Maxim HFRD-34.0 manual MAX3420, MAX4788, Navigation Menu

	The MAX3420E contains the digital logic and analog circuitry necessary to implement a full-
	speed USB peripheral compliant to USB specification rev 2.0. A built-in full-speed transceiver
	features ±15kV ESD protection and programmable USB connect and disconnect. An internal
MAX3420	serial-interface engine (SIE) handles low-level USB protocol details such as error checking
	and bus retries. The MAX3420E operates using a register set accessed by an SPI™
	interface that operates up to 26MHz. Any SPI master (microprocessor, ASIC, DSP, etc.) can
	add USB functionality by using the simple 3- or 4-wire SPI interface.
	Additional information:
	www.maxim-ic.com/MAX3420
	The MAX4785–MAX4788 family of switches feature internal current limiting to prevent host
	devices from being damaged due to faulty load conditions. These analog switches have a low
	0.7Ω￿on-resistance and operate from a 2.3V to 5.5V input voltage range. They are available
	with guaranteed 50mA and 100mA current limits, making them ideal for load-switching
MAX4788	applications.
	Additional information:
	www.maxim-ic.com/MAX4788

7 Navigation Menu

HFRD-34.0 is controlled through an easy-to-use navigation switch (up, down, left, right, and push to select) and LCD display. Through this menu-

Table 1. Navigation Menu Details

based interface, the user can set, save, and load configurations and control a variety of other features available in the reference design. The table below details the menu options available.

Menu*	Index	LCD Label	Action Taken by Pushing “Select” on Menu It em
MM	1	Configuration	Configuration Menu (CM) is opened
MM	2	Video Switch	Video Switch Menu (VSM) is opened
MM	3	Audio Switch	Audio Switch Menu (ASM) is opened
MM	4	USB Switch	USB Switch Menu (USM) is opened
MM	5	Audio Control	Audio Control Menu (ACM) is opened
MM	6	Advanced Ctrl	Advanced Control Menu (ADVM) is opened
CM	1	Load Config	Opens a menu to allow the user to load one of four saved
			configurations.
CM	2	Save Config	Opens menu to allow the user to save the current configuration to
			one of four memory locations. Saved configurations are retained
			during power cycles.
Reference Design HFRD-34.0 (Rev.3, 05/08)				Maxim Integrated Products
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