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LTC1235CSW-PBF

更新时间： 2024-11-23 05:43:39
品牌 Logo 应用领域
凌特 - Linear 微处理器监控
页数 文件大小 规格书
16页 224K
描述
Microprocessor Supervisory Circuit

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LTC1235CSW-PBF 数据手册

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LTC1235  
Microprocessor  
Supervisory Circuit  
FEATURES  
DESCRIPTION  
TheLTC®1235providescompletepowersupplymonitoring  
and battery control functions for microprocessor reset,  
batterybackup,RAMwriteprotection,powerfailurewarn-  
ingandwatchdogtiming. TheLTC1235hasalltheLTC695  
featuresplusconditionalbatterybackupandexternalreset  
control.Whenanout-of-tolerancepowersupplycondition  
occurs, the reset outputs are forced to active states and  
the Chip Enable output write-protects external memory.  
The RESET output is guaranteed to remain logic low with  
n
Guaranteed Reset Assertion at V = 1V  
CC  
n
n
1.5mA Maximum Supply Current  
Fast (35ns Max.) Onboard Gating of RAM Chip  
Enable Signals  
n
n
n
n
n
n
n
Conditional Battery Backup Extends Battery Life  
4.65V Precision Voltage Monitor  
Power OK/Reset Time Delay: 200ms  
External Reset Control  
Minimum External Component Count  
1μA Maximum Standby Current  
Voltage Monitor for Power Fail or Low Battery  
Warning  
V
as low as 1V. External reset control is provided by a  
CC  
debounced pushbutton reset input.  
TheLTC1235powerstheactiveCMOSRAMswithacharge  
pumped NMOS power switch to achieve low dropout and  
low supply current. When primary power is lost, auxiliary  
power,connectedtothebatteryinputpin,providesbackup  
power to the RAMs. The LTC1235 can be programmed by  
a P signal to either back up the RAMs or not. This extends  
the battery life in situations where RAM data need not  
always be saved when power goes down.  
n
n
n
Thermal Limiting  
Performance Specified Over Temperature  
All the LTC695 Features Plus Conditional Battery  
Backup and External Reset Control  
APPLICATIONS  
n
Critical μP Power Monitoring  
n
Intelligent Instruments  
For an early warning of impending power failure, the  
LTC1235 provides an internal comparator with a user-  
defined threshold. An internal watchdog timer is also  
available,whichforcestheresetpinstoactivestateswhen  
the watchdog input is not toggled prior to the time-out  
period.  
n
Battery-Powered Computers and Controllers  
Automotive Systems  
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners.  
Battery Life vs  
Backup Duty Cycle  
TYPICAL APPLICATION  
10  
9
LT1086-5  
V
IN  
≥ 7.5V  
+5V  
+
POWER TO  
μP  
V
V
OUT  
V
V
V
LTC1235  
IN  
CC  
OUT  
+
CMOS RAM POWER  
8
7
6
5
4
3
2
0.1μF  
+3V  
0.1μF  
100μF  
10μF  
51k  
ADJ  
LTC1235  
I/O LINE  
BACKUP  
BATT  
RESET  
μP RESET  
LTC695  
μP  
SYSTEM  
μP NMI  
(WITHOUT  
CONDITIONAL  
BATTERY  
BACKUP)  
PFO  
PFI  
PB RST  
I/O LINE  
WDI  
10k  
1235 TA1  
1
0
THE LTC1235 EXTENDS BATTERY LIFE BY PROVIDING BATTERY POWER ONLY WHEN REQUIRED TO BACK UP RAM DATA.  
IT SAVES THE BATTERY WHEN NO DATA BACKUP IS NEEDED. THE μP REQUESTS BACKUP WITH THE BACKUP PIN.  
0
20  
40  
60  
80  
100  
BACKUP DUTY CYCLE (%)  
1235 TA02  
1235fa  
1
1234567...16

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