CIRCUIT DESIGN MU1-USB Manuale operativo - Pagina 15

Sfoglia online o scarica il pdf Manuale operativo per Interfacce USB CIRCUIT DESIGN MU1-USB. CIRCUIT DESIGN MU1-USB 17. Embedded low power radio modem mu-1/mu-1 usb interface kit

Stampa la pagina

Chapter 6 When Designing an Original System

When designing an original USB interface system similar to the MU1-USB using the MU1-USB (MU-1 +
MU1-USBIF) mounted with the MU-1, bear in mind the items explained below.

6.1 The Circuits

Although the circuit diagram shown in this operation guide is a proper circuit, even when made in accordance with
the circuit diagram, it may not perform well due to high frequency noise from the surrounding circuitry.
Bear in mind the following when designing circuits.
1. Exercise caution in placement of the MU1 and USB chip. In addition, there are cases where shielding is
necessary around the chip.
2. Add a noise filter to the USB interface signal wire.
3. Ensure a sufficiently large ground pattern for the MU-1. In addition, provide shielding for the signal wire too.
Use a double shield USB cable (USB 2.0 High Speed).
In order to assess the performance of your circuit board, issue the '@RA' command to acquire the RSSI level of the
MU-1 and check the level. It is necessary to acquire and assess the level of all the channels. Set a standard lower
than the value acquired with the MU1-USB. Here it is convenient to use the air monitor of the MU-1 evaluation
program. In order to use the air monitor function, it is necessary to make a design in which the terminals of the MU-1
can be controlled from the outside.
6.2 The USB Driver
If you design an original system with a USB interface, you will need a unique vendor ID. Vendor IDs are obtained
from USB-IF. For details, refer to the site below.
USB-IF website URL: http://www.usb.org/developers/vendor/
When you have a vendor ID, you can write it to the chip using an EEPROM programmer (MProg or the like) provided
by FTDI.
In addition, although you can use the FTDI USB driver, it is necessary to change several of the driver related files in
order to make the driver proprietary. Edit the Ftdibus.inf, Ftdiport.inf, Ftdiunin.ini, and Ftdiun2k.ini files in the driver
folder to make them apply to your company.
OG_MU1-UIK_v20e
14
OPERATION GUIDE
Circuit Design, Inc.