X4003, X4005
Data Sheet
June 30, 2008
FN8113.2
CPU Supervisor
Features
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.
• Selectable watchdog timer
- Select 200ms, 600ms, 1.4s, off
• Low VCC detection and reset assertion
- Five standard reset threshold voltages nominal 4.62V,
4.38V, 2.92V, 2.68V, 1.75V
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.
- Adjust low VCC reset threshold voltage using special
programming sequence
- Reset signal valid to VCC = 1V
• Low power CMOS
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.
- 12µA typical standby current, watchdog on
- 800nA typical standby current watchdog off
- 3mA active current
• 400kHz I2C interface
• 1.8V to 5.5V power supply operation
The device’s low VCC detection circuitry protects the user’s
system from low voltage conditions, resetting the system
when VCC falls below the minimum VCC trip point.
RESET/RESET is asserted until VCC returns to proper
operating level and stabilizes. Five industry standard VTRIP
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.
• Available packages
- 8 Ld SOIC
- 8 Ld MSOP
• Pb-free available (RoHS compliant)
Pinout
X4003, X4005
(8 LD SOIC, MSOP)
TOP VIEW
V
1
2
3
4
8
7
6
5
NC
NC
CC
WP
SCL
RESET/RESET*
V
SDA
SS
*RESET APPLIES TO X4003
RESET APPLIES TO X4005
Block Diagram
WATCHDOG TRANSITION
DETECTOR
WATCHDOG
TIMER RESET
WP
RESET (X4003)
RESET (X4005)
DATA
SDA
CONTROL
REGISTER
REGISTER
COMMAND
DECODE AND
CONTROL
LOGIC
RESET AND
WATCHDOG
TIMEBASE
SCL
V
THRESHOLD
CC
RESET LOGIC
POWER-ON AND
LOW VOLTAGE
V
RESET
GENERATION
+
-
CC
V
TRIP
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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