I2C temperature chip 8DIP?

verobel

Fellow Stampers;

I am looking for and I2C temperature chip in a DIP package. The closest I have found is the TMP100 from TI in SOT-23-6 package. I have a DS1602, but have an application where I am short of I/O pins, and I already am using I2C to a memory chip 24LC32A. So if I could find a I2C temperature chip with DIP, I could use it on the same I2C lines (bus).

If you are aware of any such chip and where I could get it...that would be great.
Thanks, John

RDL2004

DS1621/DS1631

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- Rick

verobel

The DS1621 looks like a newer version of the DS1602. If I had enough pins available I would use it, but I don't have any pins available so I was hoping to use an I2C chip in an DIP package because I already am using 2 wires for another I2c memory chip 24LC32A. That way I could use the same two pins ( max. 8* I2c devices on the bus). It doesn't look like DS1621 is I2C.
John

pwillard

DS1621 - DS1631 are I2C interface.

Keep in mind that I2C is a trademark of PHILIPS so it also goes by a more generic name of "2-wire".

PIN SYMBOL DESCRIPTION
1 SDA Data Input/Output Pin for 2-Wire Serial Communication Port. Open-Drain.
2 SCL Clock Input Pin for 2-Wire Serial Communication Port.

When you see SDA and SCL it's a giveaway that it's I2C.

Hope that helps.

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There's nothing like a new idea and a warm soldering iron.

RDL2004

It is the I2C version of the 1620.

Nuts and Volts 111

I checked the usual suspects for the DS1621 and only Digi-Key had them in stock. Didn't look for the 1631.

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- Rick

verobel

Ok, If I understand correctly, 2 wire SMBus and I2C are very similar and both use SDA and SCL. The 1620 is 2 wire but not exactly I2C. I'm not sure if it is just a Philips trademark issue or if all 2 wire devices are actually completely hardware interchangeable and can use I2CIN/OUT commands. Still need some clarification here. Digikey show I2C and 2 wire SM Bus as seperate communication options on many chips. Something tells me that I2CIN/OUT will not work with the 1620 but apparently it will with the 1621.

The 1621 is 2 wire and supports I2C (according to the Nuts and Volts 111 article). So if I use the 1621 ( available from Digi-Key in DIP package) I will be able to use the I2CIN/OUT commands

For now, it looks like I'll be ordering a $1621 from digikey for $4.61
John

ps. we should have a list at the Parallax site listing all known I2C chips that will work(have been tested) with stamps. I have come across:
1. 1621 temperature sensor
2. 24lc32 memory/storage chips of various sizes
3. 8591 a/d, d/a
4. 8574 i/o expander..that didn't work. could replace with mcp23016