TCAN4550-Q1: SPI read issue

Mahendra Patel1

Part Number: TCAN4550-Q1

Hello Team,

My customer try to carry read operation with TCAN4550-Q1 SPI, but they are getting continuous FF stream (they tried with code 0x41).

Please see attached waveform we captured and also attached file(saleae logic analyser tool required).

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/SPI_5F00_waveforms_5F00_as_5F00_per_5F00_TCAN_5F00_Read.sal

Let me know how to go about debugging this problem.

Regards,

Mahendra

over 4 years ago

+1 Eric Hackett over 4 years ago

TI__Guru 74262 points

Mahendra,

Can you let us know what state the TCAN4550-Q1 is in? And what is the CPOL and CPOH for the SPI configuration? The fact that the device out line is held high tells me that the TCAN4550-Q1 is not registering the SPI transaction at all.

Regards,

Eric Hackett

0 Mahendra Patel1 over 4 years ago in reply to Eric Hackett

TI__Expert 3560 points

Thanks Eric,

Customer connected SDO line of TCAN4550-Q1 to MOSI of MCU, which was the problem. They rectified the problem and it's working fine now.

Regards,

Mahendra

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TCAN4550-Q1: SPI read issue