Programming TMP102/TMP112 using TWI

RE: Programming TMP102/TMP112 using TWI

Gavin — Mon, 30 Nov 2015 21:20:19 GMT

No reply from TI, but can confirm from testing that it is the last bit of the first byte than needs to be set to put it into shutdown mode

RE: Programming TMP102/TMP112 using TWI

MartinBL — Fri, 25 Sep 2015 07:12:05 GMT

Oops, my bad. Edited the answer with a link now.

RE: Programming TMP102/TMP112 using TWI

Gavin — Thu, 24 Sep 2015 19:32:02 GMT

Very many thanks, Martin. Very helpful - I think I understand. I agree the datasheet is ambiguous about byte order and have contacted TI to point that out. I will test and post back here when I am confident I know what the answer is.

By the way, is your first sentence missing a link?

RE: Programming TMP102/TMP112 using TWI

MartinBL — Thu, 24 Sep 2015 08:15:21 GMT

I have posted a basic TWI driver example here. It is based on the drivers found in SDK V9.0.0 and simply scans your TWI bus for devices. It does not send any commands or anything like that. I'm afraid I don't have any TMP sensors to play with so I can't make a real example for you

Achieving what you want shouldn't be that difficult though.

Send a write command to the TMP's address (addresses specified in Table 4 in the TMP102 datasheet).
Continue with an memory address byte pointing to the configuration register (should be 0x01 according to Table 7).
Finally transmit two bytes where the last bit (the SD field) in the first byte is set to to shut the device off. I think the datasheet is a little unclear regarding the byte order so it might be the last bit in the last byte.