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DRV8262EVM: Drv 8262 evm how to connect for double bridge mode between my stm and the driver

Eduard Reinhart
Prodigy 20 points
Part Number: DRV8262EVM

Tool/software:

Hello,

I’m using the DRV8262EVM with an STM32F446RE and I want to run it in dual bridge mode (OUT1/2 + OUT3/4).
My goal is to read both current sense outputs IPROPI1 and IPROPI2 separately with the STM32 ADCs (PA0 + PA2).

I have modified the EVM jumpers/solder bridges as shown in the attached picture.
My questions:

  1. Did I set the jumpers correctly for dual bridge mode? (I removed J19, connected J18 = IPROPI1 → STM32 PA0 and J20 = IPROPI2 → STM32 PA2)

  2. For VREF1 / VREF2: Do I need to drive them separately, or can I tie both to the same external 1.65 V reference?

  3. Is my wiring for MODE1 / MODE2 / nSLEEP correct to ensure the device enters dual bridge mode at startup?

  4. In this configuration, should I expect each IPROPI pin to represent the current of its respective half-bridge (OUT1/2 vs. OUT3/4)?

Right now, my STM32 ADC values are always close to 0, so I suspect I might have miswired VREF or IPROPI.

  • 0
    TI__Mastermind 44855 points

    Hi, 

    Thank you for your post. Monday September 1st is national holiday in US. Please expect delay or please wait for our expert assignment on Tuesday US time

  • 0
    TI__Mastermind 19740 points

    Hello,

    Please allow me some time to review and I'll reach out by tomorrow. 

    Best,

    David

  • 0
    TI__Mastermind 19740 points

    Hello,

    1. Yes, this looks correct. Removing J19 removes the tie between IPROPI1 and IPROPI2 and populating J18 and J20 uses 3.3kΩ for IPROPIx resistors. 

    2. The same VREF can be applied to VREF1 and VREF2 if the same current regulation threshold is being set for H-Bridge 1 and H-Bridge 2.

    3.

    MODE1 = 0 during startup to latch to the dual H-Bridge mode.

    MODE2 = 0 for PH/EN or MODE2 = DVDD/floating for PWM

    4. 

    Yes, the IPROPI pins output a current that is proportional to the current flowing in the high-side FETs of the H-bridge, scaled by the current mirror gain AIPROPI.

    Each IPROPIx pin should represent the corresponding H-Bridge current. 

    Best,

    David