TMP117: Temperature Sensor TMP117. During the test, we found that one of the sensors (Sensor address 90) often read abnormal temperature values.

2018

Part Number: TMP117

1) the schematic diagram of this Sensor application is as follows.Two TP sensors TMP117 share one I2C, and two IC's share one power supply.

The Sensor at address 92 has been working normally, but the temperature value read by the Sensor at address 90 is often abnormal.

Could it be some other interference?

Or is there something we should pay attention to when reading the I2C signal?

over 3 years ago

0 Ren Schackmann over 3 years ago

TI__Mastermind 35855 points

Could you share the oscilloscope waveforms for SCL and SDA? If you could capture the failure, that'd be great, but a capture of working communication would help as well.

thanks,

ren

0 Gordon Varney over 3 years ago

TI__Expert 8810 points

I was just wondering:

What are the pull up resistor values on the I2C SDA and SCL lines?

What is the VDD voltage that you are using to power the TMP117?

Is R1 a 470 Ohm resistor?

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TMP117: Temperature Sensor TMP117. During the test, we found that one of the sensors (Sensor address 90) often read abnormal temperature values.