TI-RTOS I2C Light Sensor Address

Alessandro Sanginario

Other Parts Discussed in Thread: CC2650, OPT3001, CC2650STK

Hi all,

I followed the tutorial I2C_Light_Sensor for Sensor Controller Studio in which you will run and debug the full example code with the Sensor Controller Interface Driver (SCIF) on the CC2650 SensorTag + Debug DevPack in Code Composer Studio (CCS).

Everything works well but I don't understand this: when I am in CCS and I open the file scif.h under driver folder, I can read that the optical sensor address is:

#define SCIF_I2C_LIGHT_SENSOR_ALS_I2C_ADDR 138

tha is equal to 0x8A

If, instead, I open the file board.h I can read:

#define Board_OPT3001_ADDR (0x45)

So my question is: which one is the correct optical sensor address? Why there is this discrepancy?

The I2C address of a sensor should be independent from the rtos version used, am I right?

Thank you very much.

Regards,

Alessandro

over 8 years ago

0 Ramsey over 8 years ago

TI__Genius 12025 points

Allessandro,

The pin connection of the OPT3001 will determine the sensor's I2C address. I see you are using the CC2650STK. Looking at the schematic for this board, I see the ADDR (pin 2) pin is connected to VDD. Looking at the data sheet for the OPT3001, Section 7.3.4.1 indicates that with this connection the slave address should be 1000101 (0x45).

http://www.ti.com/tool/cc2650stk CC2650 SensorTag Product Folder

http://www.ti.com/lit/df/swrr134a/swrr134a.pdf - CC2650STK Schematic

http://www.ti.com/lit/ds/symlink/opt3001.pdf - OPT3001 Data Sheet

~Ramsey

0 Alessandro Sanginario over 8 years ago in reply to Ramsey

Prodigy 20 points

Thank you very much, that is clear.

So now I do not understand how can it work.

If the Sensor Controller can "manage" alone the sensor, how can it poll the optical sensor if it has a wrong address? I want to remember that the example actually works.

Thank you.

Alessandro

0 Ramsey over 8 years ago in reply to Alessandro Sanginario

TI__Genius 12025 points

Allesandro,

I would not be able to answer about the Sensor Controller. Maybe you can post your question to the Low Power RF Tools forum. This forum does not cover the Sensor Controller. Sorry.

~Ramsey

0 Kenia Guinto over 8 years ago in reply to Ramsey

TI__Expert 7250 points

There was a suggested answer and since there has been no active on this thread for more than a week, the suggested answer was marked as verify. Please feel free to select the "Reject Answer" button and reply with more details.

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TI-RTOS I2C Light Sensor Address