TAS3251: Level Meter Feature

Hello customer,

Please refer to page 61 of the datasheet: http://www.ti.com/lit/ds/symlink/tas3251.pdf

Further, DSP memory map can be found on page 46 of  

Regards,

Alix Wan.

Hi,

We need to do some internal checking. Will update with you later. Thanks!

Regards,

Hao

Hi,

Sorry for missing the information on datasheet. Please try below,

PAGE 0C, Address 0x54 for Left output, Address 0x58 for Right. Data format is 4 byte /1.31.

Default value is 0x00000000.

Regards,

Hao

Hello Zhang-san,

Thank you for your reply.
I have some additional questions.

1) Please tell me the book address for left output and right output.
   I tried BOOK 0x8C with TAS3251EVM, but the correct data was not read.

2) "The BypassTo Level Meter Bit in Book 8C, Page 0x21, Register 0x70" is written on the data sheet.
  The same address exists in “Table 8. DSP Memory Map for Process Flow 2 — Book 0x8C” of SLAA799A".

   What is the correct address for Level Meter Input Mux?

3) Please tell me the address of Softening Filter Alpha.
   The address of TAS5825M is the address shown in the figure below. (Please refer)

Best Regards,
Hiroaki Masumoto

Hi Masumoto-san,

Let me make a summary for you,

Level Meter Left Output:

Book 0x78, PAGE 0x0C, Address 0x54. 4 byte /1.31 format. Default value 0x00000000.

Level Meter Right Output:

Book 0x78, PAGE 0x0C, Address 0x58. 4 byte /1.31 format. Default value 0x00000000.

Level Meter Alpha:

Book 0x8C, PAGE 0x20, Address 0x64. 4 byte /1.31 format. Default value 0x00A7264A.

Level Meter Input Mux:

Book 0x8C, PAGE 0x21, Address 0x70. 4 byte /32.0 format. Default value 0x00000000. 

Regards,

Hao

Hi Zhang-san,

Thank you for your quick reply.

I checked your summary using TAS3251EVM and PPC3 software.
conditions: Process Flow 1 - Default configuration, 1kHz -6dB sinwave input from USB port,
                  SDOUT Origin - Post (Monitor waveform with oscilloscope)

<Direct I2C>

w 94 00 00
w 94 7f 8c # Book 0x8c
w 94 00 20 # Page 0x20
r 94 64 04 # Read Level Meter Alpha
w 94 00 00
w 94 7f 8c # Book 0x8c
w 94 00 21 # Page 0x21
r 94 70 04 # Read Level Meter Input Mux
w 94 00 00
w 94 7f 78 # Book 0x78
w 94 00 0c # Page 0x0c
r 94 54 08 # Read Level Meter Left & Right Outputs

<Result>

# Read Level Meter Alpha : Different from Default value.
# Read Level Meter Input Mux : Different from Default value.
# Read Level Meter Left & Right Outputs : Although read several times, the value hardly changes and always a small value is read.

Is there a mistake in my verification method?

Best Regards,
Hiroaki Masumoto

Hi,

Please leave me some time to do some internal data checking. I will also run a test on EVM.

Thanks!

Regards,

Hao

Hi Zhang-san,

I am looking forward to hearing from you.
Thank you in advance.

Best Regards,
Hiroaki Masumoto

Hi Zhang-san,

Thank you for checking the internal data.

I understand that TAS3251 does not support the level meter function.

I will give this information to customers.

Best Regards,
Hiroaki Masumoto