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AFE44x0SPO2EVM FAQs

10 AFE44x0SPO2EVM FAQs

10.1 EVM Communicating With the PC Application

CAUTION

AFE44x0SPO2EVM GUI v.2.0 works with FW revision 1.3. Follow the steps

outlined in Section 6 to upgrade the firmware to revision 1.3.

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

10.2 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 45 shows the ADC_RDY waveform at 500-Hz PRF.

Figure 45. ADC_RDY Waveform at 500-Hz PRF

SLAU480C–January 2013–Revised May 2014 AFE4400 and AFE4490 Development Guide

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