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參數(shù)資料
| 型號(hào)： | MAX6730 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 8-Channel Relay Driver with Integrated 5V LDO and Zero-Volt Detection 20-PDIP -40 to 125 |
| 中文描述： | 單/雙/三電壓微處理器監(jiān)控電路，帶有獨(dú)立的看門狗輸出 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大小： | 244K |
| 代理商： | MAX6730 |
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M
Overdrive, for which reset pulses are not generated.
The graph was produced using falling V
CC
_ pulses,
starting above V
TH
and ending below the reset thresh-
old by the magnitude indicated (reset threshold over-
drive). The graph shows the maximum pulse width that
a falling V
CC
transient typically might have without
causing a reset pulse to be issued. As the amplitude of
the transient increases (i.e., goes further below the
reset threshold), the maximum allowable pulse width
decreases. A 0.1μF bypass capacitor mounted close to
V
CC
_ provides additional transient immunity.
Watchdog Software Considerations
Setting and resetting the watchdog input at different
points in the program rather than
“
pulsing
”
the watch-
dog input high-low-high or low-high-low helps the
watchdog timer closely monitor software execution.
This technique avoids a
“
stuck
”
loop, in which the
watchdog timer continues to be reset within the loop,
preventing the watchdog from timing out. Figure 6
shows an example flow diagram in which the I/O dri-
ving the watchdog input is set high at the beginning of
the program, set low at the beginning of every subrou-
tine or loop, and then set high again when the program
returns to the beginning. If the program
“
hangs
”
in any
subroutine, the I/O continually asserts low (or high),
and the watchdog timer expires, issuing a reset or
interrupt.
Single-/Dual-/Triple-Voltage μP Supervisory
Circuits with Independent Watchdog Output
12
______________________________________________________________________________________
START
SET WDI
HIGH
PROGRAM
CODE
RETURN
SUBROUTINE
COMPLETED
HANG IN
SUBROUTINE
SUBROUTINE OR
PROGRAM LOOP
SET WDI LOW
Figure 6. Watchdog Flow Diagram
MAX6730–
MAX6735
V
REF
RESET
TIMEOUT
PERIOD
RESET
OUTPUT
DRIVER
WATCHDOG
TIMER
REF
V
CC
1
V
REF
/ 2
GND
V
CC
1
MR
V
CC
1
V
CC
1
V
CC
1
V
CC
2
MR
PULLUP
V
CC
1
V
CC
2
RSTIN
RST
WDO
WDI
Functional Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6730UTLD1-T | Variable Capacitance Diodes; Surface Mount Type: Y; Package: S-MINI; Number of Pins: 3; Application Scope: VHF/UHF TV tuner |
| MAX6730UTLD2-T | Variable Capacitance Diodes; Surface Mount Type: Y; Package: USC; Number of Pins: 2; Application Scope: CATV tuner |
| MAX6730UTLD3-T | Variable Capacitance Diodes; Surface Mount Type: Y; Package: USC; Number of Pins: 2; Application Scope: VHF/UHF VCO |
| MAX6730UTLD4-T | Variable Capacitance Diodes; Surface Mount Type: Y; Package: ESC; Number of Pins: 2; Application Scope: VHF/UHF TV tuner |
| MAX6730UTLD5-T | Variable Capacitance Diodes; Surface Mount Type: Y; Package: ESC; Number of Pins: 2; Application Scope: VHF/UHF TV tuner |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6730AUTLD1+T | 功能描述:監(jiān)控電路 Single uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6730AUTLD2+T | 功能描述:監(jiān)控電路 Single uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6730AUTLD3+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR PWR SUPPLY 4.625V 6PIN SOT-23 - Cut Tape Product |
| MAX6730AUTLD3+T | 功能描述:監(jiān)控電路 Single uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6730AUTLD4+T | 功能描述:監(jiān)控電路 Single-/Dual-/Triple-Voltage N
|
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