STM8/128-MCKIT STMicroelectronics, STM8/128-MCKIT Datasheet - Page 14

• Manufacturer Part Number: STM8/128-MCKIT
• Description: EVAL KIT MOTOR CONTROL STM8S
• Manufacturer: STMicroelectronics
• Series: STM8Sr

Specifications of STM8/128-MCKIT

• Main Purpose: Power Management, Motor Control
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: STM8S2xx
• Primary Attributes: Brushless DC (BLDC) & AC Induction (ACIM) Motors
• Secondary Attributes: Joystick & LCD User Interface
• Processor To Be Evaluated: STM8S
• Data Bus Width: 8 bit
• Operating Supply Voltage: 2.95 V to 5.5 V
• Silicon Manufacturer: ST Micro
• Silicon Core Number: STM8
• Features: Motor Control Applications, The Inverter Is Driven Using The Space Vector PWM Modulation Technique
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 497-10032

BLDC daughterboard MB843
4
4.1
Note:
Note:
Note:
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BLDC daughterboard MB843
Features
The BLDC daughterboard MB843 is an extension of the STM8/128-EVAL evaluation board
MB631 required to implement the BLDC drive.
It includes:
The board has been designed to be compatible with the voltage level applicable to the
power board MB459B (“<35V only” or “HIGH VOLTAGE”).
The BEMF detection network allows the following strategies of BEMF sampling:
For more details see the STM8S three-phase BLDC software library v1.0 (UM0708).
For applications that require a limited range of motor speed, for example if the ratio between
maximum and minimum speed is below 4, it is possible to replace the BEMF detecting
network with a simple resistive voltage divider.
The current regulation/regulation network is used to adapt the signal to perform the current
control in the BLDC drive. Control is made possible by a special characteristic of the STM8
microcontroller. See for more details the STM8S three-phase BLDC software library v1.0
(UM0708).
The neutral voltage reconstruction network is used to reconstruct the neutral voltage (also
called star point) of the motor in order to perform the BEMF sampling during the on time.
Two strategies of the neutral point reconstruction are implemented by the board:
It is possible to configure either method (see
first is implemented by the firmware.
Even if bus partitioning is also performed in the power board MB459B, the partitioning
performed by the MB843 makes use of a voltage partitioning that allows a better resolution
in the neutral voltage reconstruction.
The board is easily configurable to run the BLDC drive in sensorless mode, or to use the
Hall sensors as position/speed feedback.
A BEMF detection network,
A current regulation/regulation network,
A neutral voltage reconstruction network.
BEMF sampling during off time (ST patented method),
BEMF sampling during on time,
Dynamic method based on the duty cycle applied.
Bus voltage partitioning,
Star point reconstruction starting from the motor phases.
Doc ID 15774 Rev 2
Section 4.3: Jumper
configuration) but only the
UM0709