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Figure 3.13.2 Block diagram of digital circuit of audio front end
To communicate with the external Bluetooth module, the master-mode PCM interface and master-
mode I2S/EIAJ interface are supported. The clock of PCM interface is 256 kHz while the frame sync is 8
kHz. Both long sync and short sync interfaces are supported. The PCM interface can transmit 16-bit
stereo or 32-bit mono 8 kHz sampling rate voice signal. Figure 3.13.3 shows the timing diagram of the
PCM interface. Note that the serial data changes when the clock is rising and is latched when the clock is
falling.
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3. TECHNICAL BRIEF
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3. TECHNICAL BRIEF
LGE Internal Use Only
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