DS90UB954-Q1: DS90UB943 I2C have no ack

Hello,

Are you having issue with SoC communication with 954 OR SoC communication with the imager?

If it's SoC communication with 954:
- What's your I2C pull-ups?
- What is the I2C address of the 954?
- The I2C address can be shown in 7-bit or 8-bit mode. Make sure you are using the right I2C address.
- Can you read reg 0x00 from the 954 and see what it gives back?



If it's the SoC communication with the imager:
- Did you set the alias correctly? If not, follow the instructions below:

-Des reg 0x4C: Select the right RX port to write
-Set/Check real I2C addresses:
-Reg 0x5B SER DEVICE ID: Set the real serializer I2C address. This is typically loaded already
-Reg 0x5D SlaveID[0]: Set the real CMOS sensor I2C address
-Reg 0x5C SER_ALIAS_ID: Set the alias serializer I2C address
-Reg 0x65 SLAVE_ALIAS_ID[0] (camera alias ID): Set the alias CMOS sensor I2C address

- Only communicate to the serializer using the alias address indicated in 0x5C (the address indicated in 0x5C is 8-bit)
- Only communicate to the imager using the alias address indicated in 0x65 (the address indicated in 0x65 is 8-bit)
- What is your I2C pull-ups?
- Is the imager initialized properly?
- Does the SoC support clock stretching? The SoC needs this feature to communicate to the imager.


Best,
Jiashow