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LTC1235 Datasheet

  • LTC1235

  • Microprocessor Supervisory Circuit

  • 295.95KB

  • 16頁

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LTC1235
Microprocessor
Supervisory Circuit
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Guaranteed
Reset Assertion at V
CC
= 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
1碌A(chǔ) Maximum Standby Current
Voltage Monitor for Power Fail or Low Battery
Warning
Thermal Limiting
Performance Specified Over Temperature
All the LTC695 Features Plus Conditional Battery
Backup and External Reset Control
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 V
CC
as
low as 1V. External reset control is provided by a debounced
push-button reset input.
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
碌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.
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.
APPLICATI
s
s
s
s
S
Critical
碌P
Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems
TYPICAL APPLICATI
V
IN
鈮?/div>
7.5V
LT1086-5
BATTERY LIFE (NORMALIZED)
+
10碌F
V
IN
ADJ
V
OUT
+5V
+
100碌F
V
CC
0.1碌F
V
OUT
LTC1235
0.1碌F
POWER TO
碌P
CMOS RAM POWER
I/O LINE
碌P RESET
碌P NMI
I/O LINE
碌P
SYSTEM
V
BATT
51k
+3V
PFI
PB RST
10k
BACKUP
RESET
PFO
WDI
LTC1235 TA1
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
碌P
REQUESTS BACKUP WITH THE BACKUP PIN.
U
Battery Life vs
Backup Duty Cycle
10
9
8
7
6
5
4
3
2
1
0
0
20
60
80
40
BACKUP DUTY CYCLE (%)
100
LTC695
(WITHOUT
CONDITIONAL
BATTERY
BACKUP)
LTC1235
LTC1235 TA02
UO
UO
1

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