DRV8833C: Logic inputs high with VM=0V

Shinya Sawamoto

Expert 5285 points

Part Number: DRV8833C

Hi team,

When logic inputs(e.g. 3.3V) from MCU are high with VM=0V, is there a large current leak pass or not?

Thanks in advance.
S.Sawamoto

over 6 years ago

0 Hector Hernandez Luque over 6 years ago

TI__Expert 8985 points

For each digital pin when the respective digital pin's voltage is equal to 3.3V:

AIN1 = 32 mA

AIN2 = 32 mA

BIN1 = 32 mA

BIN2 = 32 mA

nSLEEP = 0 mA

0 Shinya Sawamoto over 6 years ago in reply to Hector Hernandez Luque

TI__Expert 5285 points

Thanks Hector,

Let me confirm just in case.
It can be estimated the 32mA flows through the internal high-side ESD diode with 100ohm impedance, is it correct?
Does the nSLEEP have a different input ESD structure from xIN?

Regards,
S.Sawamoto

0 Hector Hernandez Luque over 6 years ago in reply to Shinya Sawamoto

TI__Expert 8985 points

Hi Shinya,

For both questions: I do not have a definite answer at this time. I will verify internally and get back to you with an official response.

0 Hector Hernandez Luque over 6 years ago in reply to Hector Hernandez Luque

TI__Expert 8985 points

Hi Shinya,

I had additional circuitry on those pins I measured the current on. I redid the testing after removing that circuitry and I am confirming the results and internal pin structure with my team. Expect a response in the next couple of days.

0 Hector Hernandez Luque over 6 years ago in reply to Hector Hernandez Luque

TI__Expert 8985 points

Hi Shinya,

I have reviewed the updated results with my team. There is no internal ESD leakage path.

New results.

AIN1 = 0 mA

AIN2 = 0 mA

BIN1 = 0 mA

BIN2 = 0 mA

nSLEEP = 0 mA

My previous results had the MCU connected to the digital pins where I supplied the 3V3 voltage and VM had a 3V3 LDO connected to it. I removed the MCU connections and the LDO to isolate the testing directly to the driver.

0 Shinya Sawamoto over 6 years ago in reply to Hector Hernandez Luque

TI__Expert 5285 points

Hi Hector,

Thank you so much for your dedicated support work!

Regards,
S.Sawamoto

0 Hector Hernandez Luque over 6 years ago in reply to Shinya Sawamoto

TI__Expert 8985 points

Hi Shinya,

Further clarification, as I measured my data in mA instead of uA:

AIN1 = 21.45 uA

AIN2 = 20.91 uA

BIN1 = 20.98 uA

BIN2 = 20.76 uA

nSLEEP = 06.23 uA

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DRV8833C: Logic inputs high with VM=0V