ADS1248 FSC registers reset value

yavuz delican

Other Parts Discussed in Thread: ADS1248

Hello.

I want to write the registers of ADS1248 all at once in our application. But to do that, I need to know the reset values of FSC registers.

In the datasheet, it is written that "reset value for FSC is factory trimmed for each PGA setting". In our application PGA is always 1.

So how can I get the reset value of FSC registers? Do I need to read them first?

Best regards.

Yavuz Delican

over 13 years ago

0 Bob Benjamin over 13 years ago

TI__Guru** 113765 points

Yavuz,

Yes, you will need to read the FSC registers to know the default values and they will be different for each PGA setting. The FSC values will change for each PGA setting on the ADS1248. What I usually do with this device is to write in two blocks. Most often I write to just the first four registers. I generally don't write the OFC or FSC registers. I only write to the upper 5 registers if I'm using them.

Best regards,

Bob B

0 yavuz delican over 13 years ago in reply to Bob Benjamin

Prodigy 140 points

Hello Bob;

I need to write MUX0,MUX1,SYS0,IDAC0 and IDAC1 registers of ADS1248.

As you do; I can write MUX0,VBIAS(default),MUX1 and SYS0 registers once (in one block).

But do I need to wait 64 tosc before writing IDAC0 and IDAC1 as you said before?

Best regards;

Yavuz Delican

0 Bob Benjamin over 13 years ago in reply to yavuz delican

TI__Guru** 113765 points

Yavuz,

Special state machine actions take place (primarily in regards to the digital filter reset) when writing to the first four registers, so the 64 oscillator clock period wait time is to make sure that the state machine has completed one cycle before trying to restart the cycle. You should have no problem writing to the remaining registers immediately following the previous block write to the first four registers.

Best regards,

Bob B

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ADS1248 FSC registers reset value