STA323W datasheet(64/71 Pages) STMICROELECTRONICS

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User-programmable settings

STA323W

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8.6.17

Coefficient write control register (address 0x26)

Coefficients for EQ, Mix and Scaling are handled internally in the STA323W 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. The first register contains base address of the

coefficient: five sets of three registers store the values of the 24-bit coefficients to be written

or that were read, and one contains bits used to control the reading or writing of the

coefficients to RAM. The following are instructions for reading and writing coefficients.

8.7

Reading a coefficient from RAM

Write 8-bits of address to I2C register 0x16.

Write ‘1’ to bit R1 (D2) of I2C register 0x26.

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

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

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

8.8

Reading a set of coefficients from RAM

Write 8-bits of address to I2C register 0x16.

Write ‘1’ to bit RA (D3) of I2C register 0x26.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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