MOSA

MS6864

Dual 2W Power Amplifiers with Volume Control

REV 2

16/21

www.mosanalog.com

Output mode operation -- SE mode and BTL mode

The output has two modes, SE mode and BTL mode. The mode is selected by I2C code via MCU.

In BTL mode, the outputs of A1(B1) and A2(B2) are then used to drive the speakers(4Ω/8Ω).

OUTR+

OUTR-

OUTL+

OUTL-

-1

-1

-1

-1

SCL

SDA

Interface

R

L

4Ω / 8Ω

R

L

4Ω / 8Ω

A1

A2

B1

B2

In the SE mode, the amplifiers A2 and B2 are shutdown, and become the high output impedance states.

OUTR-

OUTL-

-1

-1

-1

-1

SCL

SDA

Interface

R

L

16Ω / 32Ω

100uF

1k

Headphone

Jack

Shutdown

Shutdown

100uF

1k

A1

A2

B1

B2

Headphone sense

The output mode is SE or BTL that is decided by a headphone. It has to be set SE mode when a headphone is plug-in

status. The output mode is selected by I2C command code by MCU. Please note that the MS6864 don’t detect a

headphone automatically. Thus a detect function is executed via MCU. An operation diagram is shown as follows:

The HP_sense pin is high when a headphone is plug-in.

The HP_sense pin is low when a headphone is not plug-in.