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Need guidance on selecting Bluetooth module

Prashanth Kumar N
Intellectual 470 points
Other Parts Discussed in Thread: CC2541, CC2540

Hi,

I am a newbie to Bluetooth module and to try my hands on getting to know this amazing technologies, have chosen to take up my own project to get my hands dirty. In the process of this, i am looking at a Bluetooth module which can satisfy the below requirements.

1. Audio transfer bluetooth capability
2. GPIO control

When i Google , i did come across CC2541 series and good part about this is 8051 in built and form factor.

Is there any other TI chip which also supports audio module at reasonable price?

Can cc2541 drive relays of 5 or 12v ?

-Prashanth

  • 0
    Guru 735685 points

    CC254x is designed for BLE and not suitable for audio transmitting. I would suggest you using CC256x for audio transmitting. By the way, it can't drive relay of 5V or 12V directly.

  • 0 in reply to YiKai Chen
    Intellectual 470 points

    Thanks for the reply. 

    On CC2541, what is the GPIO voltage? As i know it should be 3v as supply is 3v voltage. Is my understanding right?

    If so then for driving a 12v relay, i would  need additional circuits right?

    After checking datasheet of CC256x, i see it has no 8051. Is this right?

    As i have a C2541 eval kit, how easy is it to migrate to cc256x?  For eg: GPIO examples on cc2541 will it work straight away on cc256x?

  • 0
    Guru 22270 points

    Hello Prashanth,

    The CC2541 Datasheet does say that it can handle voice quality audio.  There is also an Advanced Remote Controller that accepts voice commands.  The CC254x are Bluetooth Low Energy devices.  They do not support the Bluetooth found in Bluetooth headsets or mics.

    Can the CC2541 drive a 12V relay? No, not directly.  Can it drive a 5V relay? Yes, depending on the coil current.  The CC2540 can actually run on 5V, although you are not suppose to do it!  I have a controller in the field for almost a year that has been running on 5V and 4.2V when on Li-ion battery.  Do it at your own risk!  The Datasheet specifies the min/max values for all port pins.

    As YiKai stated, the CC256x would be the best device if you want true Bluetooth functionality.  They are not 8051 based and would require an MCU to control it such as the MSP or Tivia.

    Thanks,