參數(shù)資料
型號(hào)： 7643
英文描述： IrDA. protocol handler plus endec for DCE Apps, -40C to +85C, 18-SOIC 300mil, TUBE
中文描述： 7643Group數(shù)據(jù)表數(shù)據(jù)表1369K/JUL.30.03
文件頁數(shù)： 116/120頁
文件大小： 1369K
代理商： 7643
Rev.1.00 Jul 30, 2003 page 116 of 119
7643 Group
USAGE NOTES
Oscillator Connection Notice
The built-in feedback register (1 M
) and the dumping resistor
(400
) is internally connected between pins X
IN
and X
OUT
.
Power Supply Pins Treatment Notice
Please connect 0.1
μ
F and 4.7
μ
F capacitors in parallel between
pins Vcc and Vss, and pins AVss and AVcc.
These capacitors must be connected as close as possible be-
tween the DC supply and GND pins, and also the analog supply
pin and corresponding GND pin.
Wiring patterns for these supply and GND pins must be wider than
other signal patterns.
These filter capacitors should not be placed near the LPF pins as
they will cause noise problems
Reset Pin Treatment Notice (Noise
Elimination)
If the reset input signal rises very slowly, we recommend attaching
a capacitor, such as a 1000 pF ceramic capacitor with excellent
high frequency characteristics, between the RESET pin and the
Vss pin.
Please note the following two issues for this capacitor connection.
(1) Capacitor wiring pattern must be as short as possible (within
20 mm).
(2) The user must perform an application level operation test.
LPF Pin Treatment Notice
All passive components must be located as close as possible to
the LPF pin.
0
.
1
μ
F
6
8
0
p
F
L
P
F
p
i
n
A
V
S
S
p
i
n
1
k
Fig. 101 Passive components near LPF pin
USB Transceiver Treatment (Noise
Elimination)
The Full-Speed USB2.0 specification requires a driver -imped-
ance 28 to 44
.
(Refer to Clause 7.1.1.1 Full-speed (12 Mb/s)
Driver Characteristics in the USB specification.) In order to meet
the USB specification impedance requirements, connect a resis-
tor (27
to 33
recommended) in series to the USB D+ pin and
the USB D- pin.
In addition, in order to reduce the ringing and control the falling/
rising timing of USB D+/D- and a crossover point, connect a ca-
pacitor between the USB D+/D- pins and the Vss pin if necessary.
The values and structure of those peripheral elements depend on
the impedance characteristics and the layout of the printed circuit
board. Accordingly, evaluate your system and observe waveforms
before actual use and decide use of elements and the values of
resistors and capacitors.
Connect a capacitor between the Ext. Cap. pin and the Vss pin.
The capacitor should have a 2.2
μ
F capacitor (Tantalum capaci-
tor) and a 0.1
μ
F capacitor (ceramic capacitor) connected in
parallel. Figure 102 for the proper positions of the peripheral
components.
X
I
N
e
n
a
b
l
e
l
o
c
k
F
S
E
L
S
U
S
B
C
5
e
n
a
b
l
e
U
(
4
S
8
B
M
C
H
l
o
z
c
)
k
U
e
S
a
B
b
e
F
C
U
n
l
U
S
B
C
7
U
t
r
S
a
B
n
s
c
e
i
v
e
r
e
n
a
b
l
e
U
S
B
C
7
D
C
-
D
C
c
o
n
v
e
r
t
e
r
e
n
a
b
l
e
U
S
B
C
4
c
m
u
r
r
d
e
e
n
t
o
U
S
B
C
3
E
x
t
.
C
a
p
.
2
.
2
μ
F
0
.
1
μ
F
D
+
D
-
1
.
5
k
F
r
e
q
u
e
n
c
y
S
y
n
t
h
e
s
i
z
e
r
N
o
t
e
1
N
o
t
e
s
1
:
I
c
T
n
o
h
V
n
e
c
v
c
e
r
e
r
s
=
t
e
i
3
r
s
.
t
o
3
o
r
s
V
t
h
,
e
a
c
o
E
l
u
n
x
e
n
t
.
s
e
C
d
c
t
a
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t
p
p
o
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p
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V
i
d
c
c
.
o
.
I
n
V
c
c
=
5
V
,
d
o
n
o
t
c
o
n
n
e
c
t
t
h
e
e
x
t
e
r
n
a
l
D
C
-
D
C
t
n
2
:
v
n
t
h
e
l
a
y
o
u
t
o
f
t
h
e
p
r
i
n
t
e
d
c
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i
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d
.
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e
2
Fig.102 Peripheral circuit
In Vcc = 3.3 V operation, connect the Ext. Cap. pin directly to the
Vcc pin in order to supply power to the USB transceiver. In addi-
tion, you will need to disable the DC-DC converter in this
operation (set bit 4 of the USB control register to “0”.) If you are
using the bus powered supply in Vcc = 3.3 V operation, the DC-
DC converter must be placed outside the MCU.
In Vcc = 5 V operation, do not connect the external DC-DC con-
verter to the Ext. Cap. pin. Use the built-in DC-DC converter by
enabling the USB line driver.
Make sure the USB D+/D- lines do not cross any other wires.
Keep a large GND area to protect the USB lines. Also, make sure
you use a USB specification compliant connecter for the connec-
tion.
AVss and AVcc Pin Treatment Notice (Noise
Elimination)
An insulation connector (Ferrite Beads) must be connected be-
tween AVss and Vss pins and between AVcc and Vcc pins.
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