A−1

Appendix A

Software Interface

REGISTER

ADDRESS

NO. OF

BYTES

BYTE DESCRIPTION

Reserved

00h

MCR

01h

1

C(7−0)

Reserved

02h

2

Reserved

Reserved

03h

Volume†

04h

6

VL(23−16), VL(15−8), VL(7−0), VR(23−16), VR(15−8), VR(7−0)

Treble

05h

1

T(7−0)

Bass

06h

1

B(7−0)

Mixer 1‡

07h

3

S(23−16), S(15−8), S(7−0)

Mixer 2‡

08h

3

S(23−16), S(15−8), S(7−0)

Reserved

09h

Left

Biquad 0

0Ah

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Left

Biquad 1‡

0Bh

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Left

Biquad 2‡

0Ch

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Left

Biquad 3‡

0Dh

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Left

Biquad 4‡

0Eh

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Left

Biquad 5‡

0Fh

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0) A2(23−16), A2(15−8), A2(7−0)

Reserved

10h−12h

Right

Biquad 0‡

13h

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Right

Biquad 1‡

14h

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Right

Biquad 2‡

15h

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Right

Biquad 3‡

16h

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Right

Biquad 4‡

17h

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Right

Biquad 5‡

18h

15

B0(23−16), B0(15−8), B0(7−0), B1(23−16), B1(15−8), B1(7−0), B2(23−16), B2(15−8), B2(7−0),

A1(23−16), A1(15−8), A1(7−0), A2(23−16), A2(15−8), A2(7−0)

Reserved

19h−FFh

† The volume value is a 4.16 coefficient. In order to transmit it over I2C, it is necessary to separate the value into three bytes. Byte 2 (MSB) is the

integer part and bytes 1 and 0 are the fractional part.

‡ The mixer gain values and biquad coefficients are 4.20 coefficients. In order to transmit them over I2C, it is necessary to separate the value into

three bytes. The first nibble of byte 2 (MSB) is the integer part; the second nibble of byte 2 and bytes 1 and 0 are the fractional part.