1
FN8113.2
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, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
X4003, X4005
CPU Supervisor
These devices combine three popular functions; Power-on
Reset Control, Watchdog Timer and Supply Voltage
Supervision. This combination lowers system cost, reduces
board space requirements and increases reliability.
Applying power to the device activates the power-on reset
circuit which holds RESET
/RESET active for a period of
time. This allows the power supply and oscillator to stabilize
before the processor can execute code.
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. When the microcontroller
fails to restart a timer within a selectable time out interval,
the device activates the RESET
/RESET 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
CC
detection circuitry protects the user’s
system from low voltage conditions, resetting the system
when V
CC
falls below the minimum V
CC
trip point.
RESET
/RESET is asserted until V
CC
returns to proper
operating level and stabilizes. Five industry standard V
TRIP
thresholds are available; however, Intersil’s unique circuits
allow the threshold to be reprogrammed to meet custom
requirements, or to fine-tune the threshold for applications
requiring higher precision.
Features
• Selectable watchdog timer
- Select 200ms, 600ms, 1.4s, off
•Low V
CC
detection and reset assertion
- Five standard reset threshold voltages nominal 4.62V,
4.38V, 2.92V, 2.68V, 1.75V
-Adjust low V
CC
reset threshold voltage using special
programming sequence
- Reset signal valid to V
CC
= 1V
• Low power CMOS
- 12µA typical standby current, watchdog on
- 800nA typical standby current watchdog off
- 3mA active current
• 400kHz I
2
C interface
• 1.8V to 5.5V power supply operation
• Available packages
- 8 Ld SOIC
- 8 Ld MSOP
• Pb-free available (RoHS compliant)
Pinout
X4003, X4005
(8 LD SOIC, MSOP)
TOP VIEW
Block Diagram
NC
V
SS
V
CC
SDA
SCL
3
2
4
1
6
7
5
8
NC
WP
RESET
/RESET*
*RESET
APPLIES TO X4003
RESET APPLIES TO X4005
DATA
REGISTER
COMMAND
DECODE AND
CONTROL
LOGIC
SDA
SCL
V
CC
RESET AND
WATCHDOG
TIMEBASE
POWER-ON AND
GENERATION
+
-
RESET (X4003)
RESET
LOW VOLTAGE
CONTROL
REGISTER
WATCHDOG TRANSITION
DETECTOR
WP
V
CC
THRESHOLD
RESET LOGIC
RESET (X4005)
V
TRIP
WATCHDOG
TIMER RESET
Data Sheet June 30, 2008
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