OG_MU4-USBIF_v10e 12 Circuit Design, Inc.
OPERATION GUIDE
When embedding theMU4-USB (MU-4 + MU4-USBIF) in a user system, pay due attention to the design of the board
and case.
This board is connected to a PC provided with a USB port. Connect the unit to the PC with the dedicated USB cable
provided. Power for the product is supplied from the PC through the USB cable.
If you house the product in a case, determine the position of the ground and antenna through a variety of tests.
In addition, if you attach LEDs to the case, connect them with inch-pitch through holes with reference to the diagram
below.
If you use a USB cable other than the one provided, use a double shield cable (USB 2.0 High Speed). Otherwise,
radio waves may not be emitted due to high frequency noise from the USB.
When using USB, pay attention to the total current capacity of the other equipment since it can result in malfunctions.
When marketing products that use this product, provide information about the current in your operation guide.
◼
4.1.1 Controlling the MU4-USB with a PC
MU-4
U
S
B
c
ab
le
User
PC
λ
/4 lead antenna *2
1
2
3
4
5
6
7
8
Power LED
Tx LED
Rx LED
RSSI
GND
GND
+3v
+3v
*
１
*
１
*
１
*
１
｝
To the
processing circuit
100pF
100pF
MU4-USB
Inch pitch through holes only.
If necessary, mount an 8-pin
socket, and attach external LEDs
etc.
USB-B
receptacle
100pF
Connecting external LEDs
・
To prevent noise, attach a ceramic
capacitor of about 100 pF to the LED.
・
Terminals 1, 3, and 5 there are 1k
Ω
resistors in the MU4-USB.
*1: Solder the terminal lug etc. and connect it to the user case
ground. Determine the connection point with various tests.
*2: If the antenna is bent to fit inside, the communication
range falls and communication errors become frequent. Do
Not put the antenna inside a metal case.
4.1 Embedding the Product
Chapter 4 How to Design a User System
