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ADS8330 : channel switching problem

sudeep kumar
Prodigy 40 points
Other Parts Discussed in Thread: ADS8330

from sudi

hello ti,

i am using the ADS8330 to get ADC samples on both channels i have configured the ADC in Manual channel select ,Internal clock,Manual Trigger 

the program flow is as like 

1.Select the First Channel to read 

2.Give the CONVST SIGNAL

3.CS to low 

4.Wait for 2msec 

5.give the Read command 

4.wait for 2msec

5.Read the data

6.Remove the CONVST Signal

7.CS to high

8. Select the Second channel to read 

9.Repeat the steps from the 2 to 8

til now i tested that its working for the individual channels

but  while attempting for the second channel data its giving the data of the first channel itself 

If i make the channel 0 GND then the second channel data is also taking GND even if its maintained with some voltage.

ans also TI may suggest that to use the Auto channel select and auto trigger

see as i am using the spi comn, i dont have the control over the SCLK  (WHICH IN TURN CCLK FOR THE ADC)

and also for the Auto channel select i need to enable the TAG bit but i cant read the TAG bit value on the SPI data in as its max register storage will be for the 16 bit only 

So any how i need to go with the MAnual Channel Select , internal clock ,Manual trigger 

If its thing how to solve this problem as i have tried with so many techinques but no result 

whether i need to change the IC itself 

Please help me 

  • 0
    Prodigy 40 points

    hello ti,

    i have one last problem in the ads8330 
    after the reset using the data 0xffffe then configuring it for the manual channel select internal clock and manual trigger mode i have to reset the chip so many times (Power on reset ) in oreder to get the 2 channels data corectly 
    if i dont do (POR) after the configuration then if i give channel selection command then both the channels will show the same data 
    why it is so as my project is going to finish i need to solve this issue
    if ti transfer this problem to bangalore tech centre then i will contact the team and try to solve this through the live conversation