About the power consumption on TAS2521

Hello,

As additional customer information,

I will attach 2 files.

(1) Power consumption table by customer target board.

･Power consumption in table -> AVDD+DVDD (total), AVDD=DVDD=1.8V

･Transition Standby Mode -> 3 blocks(blow) are powered down. (Same as verification with our TAS 2521 EVM.)

PLL block: Page 0,Adr 0x05, D7bit:0

DAC block: Page0,Adr 0x3F, D7bit:0

SPK-amp block: Page1,Adr 0x2D, D1bit:0

(Master Reference is not powered down at standby mode.)

(2) Register Script file for Fs192KHz/48KHz

It is used for customer and it’s same as our using register Script.

Regards,

Tao_2199

Current consumption by customer target board.xlsx

{0x00, 0x00},	// Page switch to Page 0
{0x01, 0x01},	// Assert Software reset
{0x00, 0x01},	// Page Switch to Page 1
{0x02, 0x00},	// *LDO output programmed as 1.8V and Level shifters powered up
{0x00, 0x00},	// Page switch to Page 0
{0x04, 0x03},	// PLL_clkin = MCLK, codec_clkin=PLL_CLK  (MCLK: 36.8MHz(768fs))
{0x05, 0x91},	// *Power up PLL @192KHz (P=1, R=1)  (P=2, R=1,J=4,D=6748 @48K)
{0x06, 0x04},	// Set J=4
{0x07, 0x1A},	// D=6748
{0x08, 0x5C}	// D=6748
{0x0B, 0x81},	// *DAC NDAC powered up, NDAC=1  (NDAC=2@48K)
{0x0C, 0x87},	// *DAC MDAC powered up, MDAC=7 (MDAC=7@48K)
{0x0D, 0x00},	// DAC OSR(9:0)-> DOSR=128 ( DOSR=128 @48K)
{0x0E, 0x80},	// DAC OSR(9:0)-> DOSR=128
{0x1B, 0x20},	// Codec Interface control word length = 24bits, BCLK&WCLK inputs, I2S mode
{0x1C, 0x00},
{0x3C, 0x02},
{0x00, 0x01},	// Page Switch to Page 1
{0x01, 0x10},	// *Master Reference Powered on
{0x0A, 0x00},
{0x0C, 0x00},	// Mixer P output is not connected to HP Out Mixer
{0x16, 0x00},	// HP Volume, 0dB Gain
{0x18, 0x00},
{0x09, 0x00},	// *Power down HP and AINL/R disabled
{0x10, 0x40},	// Mute HP with 0dB gain
{0x30, 0x20},	// Speaker Volume Control 2 (12dB)
{0x2D, 0x02},	// *SPK output driver is powered up
{0x00, 0x00},	// Page switch to Page 0
{0x3F, 0xB0},	// *DAC powered up & Mono
{0x40, 0x04},	// Unmute DAC Channel
{0x41, 0xFB},	// DAC Channel Digital Volume Control
{0x00, 0x01},	// Page switch to Page 1 (for Speaker Volume Control)
{0x2E, 0x12},	// Speaker Volume Control 1 

Hello Ivan,

Thank you for confirmation and good advice.

Today I have confirmed power consumption with the sequence from you and confirmed to improve consumption.

(The consumption is back to normal.)

And I will inform this sequence to may customer soon.

In this case, I think that the important point is that how HOST will know audio streaming stop.

Because their application is optional board for mobile equipment and HOST of this application will not control all system.

Anyway, I will ask to customer that whether this sequence can be available on their application.

I have two questions.

(1) If only DAC is powered down, is RESET unnecessary for recovery?

I have been understanding to need RESET. I will ask about that just in case.

(2) You mentioned that there must be something in the processing that remains active after audio streaming stop.

Could you please tell me about this in more detail?

I need to explain to them the root cause of difference in power consumption.

Regards,

Tao_2199

Hello Ivan,

About my last several questions about power consumption by the DAC,

and the standby current consumption by POR register . (Following items.)

(1) If only DAC is powered down, is RESET unnecessary for recovery

I have been understanding to need RESET. I will ask about that just in case.

(2) You mentioned that there must be something in the processing that remains active after audio streaming stop.

Could you please tell me about this in more detail?

(3) I confirmed that the current of AVDD can be reduced by Master Reference powered down at standby mode.

Is there any problem for using at standby mode?

(I understand that this setting(powered down) is used for shutdown mode.)

Would you let me know current status of my questions?

I need to explain to them the root cause of difference in power consumption soon.

Regards,

Tao_2199

Hello Ivan,

Thank you for replay.

I informed to my customer your opinion of the difference in power consumption.

About Master Reference,

I will power down it while the device is in standby mode

Is there any problem for using in this mode?

Regards,

Tao_2199