X5001
®
Data Sheet
April 6, 2005
FN8125.0
DESCRIPTION
CPU Supervisor
This device combines three popular functions, Power-
on Reset, Watchdog Timer, and Supply Voltage
Supervision in one package. This combination lowers
system cost, reduces board space requirements, and
increases reliability.
FEATURES
• 200ms power-on reset delay
• Low V detection and reset assertion
CC
—Five standard reset threshold voltages
—Adjust low V reset threshold voltage using
CC
The watchdog timer provides an independent protec-
tion mechanism for microcontrollers. During a system
failure, the device will respond with a RESET signal
after a selectable time out interval. The user selects the
interval from three preset values. Once selected, the
interval does not change, even after cycling the power.
special programming sequence
—Reset signal valid to V = 1V
CC
• Selectable nonvolatile watchdog timer
—0.2, 0.6, 1.4 seconds
—Off selection
—Select settings through software
• Long battery life with low power consumption
—<50µA max standby current, watchdog on
—<1µA max standby current, watchdog off
• 2.7V to 5.5V operation
The user’s system is protected from low voltage condi-
tions by the device’s low V detection circuitry. When
CC
V
falls below the minimum V trip point, the system
CC
CC
is reset. RESET is asserted until V returns to proper
CC
• SPI mode 0 interface
operating levels and stabilizes. Five industry standard
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Watchdog change latch
• High reliability
V
thresholds are available, however, Intersil’s
TRIP
unique circuits allow the threshold to be reprogrammed
to meet custom requirements or to fine-tune the thresh-
old for applications requiring higher precision.
• Available packages
—8-lead TSSOP
—8-lead SOIC
—8 pin PDIP
™
The device utilizes Intersil’s proprietary Direct Write
cell for the watchdog timer control bits and the V
TRIP
storage element, providing a minimum endurance of
100,000 write cycles and a minimum data retention of
100 years.
BLOCK DIAGRAM
RESET
Watchdog
Transition
Detector
Watchdog
Timer
SI
Data
Register
Reset &
Watchdog
Timebase
SO
Command
Decode &
Control
SCK
CS/WDI
Logic
Power-on/
Low Voltage
REset
VCC
+
-
Generation
V
TRIP
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
1
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