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參數(shù)資料
| 型號(hào)： | MAX6825YUK-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Low-Voltage SOT23 レP Supervisors with Manual Reset and Watchdog Timer |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 7/9頁(yè) |
| 文件大?。?/td> | 167K |
| 代理商： | MAX6825YUK-T |
Resets are issued to the μP during power-up, power-
down, and brownout conditions. The
Typical Operating
Characteristics
show a graph of the MAX6821
–
MAX6825
’
s Maximum V
CC
Transient Duration vs. Reset
Threshold Overdrive, for which reset pulses are not
generated. The graph was produced using negative-
going V
CC
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 V
CC
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 V
CC
transient that goes 100mV below the
reset threshold and lasts for 20μs 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.
M
Low-Voltage SOT23 μP Supervisors with
Manual Reset and Watchdog Timer
_______________________________________________________________________________________
7
Figure 3. Watchdog Timing Relationship
Figure 4. Interfacing Open-Drain
RESET
to μPs with
Bidirectional Reset I/O
V
CC
t
WD
t
RP
t
RP
t
RST
WDI
RESET*
*RESET IS THE INVERSE OF RESET.
MAX6822
RESET
GENERATOR
GND
GND
V
CC
V
CC
RESET
RESET
μ
P
Figure 5. Watchdog Flow Diagram
START
SET WDI
HIGH
PROGRAM
CODE
SUBROUTINE OR
PROGRAM LOOP
SET WDI LOW
RETURN
MAX6823
μ
P
V
CC
V
CC
V
CC
GND
MANUAL
RESET
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) |
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|---|---|
| MAX6825ZUK | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE SOT23 UP SUPERVISOR WIT - Cut Tape Product |
| MAX6825ZUK+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(lèi)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 |
| MAX6825ZUK-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(lèi)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 |
| MAX6826LUT | 制造商:Maxim Integrated Products 功能描述:DUAL ULTRA_LOW_VOLTAGE SOT23 MICROPROCESSOR S - Rail/Tube |
| MAX6826LUT+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.63V/ADJV 10UA 6PIN SOT-23 - Rail/Tube |
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