Document
BM90
Bluetooth® 3.0 Multi-Speaker Stereo Audio Module
Features
System Specification
Compliant with Bluetooth Specification v.3.0 + EDR in 2.4 GHz ISM band module
It supports following profiles : - Hands Free 1.5 - Headset 1.0 - A2DP 1.0 - AVRCP 1.0
Baseband Hardware
Built-in 16MHz main clock input. Built-in internal ROM for program memory Support to connect to two hosts ( phones, tablets…)
with HFP or A2DP profiles simultaneously Adaptive Frequency Hopping (AFH) avoids
occupied RF channels Fast Connection supported
RF Hardware
Fully Bluetooth 3.0 + EDR system in 2.4 GHz ISM band.
Combined TX/RX RF terminal simplifies external matching and reduces external antenna switches.
Max. +4dBm output power with 20 dB level control from register control.
Built-in T/R switch for Class 2/3 application To avoid temperature variation, temperature sensor
with temperature calibration is utilized into bias current and gain control. Fully integrated synthesizer has been created. There requires no external VCO, varactor diode, resonator and loop filter. Crystal oscillation with built-in digital trimming for temperature/process variations. Built-in PCB antenna.
Audio processor Support A-Law or -Law PCM format, or CVSD
(Continuous Variable Slope Delta Modulation) for SCO channel operation. Noise suppression Echo suppression SBC decoding Packet loss concealment Build-in one languages (English) voice prompts and 20 events for each one Support SCMS-T
Audio Codec
16 bit DAC and 16 bit ADC codec 94dB SNR DAC playback 85 dB SNR ADC.
Peripherals
Built-in Lithium-ion battery charger (up to 350mA) Integrate 3V, 1.8V configurable switching regulator
and LDO Built-in ADC for battery monitor and voltage sense. A line-in port for external audio input Two LED drivers Built-in 32Kb EEPROM
Flexible HCI interface
High speed HCI-UART (Universal Asynchronous Receiver Transmitter) interface (up to 921600bps)
Package
15x29mm2 40 pins package
Description
BM90 multi-speaker stereo audio module is a compact, highly integrated module for Bluetooth v3.0 with Enhanced Data Rate 2.4GHz applications. This module is fully compliant with Bluetooth specification and completely backward-compatible with Bluetooth 2.0 or 1.2 systems.
It incorporates IS1690S multi-speaker stereo audio chip, 32Kb EEPROM, PCB antenna, and ISSC’s own Bluetooth software stack to achieve the required BT v3.0 with EDR functions.
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BM90 Module
To provide the superior audio and voice quality, it also integrates a DSP co-processor, a PLL, and a CODEC dedicated for voice and audio applications.
For voice, not only basic CVSD encoding and decoding but also enhanced noise reduction and echo cancelation are implemented by the built-in DSP to reach the better quality in the both sending and receiving sides. For enhanced audio applications, SBC decoding functions can be also carried out by DSP to satisfy Bluetooth A2DP requirements.
In addition, to minimize th.