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參數(shù)資料
| 型號： | X4003M8I-2.7A |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | RTC Module With CPU Supervisor |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | 3 MM, PLASTIC, MO-187AA, MSOP-8 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大小： | 378K |
| 代理商： | X4003M8I-2.7A |
REV 1.1.3 4/30/02
Characteristics subject to change without notice.
1 of 18
www.xicor.com
X4003/X4005
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
Low power CMOS
—12μA typical standby current, watchdog on
—800nA typical standby current watchdog off
—3mA active current
400kHz I
C interface
1.8V to 5.5V power supply operation
Available packages
—8-lead SOIC
—8-lead MSOP
CC
= 1V
2
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
user’s system from low voltage conditions, resetting the
system when V
CC
falls below the minimum V
point. RESET/RESET is asserted until V
proper operating level and stabilizes. Five industry stan-
dard V
TRIP
thresholds are available; however, Xicor’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.
CC
detection circuitry protects the
CC
trip
CC
returns to
BLOCK DIAGRAM
Data
Register
Command
Decode &
Control
Logic
SDA
SCL
V
CC
Reset &
Watchdog
Timebase
Power on and
Low Voltage
Generation
+
-
RESET (X4003)
RESET (X4005)
Reset
Control
Register
Watchdog Transition
Detector
WP
V
CC
Threshold
Reset logic
V
TRIP
Watchdog
Timer Reset
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