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LTC1235

更新时间： 2024-11-22 22:55:51
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 295K
描述
Microprocessor Supervisory Circuit

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中文翻译

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LTC1235 数据手册

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LTC1235  
Microprocessor  
Supervisory Circuit  
U
DESCRIPTIO  
EATURE  
S
F
■
■
■
The LTC1235 provides complete power supply monitoring  
and battery control functions for microprocessor reset,  
battery backup, RAM write protection, power failure warn-  
ing and watchdog timing. The LTC1235 has all the LTC695  
features plus conditional battery backup and external reset  
control. When an out-of-tolerance power supply condition  
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 VCC as  
lowas1V.Externalresetcontrolisprovidedbyadebounced  
push-button reset input.  
Guaranteed Reset Assertion at VCC = 1V  
1.5mA Maximum Supply Current  
Fast (35ns Max.) Onboard Gating of RAM Chip  
Enable Signals  
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  
■
■
■
■
■
■
■
The LTC1235 powers the active CMOS RAMs with a charge  
pumped NMOS power switch to achieve low dropout and  
low supply current. When primary power is lost, auxiliary  
power, connected to the battery input pin, provides backup  
power to the RAMs. The LTC1235 can be programmed by  
a µP 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.  
■
■
■
Thermal Limiting  
Performance Specified Over Temperature  
All the LTC695 Features Plus Conditional Battery  
Backup and External Reset Control  
O U  
PPLICATI  
A
S
■
■
■
■
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 avail-  
able, which forces the reset pins to active states when the  
watchdog input is not toggled prior to the time-out period.  
Critical µP Power Monitoring  
Intelligent Instruments  
Battery-Powered Computers and Controllers  
Automotive Systems  
U
O
TYPICAL APPLICATI  
Battery Life vs  
Backup Duty Cycle  
10  
LT1086-5  
V
≥ 7.5V  
9
IN  
+5V  
+
LTC1235  
POWER TO  
µP  
V
V
OUT  
V
V
V
IN  
CC  
OUT  
8
7
6
5
4
3
2
+
CMOS RAM POWER  
0.1µF  
0.1µF  
100µF  
10µF  
51k  
ADJ  
LTC1235  
I/O LINE  
BACKUP  
RESET  
BATT  
+3V  
LTC695  
µP RESET  
(WITHOUT  
CONDITIONAL  
BATTERY  
BACKUP)  
µP  
SYSTEM  
µP NMI  
PFO  
WDI  
PFI  
PB RST  
I/O LINE  
10k  
1
0
LTC1235 TA1  
0
20  
40  
60  
80  
100  
BACKUP DUTY CYCLE (%)  
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.  
LTC1235 TA02  
1
1234567...16

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