PGA2505: Asking for PGA2505 SPI control

SHH

Part Number: PGA2505

Hi Team,

Customer uses PGA2505 on the new project. Would you please review and provide comment for the questions?

1. customer used PGA2505 and PGA2505 was controlled this chip via SPI bus;

2. PGA2505 will affect the system SPI bus in our system as follows:

a. R290 mounted, System SPI_CLK's high level is about 1V(abnormal);

b. After remove R290, System SPI_CLK's high level recovered to 3V3;

Have you met this issue before? or Would you give us some comments about it?

BR,

SHH

0 Andy Peters over 3 years ago

Genius 3945 points

Sounds like there's a short on your board. Measure the resistance between pin 10 and adjacent pins and to ground.

Also, series terminations should be placed close to the driver, not the receiver.

0 SHH over 3 years ago in reply to Andy Peters

Hi Peter,

Do you have mail?

there is no short found, the issue(pull down whole system level to 1V) was also found at MOSI signal, but CS signal was OK(3V3).

BR,

SHH

0 Iwata Etsuji over 3 years ago in reply to SHH

Hi SHH,

We had already started discussing with email.

I'm sorry for inconvenience, but can we close this thread?

Thank you and Best regards,
Iwata Etsuji

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