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參數(shù)資料
| 型號： | X55020 |
| 英文描述： | Dual Voltage Monitor with Integrated System Battery Switch and EEPROM(帶集成化系統(tǒng)電池轉(zhuǎn)換和EEPROM的雙電壓監(jiān)控器) |
| 中文描述： | 雙電壓監(jiān)控集成系統(tǒng)電池開關(guān)和EEPROM（帶集成化系統(tǒng)電池轉(zhuǎn)換和EEPROM中的雙電壓監(jiān)控器） |
| 文件頁數(shù)： | 1/2頁 |
| 文件大?。?/td> | 306K |
| 代理商： | X55020 |
REV 1.0 6/27/00
Characteristics subject to change without notice.
1 of 22
www.xicor.com
Preliminary Information
ADVANCEDINFORMATON
Dual Voltage Monitor with Integrated System Battery Switch and EEPROM
FEATURES
Dual voltage monitoring
System battery switch-over circuitry
Early warning low V
Active high and active low reset outputs
Selectable watchdog timer
—(0.15s, 0.4s, 0.8s, off)
Low V
CC
(V1MON) and V2MON detection and
reset assertion
—Four standard reset threshold voltages
—Re-program V1
TRIP
voltage using special programming sequence
—Reset signal valid to V
Long battery life with low power consumption
—<50μA max standby current, watchdog on
—<30μA max standby current, watchdog off
—<1.5mA max active current during read
4Kbits of EEPROM
Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—In circuit programmable ROM mode
10MHz SPI interface modes (0,0 & 1,1)
Minimize EEPROM programming time
—64-byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
2.7V to 5.5V power supply operation
Available packages
—20-lead TSSOP
CC
fail indicator
and V2
TRIP
reset threshold
CC
= 1V
DESCRIPTION
This device combines power-on reset control, battery
switch circuit, watchdog timer, supply voltage supervi-
sion, secondary voltage supervision, and 4Kbit serial
EEPROM in one package. 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.
A system battery switch circuit compares V
(V1MON) with V
BATT
input and connects V
whichever is higher. This provides voltage to external
SRAM or other circuits in the event of main power fail-
ure. The X55020 can drive 50mA from V
from V
BATT
. The device switches to V
drops below the low V
CC
voltage threshold and V
CC
to
OUT
CC
and 250μA
when V
BATT
CC
.
BATT
The Watchdog Timer provides an independent protec-
tion mechanism for microcontrollers. When the micro-
controller 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
user’s system from low voltage conditions, resetting the
system when V
CC
(V1MON) falls below the minimum
CC
trip point (V1
TRIP
). RESET/RESET is asserted
until V
CC
returns to proper operating level and stabi-
lizes. A second voltage monitor circuit tracks the unreg-
ulated supply or monitors a second power supply
voltage to provide a power fail warning. Xicor’s unique
circuits allow the threshold for either voltage monitor to
be reprogrammed to meet special needs or to fine-tune
the threshold for applications requiring higher precision.
CC
detection circuitry protects the
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X55060 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual Voltage Monitor with Integrated System Battery Switch and EEPROM |
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| X55060V20-4.5 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual Voltage Monitor with Integrated System Battery Switch and EEPROM |
| X55060V20-4.5A | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual Voltage Monitor with Integrated System Battery Switch and EEPROM |
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