TAS2505EVM: Wrong LDO Output Voltage

Jiahe Liu

Part Number: TAS2505EVM
Other Parts Discussed in Thread: TAS2505

Tool/software:

Hello, when I was using TAS2505, I noticed the 1.8V output port from the LDO produces about 2.7V if I connect the board via USB or provide a 5V voltage externally, and 2.7V is beyond the recommended maximum voltage (1.95V) specified on the datasheet for AVDD and DVDD. I was wondering if it is still ok to continue using 2.7V for AVDD and DVDD in this case, or if there's any workarounds.

Thank you!

over 1 year ago

0 Ivan Salazar over 1 year ago

TI__Guru** 112555 points

Hi Jiahe,

Can you specify the jumper settings on the EVM? Do you mean that the on-board LDO outputs more voltage than 1.8V for DVDD and AVDD?
The device may tolerate a higher voltage, but it's not recommended to go beyond the maximum ratings specified in the data sheet.

Best regards,
-Ivan Salazar
Applications Engineer

0 Jiahe Liu over 1 year ago in reply to Ivan Salazar

Prodigy 110 points

Thanks for your reply! I did some experiments and found out that even after taking out the 1.8V LDO from the EVM, the 1.8V port still outputs 2.7V. For some reason, after soldering the LDO on again, the 1.8V port outputs 4.7V now, which is very weird. I was wondering if it is an issue with I2C setting, so I attached the readings of my registers on pages 0 and 1 as well:

Fullscreen tas2505_registers_page0.txt Download

addr, addr, data, data, 7, 6, 5, 4, 3, 2, 1, 0, description


0,    0x00, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Page Select Register



1,    0x01, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Software Reset Register



2,    0x02, 16,   0x10, 0, 0, 0, 1, 0, 0, 0, 0,  reserved


3,    0x03, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


4,    0x04, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Clock Setting Register 1, Multiplexers



5,    0x05, 17,   0x11, 0, 0, 0, 1, 0, 0, 0, 1,  Clock Setting Register 2, PLL P&R Values



6,    0x06, 4,    0x04, 0, 0, 0, 0, 0, 1, 0, 0,  Clock Setting Register 3, PLL J Values



7,    0x07, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Clock Setting Register 4, PLL D Values (MSB)



8,    0x08, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Clock Setting Register 5, PLL D Values (LSB)



9,    0x09, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


10,   0x0A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


11,   0x0B, 1,    0x01, 0, 0, 0, 0, 0, 0, 0, 1,  Clock Setting Register 6, NDAC Values



12,   0x0C, 1,    0x01, 0, 0, 0, 0, 0, 0, 0, 1,  Clock Setting Register 7, MDAC Values



13,   0x0D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  DAC OSR Setting Register 1, MSB Value



14,   0x0E, 128,  0x80, 1, 0, 0, 0, 0, 0, 0, 0,  DAC OSR Setting Register 2, LSB Value



15,   0x0F, 2,    0x02, 0, 0, 0, 0, 0, 0, 1, 0,  miniDSP_D Instruction Control Register 1



16,   0x10, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  miniDSP_D Instruction Control Register 2



17,   0x11, 8,    0x08, 0, 0, 0, 0, 1, 0, 0, 0,  miniDSP_D Interpolation Factor Setting Register



18,   0x12, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


19,   0x13, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


20,   0x14, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


21,   0x15, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


22,   0x16, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


23,   0x17, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


24,   0x18, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


25,   0x19, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Clock Setting Register 10, Multiplexers



26,   0x1A, 1,    0x01, 0, 0, 0, 0, 0, 0, 0, 1,  Clock Setting Register 11, CLKOUT M divider value



27,   0x1B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Audio Interface Setting Register 1



28,   0x1C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Audio Interface Setting Register 2


29,   0x1D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Audio Interface Setting Register 3



30,   0x1E, 1,    0x01, 0, 0, 0, 0, 0, 0, 0, 1,  Clock Setting Register 12, BCLK N Divider



31,   0x1F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Audio Interface Setting Register 4, Secondary Audio Interface



32,   0x20, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Audio Interface Setting Register 5



33,   0x21, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Audio Interface Setting Register 6



34,   0x22, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Digital Interface Misc. Setting Register



35,   0x23, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


36,   0x24, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


37,   0x25, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  DAC Flag Register 1



38,   0x26, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  DAC Flag Register 2



39,   0x27, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


40,   0x28, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


41,   0x29, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


42,   0x2A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Sticky Flag Register 1



43,   0x2B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Interrupt Flag Register 1



44,   0x2C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Sticky Flag Register 2



45,   0x2D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Sticky Flag Register 3



46,   0x2E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Interrupt Flag Register 2



47,   0x2F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Interrupt Flag Register 3



48,   0x30, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  INT1 Interrupt Control Register



49,   0x31, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  INT2 Interrupt Control Register



50,   0x32, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


51,   0x33, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


52,   0x34, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  GPIO/DOUT Control Register



53,   0x35, 18,   0x12, 0, 0, 0, 1, 0, 0, 1, 0,  DOUT Function Control Register



54,   0x36, 3,    0x03, 0, 0, 0, 0, 0, 0, 1, 1,  DIN Function Control Register



55,   0x37, 2,    0x02, 0, 0, 0, 0, 0, 0, 1, 0,  MISO Function Control Register



56,   0x38, 2,    0x02, 0, 0, 0, 0, 0, 0, 1, 0,  SCLK/DMDIN2 Function Control Register



57,   0x39, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


58,   0x3A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


59,   0x3B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


60,   0x3C, 1,    0x01, 0, 0, 0, 0, 0, 0, 0, 1,  DAC Signal Processing Block Control Register



61,   0x3D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


62,   0x3E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  miniDSP_D Configuration Register



63,   0x3F, 20,   0x14, 0, 0, 0, 1, 0, 1, 0, 0,  DAC Channel Setup Register 1



64,   0x40, 12,   0x0C, 0, 0, 0, 0, 1, 1, 0, 0,  DAC Channel Setup Register 2



65,   0x41, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Left DAC Channel Digital Volume Control Register



66,   0x42, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Right DAC Channel Digital Volume Control Register



67,   0x43, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


68,   0x44, 111,  0x6F, 0, 1, 1, 0, 1, 1, 1, 1,  reserved


69,   0x45, 56,   0x38, 0, 0, 1, 1, 1, 0, 0, 0,  reserved


70,   0x46, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


71,   0x47, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Beep Generator Register 1



72,   0x48, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


73,   0x49, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Beep Generator Register 3



74,   0x4A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Beep Generator Register 4



75,   0x4B, 238,  0xEE, 1, 1, 1, 0, 1, 1, 1, 0,  Beep Generator Register 5



76,   0x4C, 16,   0x10, 0, 0, 0, 1, 0, 0, 0, 0,  Beep Generator Register 6



77,   0x4D, 216,  0xD8, 1, 1, 0, 1, 1, 0, 0, 0,  Beep Generator Register 7



78,   0x4E, 126,  0x7E, 0, 1, 1, 1, 1, 1, 1, 0,  Beep Generator Register 8



79,   0x4F, 227,  0xE3, 1, 1, 1, 0, 0, 0, 1, 1,  Beep Generator Register 9



80,   0x50, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


81,   0x51, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Dig_Mic Control Register



82,   0x52, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


83,   0x53, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


84,   0x54, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


85,   0x55, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


86,   0x56, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


87,   0x57, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


88,   0x58, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


89,   0x59, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


90,   0x5A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


91,   0x5B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


92,   0x5C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


93,   0x5D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


94,   0x5E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


95,   0x5F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


96,   0x60, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


97,   0x61, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


98,   0x62, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


99,   0x63, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


100,  0x64, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


101,  0x65, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


102,  0x66, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


103,  0x67, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


104,  0x68, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


105,  0x69, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


106,  0x6A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


107,  0x6B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


108,  0x6C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


109,  0x6D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


110,  0x6E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


111,  0x6F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


112,  0x70, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


113,  0x71, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


114,  0x72, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


115,  0x73, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


116,  0x74, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


117,  0x75, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


118,  0x76, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


119,  0x77, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


120,  0x78, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


121,  0x79, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


122,  0x7A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


123,  0x7B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


124,  0x7C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


125,  0x7D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


126,  0x7E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


127,  0x7F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved

Fullscreen tas2505_registers_page1.txt Download

addr, addr, data, data, 7, 6, 5, 4, 3, 2, 1, 0, description


0,    0x00, 1,    0x01, 0, 0, 0, 0, 0, 0, 0, 1,  Page Select Register



1,    0x01, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  REF, POR & LDO BGAP Control Register



2,    0x02, 12,   0x0C, 0, 0, 0, 0, 1, 1, 0, 0,  LDO Control Register



3,    0x03, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Playback Configuration Register 1



4,    0x04, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Playback Configuration Register 2



5,    0x05, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  DAC DEM Control



6,    0x06, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


7,    0x07, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


8,    0x08, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Common Mode Register



9,    0x09, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Output Driver, AINL, AINR, Control Register



10,   0x0A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Common Mode Control Register



11,   0x0B, 16,   0x10, 0, 0, 0, 1, 0, 0, 0, 0,  HP Over Current Protection Configuration Register



12,   0x0C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  HP Routing Selection Register



13,   0x0D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


14,   0x0E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


15,   0x0F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


16,   0x10, 64,   0x40, 0, 1, 0, 0, 0, 0, 0, 0,  HP Driver Gain Setting Register



17,   0x11, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


18,   0x12, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


19,   0x13, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


20,   0x14, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Headphone Driver Startup Control Register



21,   0x15, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


22,   0x16, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  HP Volume Control Register



23,   0x17, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


24,   0x18, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  AINL Volume Control Register



25,   0x19, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  AINR Volume Control Register



26,   0x1A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


27,   0x1B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


28,   0x1C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


29,   0x1D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


30,   0x1E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


31,   0x1F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


32,   0x20, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


33,   0x21, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


34,   0x22, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


35,   0x23, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


36,   0x24, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


37,   0x25, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


38,   0x26, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


39,   0x27, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


40,   0x28, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


41,   0x29, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


42,   0x2A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


43,   0x2B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


44,   0x2C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


45,   0x2D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Speaker Amplifier Control 1



46,   0x2E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Speaker Volume Control 1



47,   0x2F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


48,   0x30, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Speaker Amplifier Volume Control 2



49,   0x31, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


50,   0x32, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


51,   0x33, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


52,   0x34, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


53,   0x35, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


54,   0x36, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


55,   0x37, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


56,   0x38, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


57,   0x39, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


58,   0x3A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


59,   0x3B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


60,   0x3C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


61,   0x3D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


62,   0x3E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


63,   0x3F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  DAC Analog Gain Control Flag Register



64,   0x40, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


65,   0x41, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


66,   0x42, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


67,   0x43, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


68,   0x44, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


69,   0x45, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


70,   0x46, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


71,   0x47, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


72,   0x48, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


73,   0x49, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


74,   0x4A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


75,   0x4B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


76,   0x4C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


77,   0x4D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


78,   0x4E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


79,   0x4F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


80,   0x50, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


81,   0x51, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


82,   0x52, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


83,   0x53, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


84,   0x54, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


85,   0x55, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


86,   0x56, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


87,   0x57, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


88,   0x58, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


89,   0x59, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


90,   0x5A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


91,   0x5B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


92,   0x5C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


93,   0x5D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


94,   0x5E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


95,   0x5F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


96,   0x60, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


97,   0x61, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


98,   0x62, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


99,   0x63, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


100,  0x64, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


101,  0x65, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


102,  0x66, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


103,  0x67, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


104,  0x68, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


105,  0x69, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


106,  0x6A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


107,  0x6B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


108,  0x6C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


109,  0x6D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


110,  0x6E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


111,  0x6F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


112,  0x70, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


113,  0x71, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


114,  0x72, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


115,  0x73, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


116,  0x74, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


117,  0x75, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


118,  0x76, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


119,  0x77, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


120,  0x78, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


121,  0x79, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


122,  0x7A, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  Reference Powerup Delay 



123,  0x7B, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


124,  0x7C, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


125,  0x7D, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


126,  0x7E, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved


127,  0x7F, 0,    0x00, 0, 0, 0, 0, 0, 0, 0, 0,  reserved

In any case, to answer your question, my jumper settings are the following:

- W1 (LDO_SEL) is connected to the ground

- W10, W11, W12, W14 are all connected

- W13 is connected to 3.3V

- voltage source selection is connected to USB

Here's also a picture which might help as well:

0 Ivan Salazar over 1 year ago in reply to Jiahe Liu

TI__Guru** 112555 points

Hi Jiahe,

Thanks for sharing more information, I'll go over this and get back to you within a couple of days.

Best regards,
-Ivan Salazar
Applications Engineer

0 Ivan Salazar over 1 year ago in reply to Ivan Salazar

TI__Guru** 112555 points

Hi Jiahe,

If I understand correctly, the problem is something on the EVM design rather than the internal LDO of TAS2505, correct?

In this case, registers setting should not have any effect. I'll run some tests with the EVM and come back with further comments by tomorrow.

Best regards,
-Ivan Salazar
Applications Engineer

Audio

Audio forum

TAS2505EVM: Wrong LDO Output Voltage