- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378381 > AME8520 (AME, Inc.) Micropower uP Watch Dog Timer PDF資料下載
參數(shù)資料
| 型號(hào)： | AME8520 |
| 廠商： | AME, Inc. |
| 英文描述： | Micropower uP Watch Dog Timer |
| 中文描述： | 微看門狗定時(shí)器的uP |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 183K |
| 代理商： | AME8520 |
AME, Inc.
9
AME8510 / 8520 / 8530
Micropower
μ
P Watch Dog Timer
n
Detailed Description
The AME8510/8520/8530 are designed to interface with
the reset input of a microprocessor and to prevent CPU
execution errors due to power up, power down, and other
power supply errors. The AME8510/8520 also monitor
the CPU health by checking for signal transitions from
the CPU at the WDI input.
Reset Output
Each output pin in the family can be configured to be
either push/pull or open drain. In addition each output
may be either active high or active low with the condition
that parts with two outputs must have opposite polari-
ties. Active high reset outputs are denoted as RESET.
Active low reset outputs are denoted as RESETB. The
selection guide on page 3 of this data sheet shows all
possible combinations of output driver configuration.
A reset will be asserted if any of three things happen:
1) V
DD
drops below the threshold (V
TH
)
2) The MRB pin is pulled low.
3) The WDI pin does not detect a transition
within the watch dog interval (T
WD
).
The reset will remain asserted for the prescribed reset
interval after:
1) V
DD
rises above the threshold (V
TH
)
2) MRB goes high
3) The watch dog timer has timed out causing
the reset to assert.
Manual Reset Input
The AME8510 and AME8530 feature a manual reset
feature (MRB). A logic low on the MRB pin asserts a
reset. The reset remains asserted as long as the MRB
pin remains low. After the MRB pin transitions to a high
state the reset remains asserted for the prescribed reset
interval (T
D2
). The MRB pin is internally pulled up to VDD
by a 100K
resistor. It is internally debounced to reject
switching transients.
The MRB pin is ESD protected by diodes connected
to V
and GND. So the MRB pin should never be driven
higher than V
DD
or lower than GND.
Watchdog Input
The AME8510 and AME8520 are equipped with a watch-
dog input (WDI). If the microprocessor does not produce
a valid logic edge at the the watchdog input (WDI) within
the prescribed watchdog interval (T
) then a reset as-
serts. The reset remains asserted for the required reset
interval (T
) At the end of the reset interval the reset is
deasserted and the watchdog interval timer starts again
from zero.
If the watchdog input is left unconnected or is con-
nected to a tri-stated buffer the watchdog function is dis-
abled. As soon as the WDI input is driven either low or
high the watchdog function resumes with the watchdog
timer set to zero.
Reset Timing Diagram
WDI
RESETB
VDD
V
TH
T
WD
T
D2
T
D2
Watchdog Timing Diagram
V
DD
RESETB
RESET
T
D2
V
Release
V
TH
T
D1
50%
T
D2
T
D1
50%
50%
50%
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AME8520AEEVEFE26 | Micropower UP Watch Dog Timer |
| AME8520AEEVEFE29 | Micropower UP Watch Dog Timer |
| AME8520AEEVEFE31 | Micropower UP Watch Dog Timer |
| AME8520AEEVEFE44 | Micropower UP Watch Dog Timer |
| AME8530AEEVAFX29 | Micropower UP Watch Dog Timer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AME8550CEEVB220Z | 制造商:Analog Microelectronic Inc (AME) 功能描述: |
| AME8800AEETZ | 制造商:ANALOG MICRO ELECTRONICS 功能描述: 制造商:Analog Microelectronic Inc (AME) 功能描述: |
| AME8801AEEVZ | 制造商:ANALOG MICRO ELECTRONICS 功能描述:AME8801 Series 300 mA 8 Vin 3.3 Vout CMOS LDO Positive Voltage Regulator -SOT-25 制造商:Analog Microelectronic Inc (AME) 功能描述:AME8801 Series 300 mA 8 Vin 3.3 Vout CMOS LDO Positive Voltage Regulator -SOT-25 |
| AME8801BEEVZ | 制造商:ANALOG MICRO ELECTRONICS 功能描述:AME8801 Series 300 mA 8 Vin 3 Vout CMOS LDO Positive Voltage Regulator -SOT-25 制造商:Analog Microelectronic Inc (AME) 功能描述:AME8801 Series 300 mA 8 Vin 3 Vout CMOS LDO Positive Voltage Regulator -SOT-25 |
| AME8801CEEVZ | 制造商:Analog Microelectronic Inc (AME) 功能描述:AME8801 Series 2.8 V 300 mA CMOS LDO Positive Voltage Regulator -SOT-23-5 制造商:ANALOG MICRO ELECTRONICS 功能描述:AME8801 Series 2.8 V 300 mA CMOS LDO Positive Voltage Regulator -SOT-23-5 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。