We would like to use I2C address "7A" of ADV7513.
But our system is unstable I2C address. Sometimes it become I2C address "72".
Our sequence and condition.
PD/AD pin :Pull High 3.3V -> power on ADV7513 -> wait 200mese -> communicate with ADV7513 via I2C.
We refered "ADV7513_Hardware_User_Guide.pdf", section 6.6.1.
Maybe our sequence is no problem.
Please advise us what other point we check about I2C address setting.
Normally we recommend 5 ms wait after full power up sequence before using it as a PD pin. Assuming PD/AD is low during power up sequence then the PD pin will be active high. The PD pin is OR'd with the register PD bit for the actual power down signal. When PD is activated the chip will enter the power down state almost immediately, ( no timing available but very fast).
Releasing PD will require I2C operations to reconfigure the registers listed in the Table 74 of the programming guide.
Thank you for you reply.
We use "High" of PD/AD pin during power up sequence. Therefore we think that ADV7513 I2C address sets 7A, no power down mode as your answer.
But our PCBA is unstable of I2C address.
We did the additional test as follows.
PD/AD pin :Pull High 3.3V -> power on ADV7513 -> power reset(shut down) -> re-power on ADV7513
This test result, I2C address is stable. It is improved.
We think that the power sequence has any limitation when using I2C address "7A".
Could you please advise us this phenomenon?
Please make sure with below things,
The Power Down / Address (PD/AD) input pin can be connected to GND or AVDD (through a 2KΩ (+/-10%) resistor or a control signal. The device address and power down polarity are set by the state of the PD/AD pin when the ADV7513 supplies are applied.If the PD/AD pin is high (when the supplies are turned on), the device address will be 0x7A and the power down will be active low.Please crosscheck power down bit in register 0x42,whether it is active low or high.
And also crosscheck whether device in power up state by writing 0x41 = 0 .
Thank you for your comment.
We are checking around power schematics of ADV7513.
Maybe other LSI line power affect with ADV7513 power line.
Therefor we understood that it is no problme to set the sequence ADV7513.