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KwikBlue4-1

Bluetooth® Class 1 BC04 Module

Manual

Document#: CONFIDENTIAL Revision 0.1

3.6 PCM

3.6.1 Features

The Bluetooth module implements an audio transcoder to translate between A-law, µ-law and

linear voice data from the host and A-l a w, µ-law and CVSD voice data over the air. Voice

interpolation for lost packets is also included. PCM_OUT, PCM_IN, PCM_CLK and

PCM_SYNC carry up to three bi-directional channels of voice data, each at 8 ks/s. The PCM

samples can be 8-bit A-law, 8-bit µ-law, 13-bit linear or 16-bit linear format. The PCM_CLK and

PCM_SYNC pins can be configured as inputs or outputs, depending on whether the Bluetooth

module is the master or slave of the PCM interface.

The PCM_SYNC operates at a fixed clock frequency of 8 KHz. When PCM_SYNC is operated

as an output (master mode) a clock frequency of 8 KHz is generated from this pin. When operated

as an input (slave mode) 8 KHz must be applied to this pin.

PCM_CLK operates at a fixed clock frequency of 256 KHz. When PCM_CLK is operated as an

output (master mode) a clock frequency of 256 KHz is generated from this pin. When operated as

an input (slave mode) 256 KHz must be input on this pin.

When used with the Motorola MC145483 PCM or compatible devices, bits 1 to 13 of the

PCM_OUT data carry the current output sample value. Bits 14 to 16 carry a three-bit signal level

value and these “level bits” vary the level of the audio signal output from the PCM device.

3.6.2 Recommended Codec IC

The Bluetooth module can be interfaced directly to the following PCM audio chips:



OKI MSM7705 four channel µ/A-law codec

 Motorola MC145481 8-bit µ/A-law codec



Motorola MC145483SD 13-bit linear codec



Mitel MT93LI6 Echo canceling codec

Figure 1: PCM Bus Transfer Definition

Dtmsb

5432

clksyn

PCM_ CL

1211 13 14

D3 D4 D5 D6 D7

D9 D10 D11 D12 D13

mc l

pw h

pw l

risel

fall

syncl

Dt13

Dtcl

PCM_ SY N

PCM_ OU

Hdsyn

Dval