CC2640R2F: 4x4mm Package: Cannot set pins 3 and 4 as I2C at Sensor Controller?

Markel Robregado

Part Number: CC2640R2F

Hi,

I am trying to set pins 3 and 4 as I2C at Sensor Controller but there is no option. Is there a way to make these pins available to be selected as I2C pins?

-kel

over 3 years ago

0 TER over 3 years ago

TI__Guru**** 317180 points

See table 4.4 in the datashhet: https://www.ti.com/lit/ds/symlink/cc2640r2f.pdf. DIO3 and DIO4 is not available from the Sensor Controller.

0 Markel Robregado over 3 years ago in reply to TER

Guru 85655 points

Yes, I saw that. I will just set pin 3 and pin 4 as I2C pins through the application.

Pin 3 and Pin 4 are not connected to JTAG_TDO and JTAG_TDI, I don't get the logic why it can not be set as I2C pins at Sensor Controller.

-kel

0 Markel Robregado over 3 years ago in reply to Markel Robregado

Guru 85655 points

Hi TER,

I set DIO3 and DIO4 as I2C pins at board file for the CC2640R2F 4x4. Then I am able to call I2C_open() and return with a valid handle.

But, from what you know, would there be any problem using DIO3 and DIO4 as I2C, since based from datasheet TDO and TDI should be connected to these pins?

-kel

0 TER over 3 years ago in reply to Markel Robregado

TI__Guru**** 317180 points

The pins are only used as TDO/ TDI if explicitly setting the chip to use 4-pin JTAG. The default is 2 pin JTAG and hence you can use DIO3/ DIO4 as a DIO the same way you use the other DIOs.

0 Markel Robregado over 3 years ago in reply to TER

Guru 85655 points

Thanks. I understood what you said after reading it 3x.

-kel

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CC2640R2F: 4x4mm Package: Cannot set pins 3 and 4 as I2C at Sensor Controller?