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AFE44x0SPO2EVM FAQs
9 AFE44x0SPO2EVM FAQs
9.1 EVM communicating with the PC application
A quick and simple check to verify serial register write operation is to put the AFE44x0 in power-down
mode. Follow the sequence to check if the GUI is communicating with the EVM.
• In Device Configuration → Global Settings tab, select Powerdown_AFE
• This powers down the AFE and the VCM output voltage of the AFE drops to 0 V
• VCM is measured at the VCM_AFE serial jumper resistor R28 on the board
9.2 ADC_RDY signal
After executing the GUI, observe the ADC_RDY waveform at series jumper resistor R26.This should be at
the same frequency as the PRF.
Figure 39 shows the ADC_RDY waveform at 500-Hz PRF.
Figure 39. ADC_RDY Waveform at 500-Hz PRF
35 SLAU480A – January 2013 – Revised February 2013 AFE4400 and AFE4490 Development Guide
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