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參數(shù)資料
| 型號(hào)： | MAX6822SUK+ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO5 |
| 封裝： | LEAD FREE, SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 7/9頁(yè) |
| 文件大?。?/td> | 355K |
| 代理商： | MAX6822SUK+ |
Resets are issued to the P during power-up, power-
down, and brownout conditions. The Typical Operating
Characteristics show a graph of the MAX6821–
MAX6825’s Maximum VCC Transient Duration vs. Reset
Threshold Overdrive, for which reset pulses are not
generated. The graph was produced using negative-
going VCC pulses, starting at the standard monitored
voltage and ending below the reset threshold by the
magnitude indicated (reset threshold overdrive). The
graph shows the maximum pulse width that a negative-
going VCC transient can typically have without trigger-
ing a reset pulse. As the amplitude of the transient
increases (i.e., goes farther below the reset threshold),
the maximum allowable pulse width decreases.
Typically, a VCC transient that goes 100mV below the
reset threshold and lasts for 20s or less will not trigger
a reset pulse.
Watchdog Software Considerations
One way to help the watchdog timer monitor software
execution more closely is to set and reset the watch-
dog input at different points in the program, rather than
pulsing the watchdog input high-low-high or low-high-
low. This technique avoids a stuck loop, in which the
watchdog timer would continue to be reset inside the
loop, keeping the watchdog from timing out.
Figure 5 shows an example of a flow diagram where
the I/O driving the watchdog input is set high at the
beginning of the program, set low at the beginning of
every subroutine or loop, then set high again when the
program returns to the beginning. If the program
should hang in any subroutine, the problem would
quickly be corrected, since the I/O is continually set
low and the watchdog timer is allowed to time out,
causing a reset or interrupt to be issued. As described
in the Watchdog Input Current section, this scheme
results in higher time average WDI input current than
does leaving WDI low for the majority of the timeout
period and periodically pulsing it low-high-low.
MAX6821–MAX6825
Low-Voltage SOT23 P Supervisors with
Manual Reset and Watchdog Timer
_______________________________________________________________________________________
7
Figure 3. Watchdog Timing Relationship
Figure 4. Interfacing Open-Drain RESET to Ps with
Bidirectional Reset I/O
VCC
tWD
tRP
tRST
WDI
RESET*
*RESET IS THE INVERSE OF RESET.
MAX6822
RESET
GENERATOR
GND
VCC
RESET
P
Figure 5. Watchdog Flow Diagram
START
SET WDI
HIGH
PROGRAM
CODE
SUBROUTINE OR
PROGRAM LOOP
SET WDI LOW
RETURN
MAX6823
P
VCC
GND
MANUAL
RESET
I/O
RESET
MR
WDI
Typical Operating Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6822SUK+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.93V 10UA 5PIN SOT-23 - Rail/Tube |
| MAX6822SUK+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(guò)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(kāi)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 |
| MAX6822SUK-T | 功能描述:監(jiān)控電路 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(guò)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(kāi)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 |
| MAX6822TUK | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE SOT23 MICROPROCESSOR SU - Cut Tape Product |
| MAX6822TUK+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 3.08V 10UA 5-PIN SOT-23 - Rail/Tube |
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