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參數(shù)資料
| 型號(hào)： | LTC694 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Microprocessor Supervisory Circuits |
| 中文描述： | 微處理器監(jiān)控電路 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大小： | 141K |
| 代理商： | LTC694 |
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14
LTC 690/LTC 691
LTC 694/LTC 695
Low
External Clock Input
1024 clks
400ms
C
70pF
4096 clks
1.6 sec
C
70pF
512 clks
200ms
C
70pF
2048 clks
800ms
C
70pF
Low
External Capacitor*
Floating or High
Floating or High
Low
100ms
1.6 sec
1.6 sec
1.6 sec
50ms
50ms
200ms
200ms
Floating or High
U
S
A
O
PPLICATI
U
U
IMMEDIATELY
AFTER RESET
(Long Period)
NORMAL
(Short Period)
WATCHDOG TIME-OUT PERIOD
RESET ACTIVE TIME
LTC691
LTC695
OSC IN
OSC SEL
Table 2. LTC691 and LTC695 Reset Active Time and Watchdog Time-Out Selections
Figure 13. The External Push-Button Reset
Figure 14. The External Push-Button Reset with the LTC1235
Push-Button Reset
The LTC690 family does not provide a logic input for direct
connection to a pushbutton. However, a push-button in
series with a 100
resistor connected to the RESET output
pin (Figure 13) provides an alternative for manual reset.
Connecting a 0.1
μ
F capacitor to the RESET pin debounces
the push-button input.
The 100
resistor in series with the push-button is
required to prevent the ringing, due to the capacitance and
lead inductance, from pulling the RESET pins of the MPU
and LTC69X below ground.
If a dedicated pushbutton reset input is desired, the
LTC1235 is a good choice (Figure 14). It has all the
functions of the LTC695 and provides push-button reset
as an extra feature. Its push-button is internally debounced
and invokes the normal 200ms reset sequence. This
eliminates the need for the 100
resistor and 0.1
μ
F
capacitor. It also provides a more consistent reset pulse.
5V
100
V
CC
LTC690/LTC691
LTC694/LTC695
GND
690 F13
RESET
0.1
μ
F
MPU
(e.g. 6805)
RESET
5V
V
CC
LTC1235
GND
690 F14
RESET
MPU
(e.g. 6805)
RESET
PBRST
*The nominal internal frequency is 10.24kHz. The nominal oscillator frequency with external capacitor is f
OSC
(Hz) =
184,000
C(pF) 1025
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC690IN8 | Microprocessor Supervisory Circuits |
| LTC694C-3.3 | 3.3V Microprocessor Supervisory Circuits |
| LTC690CN8 | Microprocessor Supervisory Circuits |
| LTC690CS8 | Microprocessor Supervisory Circuits |
| LTC690I | Microprocessor Supervisory Circuits |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6943 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower, Dual Precision Instrumentation Switched Capacitor Building Block |
| LTC694-3.3 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Voltage Supervisorwith 27 Selectable Thresholds and Watchdog Timer |
| LTC6943CGN | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower, Dual Precision Instrumentation Switched Capacitor Building Block |
| LTC6943CGN#PBF | 功能描述:IC BUILDNG BLK SWCAP DUAL 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC6943CGN#TRPBF | 功能描述:IC BUILDNG BLK SWCAP DUAL 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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