Hi, Mike,
If you want to control TWO BLDC motor with hall sensor using one processor, you have to select the processor which has enough resource to control two BLDC.
requirements:
two independent PWM module with 6 PWM channels for each PWM module
Each BLDC moptor output 3 Hall signal, there are 6 hall signal totally.
Tow PIT so that you can generate fixed period interrupt for speed control.
two ADC module to test DC voltage or shunt current.
The Kv3x has FTM0/FTM3 with 8 channels each, FTM1/FTM2 with 2 channels each. Because FTM1/FTM2 are used to connect hall signals, the hall signals needs 6 FTM channels, but FTM1/FTM2 can only give 4 channels.
The KV4x has one PWMA, FTM0 with 8 channels, FTM3 with 8 channels, FTM1 with two channels. You can use PWMA and FTM0 to generate PWM signal to control two BLDC, use FTM1 and FTM3 to connect to 6 hall signals, it is oklay.
KV5x is okay to control two BLDC.
Regarding BLDC control example with hall based on Kinetis family, I suggest you download an4776 and an4776SW.zip(BLDC example code with hall).
http://cache.nxp.com/docs/en/application-note/AN4776.pdf?fsrch=1&sr=8&pageNum=1
Hope it can help you
BR
Xiangjun rong
