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bq51013B / Behavior of TS-CTRL signal

S.Satoshi
Guru 21685 points
Other Parts Discussed in Thread: BQ51013B

Hi, Team

I would like you to check the waveform of TS-CTRL signal from our customer. Can you give your comments for following questions in reference to attached waveform?

  1. I believe that the behavior of TS-CTRL signal (Circled in red #1) is normal at Rx coil is contacted. Is my understanding correct?
  2. The pulse duration of TS-CTRL signal is extended when the Rx coil is removed (Circled in red #2). And after that the pulse duration is shortened when Rx coil is contacted again (Circled in red #3). Can you explain what is happened at #2 and #3?

 

Best Regards,

Sonoki / Japan Disty

bq51013B TS-CTRL signal.pdf
  • 0
    TI__Guru* 75656 points

    Hello Sonoki

    The pulses during time 1 are normal.

    Pulses during time 2 are probably due the TX firing Digital Ping because it picked up the movement of the RX in the area though analog ping.

    I am not sure about the mult pulse during time 3 but this can be caused by the TX / RX restart.

     

    Compare TS-CTRL with V-Rect (TP12 EVM) during time 2 and 3.

  • 0 in reply to Bill Johns
    TI__Guru* 75656 points

    The pulses during time 3 are normal also.  The TS pin pulse is synchronized to the Control Error Packet (CEP) that are sent to the Transmitter.  See bq51013B EVM user’s guide figure 5—Start-up.

    http://www.ti.com/lit/ug/sluua44a/sluua44a.pdf

    The bumps that you see every 35mS are CEP sent at start up, this matches what your observed on the TS pin (time 3) at start up just before 5V turns on.

  • 0 in reply to Bill Johns
    Guru 21685 points

    Hi Bill-san,

    Thank you for your comments for the customer's waveform. I understand that the waveform looks like normal as you commented. I'll communicate with them and please let me ask again if I'll received further questions.

    Best Regards,

    Sonoki