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| 型號(hào)： | 7641 |
| 英文描述： | 7641 Group Datasheet Datasheet 2145K/MAR.26.02 |
| 中文描述： | 7641組數(shù)據(jù)表數(shù)據(jù)表2145K/MAR.26.02 |
| 文件頁(yè)數(shù)： | 133/137頁(yè) |
| 文件大?。?/td> | 2145K |
| 代理商： | 7641 |
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132
7641 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
USAGE NOTES
Oscillator Connection Notice
The built-in feedback register (400
) is internally connected be-
tween 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
Rest 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. 111 Passive components near LPF pin
USB Transceiver Treatment (Noise
Elimination)
The USB specification ver. 1.1 requires a driver -impedance 28 to
44
.
(Refer to Clause 7.1.1.1 Full-speed (12 Mb/s) Driver Char-
acteristics in the USB specification.) In order to meet the USB
specification impedance requirements, connect a resistor (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 112 for the proper positions of the peripheral com-
ponents.
X
I
N
e
n
a
b
l
e
lock
FSE
L
S
USBC5
enable
U
(
4
S
8
B
M
C
H
l
o
z
c
)
k
USB FCU
enable
USBC7
U
t
r
S
a
B
n
s
c
e
i
v
e
r
enable
U
S
B
C
7
DC-DC converter
enable
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
Frequency Synthesizer
N
o
t
e
1
Notes 1
: In Vcc = 3.3 V, connect to Vcc. In Vcc =5 V, do not connect the external DC-DC
converter to the Ext. Cap pin.
2
: The resistors values depend on the layout of the printed circuit board.
N
o
t
e
2
Fig.112 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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| 764-1"x36yd-Black | 功能描述:膠帶 BLACK 1X36YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 764-1"x36yd-Blue | 功能描述:膠帶 764 BLUE 1X36YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
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| 764-1"x36yd-Red | 功能描述:膠帶 764 RED 1X36 YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
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