SN65DSI86：AUx backlight control

chen sibo

Part Number: SN65DSI86

The backlight is controlled through the aux channel of the chip, which register should be read and written, and how to achieve the backlight control

over 2 years ago

0 Zach Dryer over 2 years ago

TI__Genius 13310 points

Hey Chen,

The registers 0xA0h - 0xA5h should be written to for backlight control.

Please see Table 27. CSR Bit Field Definitions—PWM Registers of the data sheet you will find that information.

Thanks,

Zach

0 chen sibo over 2 years ago in reply to Zach Dryer

Prodigy 110 points

Hi Dryer

Are there use cases to use aux's pwm?
We want to use the android system to achieve aux control pwm, at the same time can read back and write registers

Thanks

0 Zach Dryer over 2 years ago in reply to chen sibo

TI__Genius 13310 points

Hey Chen,

There is I2C over AUX capability as talked about in section 8.4.5.3 I2C-Over-AUX of the datasheet.

Thanks,

Zach

0 chen sibo over 2 years ago in reply to Zach Dryer

Prodigy 110 points

Hi Drye

I didn't see how to control pwm through i2c in section 8.4.5.3. Do you have the code used before, the code of the successful case? Or have a more detailed introduction

Thanks

0 Zach Dryer over 2 years ago in reply to chen sibo

TI__Genius 13310 points

Chen,

The registers 0xA0h - 0xA5h should be written to for backlight control.

Please see Table 27. CSR Bit Field Definitions—PWM Registers of the data sheet you will find that information.

With these registers in mind, then you can use I2C over AUX capability as talked about in section 8.4.5.3 I2C-Over-AUX of the datasheet.

Thus, you can write to the registers 0xA0h - 0xA5h while using I2C over AUX.

In this thread there is code on an example of using the Direct Method: https://e2e.ti.com/support/interface-group/interface/f/interface-forum/949449/sn65dsi86-i2c-over-aux-direct-method to R/W over AUX with I2C.

Thanks,

Zach

Interface

Interface forum

SN65DSI86：AUx backlight control