Harman MB8811VMA User Manual

MB8811C1B is a Bluetooth Stereo module which can be used to design Bluetooth
speakers. Besides, MB8811C1B can be as a direct connection to any Bluetooth
mobile phone when designed into speakers and stereo headphones.

Host Controller Interface

- UART

This is a standard Universal Asynchronous Receiver Transmitter (UART)
interface for communicating with Host.

principle of operation with Microcontroller

The microcontroller (like BX8805), interrupt controller and event timer run the
Bluetooth software stack and control the radio and host interfaces. A 32 bit
ARM based microcontroller is used for low power consumption and efficient use of
memory. This MCU contain full Bluetooth software stack.

EEPROM

It contain basic information for address, name and RF information so that
Microcontroller read and set value for corresponding block.

Audio Interface

Although MB8811C1B contain PCM interface for Audio, it does not decode audio
directly, all encoded audio streaming would be decoded at Microcontroller.

Clock Input and Generation

The reference clock for the system is generated from a TCXO or crystal
input 26MHz. All internal reference clocks are generated using a ph ase
locked loop, which is locked to the external reference frequency.

Radio

Common TX/RX terminal simplifies external matching; eliminates external
antenna switch.
BIST minimises production test time. No external trimming is required in
production
Full RF reference designs available
Bluetooth 4.0 Specification compliant

Bluetooth Software Stacks

CSR’s Bluetooth Protocol Stack runs on the on-chip and MCU in a variety of
configurations:

- Standard HCI (UART or USB)

- Fully embedded RFCOMM

- Customised builds with embedded application code

Power

For Class 1 Bluetooth applications, the regulator used to derive 3.3V from
VBAT.

How to design of the power regulation

There is a regulator on the motherboard to provide the 3.3V for MB8811C1B’s power
regulation .