TAS2557: Power down and mute for 16khz tuning mode

Hi Viktor,

You mention you look at I2S and confirm its OK. Are you using a scope to measure BCLK and WCLK frequencies? What are their values?

You also mention using PPC3 to generate configuration files, but I would expect more command lines than the above. Are you using another set of commands for initialization and then these only for power up?

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

Hello Ivan,

Yes, I am using a scope and the values are BCLK: 512kHz, WCLK: 16kHz. I did use PPC3, but i could not find any sequence for power down/up among the configuration files. The command lines that I posted comes from the datasheet, plus a few commands provided by you to make the device generate BCLK and WCLK. The values of these commands are the same as in my initialization.

Where can i find a complete set of power up/down sequence? 

Thank you,
/Viktor

Hey Ivan, 

Have you considered my question about power up/down sequences?

/Viktor

Hi Viktor,

I would suggest that you generate a configuration file using PPC3, you can do this from End System Integration panel and should select your clock settings, although SBCLK lower than 1MHz is not supported.

Regarding power up and down commands, once the device is initialized, you can use these snippets from data sheet:

Power Up:

################### CHANNEL POWER UP ####################################################
w 98 05 A3 # Power up Analog Blocks
w 98 04 B8 # Power up DSP and clock dividers
w 98 07 00 # Unmute Analog Blocks
w 98 7f 64 # switch to book100
w 98 07 00 # Soft stepped unmute of audio playback ############################################################################################

Power Down:

################### CHANNEL POWER DOWN ####################################################
w 98 07 01 # Soft stepped mute of audio playback
d 10 # wait for DSP to mute classD after soft step down of audio
# instead of delay alternatively status flag B120_P15_R120_R121_R122_R123 polling can be done and wait till R122_D0 = '1'.
w 98 7f 00 # switch to book0
w 98 07 03 # Mute Analog Blocks
w 98 04 20 # Power down DSP and clock dividers (except Ndivider)
w 98 05 00 # Power down Analog Blocks
w 98 00 00 # NOP
w 98 04 00 # Power down Ndivider
#############################################################################################
#optional(ending the script in B0_P0) w 98 00 00 # page 0 w 98 7f 00 # book 0 #############################################################################################

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

Hi Ivan!

I have used PPC3 to generate my configurations, i only added the following section to set the device in "master mode", where TAS2557 will generate WCLK and BCLK:

{0x00, 0x00},
{0x7f, 0x00},
{0x00, 0x01},
{0x01, 0x00}, //I2S // 16-bit
{0x0d, 0x01}, //BDIV input = DAC_MOD_CLK
{0x0e, 0x86}, //BDIV enabled and set to 6
{0x0f, 0xA0}, //WDIV enabled and set to 32
{0x10, 0x00}, //ASI1 BCLK & WCLK from BDIV & WDIV
{0x3d, 0x0d}, //GPIO1 (BCLK) output from ASI1_BCLK_OUT
{0x3e, 0x0c} //GPIO2 (WCLK) output from ASI1_WCLK_OUT

I will provide you with my configuration file and maybe you can help me locate the power up/down sequence?

/Viktor7077.combined_configuration_0_TuningMode_16KHz.cfg