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Max frequency: USB,Wireless

pocho
Intellectual 260 points
Other Parts Discussed in Thread: MSP430F2274, MSP430F5528

Hi All,

I want to use eZ430-RF2500 with the MSP430F2274 microcontroller.
I can not find some information in the datasheet.
I would like to ask what is the maximum frequency can be set to the USB port? (using uart with 8 bits and baud rate 9600)
What is the maximum frequency set for the wireless connection?

thanks

  • 0
    Guru 46710 points

    Manuel Corini said:
    I would like to ask what is the maximum frequency can be set to the USB port? (using uart with 8 bits and baud rate 9600)

    Frequency of what? USB bitrate? It is fixed and you cannot set it. Perhaps you shall clarify your question in more details - what exactly you want to know and why

    Manuel Corini said:
    What is the maximum frequency set for the wireless connection?

    2483.5 MHz

  • 0
    Guru 33653 points

    Manuel Corini said:

    I would like to ask what is the maximum frequency can be set to the USB port? (using uart with 8 bits and baud rate 9600)

    On all TI FET's (except new MSP430F5528 based LP) USB-UART bridge is limited to 9600 bps. Maximum USB transfer rate on MSP430 devices with hardware USB module is 1 MByte/s.

  • 0 in reply to zrno soli
    Intellectual 260 points

    I wanted to know the maximum frequency in Hz USB communication

  • 0 in reply to pocho
    Guru 58965 points

    USB is a wired serial bus. It dose not use any carrier and has no "frequency" to speak of. The "High Speed USB" has a specified data rate limit of 480 M-bit-per-second (60 M-byte-per-second). But in practice, you can only get a small fraction of that rate.

    When power by the Power Grid, the frequency is usually 50 or 60 Hz. When power by batteries, you can say it is 0 Hz. This has nothing to do with USB. But USB does need power.

    "Wireless" communication can use accusative wave, light wave, radio wave, etc. The Carrier Frequency varies in a very wide range. This has nothing to do with USB. And USB does not necessarily need Wireless: Wireless does not necessarily need USB either.

  • 0 in reply to old_cow_yellow
    Guru 227245 points

    Well, the answer regarding USB isn’t exactly right. Baudrate isn’t throughput.
    USB uses three (well, now 4) different baudrates, ranging from 1.5MBd to 480MBd. These are fixed. Due to high-level protocol overhead, handshakes, packaging etc, you won’t get the throughput you would expect from such a high baudrate. The smaller the data chunks are, and the more devices are connected (or the more HUBs are in the chain), the less throughput you get.
    The MSP’s USB controller uses full speed, which is 12MBd. Always. But that of course doesn't mean 1.2MB/s throughput.

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