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Ebyte E22-900M30S - Page 9

Ebyte E22-900M30S
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I
Chengdu
Ebyte
Electronic
Technology
Co,
Ltd.
E22-900M30S
User
manual
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VCC
SN
Brief
Connection
between
Module
and
Single
Chip
Microcomputer
1
The
I00. 101. 102,
103
in
MCU
means
the
10
port
of
MCU.
DIOI1.
DIO2
is
the
normal
IO
port,
which
can
be
configured
to
multiple
function.
The
DIO2
can
2
connect
with
TXEN,
but
not
with
the
IO
port
of
MCU.
It’s
used
to
control
RF
switch,
see
more
details
in
SX1262
datasheet.
Also
It
can
be
floated
when
not
in
use.
3
The
DIO3
is
powered
by
a
32MHz
TCXO
crystal.
4
Ensure
the
good
grounding,
large
area
of
paving,
small
the
power
supply
ripple,
the
filter
capacitor
should
be
increased
and
as
close
as
possible
to
the
VCC
and
GND
pins
of
module.
5
It is
recommended
to
add
200R
protection
resistor
to
RXD/TXD
of
external
MCU.
Note:
It
is
recommended
to
use
DC
stabilized
power
supply
to
supply
power
to
the
module.
The
power
supply
ripple
coefficient
is
as
small
as
possible,
and
the
module
needs
to
be
reliably
grounded.
Please
pay
attention
to
the
correct
connection
of
the
positive
and
negative
poles
of
the
power
supply.
If
the
reverse
connection
is
connected,
the
module
may
be
permanently damaged.
Please
check
the
power
supply
to
ensure
that
between
the
recommended
supply
voltage,
if
exceeding
the
maximum,
the
module
will
be
permanently
damaged.
Please
check
the
stability
of
the
power
supply,
the
voltage
can
not
be
significantly
frequent.
When
designing
the
power
supply
circuit
for
the
module,
it
is
often
recommended
to
reserve
more
than
30%
of
the
margin,
and
the
whole
machine
is
beneficial
for
long-term
stable
operation.
The
module
should
be
as
far
away
as
possible
from
the
power
supply,
transformers,
high-frequency
wiring
and
other
parts
with
large
electromagnetic
interference.
High-frequency
digital
traces,
high-frequency
analog
traces,
and
power
traces
must
be
avoided
under
the
module.
If
it
is
necessary
to
pass
through
the
module,
assume
that
the
module
is
soldered
to
the
Top
Layer,
and
the
copper
is
spread
on
the
Top
Layer
of
the
module
contact
part(All
copper-covered
and
well
grounded),
and
must
be
close
to
Copyright
©2012-2018,
Chengdu
Ebyte
Electronic
Technology
Co.
Ltd.
7

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