FEBFCM8531_B01H300A Fairchild Semiconductor, FEBFCM8531_B01H300A Datasheet - Page 12

• Manufacturer Part Number: FEBFCM8531_B01H300A
• Description: Power Management IC Development Tools 300W 3Phse PMSM/BLDC Motor Control Board
• Manufacturer: Fairchild Semiconductor
• Type: Motor / Motion Controllers & Driversr

Specifications of FEBFCM8531_B01H300A

• Rohs: yes
• Product: Devolopment Boards
• Input Voltage: 5 V
• Output Voltage: 2.5 V
• Description/function: Processor for motor control that consist of an advanced motor controller
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: -40 C
• Output Current: 29 mA
• For Use With: MCS51

6.
© 2012 Fairchild Semiconductor Corporation
Operation
6.1. Parameter Setting for Sensorless
6.2. Run / Stop
6.3. Forward Rotation / Reverse Rotation
6.4. Speed Control
The firmware matching the properties of the motor included in the evaluation kit have
been programmed into the FCM8531 on the board. In the following two situations, the
motor parameters or MCU programs must be re-written or changed.
This evaluation board with pre-programmed firmware provides the following
functionality: run/stop, forward/reverse rotation, speed control, and current protections. If
additional functions are required, the corresponding program (code) can be developed
based on the included firmware example.
For the details of parameters and AMC libraries, please visit the Fairchild website for
more information:
controller.html.
The SW1 switch controls whether the voltage level is HIGH or LOW at the input P24
(pin 24) of the FCM8531. When SW1 is in ON position, the motor is started. The rotation
speed is controlled by the VR1 variable resistor. When SW1 is in OFF position, all three
phases of the motor drive circuit are disabled, the high- and low-side drivers are turned
off, and the motor is not driven. Note that the rotor might continue to rotate for a while
based on its inertia, depending on its state at the assertion of the OFF command.
The SW2 switch controls whether the voltage level is HIGH or LOW at the P25 input pin
of the FCM8531. A HIGH voltage level at P25 sets clockwise (CW) rotation, while a
LOW voltage level causes the rotor to spin in a counterclockwise (CCW) direction. The
direction of the rotation is related to the order in which the motor’s three-phase wires
connect to the board’s connector. In forward (CW) rotation mode, the evaluation board
drives the PWM signals following the order of U, V, W. In reverse (CCW) rotation
mode, the evaluation board drives the PWM signals following the order of W, V, U. The
actual direction of the motor’s rotation depends on the motor winding and the connection
to the evaluation board.
The VR1 variable resistor is used to adjust the voltage level connected to the ADC0 input
of the FCM8531. The internal ADC of the FCM8351 converts this voltage into a speed
command and controls the duty ratio. Turning VR1 clockwise; the voltage is increased
and the duty ratio become larger, causing the motor speed to increase. Turning VR1
counterclockwise; the voltage is decreased, the duty ratio become smaller, and the
coresponding motor speed is slower.
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
When different motors are used
When using the incuded motor but with a different load
http://www.fairchildsemi.com/applications/motor-control/bldc-pmsm-
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FEBFCM8531_B01H300A • Rev. 1.0.1