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Q: TAS5727 PBTL Register Settings
I am looking that the datasheet for the TAS5727 and trying to figure out the configuration for PBTL mode.
Specifically, I am unsure how to program the input multiplexer register 0x20. We are driving only one speaker, so the digital signal for that will come in on SDIN-L. This currently gets routed to channel1, but from the PWW output mux register setting, it actually multiplexes channels 1 and 2. So do I need to route SDIN-L to both channel1 and channel2? Then, in reg19 we put channels 1 and *3* to not belong to a shutdown group. Where does channel 3 come from? For some reason the datasheet doesn’t really explain these channel mappings at all.
It gives some values to set as follows:
"PWM output multiplexers should be updated to set the device in PBTL mode. Output Mux Register (0x25) should
be written with a value of 0x0110 3245. Also, the PWM shutdown register (0x19) should be written with a value"
Currently I have the following settings (not in the right order):
reg 0x05 = 0x00 (Unmute all channels not in a shutdown group)
reg 0x07 = 0x00 0xd8 (Master volume = -3dB)
reg 0x19 = 0x3a (as recommended above, Channels 1 and 3 don’t belong to shutdown group)
reg 0x1b = 0x00 (Default trim)
reg 0x20 = 0x00 0x01 0x77 0x72 (SDIN-L to channel1, SDIN-R to channel2)
reg 0x25 = 0x01 0x10 0x32 0x45 (as recommended above, channel2 to OUT_A, channel1 to OUT_B, channel2 to OUT_C, channel1 to OUT_D)
A: Re: TAS5727 PBTL Register Settings
I know the confusion because I was in the same boat! Here is the zip file that sets up the PBTL channel. I checked this with the TAS5727 EVM. The file names and comments are self-explanatory. Please let me know otherwise.
setting reg 0x25 = 0x01 0x10 0x32 0x45 recommended in datasheet is wrong
right value is 0x01 0x00 0x22 0x45
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