Document
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X40020, X40021
Data Sheet May 17, 2006 FN8112.1
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; 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 battery current in backup mode • 400kHz 2-wire interface www.DataSheet4U.com • 2.7V to 5.5V power supply operation • Available packages —14-lead SOIC, TSSOP • Monitor voltages: 5V to 1.6V • Memory security • Pb-free plus anneal available (RoHS compliant)
APPLICATIONS • Communications equipment —Routers, hubs, switches —Disk arrays • Industrial systems —Process control —Intelligent instrumentation • Computer systems —Desktop computers —Network servers X40020, X40021
Standard VTRIP1 Level Standard VTRIP2, Level Suffix 4.6V (±1%) 2.9V(±1.7%) -A 4.6V (±1%) 2.6V (±2%) -B 2.9V(±1.7%) 1.6V (±3%) -C
See “Ordering Information” for more details For Custom Settings, call Intersil.
DESCRIPTION The X40020 combines power-on reset control, watchdog 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. 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 oscillator to stabilize before the processor can execute code.
BLOCK DIAGRAM
V2MON
+ V2 Monitor Logic -
VOUT
VTRIP2
V2FAIL
SDA WP
Data Register Command Decode Test & Control Logic
Fault Detection Register Status Register
Watchdog and Reset Logic VOUT
WDO
MR RESET X40020 RESET X40021
SCL
VOUT VCC
(V1MON)
+ VCC Monitor Logic VTRIP1
Power-on, Manual Reset Low Voltage Reset Generation
BATT-ON VOUT VBATT
System Battery Switch
LOWLINE
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
X40020, 40021 Ordering Information
PART NUMBER* WITH RESET X40020S14-C PART MARKING X40020S C PART NUMBER* WITH RESET X40021S14-C PART MARKING X40021S C MONITORED VCC SUPPLIES 1.6 to 3.6 VTRIP1 RANGE (mV) 2.9 ±50 VTRIP2 RANGE (mV) 1.6 ±50 TEMP. RANGE (°C) 0 to 70 PACKAGE PKG. DWG. #
14 Ld.