON)
BATT-ON
VOUT
VBATT
Data
Register
Command
Decode Test
& Control
Logic
System
Battery
Switch
Fault Detection
Register
Status
Register
EEPROM
Array
VCCLMogoicnitor
VOUT
+
VTRIP1
-
Watchdog
and
Reset Logic
VOUT
Power-on,
Manual Reset
Low Voltage
Reset
Generation
WDO
MR
RESET
X40420
RESET
X40421
LOWLINE
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

                    
                    






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