driver. Instead, Maxim supplies example firmware to illustrate how to conform to a standard Windows device class (HID), and thereby to use a built-in Windows driver. The advantages to the MAX3420E approach are performance, flexibility and support.Performance: The MAX3420E SPI port (its interface to the controller) can run up to 26MHz. If the controller supports a high SPI clock rate, the MAX3420E can support USB transfers up to the maximum available full-speed bandwidth of 12Mbps
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Flexibility: The personality of a device using the MAX3420E is entirely determined by its firmware. Therefore, it can implement any type of USB device.
Support: Once operating systems natively support general USB (BULK) transfers, the need for serial-USB bridge chips will rapidly diminish.