5 AFE4500 Register Generation Excel
The AFE4500_Register_Generation_v*.xlsm will be given by TI. This configuration file will be in the EVM
software installation directory.
Default file location: C:\Program Files\Texas Instruments\Bio-Sensing\AFE4500EVM\Register config\
AFE4500_Register_Generation_v*.xlsm
By default the EVM ships in LDO enable mode with following configuration
• Clocking : Internal oscillator
• PPG configuration
– PPG output data rate: 50 Hz
– 3 Phases ( Phase1, Phase2, Phase3) are defined for PPG: AMB1, LED, AMB2
– PPG Phases are sampled from Green PD of sensor board
– TX1 (connected to Green LED on sensor board) is used to LED Phase.
– TIA Gain (i.e. Rf): 250 kΩ
– Sampling width: 117 μS
– Noise reduction filter: 2.5 KHz
– ANA AACM: Enabled to cancel ambient signal from all Phases
– DIG AACM: Enabled to cancel the DC in LED Phase.
• ECG Configuration
– ECG output data rate: 500 Hz
– ECG INA Gain: 21
The register generation excel has different worksheets for configuring the AFE. The various worksheets in this
file are described below.
1. PPG Configuration
• Phase Definition
• Device Configuration
2. ECG - Configuration
3. BIA-Configuration
4. Mix configuration
5.1 PPG Configuration
5.1.1 Phase Definition
This sheet is used to specify number of phases, timing, signal chain parameters associated with each phase,
and the LED/PD association for each phase. The phase type is selected from the drop down menu (Ambient
and LED) and the appropriate parameters for the phase type are automatically shaded in blue. Specify only
the parameters that show up in the Blue boxes. Manually fill each cell using the drop down boxes (do not cut
and paste values across cells). Also, fill only the boxes that show up in blue. Do not modify the cream- colored
boxes.
Figure 5-1. PPG per-phase configuration
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AFE4500 Register Generation Excel
SBAU370 – APRIL 2021
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AFE4500 EVM User Guide 23
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