MOSA

MS6865

3 Stereo inputs / 2W PA output with Volume Control

REV 1.0

16

www.mosanalog.com

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 MS6865 don’t detect a

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

OUTL-

OUTL+

100uF

1k

R

L

8Ω

OUTR-

OUTR+

100uF

1k

R

L

8Ω

SCL

SDA

100k

V

DD

Headphone Jack

HP_sense

MCU

MS6865

100k

1uF

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.

Thermal pad considerations

The thermal pad must be connected to ground. The package with thermal pad of the MS6865 requires the special

attention on thermal design. The thermal pad on the bottom of the MS6865 should be soldered down to a copper pad on

the circuit board. Heat can be conducted away from the thermal pad through the copper plane to ambient. If the copper

plane is not on the top surface of the circuit board, 9 vias of 13 mil or smaller in diameter should be used to thermally

couple the thermal pad to the bottom plane. For good thermal conduction, the vias must be plated through and solder

filled.