STA335BWS View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA335BWS

2.1 channels high efficiency digital audio system

STMicroelectronics 

Register description

STA335BWS

9. Read bottom 8-bits of coefficient b2 in I2C address 0x1C.

10. Read top 8-bits of coefficient a1 in I2C address 0x1D.

11. Read middle 8-bits of coefficient a1 in I2C address 0x1E.

12. Read bottom 8-bits of coefficient a1 in I2C address 0x1F.

13. Read top 8-bits of coefficient a2 in I2C address 0x20.

14. Read middle 8-bits of coefficient a2 in I2C address 0x21.

15. Read bottom 8-bits of coefficient a2 in I2C address 0x22.

16. Read top 8-bits of coefficient b0 in I2C address 0x23.

17. Read middle 8-bits of coefficient b0 in I2C address 0x24.

18. Read bottom 8-bits of coefficient b0 in I2C address 0x25.

Writing a single coefficient to RAM

1. Select the RAM block with register 0x31 bit1, bit0.

2. Write 6-bits of address to I2C register 0x16.

3. Write top 8-bits of coefficient in I2C address 0x17.

4. Write middle 8-bits of coefficient in I2C address 0x18.

5. Write bottom 8-bits of coefficient in I2C address 0x19.

6. Write 1 to W1 bit in I2C address 0x26.

Writing a set of coefficients to RAM

1. Select the RAM block with register 0x31 bit1, bit0.

2. Write 6-bits of starting address to I2C register 0x16.

3. Write top 8-bits of coefficient b1 in I2C address 0x17.

4. Write middle 8-bits of coefficient b1 in I2C address 0x18.

5. Write bottom 8-bits of coefficient b1 in I2C address 0x19.

6. Write top 8-bits of coefficient b2 in I2C address 0x1A.

7. Write middle 8-bits of coefficient b2 in I2C address 0x1B.

8. Write bottom 8-bits of coefficient b2 in I2C address 0x1C.

9. Write top 8-bits of coefficient a1 in I2C address 0x1D.

10. Write middle 8-bits of coefficient a1 in I2C address 0x1E.

11. Write bottom 8-bits of coefficient a1 in I2C address 0x1F.

12. Write top 8-bits of coefficient a2 in I2C address 0x20.

13. Write middle 8-bits of coefficient a2 in I2C address 0x21.

14. Write bottom 8-bits of coefficient a2 in I2C address 0x22.

15. Write top 8-bits of coefficient b0 in I2C address 0x23.

16. Write middle 8-bits of coefficient b0 in I2C address 0x24.

17. Write bottom 8-bits of coefficient b0 in I2C address 0x25.

18. Write 1 to WA bit in I2C address 0x26.

The mechanism for writing a set of coefficients to RAM provides a method of updating the

five coefficients corresponding to a given biquad (filter) simultaneously to avoid possible

unpleasant acoustic side-effects. When using this technique, the 6-bit address specifies the

address of the biquad b1 coefficient (for example, 0, 5, 10, 20, 35 decimal), and the

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