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AFE4400 HRM components

Felix Villar1
Prodigy 90 points
Other Parts Discussed in Thread: AFE4400

Hello,

I am designing a wrist HRM based on the AFE4400. Could you recommend me some parts (leds and photodiodes) you have tested and are working fine?

Thanks,

Félix.

  • 0
    TI__Mastermind 49206 points

    Hello Felix,

    I have attached some of the sensors we have tested below.

    Part number Mfr. Type
    DCM03 APM Korea Integrated dual emitter and photodiode
    APL3015MGC-F01 Kingbright Green Led
    IR17-21C/TR8 Everlight IR Led
    QSB34CGR Fairchild Photodiode
  • 0 in reply to Praveen Aroul
    Prodigy 90 points

    Thanks so much!

    I only want to use the HRM capability, not the pulse oximeter. Any recommendation to connect it?

    Regards,

    Félix.

  • 0 in reply to Praveen Aroul
    Prodigy 90 points

    Hi Praveen,

    I have checked the application note which is on the website and I have two hesitates:

    - what is the purpose of using the BAV99 and the DLW31? Are they mandatory for HRM applications?

    - is it posible to use only one led or it is compulsory to use two LEDs in different bands?

    Thanks,

    Félix.

  • 0 in reply to Felix Villar1
    TI__Mastermind 49206 points

    Hello Felix,

    BAV99W switching diodes are primarily used as diode clamps. If you expect to see accidental higher voltages at the INN, INP, DETP and DETM lines, it is recommended to use clamp diodes to supply and ground to protect the AFE4490 / AFE4400. For battery operated systems this might not be necessary.

    DLW31 are EMI suppression filters. In wearable systems with wireless capability, RF energy can attenuate the signals on the INN and INP channels. It is recommended to use the common mode choke coils to suppress common mode noise.

    The AFE44xx family of devices supports two LEDs for Pulse Oximetry application. For HRM application, you can use only 1 LED with AFE44xx.

     

    Regards

    Praveen.

  • 0 in reply to Praveen Aroul
    Prodigy 90 points

    Praveen, thanks so much for your support!