what is the default configuration for ADPD4100/ADPD4000 Wrist worn PPG for Heart Rate ?

Meanwhile, I am sharing the ADPD4000 PPG measurement config file. For ADPD4100, please contact me.

#ADPD4000 PPG Measurement
0009 0090 # 32MHz trim
000B 02B2 # 1MHz trim
000D 2710 # Sampling rate, 0D05 300 Hz, 2710 100Hz, 1388 200Hz, 09C4 400 Hz
000F 0006 # 1MHz osc
0010 0000
0020 0002 # In1 & In2 to VC1 during sleep
0022 0403 # gpio3 output, gpio0 out invert
0023 0002 # gpio1 int x
0014 8000 # fifo to int x
0021 0000 # inputs configured single-ended
0024 5000 # setup timeslot A trigger to gpio3
# Slots config

## Timeslot A AFE Settings, default PPG mode
0100 0000 # Rs=500ohm, CH2 disabled
0101 41DA # TIA-BPF-INT
0102 0005 # IN1 to CH1, IN2 to CH2
0103 5002 # 0x5002: precon to TIA_VREF, VC1= Vdelta
0104 E3C0 # 1.3Vref, 200k gain at CH1
0105 000E # LED 1A current, please increase the current if needed
0106 0000 #
0107 01FE # NUM_INT:NUM_REPEAT (use even number of pulses when in chop mode)
0109 0210 # LED pulse width and offset
010A 0003 # INT pulse width
010B 1010 # INTEG_OFFSET
010D 0099 # chop -++-
010E 0000 # CH1 ADC offset = 0, use chop mode
010F 0000 # CH2 ADC offset
0110 0003 # 3 bytes signal
0112 0000 # no decimation

Meanwhile, I am sharing the ADPD4000 PPG measurement config file. For ADPD4100, please contact me.

#ADPD4000 PPG Measurement
0009 0090 # 32MHz trim
000B 02B2 # 1MHz trim
000D 2710 # Sampling rate, 0D05 300 Hz, 2710 100Hz, 1388 200Hz, 09C4 400 Hz
000F 0006 # 1MHz osc
0010 0000
0020 0002 # In1 & In2 to VC1 during sleep
0022 0403 # gpio3 output, gpio0 out invert
0023 0002 # gpio1 int x
0014 8000 # fifo to int x
0021 0000 # inputs configured single-ended
0024 5000 # setup timeslot A trigger to gpio3
# Slots config

## Timeslot A AFE Settings, default PPG mode
0100 0000 # Rs=500ohm, CH2 disabled
0101 41DA # TIA-BPF-INT
0102 0005 # IN1 to CH1, IN2 to CH2
0103 5002 # 0x5002: precon to TIA_VREF, VC1= Vdelta
0104 E3C0 # 1.3Vref, 200k gain at CH1
0105 000E # LED 1A current, please increase the current if needed
0106 0000 #
0107 01FE # NUM_INT:NUM_REPEAT (use even number of pulses when in chop mode)
0109 0210 # LED pulse width and offset
010A 0003 # INT pulse width
010B 1010 # INTEG_OFFSET
010D 0099 # chop -++-
010E 0000 # CH1 ADC offset = 0, use chop mode
010F 0000 # CH2 ADC offset
0110 0003 # 3 bytes signal
0112 0000 # no decimation

Hi,

 i am trying measure  Heart rate using adpd4100z evaluation board with nrf52840 controller board 

is that configuration working ? i have set 3 bytes for signal .

how many data register i should read and how to swap the data for calculate the bpm?

Hi there,

Yes, the confiig in the previous response works well for PPG measurement.

With regard to the FIFO read and bpm calculation, you will need to log the timestamp when you read data from the FIFO so you have a time series from which you can derive the peak-to-peak duration and convert it to the heart rate.

Regards,

Glen B.

Hi sir ,

how to log the timestamp with out using wavetool evaluation software, we are using controller board nrf52840 wavetool its not connecting with this .

can you give the details after reading the data how to convert bpm?

Hi there,

You can get the timestamps in your routine of FIFO interrupt and associate the timestamps with the data block. Typically the SDK of your choice of micro allows you log the timestamps.

This Nordic forum thread may be helpful https://devzone.nordicsemi.com/f/nordic-q-a/43701/logging-with-timestamp-on-sdk-15-2

Once you have the time series, you would need to develop your algorithm to get the beat-to-beat interval and further the bpm.

Regards,

Glen B.