• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 206 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TPS929240-Q1: Minimum ADC Reading

mustafa fathy
Prodigy 81 points
Part Number: TPS929240-Q1

Hello,

Every periodic time, we need to send write request to (ADCCHSEL) register to select new selector, then read (ADC_OUT) register.

This should be repeated until finishing from reading all ADC selectors.

so 

- What is the minimum time between changing ADC selector and ADC's data availability?

- We noticed no data available if time is 20 Microseconds as attached below
  

  • 0
    TI__Genius 17550 points

    Hi，

    It depends on what kind data you expected to read，for example，supply，bat should be able to read out right always. while out， SLS etc. takes longer time to read out and related to PWM duty cycle etc. 

    Not sure about your question.in the figure， it wrote 1D to 90h to set ADC to read OutH0 voltage. ADC wait until outH0 turn on with delayed time to sample voltage value. （please refer to 7.3.5.1 for detials）Thus，it is duty cycle and PWM status related. You may monitor ADC_DONE status to make sure that data has been sampled before reading ADC