Re: Micro Controller Advice/Help Needed

Rich - It seems like the LPC2138 or LPC2136 might provide a very simple
solution. Correct me if I'm wrong, but it looks like with one of these
chips, all I'd need to do is get a UART<->RS232 interface chip to put in
between the LPC213X and my XE2422H. Add on a power adapter and an RJ-11
jack, and that's literally 100% of my BOM (or so I'm thinking).

The only other thing I'm not quite clear on is the best mechanism to
program the LPC chip's flash prior to shipping a product. On a test device,
this should be easy, but I'm assuming I'd have to provide some sort of
harness for programming this thing. I guess I could use the other UART and
provide some sort of serial port pinout on the side of the board?

Dean

On Mon, 11 Aug 2008 21:27:17 -0500, "deanvesuvio"
<deanvesuvio@xxxxxxxxx> wrote:

I'm building a small device that will talk to the world through a
modem.
I've ordered the XE2422H devkit from XEComm. It basically has a RJ-11
connector for the phone line and an RS232 connector for the controller.

I need a cheap microcontroller that's easy to deal with which I can
interface with the XE2422H. It will be doing data collection via the
modem,
so I'd like it to have at least 256KB of flash onboard where it can
store
and retrieve some data.

That amount of flash storage is available on-chip (e.g., NXP's LPC2138),
however since

Speed can be very slow.

you may want to look at the serial (SPI or I2C) interfaced EEPROM
memories (e.g., Microchip's 25LC1024 (note it's sized in bits)) or at
using an SPI-interfaced MMC/SD card which would give you the option of
an easy and removable interface to a desktop machine.

--
Rich Webb Norfolk, VA

.

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