MOSA

MS6864

Dual 2W Power Amplifiers with Volume Control

REV 2

13/21

www.mosanalog.com

OPERATION PROCEDURE

The sequence of operation: power on→ active → power down → active → power off. The basic flowcharts are as

follows:

For HP mode and HP/BTL mode

Volume Down To Mute

Input Channels Mute On

[ Attenuation and Mute ]

Code: Lch 00111111 (3Fh)

Rch 01111111 (7Fh)

Power Off

Power Off

Power On

Power On

Activating

Power Down

(Shut Down)

All The Digital Interface Signals

Pull Low

I2C pull low

Power Down Preparation

[ Power Down Mode ]

Code: 11010010 (D2h)

[ Disable Input & Gain = 0dB]

Code: Lch 10000011 (83h)

Rch 10100011 (a3h)

wait 7 sec

Power Down All The Devices

Pull Down CAP Pin To Ground

[ Power Down Mode ]

Code: 11011111 (DFh)

Keep All The Digital Interface

Signals Unchanged

All the Digital Interface Signals

Pull Low

I2C pull low

Disable Power Down

[ Power Down Mode ]

Code: 11010011 (D3h)

Wait 0.5 sec

Setting Input Gain Is Fixed

[ Enable Input & Input Gain ]

Code: Lch 100xxx00

Rch 101xxx00

CAPPD = 0

[ Power Down Mode ]

Code: 11010010 (D2h)

Wait 0.5 sec

Default Status

[Attenuation & Mute]

Mute on (max attenuation)

[ Input Gain ]

0dB

[ Power Down Mode ]

All are power down status

[ Output Mode]

BTL mode

Power Down All The Devices

Only CAPPD Keep Activating

[ Power Down Mode ]

Code: 11011110 (DEh)

Volume Down To Mute

Input Channels Mute On

[ Attenuation and Mute ]

Code: Lch 00111111 (3Fh)

Rch 01111111 (7Fh)

PDPR = 0

[ Power Down Mode ]

Code: 11010000 (D0h)

Wait 0.5 sec

Mute Off And Volume Up/Down

Step By Step

[ Attenuation and Mute ]

Code: Lch 00xxxxxx

Rch 01xxxxxx

Power Down Preparation

[ Power Down Mode ]

Code: 11010010 (D2h)

[ Disable Input & Gain = 0dB]

Code: Lch 10000011 (83h)

Rch 10100011 (a3h)

wait 7 sec