• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 40 subscribers
  • Views 284 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.

TIDA-00663: Signals from external controller to board

Denge
Prodigy 90 points
Part Number: TIDA-00663
Other Parts Discussed in Thread: OPA857

Dear,

I have some questions about the signals coming to the  board:

- BP19_PWM_GPIO_TRIGG: I suppose this a pulse.What should be the maximum/minimum length of this pulse?

- TPROP_CALIBRATION_ENABLE_BP10_P3.6: where is this signal used for?  Goes it in conjunction with the BP11_CAL signal?  

- 5K_GAIN_SETTING_BP9_P3.5: is this used to adapt for different types of diodes?


Thanks for clarifying

  • 0
    TI__Intellectual 1560 points
    Hi,

    Answering your questions below:

    -BP19_PWM_GPIO_TRIGG is the signal that initiates the sequence. Pull this up in order to initiate the sequence. No times constraints are required here.
    - TPROP_CALIBRATION_ENABLE_BP10_P3.6 is used to enable the test mode of the OPA857. When it is pulled high it enables the test mode. This is used in conjunction with BP11_CAL to launch the calibration sequence.
    -5K_GAIN_SETTING_BP9_P3.5 is used to control the OPA857 transimpedance gain. Setting the CTRL pin high results in selecting
    the high-gain configuration. Setting the CTRL pin low results in selecting the low-gain configuration.

    Best regards
    Giovanni
  • 0 in reply to Giovanni Campanella
    Prodigy 90 points

    Hello Giovanni,

    After looking in the  data sheet and application note of the   SPL LL90 laser I got the timing of spec of the  BP19_PWM_GPIO_TRIGG signal as  the laser pulses by itself upon a trigger.  This would  be different if a regular laser diode would be used.

    For the moment I'm a little worried about the 70W output power of this laser.  Also the  not standard packaging makes it more difficult for collimating the beam, although not impossible,but not with of the shelf  available optics.

    Thanks for clarifying.