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BOOSTXL-TLV8544PIR: Access the PIR from CC2538

Raghunandana DS
Mastermind 6385 points
Part Number: BOOSTXL-TLV8544PIR
Other Parts Discussed in Thread: CC2538, , CC2650, TLV8544, CC2640

Hi  I have CC2538 evolution module with SmartRF06 board and I have BOOSTXL-TLV8544PIR.

I am trying to access the PIR sensor from CC2538. I found some info on the link  But I not found the Power supply pin for PIR, I tried by giving the power supplies of 3.3 and 5 to the power pins I was getting random varying voltages from all of PIR Low THR OUT, High THR OUT, PIR Signal OUT and  1STAG OUT.   I am in confusion how to read value from this sensor, I not get what is 1STAG OUT. Can any one please help to access the PIR from MCu other than CC2650 Launchpad.

Thank you.

  • 0
    TI__Prodigy 600 points
    Hello,

    If you would power the boosterPack using an external supply, make sure it is first detached from the host processor board. After connecting the power supply directly to the expected pins, use a DMM to check the voltage first at the connector, then at the IC TLV8544 V+ (pin 4) and make sure they're within range. If the supply looks okay, use a scope to check the signal at the 1STAG OUT pin. Waving your hand should produce a small but noticeable change to the waveform. If not, please post a scope shot and we'll go from there.

    Thanks.

    -Jian
  • 0 in reply to Jian Zhang5
    Mastermind 6385 points
    Hi Jian,
    Thanks for the reply, Now I was getting some analog voltage through 1Stag out and other out pin also. I taught 1Stag out means one time read. I was getting values in the range of 400 to 700 decimal on giving to ADC with external ref voltage.
    Is it the correct data what expecting from PIR, if it is can I know how to convert to the engineering value, what is max range of this PIR, how to change the "lower and higher threshold".

    Thank you.
  • 0 in reply to Raghunandana DS
    TI__Prodigy 600 points
    The booster pack is designed for CC2640 LaunchPad MCU. If you're using another MCU board, the signal (analog) and threshold (binary) output may (or may not) need to be pre-processed to make it compatible with your particular MCU (for which our assistance is out-of-the-scope)

    Here is the detail for the signal output:

    1. 2 analog signal amplitude should be within 0V to 3V
    2. the 2 threshold out is binary with either 0V or 3V

    Please make this "Answered" if this answers your question.

    best.

    -Jian Zhang
    LPAC Applications