Maxim Integrated MAX3420E User Manual

Frequently asked questions about the max3420e

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Keywords:

USB, FAQ, MAX3420E, SPI, peripheral, controller, interface

APPLICATION NOTE 3597

Frequently Asked Questions About the MAX3420E

Sep 15, 2005

Abstract: This application note lists frequently asked questions (FAQs) about the MAX3420E peripheral
controller with SPI™ interface.

1.

General questions

1.

What is the MAX3420E?

2.

Does the MAX3420E include a microprocessor?

3.

What packages are available for the MAX3420E?

4.

Are the MAX3420E packages lead-free?

2.

USB questions

1.

What USB speeds does the MAX3420E support?

2.

Does the MAX3420E comply with the USB spec? Which revision?

3.

How many endpoints does the MAX3420E support?

4.

Why doesn't the MAX3420E support isochronous transfers?

5.

Can I use the MAX3420E in a self-powered peripheral?

6.

Can I use the MAX3420E in a bus-powered peripheral?

7.

What external circuitry do I need to connect the MAX3420E to USB?

8.

Can you recommend a 3.3V regulator?

9.

What does the CONNECT bit do?

3.

Interface questions

1.

How does a microprocessor connect to the MAX3420E?

2.

You say the SPI interface is 3, 4 or 5 wires. What does this mean?

3.

What SPI clocking modes does the MAX3420E support?

4.

My CPU uses a 2.5 volt supply, but the MAX3420E uses a 3.3V V

CC

supply. Do I need

external level translators?

5.

What is the purpose of the MAX3420E INT pin?

6.

Does the MAX3420E support active-low wired-OR interrupts? How about edge active
interrupts?

7.

How fast can I run the MAX3420E SPI interface (SCLK max frequency)?

8.

Is there a low limit to the MAX3420E SCLK frequency?

9.

I have an 8-pin microprocessor, and it takes 5 of its' IO pins to connect to the MAX3420E.
How do I do IO?

10.

Do I need to add external pullup resistors to the GPIN pins?

11.

Can I drive optocouplers from the SPI interface pins?

12.

What is the purpose of the VBCOMP pin? Does it power the MAX3420E?

4.

Programming questions

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