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nlc · 11-17-2011, 03:54 AM

On my "small" 100A FOC controller, the STM32 works @ 3.3V, thus I have a 5V cheap linear regulator to supply throttle and brake pedal (with 4.99K/10K divisor before enter in ADC input of the stm32), and some amp op, but the rest is @ 3.3V, even the two isolated current sensor. I use ACS758 (the +/-100A model but there is a +/-150 and +/-200A model) which accept 3.3V and have a ratiometric output (alway VCC/2 @ 0A current) and sensitivity proportionnal to supply voltage, thus it's very well because if the 3.3V is not very precise it's not a problem, the digital result value of the adc will alway represent the same current value even if 3.3V varies over time (effect of temperature for example).

Regards

11-17-2011, 03:54 AM	#631 (permalink)
nlc EcoModding Lurker Join Date: Jul 2011 Location: France Posts: 90 Thanks: 3 Thanked 65 Times in 30 Posts	On my "small" 100A FOC controller, the STM32 works @ 3.3V, thus I have a 5V cheap linear regulator to supply throttle and brake pedal (with 4.99K/10K divisor before enter in ADC input of the stm32), and some amp op, but the rest is @ 3.3V, even the two isolated current sensor. I use ACS758 (the +/-100A model but there is a +/-150 and +/-200A model) which accept 3.3V and have a ratiometric output (alway VCC/2 @ 0A current) and sensitivity proportionnal to supply voltage, thus it's very well because if the 3.3V is not very precise it's not a problem, the digital result value of the adc will alway represent the same current value even if 3.3V varies over time (effect of temperature for example). Regards