STA309B datasheet(55/66 Pages) STMICROELECTRONICS

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STA309B

Registers

Doc ID 022570 Rev 2

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7.2.78

Coefficient write control register (0x4C)

Coefficients for EQ and bass management are handled internally in the STA309B via RAM.

Access to this RAM is available to the user via an I2C register interface.

A collection of I2C registers are dedicated to this function. One contains a coefficient base

address, five sets of three store the values of the 24-bit coefficients to be written or that were

read, and one contains bits used to control the write of the coefficient(s) to RAM. The

following are instructions for reading and writing coefficients.

7.3

Reading a coefficient from RAM

write top 2 bits of address to I2C register 0x3B

write bottom 8 bits of address to I2C register 0x3C

read top 8 bits of coefficient in I2C address 0x3D

read middle 8 bits of coefficient in I2C address 0x3E

read bottom 8 bits of coefficient in I2C address 0x3F

7.4

Reading a set of coefficients from RAM

write top 2 bits of address to I2C register 0x3B

write bottom 8 bits of address to I2C register 0x3C

read top 8 bits of coefficient in I2C address 0x3D

read middle 8 bits of coefficient in I2C address 0x3E

read bottom 8 bits of coefficient in I2C address 0x3F

read top 8 bits of coefficient b2 in I2C address 0x40

read middle 8 bits of coefficient b2 in I2C address 0x41

read bottom 8 bits of coefficient b2 in I2C address 0x42

read top 8 bits of coefficient a1 in I2C address 0x43

10. read middle 8 bits of coefficient a1 in I2C address 0x44

11. read bottom 8 bits of coefficient a1 in I2C address 0x45

12. read top 8 bits of coefficient a2 in I2C address 0x46

13. read middle 8 bits of coefficient a2 in I2C address 0x47

14. read bottom 8 bits of coefficient a2 in I2C address 0x48

15. read top 8 bits of coefficient b0 in I2C address 0x49

16. read middle 8 bits of coefficient b0 in I2C address 0x4A

17. read bottom 8 bits of coefficient b0 in I2C address 0x4B

STA309B Datasheet(PDF) 55 Page - STMicroelectronics