ADC12DJ5200RF: Register 0x350 ~0x357 cannot be written

Amy Luo

Expert 6895 points

Part Number: ADC12DJ5200RF

Hi team,

For example, write data 0x1f to register GAIN_A0_FGDES（address：0x354), the timing is correct:

Other address registers can be read and written correctly. Is there anything special about register 0x350 ~ 0x357

GAIN_A0_FGDUAL（address：0x350）；

GAIN_A1_FGDUAL（address：0x351）；

GAIN_B0_FGDUAL（address：0x352）；

GAIN_B1_FGDUAL（address：0x353）；

GAIN_A0_FGDES（address：0x354）；

GAIN_A1_FGDES（address：0x355）；

GAIN_B0_FGDES（address：0x356）；

GAIN_B1_FGDES（address：0x357）；

over 4 years ago

0 Neeraj Gill over 4 years ago

TI__Mastermind 20541 points

Hi Amy,

I think you have older version of silicon which does not support writing values to these registers. Can you please read the of register 0x04 and report back the value to me?

Regards,

Neeraj

0 Amy Luo over 4 years ago in reply to Neeraj Gill

TI__Expert 6895 points

Hi Neeraj,

The register value read back from the register CHIP_ ID（address=0x04） is 0x21.

0 Neeraj Gill over 4 years ago in reply to Amy Luo

TI__Mastermind 20541 points

HI Amy,

Ok that means you have the latest version of the silicon. I will try these register writes tomorrow and let you know.

0 Amy Luo over 4 years ago in reply to Neeraj Gill

TI__Expert 6895 points

Hi Neeraj,

Could you give me a feedback

0 Neeraj Gill over 4 years ago in reply to Amy Luo

TI__Mastermind 20541 points

Hi Amy,

All the registers you mentioned 0x351-0x357 only allow lower 5 bits[4:0] to be written the upper bits can only be 0. So the max value you can writes to these registers is 0x1F. Try writing any value from 0x0 to 0x1F and you should be able to write to these register.

Regards,

Neeraj

0 Amy Luo over 4 years ago in reply to Neeraj Gill

TI__Expert 6895 points

The data written by the customer is 0x1F which is between 0x0 and 0x1F. You can see the SPI waveform in the post.

0 Neeraj Gill over 4 years ago in reply to Amy Luo

TI__Mastermind 20541 points

Hi Amy,

Can you try writing 0x01 to these registers. See if you are able to read back

Regards,

Neeraj

0 Amy Luo over 4 years ago in reply to Neeraj Gill

TI__Expert 6895 points

Hi Neeraj,

After writing the value of 0x01 to these registers again, the value of read back register is still 0x00.

Thanks,

Amy Luo

0 Neeraj Gill over 4 years ago in reply to Amy Luo

TI__Mastermind 20541 points

Hi Amy,

Is this behavior observed on several devices? Has customer tested multiple devices and observed same behavior?

Regards,

Neeraj

0 Amy Luo over 4 years ago in reply to Neeraj Gill

TI__Expert 6895 points

Currently, the customer is using two ADCs for time-alternating sampling, and both ADCs are the same behavior.

0 Neeraj Gill over 4 years ago in reply to Amy Luo

TI__Mastermind 20541 points

Hi Amy,

Can you please try the following.

1. Turn on the device and apply the clock to the ADC.

2. Write the value of 0xB0 to register address 0x00.

3. Wait for 1 second.

4. Read back the bit register address 0x270 and report the value to me.

Regards,

Neeraj

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ADC12DJ5200RF: Register 0x350 ~0x357 cannot be written