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TMP112 High Speed Mode

Natália Jardim
Prodigy 120 points
Other Parts Discussed in Thread: TMP112

Hello,

I'm using TMP112 and I want to use it at high speed mode but the datasheet seems very remote about it. What I'm doing now it's this:

start I2C

write 0x08 at TMP112 (which means higs spees mode according to the datasheet)

write slave address with R/W bit set

receive data from TMP112

stop I2C

but when I send 0x08 the sensor stop working and normally works without it, can somebody help me whit this problem?

  • 0
    TI__Genius 15760 points

    Hi Natalia,

    Thanks for posting in TI E2E forums. We will review your question and will get back to you after Tuesday.

    Best regards,

    Mayrim

  • 0
    TI__Expert 7945 points

    Hello Natailia,

    Please do not send a STOP at the end of your communication if you intend to stay in HS mode. STOP will get the device out of HS mode. 

    Procedure to get into High speed mode is as follows;

    1.Start

    2. 0x08

    3. NACK by TMP112

    4. Start + I2C slave Adderes+R/Write Communication

    5. Repeat Start......

    You will notice that after sending the initial 0x08, everything else is exactly same as what you did in the other mode with an exception of not using a STOP.

    Never use a STOP unless your intention is to get out of HS mode. After you send the initial 0x08 you should be able to communicate at 3.4MHz.

    Best regards,

    Abhi