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DRV5056-Q1: Regarding the selection of the Magnetic Sensor.

Vishaal S
Prodigy 20 points
Part Number: DRV5056-Q1
Other Parts Discussed in Thread: TPS92638-Q1, DRV5056, TMAG5131-Q1, DRV5023-Q1, DRV5055, TMAG5273, TMAG5170, TMAG3001, TMAG5173-Q1, DRV5033-Q1

Tool/software:

Hi sir/Madam, 

We are planning to use DRV5056-Q1 for our automotive application. We will have to enable / shutdown the LED driver IC TPS92638-Q1 based on the magnetic sensor output. we are planning to use DRV5056A1 as its voltage output is 0.6V at 0 magnetic field and it suits the Vil level of EN pin of LED driver TPS92638-Q1 which is 0.7V. However, this DRV5056 is unipolar, so can you please recommend any bipolar magnetic sensor output compatible with logic low (0.7V max) and high levels(2V min) of EN pin of LED driver.

Thanks, 

Vishaal S

  • 0
    TI__Mastermind 21630 points

    Vishaal,

    Do you need a linear output response or are you trying to define two states, hi and low?

    Thanks,

    Scott

  • 0 in reply to Scott Bryson
    Prodigy 20 points

    Hi Scott, 

    It would be fine if it has linear output response and it should have Offset Voltage of less than 0.6V with 0 Magnetic Field (As this will be interfaced with the Enable Pin, (VIL) Voltage of EN Pin of LED Driver IC TPS92638-Q1 is 0.6V). And also we are open to consider magnetic sensor IC switch with high and low states provided IC gives high output state with sensing of magnetic field.

    Thanks, 

    Vishaal S

  • 0 in reply to Vishaal S
    TI__Mastermind 21630 points

    Vishaal,

    It sounds like you are wanting a device that is either an omni-polar switch with active high output or a linear sensor like DRV5056 but that responds identically for either + or - fields?  We don't have anything that exactly matches this. 

    We do have TMAG5131-Q1 and DRV5023-Q1 which are active high switches, but these are both unipolar.   You would need to ensure a positive field is provided to the sensor.

    DRV5055 is bi-polar, but the zero point generates and output of Vcc/2.

    Another option is to use a 3D Hall-effect sensor like TMAG5170,TMAG5273,TMAG3001, or TMAG5173-Q1.  These devices have digital communication interfaces, but can be programmed to send an interrupt or alert signal when a specific threshold is crossed.  You would need to be able to identify whether a + or - field is applied to the sensor, but this could be used to provide what you need.  The ALERT and INT pins are active low, but can be configured with a low threshold that is greater than B=0 or a high threshold that is less than B=0.  If the appropriate threshold is configured, then you might be able to have the pin driven low when B=0 and pull high to Vcc when appropriate.

    Thanks,

    Scott

  • 0 in reply to Scott Bryson
    Prodigy 20 points

    Hi Scott, 

    Thank you for your quick support and response. Can we consider DRV5033-Q1 for this. Could you cross check if it will work on for our application. Also tell us if this will be better than 3D Hall effect sensors.

    Thanks, 

    Vishaal S

  • 0 in reply to Vishaal S
    TI__Mastermind 21630 points

    Vishaal,

    DRV5033-Q1 is an open drain output device, so the idle state is pulled-high

    So at B=0 you will be at Vcc, but when a field is applied above BOP you will have the output driven low.  You could use this, but if you need to have a low output at B=0 you would need to place an inverter in series with the output signal.

    Thanks,

    Scott