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參數(shù)資料
| 型號： | LTC695-3.3 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 3.3V Microprocessor Supervisory Circuits |
| 中文描述： | 3.3微處理器監(jiān)控電路 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 138K |
| 代理商： | LTC695-3.3 |
13
LTC 694-3.3/LTC 695-3.3
U
S
A
O
PPLICATI
U
U
t
1
= RESET ACTIVE TIME
t
2
= NORMAL WATCHDOG TIME-OUT PERIOD
t
= WATCHDOG TIME-OUT PERIOD IMMEDIATELY
AFTER A RESET
V
CC
= 3.3V
WDI
t
2
t
3
t
1
t
1
WDO
RESET
694/5-3.3 F11
The LTC695-3.3 provides an additional output (Watchdog
Output, WDO) which goes low if the watchdog timer is
allowed to time out and remains low until set high by the
next transition on the WDI pin. WDO is also set high when
V
CC
falls below the reset voltage threshold or V
BATT
.
The LTC695-3.3 has two additonal pins, OSC SEL and OSC
IN, which allow reset active time and watchdog time-out
period to be adjusted per Table 2. Several configurations
are shown in Figure 12.
OSC IN can be driven by an external clock signal or an
external capacitor can be connected between OSC IN and
GND when OSC SEL is forced low. In these configurations,
the nominal reset active time and watchdog time-out
period are determined by the number of clocks or set by
the formula in Table 2. When OSC SEL is high or floating,
the internal oscillator is enabled and the reset active time
is fixed at 140ms minimum for the LTC695-3.3. OSC IN
selects between the 1 second and 70ms minimum normal
watchdog time-out periods. In both cases, the time-out
period immediately after a reset is at least 1 second.
Figure 12. Oscillator Configurations
Figure 11. Watchdog Time-Out Period and Reset Active Time
EXTERNAL CLOCK
INTERNAL OSCILLATOR
1.6 SECOND WATCHDOG
INTERNAL OSCILLATOR
100ms WATCHDOG
EXTERNAL OSCILLATOR
GND
GND
GND
GND
V
CC
V
CC
V
CC
OSC SEL
OSC SEL
OSC SEL
OSC SEL
OSC IN
OSC IN
OSC IN
OSC IN
3
3
3
3
4
4
4
4
8
8
8
8
7
7
7
7
V
CC
FLOATING
OR HIGH
FLOATING
OR HIGH
LTC695-3.3
FLOATING
OR HIGH
LTC695-3.3
LTC695-3.3
LTC695-3.3
694/5-3.3 F12
3.3V
3.3V
3.3V
3.3V
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| LTC695C | Microprocessor Supervisory Circuits |
| LTC695CN | Microprocessor Supervisory Circuits |
| LTC695CSW | Microprocessor Supervisory Circuits |
| LTC695I | Microprocessor Supervisory Circuits |
| LTC695ISW | Microprocessor Supervisory Circuits |
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