MS6865
MOSA
3 Stereo inputs / 2W PA output with Volume Control
In the SE mode, the amplifiers A2 and B2 are shutdown, and become the high output impedance states.
Headphone
Jack
A1
ꢀ1
100uF
1k
OUTRꢀ
RL
16Ω / 32Ω
A2
Shu1tdown
B1
ꢀ1
100uF
1k
OUTLꢀ
B2
Shu1tdown
I2C
Interface
SCL SDA
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 plugꢀin
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:
The HP_sense pin is high when a headphone is plugꢀin.
The HP_sense pin is low when a headphone is not plugꢀin.
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.
REV 2
17/22
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