first byte strings

shai kon

Expert 1960 points

Other Parts Discussed in Thread: TMP102

Hello,

I'm using an I2C host adapter with a TPM102 breakout board (PCB with the TPM102 sensor and pullup R's).

What byte string should I send to the device in order to get my first temperature reading?

over 15 years ago

0 shai kon over 15 years ago

Expert 1960 points

Anyone??

My question is very simple...What data should I send over the I2C bus in order to get my first temperature reading?

0 Art Kay over 15 years ago in reply to shai kon

TI__Mastermind 29398 points

Look at figure 13 in the TMP102 data sheet. The bytes you send will depend on the state of ADD0. The first byte is the I2C address. The i2c address selection is discribed in table 12. After sending the first byte you will need to send the pointer byte, and do a 16 bit read.

If you are not familiar with i2c I recomend looking at the wikipedia link below. Also we have a video discribign the operation of the serial-bus-evm. One part of the video covers i2c.

http://en.wikipedia.org/wiki/I%C2%B2C

http://www.ti.com/lit/zip/sbou075

0 shai kon over 15 years ago in reply to Art Kay

Expert 1960 points

Thanks Art!

I'm very familiar with i2c.

1.The ADD0 is grounded on my board - so the address should be 1001000 followed by a read bit ('0') (e.g: 10010000 for the first byte).

2.After the first byte is acknowledged I send a second byte: "00000000" ( the temperature pointer).

Following the above,16bit temperature readings should be sent by the TMP102 until a stop bit is issued by the master - Is this correct?

0 Art Kay over 15 years ago in reply to shai kon

TI__Mastermind 29398 points

Yes.

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first byte strings