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DS90UB914 setting and I2C transmission

renhuang hsu
Prodigy 10 points

Hi TI, 

Can not to communicate between the 913 and the sensor with I2C
 use oscilloscope can't measure any signal

 Sensor : IMX104
 I2C address = 0x34

 1. The following 914 register settings correct?
 i2c read (0x00): 0xC0
 i2c read (0x06): 0xB0
 i2c read (0x07): 0xB2
 i2c read (0x08): 0x68
 i2c read (0x10): 0x6A
 i2c read (0x24): 0x08
 i2c read (0x40): 0x32
 i2c read (0x41): 0x32
 i2c read (0x03): 0xE9
 i2c read (0x21): 0x17

 2. Any register settings is omited?

3. I have to setting inital sensor, and read and write sensor register of 0x3000 ~ 0x305F
 write (8 bits) and read (8 bits)
where address I can write data to sensor register from 914?
and how can I get IMX104 register data ?

can you help?

  • 0
    TI__Genius 13475 points

    Renhuang

    I believe that in your system you have the IMX104 sensor with it's parallel output connected to the DS90UB913 Serializer, the I2C bus from the Serializer is connected to the I2C bus on the IMX104 sensor and you are trying to communicate with the Image Sensor from the controller, by passing the I2C commands through the DS90UB914, then to the 913, via the control channel, and then to the IMX104.

    Verify that you have I2C pass Through (in register 0x03) enabled.

    Have you verified that you are able to use the backchannel to communicate with the DS90UB913 from the DS90UB914?

    The first step in this debug should be to verify that the control channel is operating properly, which you can do by doing writes the 913 registers from the 914, and then verifying that the writes are being made ( depending on your design, you may want to configure one of the GPO pins and then use the registers to toggle the pin) 

    Have you read the application note 'I2C over DS90UB913/4 FPD-Link III with bidirectional control - SNLA222 - available here: http://www.ti.com/lit/an/snla222/snla222.pdf