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X5165

更新时间： 2024-11-06 22:41:23
品牌 Logo 应用领域
XICOR 监控可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数 文件大小 规格书
21页 119K
描述
CPU Supervisor with 16Kbit SPI EEPROM

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中文翻译

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X5165 数据手册

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Preliminary Information  
Replaces X25163/X25165  
X5163/X5165  
CPU Supervisor with 16Kbit SPI EEPROM  
FEATURES  
• Selectable watchdog timer  
• Low V detection and reset assertion  
DESCRIPTION  
These devices combine four popular functions, Power-  
on Reset Control, Watchdog Timer, Supply Voltage  
Supervision, and Block Lock Protect Serial EEPROM  
Memory in one package. This combination lowers  
system cost, reduces board space requirements, and  
increases reliability.  
CC  
—Five standard reset threshold voltages  
—Re-program low V reset threshold voltage  
CC  
using special programming sequence  
—Reset signal valid to V = 1V  
CC  
• Determine watchdog or low voltage reset with a  
volatile flag bit  
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.  
• Long battery life with low power consumption  
—<50µA max standby current, watchdog on  
—<1µA max standby current, watchdog off  
—<400µA max active current during read  
• 16Kbits of EEPROM  
• Built-in inadvertent write protection  
—Power-up/power-down protection circuitry  
—Protect 0, 1/4, 1/2 or all of EEPROM array with  
Block Lock™ protection  
—In circuit programmable ROM mode  
• 2MHz SPI interface modes (0,0 & 1,1)  
• Minimize EEPROM programming time  
—32-byte page write mode  
The Watchdog Timer provides an independent protection  
mechanism for microcontrollers. When the microcon-  
troller 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  
detection circuitry protects the  
CC  
user’s system from low voltage conditions, resetting the  
system when V falls below the minimum V trip point.  
CC  
CC  
—Self-timed write cycle  
RESET/RESET is asserted until V  
returns to proper  
CC  
—5ms write cycle time (typical)  
• 2.7V to 5.5V and 4.5V to 5.5V power supply  
operation  
• Available packages  
—14-lead TSSOP, 8-lead SOIC  
operating level and stabilizes. Five industry standard  
thresholds are available, however, Xicor’s unique  
V
TRIP  
circuits allow the threshold to be reprogrammed to meet  
custom requirements or to fine-tune the threshold for  
applications requiring higher precision.  
BLOCK DIAGRAM  
Watchdog Transition  
Detector  
Watchdog  
Timer Reset  
WP  
Protect Logic  
RESET/RESET  
SI  
Data  
Register  
Status  
Register  
SO  
X5163 = RESET  
X5165 = RESET  
Command  
Decode &  
Control  
Reset &  
Watchdog  
Timebase  
SCK  
4K Bits  
4K Bits  
CS/WDI  
Logic  
V
Threshold  
CC  
8K Bits  
Reset Logic  
Power on and  
Low Voltage  
Reset  
V
+
-
CC  
Generation  
V
TRIP  
Characteristics subject to change without notice. 1 of 21  
REV 1.1 3/5/01  
www.xicor.com  
1234567...21

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