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參數(shù)資料
| 型號： | MAX6301CPA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | +5V, Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 102K |
| 代理商： | MAX6301CPA |
M
Ensuring a V alid
RESET
/RES ET Output
Down to V
CC
= 0V (MAX 6303/MAX 6304)
When V
CC
falls below 1V,
RESET
/RESET current sink-
ing (sourcing) capabilities decline drastically. In the
case of the MAX6303, high-impedance CMOS-logic
inputs connected to
RESET
can drift to undetermined
voltages. This presents no problem in most applica-
tions, since most μPs and other circuitry do not operate
with V
CC
below 1V.
In those applications where
RESET
must be valid down
to 0V, adding a pull-down resistor between
RESET
and
ground sinks any stray leakage currents, holding
RESET
low (Figure 9). The value of the pull-down resis-
tor is not critical; 100k
is large enough not to load
RESET
and small enough to pull
RESET
to ground. For
applications using the MAX6304, a 100k
pull-up resis-
tor between RESET and V
CC
will hold RESET high when
V
CC
falls below 1V (Figure 10).
Watc hdog-S oftware Considerations
To help the watchdog timer monitor software execution
more closely, set and reset the watchdog input at differ-
ent 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 within the loop, keep-
ing the watchdog from timing out.
Figure 11 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. When using extended mode,
as described in the Watchdog Input Current section,
this scheme does result in higher average WDI input
current than does the method of leaving WDI low for the
majority of the timeout period and periodically pulsing it
low-high-low.
+5V, Low-Power μP S upervisory Circ uits
with Adjustable Reset/Watc hdog
10
______________________________________________________________________________________
MAX6303
V
CC
RESET
V
CC
GND
0.1μF
100k
Figure 9. Ensuring
RESET
Valid to V
CC
= 0V
MAX6304
V
CC
RESET
GND
V
CC
100k
0.1μF
Figure 10. Ensuring RESET Valid to V
CC
= 0V
START
SET WDI
LOW
SUBROUTINE OR
PROGRAM LOOP
SET WDI HIGH
RETURN
END
Figure 11. Watchdog Flow Diagram
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| MAX6301CSA | +5V, Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog |
| MAX6301EPA | +5V, Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog |
| MAX6301ESA | +5V, Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog |
| MAX6304ESA | +5V, Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog |
| MAX6303 | +5V, Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6301CPA+ | 功能描述:監(jiān)控電路 5V uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 |
| MAX6301CSA | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 |
| MAX6301CSA+ | 功能描述:監(jiān)控電路 5V uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 |
| MAX6301CSA+T | 功能描述:監(jiān)控電路 5V uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 |
| MAX6301CSA-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 |
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