STA381BWSTR STMicroelectronics, STA381BWSTR Datasheet - Page 138

• Manufacturer Part Number: STA381BWSTR
• Description: Audio DSPs Sound Terminal 2.1 High EFF Dig Audio
• Manufacturer: STMicroelectronics

Specifications of STA381BWSTR

• Product Category: Audio DSPs
• Rohs: yes
• Operating Supply Voltage: 4.5 V to 25.5 V
• Operating Temperature Range: 0 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: VQFN-48
• Snr: 100 dB

Register description: Sound Terminal compatibility
138/171
Writing a set of coefficients to RAM
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Write the bottom 8 bits of coefficient a1 in I
11. Write the top 8 bits of coefficient a2 in I
12. Write the middle 8 bits of coefficient a2 in I
13. Write the bottom 8 bits of coefficient a2 in I
14. Write the top 8 bits of coefficient b0 in I
15. Write the middle 8 bits of coefficient b0 in I
16. Write the bottom 8 bits of coefficient b0 in I
17. Write 1 to the 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
STA381BWS generates the RAM addresses as offsets from this base value to write the
complete set of coefficient data.
Write 6 bits of the starting address to I
Write the top 8 bits of coefficient b1 in I
Write the middle 8 bits of coefficient b1 in I
Write the bottom 8 bits of coefficient b1 in I
Write the top 8 bits of coefficient b2 in I
Write the middle 8 bits of coefficient b2 in I
Write the bottom 8 bits of coefficient b2 in I
Write the top 8 bits of coefficient a1 in I
Write the middle 8 bits of coefficient a1 in I
2
Doc ID 018937 Rev 6
C address 0x26.
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.
STA381BWS