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This is a simple driver for the Maxim MAX521 8 channel digital to analogue converter (DAC). It assumes that I2C has been set up elsewhere in your program.

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Ben, just set A4 to float. (input). That should sort the problem without hardware modification.
Sorry I couldn't be more helpful on the DIY board.

Do you mean a one-off configuration? That is, you only want to write to the EEPROM once on the first powerup after the device has been programmed, but ignoring the initialization routine at the next a ...

...or you pull down the CTS Line. In standart configuration the modem should interpret this as ATH !

DTR actually, for every modem I've come across.

As I said, read the datasheet and look for the traps...

The device powers up in low power standby mode. Your code as it stands won't work because you don't make any attempt to enable the LED driver ...

I posted some code for a MAX6953 under my old username quite a while back. That should illustrate the things you have to do.
It's been a long time since I used it and my copy of the datasheet is buri ...

I've had problems with this device with the brownout voltage select not programming correctly. It didn't matter in my application so I just ignored it, although this fuse worked properly in a 4520.
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I've never had any serious problems with solderless breadboards either. In fact, they've saved me a whole heap of development time. I've run many different types of PIC, with clock rates from 1-16MHz ...

Thw 2520/4520 series has some silicon problems. I suggest you read the Silicon Errata document available on the Microchip website to see if any of the information is applicable to you.

As you seem ...

I suspect that when Microchip get the bugs out of the silicon the 4520 will become a very popular chip - and, as the replacement for the 452, I would expect CCS to provide support for it in a future v ...

The 452 might be technically obsolete, but if you've got a stock of the things then keep using them in preference to the 4520. At the moment the 4520 (and 2520) is a nightmare.

The thread reference ...

Well, I've got quite a lot of these 4520s, and Digikey seem a tad expensive to me - my company is only a two man outfit and we're not rich enough to take that kind of loss lightly. I've been giving it ...

Short answer is yes, you can.

Unfortunately, the distributor I have to deal with has already stopped stocking 452s without warning, hence the change. Oh, and I thought they were equivalent, too! Maybe I'll just prune back the code ...

These 4520s of mine seem intent on a rapid and violent journey to the nearest bin! After yesterday's WDT bother, the MSSP module is now playing silly bu***rs - actually, it won't work at all.

Using ...