# Sizing series resistors for logic inputs of a BLDC driver

I'm designing a BLDC motor driver using the MP6532 driver. Pg. 4 of the datasheet specifies the Logic Input Current as +/- 20uA. If I'm driving the logic inputs from an STM32F103, this would mean that the driver needs a series resistance on each of its logic control pins to be 3.3V/20uA = 165Kohms This seems unusually high and I'm wondering if my calculations are correct. Or should I simply connect the pins directly and not worry about this?

• IN(H) means you need at worst 20uA for the signal to register as logic high. Sep 2, 2021 at 6:04
• STM32 has 25 ohm drivers which can handle 20 uA with ease. Sep 2, 2021 at 6:40