Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 45 subscribers
  • Views 429 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1246

Santiago Migliorelli
Intellectual 350 points
Other Parts Discussed in Thread: ADS1246, MSP430F5438

Hi, I'm having problems reading the conversion result of my ADS1246. It's connected to a MSP430F5438.

Before commenting possible software problems, let's comment the hardware, because I'm not sure if I'm doing it well..

I have connected the ADS pins like this:

1- 3.3V

2- Gnd

3- ACLK of the MSP (4,5MHz)

4- GPIO (SIMO)

5- NOT CONNECTED

6- NOT CONNECTED

7 & 8- sinusoidal waveform (7 positive, 8 negative)

9- 5V

10- Gnd

11- GPIO (SIMO)

12- GPIO (SIMO)

13- GPIO (SOMI)

14- UCBSOMI

15- UCBSIMO

16- UCBCLK

It's this ok?

Thanks you.

  • 0
    TI__Guru** 113765 points

    Hi Santiago,

    Pins 1 and 2 are ok.  For pin 3, 4.5MHz clock is the absolute maximum for the ADS1246, so you may want to try using the internal clock first by holding the pin low.  Pin 4 must see a logic high or the device will not operate.  The ADS1246 requires a reference, and this part does not have an internal reference.  To get results from the ADS1246 pins 5 and 6 must be connected to a valid reference voltage.  The signal applied to the analog inputs must be within the common mode input range of the ADC.  With your supply configuration you cannot apply a voltage below ground or you will damage the part.  Pins 9 and 10 are ok.  Pin 11 must be logic high or the ADC will be in a powered down state.  Pin 12 must be low throughout the entire communication transaction (not just each byte communicated.)  Pin 13 will toggle if the ADC is converting.  The remaining pins are correctly connected.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Intellectual 350 points

    Thank you Bob, as always you were very helpful. I wasn't connecting pins 5 and 6.