MOSA

MS6258

Gain And Attenuation Volume Controller IC

REV 1

9

www.mosanalog.com.tw

Example

Mute off

The initial condition is –79dB and mute on when power on. The first command must disable the mute function.

Data byte

1

000

00

MSB

10

ACK

Start

0

111

00

10

MS6258 address

2-ch, Mute off

LSB

Stop

ACK

Set gain of 2 channel at 0dB, and selected stereo 1 input.

ACK

Stop

11

00

00

00

2-ch, +1dB/step, 0dB

ACK

Start

MS6258 Address

ACK

1110

00

00

2-ch, -10dB/step, 0dB

110

1

0

0

00

ACK

2-ch, -1dB/step, 0dB

0100

0

00

ACK

Stereo 1 input

0

Set gain of 2 channel at 6dB, and selected stereo 2 input.

The value of attenuation must be set zero when the volume from attenuation to gain.

ACK

Stop

11

00

10

01

2-ch, +1dB/step, 6dB

ACK

Start

MS6258 Address

ACK

1110

00

00

2-ch, -10dB/step, 0dB

110

1

0

0

00

ACK

2-ch, -1dB/step, 0dB

ACK

0100

0

00

1

Stereo 2 input

Set gain of 2 channel at -3dB, and selected stereo 3 input.

The value of gain must be set zero when the volume from gain to attenuation.

ACK

Start

MS6258 Address

ACK

1100

00

00

2-ch, +1dB/step, 0dB

111

0

0

0

00

ACK

2-ch, -10dB/step, 0dB

ACK

11

01

11

00

2-ch, -1dB/step, -3dB

ACK

Stop

0100

1

00

0

Stereo 3 input

Set attenuation of left channel at –33dB, and selected stereo 3 input.

ACK

Start

MS6258 Address

ACK

1011

11

00

L-ch, -10dB/step, -30dB

101

0

1

1

00

ACK

L-ch, -1dB/step, -3dB

ACK

11

01

11

00

Stereo 4 input

Stop