TMP144EVM: How to read the TMP144 senor over Externmal serail port.

When transmitting the commands, you must wait to receive the echo (and response, for read transactions) before transmitting again. 

Please share your schematic and oscilloscope pictures of the bus activity.

thanks,

ren

Hi , Ren 

    I didn't now have new schematic . I Just use  the TMP144 EVK baord directly and only used  and USD to serail port to connect to RX TX and GND.

If U9 logic translator is powered on the EVM, it will interfere with your attempts to transmit. It would be best to disconnect the sensors at the perforation.

Please share oscilloscope pictures of the bus activity.

thanks,

ren

Hi,  Ren 

     I just check the baord .And I tried to click S1 off to see any different .  The D2 LED will be light on. 

And now I can not connect the over over GUI now. I am not sure did I do any wrong operation. 

I checked the EVM TX is alway be high(3.3V ). 

As you said the U9 will impact the exteranl port. So does it will working if I cut off the board 

to dicusconnet the U9 and sesor baord. and if I cut off it does the command command wil be different ?

Thanks
Kent Yeh

S1 is not helpful in your case. To prevent U9 from interfering, I recommend breaking the board at the perforation (red line.) You can reconnect the boards on a proto board if needed. 

The commands sent assume 4 devices. There is no change to the commands unless you separate the individual TMP144 boards.

thanks,

ren

Hi, Ren

  I try to cut off the baord but still not able to receive any feedback. I not sure does my EVM baord was damaged ?

BTW want to double check did I need to connect 3.3V for the sensor baord?