TAS5806MD: Phase/Clock snychronization via I2S

Hello Luis,

why can I only sync 4 devices? If I use for example 5 TAS5805MD I could halt the I2S for all devices, configure the sync-register of 4 devices on the first i2c bus and 1 device on the second i2c bus, then restart the I2S for all of them. Is this assumption wrong if they all get the same I2S signal?

Also does the PWM output of the amplifier start with
1) always with a rising edge
2) or always with a falling edge
3) or same edge as LRCLK (if first edge of LRCLK is high -> first edge of output is also high)
4) or totaly random

Best regards,
Severin

Hello Severin,

I should clarify that was in regards to phase selection for the EMI improvement mitigation, but you should be able to sync all devices to the I2S bus

I2S halt and back is the trigger signal for multiple device PWM sync. So the sequence should be:

1. Initialize TAS5806MD by following startup sequence requirements.
2. After initialization,  refer multiple device PWM steps to halt I2S, configure I2C, then back I2S.

best regards,

Luis

Hello Luis,
 
thanks for your response! Could you also tell me you opinion on this question:

After syncing als amps together an setting them in play-mode again, does the PWM output of the amplifier start with
1) always with a rising edge
2) or always with a falling edge
3) or same edge as LRCLK (if first edge of LRCLK is high -> first edge of output is also high)
4) or totaly random

I am asking, because I could generate a clock from a microcontroller which is in sync to the output of the TAS5806MD. I could then use this clock to sync it to a buckconverter. I am also intersted in your opinion if this is even usefull.

best regards,
Severin

Hello Severin,

I will test this on bench and get back to you.

best regards,

Luis