YangXL

ADV7611 i2c read error

Discussion created by YangXL on Mar 12, 2015
Latest reply on Mar 13, 2015 by YangXL

Dear all,
We have developped a board with a ADV7611.
The i2c addr is 0x98.
It seems that:
1.I can't write 0x98 0xFF 0x80 (to restart ADV7611).
  No Ack after the data.

wff.bmp
2.I can write any other register. example 0x98 0xF4 0x80.

wf4.bmp
3.I can't read any register,example 0x98 0xF4.
  No Ack after the i2c read addr.

rf4.bmp

I confirm below points:
1.i2c_clk i2c_data pull up to 3.3V with 2.2k resister.
2.ADV7611 running from an external 28.6363 MHz clock
3.the pad underneath the ADV7611 has connection to GND
4.use 400kbps,100kbps,50kbps,10kbps,the errors are same.
5.the CPU can communication to other i2c device well.

It's so strange.
Can someone help me?

Best,
Yang

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