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參數(shù)資料
| 型號(hào)： | H6061258P |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 3 V Self Recovering Watchdog |
| 中文描述： | 3伏自我恢復(fù)看門狗 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 142K |
| 代理商： | H6061258P |
H6061
6
Typical Applications
Microprocessor Watchdog with Voltage Monitor
Selection of Watchdogs for Each Application
The H6061 is designed for monitoring regulated DC
voltages anywhere between 2.7 and 5.25 V. Typically, it
is used to monitor V
with pin V
tied to the midpoint of
a voltage divider (see Fig. 8). This arrangement has the
advantage of being able to trigger at selectable voltage
limits, i. e. it can be used where the regulated voltage is
below 5 VDC.
Industrial Heavy-Duty Utilisation
The H6061 debounce protects against reactions due to
fast-rise power lines, but absolute maximum ratings
must be respected. With its flexibility of voltage
programming and supply voltage the H6061 can allow
for voltage drops along supply lines, so it can be placed
remotely, like on plug-in boards (see Fig. 9). The H6061
is suitable for supply voltages down to 2.7 VDC. As the
H6061 is designed to be sensitive to voltage changes,
fast switching lines, like address/data bus lines should
not be run between the V
and V
supply lines near the
H6061 without ground-plane shielding. Tracks from
components to pin RC must be kept very short. Pin RC if
left free should be shielded with a ground ring in noisy
environments.
The H6061 has only 40 mV hysteresis specially for
monitoring regulated DC. Pin V
must be protected from
any significant mains ripple or RFI (see Fig. 10). It
should be placed as near as possible to the point where
voltage is to be monitored. Pin V
IN
is protected by an
internal resistor (nominal 15 k
) against voltages in
excess of V
. In some environments this may however
pick up enough mains ripple or RFI to distort the voltage
detection thresholds or even cause unwanted sporadic
resets in the absence of adequate shielding or filtering
on V
.
The H6061 has sufficient immunity to ripple and
interference on the V
supply line, but if it is important
that a system meet severe criteria for injected spikes and
RFI, then care must be taken also decouple V
from
these influences, as system protection must continue
even under these conditions. With normal series voltage
regulators, the regulated 5 VDC output voltage follows
the DC rough voltage within 1.5 V on powering up. If the
application has pin V
monitoring the DC rough, the
internal inputs to the on-chip comparators will not rise
above V
if the H6061 is correctly programmed. With
switched-mode power supplies however, the DC-rough
voltage on power-up rises almost to its working level
before the 5 VDC line starts to ramp up. The H6061 has
been specially designed to work under these extreme
conditions but care must be taken not to exceed
absolute maximum ratings. In addition to the voltage
monitoring on pin V
, a final protection is given by the
H6061 monitoring its own V
supply. If a system
malfunction causes V
to fall below V
even though
pin V
IN
stays high, then all outputs go active at once.
Address
Decoder
Microprocessor
RAM
CS Disable
H6061
V
DD
S
R
V
IN
TCL
RC
5 V
Monitored Voltage
R
1
=470 k
C
1
= 220 pF
RES
NMI
T
TO
= ~250 ms
Fig. 9
RD
Latched
Address Bus
SEL
V
SS
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相關(guān)代理商/技術(shù)參數(shù) |
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| H6061258S | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:3 V Self Recovering Watchdog |
| H606125X8P | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:3 V Self Recovering Watchdog |
| H606125X8S | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:3 V Self Recovering Watchdog |
| H6061V25SO8A | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:3 V Self Recovering Watchdog |
| H6061V25SO8B | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:3 V Self Recovering Watchdog |
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