
Motor control demonstration UM0428
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Table 6. Jumpers settings
Name Selection Description
W1
Between 1-2
If sensorless control is set (see W2), it connects motor phase A to MC connector through
R2-R3-R5-R6 feedback resistors. In this case the microcontroller internal comparator is
used to detect the BEMF.
Between 2-3 The external comparator U2A is used to detect the BEMF. If sensorless control is set (see
W2), it connects the output of U2A to MC connector.
Not present Use this setting for sensored control (Tacho, Encoder, Hall)
W2
Between 1-2 It is used for sensorless control. Connects motor phase feedback signal to MC connector.
Between 2-3 It is used for sensored control. Connects the Hall sensor signal or Encoder signal to MC
connector.
W3 Present 3-Shunt setting. It is used to set the correct values for the current amplifier U1B.
Not present 1-Shunt setting. It is used to set the correct values for the current amplifier U1B.
W4
Between 1-2 It is used for sensorless control. Connects motor phase feedback signal to MC connector.
Between 2-3 It is used for sensored control. Connects the Hall sensor signal or Encoder signal to MC
connector.
W5 Not present 1-Shunt setting. It is used to set the correct values for the current amplifier U1B.
Between 2-3 3-Shunt setting. It is used to set the correct values for the current amplifier U1B.
W6 Between 1-2 Sets the voltage supplied to Hall / Encoder Sensors to Vdd_Micro values (see W13).
Between 2-3 Sets the voltage supplied to Hall / Encoder Sensors to +5 V.
W7
Between 1-2
If sensorless control is set (see W4), it connects motor phase B to MC connector through
R29-R30-R32-R33 feedback resistors. In this case the microcontroller internal comparator
is used to detect the BEMF.
Between 2-3 The external comparator U2B is used to detect the BEMF. If sensorless control is set (see
W4), it connects the output of U2B to MC connector.
Not present Use this setting for sensored control (Tacho, Encoder, Hall)
W8 Present 3-Shunt setting. It is used to set the correct values for the current amplifier U1B.
Not present 1-Shunt setting. It is used to set the correct values for the current amplifier U1B.
W9
Between 1-2 It is used for sensorless control. Connects motor phase feedback signal to MC connector.
Between 2-3 It is used for sensored control. Connects the Hall sensor signal or Encoder signal to MC
connector.
W10
Between 1-2 It selects the voltage reference for the comparator U2A, U2B and U2C to detect zero
crossing. The reference VBus/2 is reconstructed using voltage divider from VBus.
Between 3-4
It selects the voltage reference for the comparator U2A, U2B and U2C to detect zero
crossing. The reference VBus/2 is reconstructed using Phase A, Phase B and Phase C
values.
Between 5-6 It selects the voltage reference for the comparator U2A, U2B and U2C to detect zero
crossing. The reference is set using PWM Vref coming from MC connector.