Linux/TMP125: Unable to read the data from the sensor

prasanna raghunathan

Part Number: TMP125

Tool/software: Linux

Hi I am trying to read data from the sensor. But all i am getting is a constant value 40206b00. This happens when I send a 0x3000 to put the device in one shot and shutdown mode and then read the latest converted data by sending a 0x2000. The SPI mode is set to 3.(CPOL=1 and CPHA=1). How do I check if the device is in shutdown mode or sending me the data ? I am using spidev to perform all the communications.

over 8 years ago

0 Ren Schackmann over 8 years ago

TI__Mastermind 42505 points

The device does not make temperature measurements while in shutdown mode. You will continue to read the same result from the temperature register until you initiate another one shot by writing to the configuration register.

Ren

0 prasanna raghunathan over 8 years ago in reply to Ren Schackmann

Prodigy 40 points

I sent a 0x3000(One shot) and then followed by a 0x2000(Shutdown) to read the data as mentioned in the datasheet. The value is 00000000 at all time.

0 Ren Schackmann over 8 years ago in reply to prasanna raghunathan

TI__Mastermind 42505 points

Please provide oscilloscope shots of your communication.

Ren

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Linux/TMP125: Unable to read the data from the sensor