USB interface

A small micro with a regular serial port ie PIC, ATMEL, etc, a MAX232 level shifter , a usb to 232 adapter (about 10$) and this software will get his data into a terminal program where he can cut and paste.

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Steve

Reply to
osr
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No, I mean what type of processor, FPGA, logic circuits are involved.

The actual data does't matter.

Since this is a new design, look at LPC2148.

This one is ready to use:

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There are app notes and lots of source code out there to make a USB data logger. The storage of data can be in FLASH or RAM.

And the chip can plug into a USB port to be read.

You seem to be hung up on the data storage being a RAM chip.

Why ??

If this device will be portable, then some sort of battery will be required to "hold up the RAM" till it gets to the PC.

don

Reply to
don

wrote in news:9pDwl.14738$ snipped-for-privacy@flpi148.ffdc.sbc.com:

There are many products that connect to a computers USB port and provide one or more serial ports. The drivers that come with them often provide a virtual serial port to programs running on the computer.

If you are looking for something to embedd in a design, look at

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The last time I looked, they even offered drivers for Linux on the PC side of things.

Robert H.

Reply to
Robert

Acutally I can put the routine to read the serial port into the program.

Bob

Reply to
<castlebravo242

I can get data retention currents as low as 2 ua. A battery is required anyway when operating.

Bob

Reply to
<castlebravo242

FT245XX.

Bob

Reply to
<castlebravo242

You realize you are using a 50$ RAM that can run at 100MHz for something a 2$ bottom of the barrel USB flash drive is meant for?

Reply to
a7yvm109gf5d1

OK... check out something like this:

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... not spendy, easy to use, and readily available.

If you start finding yourself having to add a bunch of logic to interface that chip to your SRAM, you might re-think Linnix's suggestion to just use a microcontroller instead. If you already know how to program, it's generally faster to build "glue logic" in software than in hardware, and many microcontrollers have built-in USB interfaces... or can very easily be interfaced to a RS-232 to USB converter chip such as FTDI's FT232 series.

---Joel

Reply to
Joel Koltner

this:

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not spendy, easy to use, and

Or, check out this ready to use 70g vibration data logger with detachable USB key. We are looking into optional 16 M bytes serial flash (spec provided)

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We have already done it.

My customer is going to get angry for this discussion, but I did not start it.

Reply to
linnix

Looks nice. If the OP can buy one of those from you cheaply enough, I'd recommend doing so.

Reply to
Joel Koltner

You forgot about the temporal mid storage point that he WANTS to have. If he gathers the data in one location, and THEN takes it to the PC for transfer, your solution isn't one... at all. There must be a data-to-storage step BEFORE the PC transfer.

Reply to
FatBytestard

Yet another drawback. Yet another reason to write to a device that does not require power to retain the data.

If he simply writes files out to a standard USB stick of ANY size, he will be in data integrity heaven. I suggested this in an earlier post, but did not mention this additional volatility as a reason. It happens to be the best reason.

Reply to
FatBytestard

When was the last time you looked at the original post made in a thread? He wants to make a PORTABLE device and interface to a computer LATER on down the line. Sheesh!

Reply to
FatBytestard

Or solar, or a potato(e)... or an apple even!

STILL a non-volatile solution is best for overall data integrity.

Reply to
FatBytestard

this:

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not spendy, easy to use, and

Jeez, Louise, couldn't you have used button batteries with that? Or does the USB stick draw too much?

You did, however, join it. D'oh!

Reply to
FatBytestard

Seems that you have a personality defect.

Reply to
richard

I assumed the OP would keep his 4 megabytes of RAM and his counter, and would just tristate the counter when he was ready to let the uP take over the readout.

Shame on me for assuming.

:-)

Steve

Reply to
osr

And no storage required in the device.

Bob

Reply to
<castlebravo242

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says 175mA active, 25mA standby. Where did you get the 2uA data retention?

Reply to
linnix

this:

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not spendy, easy to use, and

The USB uC is only needed for data downloading. The LCD uC and sensor take 4mA to 5mA. Button cell onlt last for days. AAAs lasts for weeks.

that

Reply to
linnix

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