STA308A View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA308A' PDF : 63 Pages View PDF
STA308A
7.5
Writing a single coefficient to RAM
1. write top 2-bits of address to I2C register 0x3B
2. write bottom 8-bits of address to I2C register 0x3C
3. write top 8-bits of coefficient in I2C address 0x3D
4. write middle 8-bits of coefficient in I2C address 0x3E
5. write bottom 8-bits of coefficient in I2C address 0x3F
6. write 1 to W1 bit in I2C address 0x4C
Registers
7.6
Writing a set of coefficients to RAM
1. write top 2-bits of starting address to I2C register 0x3B
2. write bottom 8-bits of starting address to I2C register 0x3C
3. write top 8-bits of coefficient b1 in I2C address 0x3D
4. write middle 8-bits of coefficient b1 in I2C address 0x3E
5. write bottom 8-bits of coefficient b1 in I2C address 0x3F
6. write top 8-bits of coefficient b2 in I2C address 0x40
7. write middle 8-bits of coefficient b2 in I2C address 0x41
8. write bottom 8-bits of coefficient b2 in I2C address 0x42
9. write top 8-bits of coefficient a1 in I2C address 0x43
10. write middle 8-bits of coefficient a1 in I2C address 0x44
11. write bottom 8-bits of coefficient a1 in I2C address 0x45
12. write top 8-bits of coefficient a2 in I2C address 0x46
13. write middle 8-bits of coefficient a2 in I2C address 0x47
14. write bottom 8-bits of coefficient a2 in I2C address 0x48
15. write top 8-bits of coefficient b0 in I2C address 0x49
16. write middle 8-bits of coefficient b0 in I2C address 0x4A
17. write bottom 8-bits of coefficient b0 in I2C address 0x4B
18. write 1 to WA bit in I2C address 0x4C
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 10-bit address would specify the address of the biquad b1
coefficient (for example, decimals 0, 5, 10, 15, …, 100, … 395), and the STA308A will
generate the RAM addresses as offsets from this base value to write the complete set of
coefficient data.
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