ADS54J60 SPI

Jiri Voltner

Other Parts Discussed in Thread: ADS54J60

Hi,

We have board with three ADS54J60 ADCs. I try configure these ADCs through SPI. I can read/write regs from the master or the ADC page, but when I try readback regs from the other pages I always get 00h.

After I had written address 4003h with 00h (LSB byte of page address), then I write address 4004h with 68h (MSB byte of page address). I wanted read back these regs. So I wrote address C004h and read back the content, but I got 00h. I tried read regs which are not 00h after reset (page 6900h regs 01h, 06h or 07h) according the datasheet chapter 7.4.1.6., but without success too...

Any Idea?

Best regards,

Jiri

over 9 years ago

0 jim s over 9 years ago

TI__Guru* 91947 points

Jiri,

Make sure the ADC sample clock is present and either a hardware or software reset (add 0x00) is issued before doing any writes.. Without this, the SPI will not be able to write to all locations.

Regards,

Jim

0 Jiri Voltner over 9 years ago in reply to jim s

Prodigy 80 points

Thank you Jim!

I had power down CLKs. I can read regs from pages 6800h, 6900h and 6A00h now. But I still can't read back JESD bank page general reg 04h, which is marked as R/W...

Best regards,

Jiri

0 jim s over 9 years ago in reply to Jiri Voltner

TI__Guru* 91947 points

Jiri,

These may be write only. I am checking with the design team.

Regards,

Jim

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ADS54J60 SPI