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X4003S8 参数 Datasheet PDF下载

X4003S8图片预览
型号: X4003S8
PDF下载: 下载PDF文件 查看货源
内容描述: CPU监控器 [CPU Supervisor]
分类和应用: 监控
文件页数/大小: 18 页 / 276 K
品牌: INTERSIL [ INTERSIL CORPORATION ]
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®
X4003, X4005
Data Sheet
May 11, 2006
FN8113.1
CPU Supervisor
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 plus anneal available (RoHS compliant)
DESCRIPTION
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 oscilla-
tor 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 select-
able 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 stan-
dard 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 thresh-
old for applications requiring higher precision.
BLOCK DIAGRAM
Watchdog Transition
Detector
WP
SDA
Data
Register
Command
Decode &
Control
Logic
V
CC
Threshold
Reset logic
V
CC
V
TRIP
+
-
Watchdog
Timer Reset
RESET (X4003)
Control
Register
Reset &
Watchdog
Timebase
RESET (X4005)
SCL
Power-on and
Low Voltage
Reset
Generation
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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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.