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'[EE] New USB chip from Maxim'
|Has anybody else seen these? any opinions?
It's a SPI based full speed USB interface
Product page <http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4751>
>From the product page:
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 SIE (serial-interface
engine) 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 using the simple 3- or 4-wire SPI
Internal level translators allow the SPI interface to run at a system
voltage between 1.71V and 3.6V. USB timed operations are done inside the
MAX3420E with interrupts provided at completion so an SPI master does not
need timers to meet USB timing requirements. The MAX3420E includes four
general-purpose inputs and outputs so any microprocessor that uses I/O pins
to implement the SPI interface can reclaim the I/O pins and gain additional
The MAX3420E operates over the extended -40°C to +85°C temperature range and
is available in a 32-pin TQFP package (7mm x 7mm) and a space-saving 24- pin
TQFN package (4mm x 4mm).
Wow! It looks good, if they will actually STOCK any parts.
It reminds me of the SPI serial interface they sell. It worked
OK, had a quirky oscillator, but was fixable.
Denny Esterline wrote:
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On 2/7/06, Denny Esterline <tds.net> wrote: firmware
> Has anybody else seen these? any opinions?
> It's a SPI based full speed USB interface
Looks nice, but can you GET them?
That's always been my beef with maxim, design in their parts, then find out
that there's a 16 week leadtime that gets extended by a week every week.
|On Tue, 7 Feb 2006 11:44:43 -0500, you wrote:
>On 2/7/06, Denny Esterline <tds.net> wrote: firmware
>> Has anybody else seen these? any opinions?
>> It's a SPI based full speed USB interface
>Looks nice, but can you GET them?
>That's always been my beef with maxim, design in their parts, then find out
>that there's a 16 week leadtime that gets extended by a week every week.
Absolutely, and they don't supply any drivers for the host end either.
Only of any interest if you need the speed of the SPI interface (in which case you may be better off
using a MCU with embedded USB), and have the time to write a PC driver.
Maybe you can write it while you're waiting for the production parts to arrive ;-)
Nice quote from their FAQ comparing with USB-Serial bridge chips :
"Support: A product you design using one of these chips will require the companion driver to be
installed by your customer. Because it is a custom driver, it is not guaranteed to work with future
versions of the operating system. If you choose this approach, try to make sure that the vendor is
committed to supporting the driver for the lifetime of your product."
They seem to be implying that this is a disadvantage of using a USB-Serial chip - If you use a chip
like the FTDI, you know they will update the drives quickly becase so many people are using them.
With the Maxim chip, you have to keep track of all the new ways Windows gets broken and update the
driver yourself as necessary....
> Absolutely, and they don't supply any drivers for the host end either.
Eww. I was afraid of that.
Those MAX3100 uarts looked like a good idea too, till I realized that I
could do a better job with little AVRs, at lower cost.
On Tue, 2006-02-07 at 03:08 -0500, Denny Esterline wrote:
> The MAX3420E operates over the extended -40Â°C to +85Â°C temperature range and
> is available in a 32-pin TQFP package (7mm x 7mm) and a space-saving 24- pin
> TQFN package (4mm x 4mm).
Sounds nice. But of course, something which is VERY common with Maxim
these days (aside from other things) is ZERO hobbyist friendly packages.
I'm not even asking for DIP, just a SSOP package would be good enough.
Personally I never even consider Maxim any more. What good is a part if
you need to fab a board just to try it out.
This is one area where MChip is still king, pretty much everything they
offer has a hobbyist friendly package.
Herbert's PIC Stuff:
Wouter van Ooijen
> > Has anybody else seen these? any opinions?
> > It's a SPI based full speed USB interface
> > MAX3420E
> Looks nice, but can you GET them?
> That's always been my beef with maxim, design in their parts,
> then find out
> that there's a 16 week leadtime that gets extended by a week
> every week.
And worse: they often are available as samples, which lures you into
false warm feelings about the availability! I'd call this the
availablity inversion syndrome: you can get 2, but you can't get >2.
Exactly the opposite of the Motorola syndrome (you can get 10k, but only
if you buy that amount annualy).
Wouter van Ooijen
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu
David VanHorn wrote:
> Looks nice, but can you GET them? That's always been my beef with maxim,
> design in their parts, then find out that there's a 16 week leadtime
> that gets extended by a week every week.
Yes, or you get 10, and when you get them, there are 425 more available
/now/. Makes you feel safe. Then, five weeks later, when you need 50, none
are available, and the lead time is those 16 weeks :)
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