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I need some help with design with Bluetooth. We are building a new design and adding another Bluetooth feature. Classic / Simple Bluetooth with analog audio.
See attached image.
Package:Standard package, SMD
Type:Module
Material:PCB + Electronic components
Service type:One-stop turnkey service
Application:Bluetooth Headsets
specification:Bluetooth v4.1 or better
Bluetooth Chip:?
Logo:Logo Customize
Accept:ODM/OEM
Certificate:CE RoHs FCC
Temperature:-20~+70℃
Frequency range:2402~2480MHz
VCC : 3.3 volts
Mic bias output: 1.5 volts to 2.5 volts
Will drive 16 ohm speaker
Must have analog input for Microphone, and analog output for speaker. The device will be sending legacy Bluetooth audio to a cell phone.
Will need a button input to put headset in pairing mode. Will have indicator ouput to let user know that pairing to a cell phone was achieved. Will need 2 button inputs to increase and decrease the volume to the speaker. Size with antennae can be no larger than 12mm x 25mm. Smaller is better. Will have signal inputs for pairing etc. I will be do a surface solder of module to another larger board. Will be sold in the USA.
Many BLE transceivers are built on an MCU with the radio. It means you must use a BLE transceiver (Nordic Semi, for instance) with a Bluetooth audio feature. Those buttons will be connected to the GPIOs of the chip. The microphone can be chosen to be a digital output MEMS connected to an I2S or PDM peripheral of the BLE chip. It’s a normal feature as well.
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