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| 型号： | EM6324LYSP5B2.9 |
| 厂商： | EM Microelectronic |
| 英文描述： | Reset Circuit with Manual Reset and Watchdog |
| 中文描述： | 复位电路，带有手动复位和看门狗 |
| 文件页数： | 8/10页 |
| 文件大小： | 511K |
| 代理商： | EM6324LYSP5B2.9 |
EM6323/24
Functional Description
Copyright
2006, EM Microelectronic-Marin SA
03/06 - rev.H
8
www.emmicroelectronic.com
WDI
RESET
t > t
WD
t < t
WD
V
DD
t
POR
High Impedance
t
POR
MR
t
POR
Reset Outputs
A microprocessor (
μ
P) reset input starts the
μ
P in a
known state. The EM6323/24
μ
P supervisory circuits
assert a reset to prevent code-execution errors during
power-up, power-down, and brownout conditions.
RESET
is guaranteed to be a logic low for V
DD
down to 0.9V.
Once V
DD
exceeds the reset threshold, an internal timer
keeps
RESET
low for the specified reset timeout period
(t
POR
); after this interval,
RESET
returns high.
If a brownout condition occurs (V
DD
dips below the reset
threshold),
RESET
goes low. Each time
RESET
is
asserted it stays low for the reset timeout period. Any
time V
DD
goes below the reset threshold the internal
timer restarts.
RESET
is the inverse of RESET.
Fig. 14
Manual Reset Input (EM6323 only)
A logic low on
MR
asserts a reset. Reset remains
asserted while
MR
is low, and for t
POR
(200ms nominal for
EM6323 C-G-L-Q) after it returns high.
MR
has an
internal 30k
pull-up resistor, so it can be left open if
unused. This input can be driven with CMOS logic levels
or with open-drain outputs. Connect a normally open
momentary switch from
MR
to V
SS
to create a manual-
reset function; debounce circuitry is integrated. If
MR
is
driven from long cable or the device is used in a noisy
environment, connect a 0.1
μ
F capacitor from
MR
to V
SS
to provide additional noise immunity (stronger external
additional pull-up resistor can also be added).
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| EM6324LYSP5B3.1 | Reset Circuit with Manual Reset and Watchdog |
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相关代理商/技术参数 |
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|---|---|
| EM6324LYSP5B3.1 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Reset Circuit with Manual Reset and Watchdog |
| EM6324LYSP5B4.4 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Reset Circuit with Manual Reset and Watchdog |
| EM6324LYSP5B4.6 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Reset Circuit with Manual Reset and Watchdog |
| EM6324LZSP5B1.3 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Reset Circuit with Manual Reset and Watchdog |
| EM6324LZSP5B1.4 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Reset Circuit with Manual Reset and Watchdog |
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