SN65DSI86: It is the first time to use this chip. Please review the schematic diagram . In addition, please confirm whether the chip needs to be programmed.

Dary

On the schematic review

1. One 10uF on EDP_1V2  is sufficient, you can replace the other 10uF capacitor to a 0.1uF capacitor.

2. One 10uF on EDP_1V2_VCCA  is sufficient, you can replace the other 10uF capacitor to a 0.1uF capacitor.

3. EN is driven by an external logic, please make sure the power-up timing in Figure 2 of the DSI86 datasheet is followed.

4. Do you have pullup resistor in I2C2_SCL and I2C2_SDA?

5. When a GPIO is pulled-up, it should be pulled-up to the VCCIO supply. Unused GPIOs should be pulled-down or tied to GND.

6. Please have the option on TEST2 to be pulled high to VCCIO if needed.

Please refer to the DSI86 programming guide app note on how to program the DSI86 I2C register: http://www.ti.com/lit/an/slla425/slla425.pdf.

Please also accept my friendship request so I can send you a spreadsheet that will automatically calculate the programmed value base on the input value.

Thanks

David