GT-tronics HK Ltd BC5MMFPX Manual De Usuario

 

The above schematic shows a typical application of BC5MMFPB (C) module.  Double click on the diagram to see 

the detail drawings. 
 
Power supply 
 
 

The whole module shall be supplied with a clean 3.3v at its 3V3 power port (pin #9).  A coupling capacitor should 

be placed as close to this pin as possible.  All others PIO pins (including VREG), SPI programming port and UART port 
will run at this power rail. 
 
Differential Audio Outputs 
 

The output stage digital circuitry converts the signal from 16-bit per sample, linear PCM of variable sampling frequency to 

bit stream, which is fed into the analogue output circuitry. The output stage circuit comprises a DAC with gain setting and class AB 
output stage amplifier. The output is available as a differential signal between SPK_LN and SPK_LP for the left channel, as the 
schematic shows, and between SPK_RN and SPK_RP for the right channel. The output stage is capable of driving a speaker directly 
when its impedance is at least 8Ω. 

 
 

PCM Interface (BC5MMFPC only) 

 
The audio PCM interface supports continuous transmission and reception of PCM encoded audio data over Bluetooth. 

PCM is a standard method used to digitise audio, particularly voice, for transmission over digital communication channels. Through 

ts PCM interface, BlueCore5‑ Multimedia External has hardware support for continual transmission and reception of PCM data, 
so reducing processor overhead. BlueCore5‑ Multimedia External offers a bidirectional digital audio interface that routes directly 
into the baseband layer of the on-chip firmware. It does not pass through the HCI protocol layer. 

   

Hardware on BlueCore5‑ Multimedia External allows the data to be sent to and received from a SCO connection. Up to 3 

SCO connections can be supported by the PCM interface at any one time. BlueCore5‑ Multimedia External can operate as the PCM 
interface master generating PCM_SYNC and PCM_CLK or as a PCM interface slave accepting externally generated PCM_SYNC 
and PCM_CLK. BlueCore5‑ Multimedia External is compatible with various clock formats, including Long Frame Sync, Short 
Frame Sync and GCI timing environments. 

 

Host  Information  

 

This module was defined to be used for specific host only. The designated host for this module was: 

 

Company: GT-tronics HK Ltd. 

Address: B202, Tonic Industrial Center, 19 Lam Hing Street, Kowloon Bay, Hong Kong 

Host Model Name: BTSPK 

Host brand name: GT-tronics 

 

UART Port 
 

BC5MMFPB (C) has a standard UART serial interface that provides a simple mechanism for communicating with other 

serial devices using the RS232 protocol. When BC5MMFPB (C) is connected to another digital device, RX and TX transfer data 
between the 2 devices.  UART configuration parameters, such as baud rate and packet format, are set using 
BlueCore5‑ Multimedia External firmware. 

 

To communicate with the UART at its maximum data rate using a standard PC, an accelerated serial port adapter card is required for 
the PC. 

 

Possible UART Settings 

Baud rate 

Minimum 

1200 baud (≤2%Error) 

Maximum 

9600 baud (≤1%Error) 

Parity 

None, Odd or Even 

Number of stop bits 

1 or 2 

Bits per byte 

8 

 

 
SPI Programming Port 
 

The SPI is used to program and configuration, and debug the BlueCore5‑ Multimedia External.  It is required in production. 

Ensure the 4 SPI signals are brought out to either test points or a header.  Note that these four signals are run at 3.3v power rail. 
 
 
Mic Inputs 
 

The microphone bias, MIC_BIAS, derives its power from the 3V3 power port and requires a 4.7μF capacitor on its output. 

The MIC_BIAS is like any voltage regulator and requires a minimum load to maintain regulation. The MIC_BIAS maintains 
regulation within the limits 0.200mA to 1.230mA.  The input impedance at MIC_A_N, MIC_A_P, MIC_B_N and MIC_B_P is 
typically  6.0kΩ

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