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MOTIX™ Drivers

User22801
New Contributor
Rotation from HS1 to LS2:
1. SPI FRAME: 0b 1100 1101 0000 0000 0000 0110
– HB1MODE = 10b HS1 ON
– HB2MODE = 01b LS2 ON
2. SPI FRAME: 0b 1101 1101 0000 0000 0000 0001
– PWM1EN = 1b PWM1 enabled
– PWM1_HB = 000b PWM mapped to HB1

Brake before the direction change:
1. SPI FRAME: 0b 1100 1101 0000 0000 0000 0100
– HB1MODE = 00b HS1 OFF
– HB2MODE = 01b LS2 ON

2. SPI FRAME: 0b 1101 1101 0000 0000 0000 0000
- PWM1EN = 0b – PWM disabled

3. SPI FRAME: 0b 1100 1101 0000 0000 0000 0101
– HB1MODE = 01b LS1 ON
– HB2MODE = 01b LS2 ON

Rotation from HS2 to LS1:
1. SPI FRAME: 0b 1100 1101 0000 0000 0000 1001
– HB1MODE = 01b LS1 ON
– HB2MODE = 10b HS2 ON

It is possible to omit the Brake step.
In this case, one has to be aware that on the direction change Back EMF voltage will be added (with the same polarity) to the supply voltage. This will result in double the inrush current we observed at switch-on of the original direction (HS1-LS2). This means that the external circuitry and MOSFETs need to be dimensioned accordingly.
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