參數(shù)資料
型號: LTC695CN-3.3#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 電源管理
英文描述: 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16
封裝: 0.300 INCH, LEAD FREE, PLASTIC, DIP-16
文件頁數(shù): 7/20頁
文件大小: 189K
代理商: LTC695CN-3.3#TRPBF
LTC694-3.3/LTC695-3.3
15
69453fb
TYPICAL APPLICATION
Capacitor Back-Up with 74HC4016 Switch
TYPICAL APPLICATION
R1
10k
R2
30k
0.1μF
14
12
11
10
1
7
100μF
13
2
3.3V
VCC
VOUT
VBATT
74HC4016
694/5-3.3 TA03
LOW LINE
GND
LTC695-3.3
+
Table 2. LTC695-3.3 Reset Active Time and Watchdog Timeout Selections
OSC SEL
OSC IN
WATCHDOG TIMEOUT PERIOD
RESET ACTIVE TIME
NORMAL (SHORT PERIOD)
IMMEDIATELY AFTER
RESET (LONG PERIOD)
LTC695-3.3
Low
External Clock Input
1024 CLKs
4096 CLKs
2048 CLKs
Low
External Capacitor*
400ms
70pF
C
1.6s
70pF
C
800ms
70pF
C
Floating or High
Low
100ms
1.6 sec
200ms
Floating or High
1.6 sec
200ms
*The nominal internal frequency is 10.24kHz. The nominal oscillator frequency with external capacitor is fOSC (Hz) =
184,000
C(pF) 1025
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 timeout periods. In both cases, the timeout period
immediately after a reset is at least 1 second.
Push-Button Reset
The LTC694-3.3/LTC695-3.3 do not provide a logic input
for direct connection to a push-button. However, a push-
button in series with a 100Ω resistor connected to the
RESET output pin (Figure 13) provides an alternative for
manual reset. Connecting a 0.1μF capacitor to the RESET
pin debounces the push-button input.
The 100Ω resistor in series with the push-button is re-
quired to prevent the ringing, due to the capacitance and
lead inductance, from pulling the RESET pins of the MPU
and LTC69X below ground.
3.3V
100Ω
VCC
LTC694-3.3
LTC695-3.3
GND
694/5-3.3 F13
RESET
0.1μF
MPU
(e.g. 68HC05)
RESET
Figure 13. The External Push-Button Reset
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