STA339BWS13TR STMicroelectronics, STA339BWS13TR Datasheet - Page 59

• Manufacturer Part Number: STA339BWS13TR
• Description: DIG AUDIO SYSTEM, 2-CH, 36POWERSSOP
• Manufacturer: STMicroelectronics

Specifications of STA339BWS13TR

• Svhc: No SVHC (15-Dec-2010)
• No. Of Pins: 36
• Operating Temperature Range: -20°C To +70°C
• Supply Voltage Max: 21.5V
• Supply Voltage Min: 4.5V
• Termination: RoHS Compliant
• Package / Case: PowerSSO
• Interface: I2C
• Interface Type: I2C
• Rohs Compliant: Yes

STA339BWS
Writing a set of coefficients to RAM
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Write middle 8-bits of coefficient a1 in I
11. Write bottom 8-bits of coefficient a1 in I
12. Write top 8-bits of coefficient a2 in I
13. Write middle 8-bits of coefficient a2 in I
14. Write bottom 8-bits of coefficient a2 in I
15. Write top 8-bits of coefficient b0 in I
16. Write middle 8-bits of coefficient b0 in I
17. Write bottom 8-bits of coefficient b0 in I
18. Write 1 to WA bit in I
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
STA339BWS generates the RAM addresses as offsets from this base value to write the
complete set of coefficient data.
Table 71.
0
1
2
3
4
5
…
19
20
21
…
39
(Decimal)
Index
Select the RAM block with register 0x31 bit1, bit0.
Write 6-bits of starting address to I
Write top 8-bits of coefficient b1 in I
Write middle 8-bits of coefficient b1 in I
Write bottom 8-bits of coefficient b1 in I
Write top 8-bits of coefficient b2 in I
Write middle 8-bits of coefficient b2 in I
Write bottom 8-bits of coefficient b2 in I
Write top 8-bits of coefficient a1 in I
RAM block for biquads, mixing, scaling, bass management
0x00
0x01
0x02
0x03
0x04
0x05
…
0x13
0x14
0x15
…
0x27
Index (Hex)
2
Channel 1 - Biquad 1
Channel 1 - Biquad 2
…
Channel 1 - Biquad 4
Channel 2 - Biquad 1
…
Channel 2 - Biquad 4
C address 0x26.
Doc ID 15276 Rev 3
Description
2
2
2
2
2
2
C register 0x16.
C address 0x17.
C address 0x1A.
C address 0x1D.
C address 0x20.
C address 0x23.
2
2
2
2
2
2
2
2
2
2
C address 0x18.
C address 0x1B.
C address 0x1E.
C address 0x21.
C address 0x24.
C address 0x19.
C address 0x1C.
C address 0x1F.
C address 0x22.
C address 0x25.
C1H10(b1/2)
C1H11(b2)
C1H12(a1/2)
C1H13(a2)
C1H14(b0/2)
C1H20
…
C1H44
C2H10
C2H11
…
C2H44
Coefficient
Register description
0x000000
0x000000
0x000000
0x000000
0x400000
0x000000
…
0x400000
0x000000
0x000000
…
0x400000
Default
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