S08SU16-EVK

Document Number: AN5394 NXP Semiconductors Application Notes Rev. 0, 02/2017 Sensorless BLDC Control for MC9S08SU16- based ESC Contents 1. Introduction ........................................................................ 1 1. Introduction 2. MCU Peripherals ............................................................... 2 2.1. Timer ...................................................................... 3 This application note describes the design of a 2.2. Analog configuration .............................................. 5 sensorless BLDC control for ESC based on NXPs 2.3. Others...................................................................... 6 3. Interrupts ............................................................................ 7 MC9S08SU16. 3.1. Over-current fault interrupt ..................................... 7 3.2. Over-voltage fault interrupt .................................... 8 The drone ESC is gradually and widely used in peoples 3.3. MTIM interrupt ....................................................... 9 daily life. It brings great help to the dull, dirty, and 3.4. FTM0CH0 input capture interrupt ........................ 10 dangerous work. 3.5. FTM0CH1 output compare interrupt .................... 11 3.6. PWM reload interrupt ........................................... 12 This application note focuses on the design of sensorless 4. Software Description........................................................ 13 BLDC control for ESC using MC9S08SU16. The 4.1. System concept ..................................................... 13 4.2. State machine ........................................................ 14 document includes: 4.3. OPENLOOP ......................................................... 16 4.4. Zero-crossing detection and commutation ............ 17 MCU peripherals 5. Hardware Description ...................................................... 18 Interrupts 5.1. Schematic .............................................................. 18 5.2. Hardware board..................................................... 19 Software description 6. Application Operation ...................................................... 20 Hardware setup 6.1. FreeMASTER installation on PC or notebook ...... 20 6.2. Establishing connection between PC and embedded Application introduction application ........................................................................... 20 6.3. Application platform ............................................. 22 6.4. Microcontroller usage ........................................... 23 7. References ........................................................................ 23 8. Revision History .............................................................. 23 2016 NXP B.V. MCU Peripherals 2. MCU Peripherals MC9S08SU16 represents very low-cost portfolio of S08 MCUs with peripherals modules dedicated for motor control applications. The typical application segment includes BLDC sensor or sensorless motor control applications. The key features of the MC9S08SU16 device are as follows: 40-Mhz S08 core 768-bytes SRAM, 16-KB program flash memory Voltage range: 4.5 V to 18 V 5 V input/output for logical I/O One I2C module supporting SMbus communications interface One SCI module Two 12-bit ADCs with up to 8 channels Analog comparator with up to 4 inputs and internal 6-bit DAC High voltage GDU (4.5 V - 18 V) Two 16-bit pulse width timers (PWT) Two programmable delay block (PDB) One 16-bit FTM One 16-bit modulo timer (MTIM) One 16-bit 6-channel PWM Up to 17 GPIOs Windowed COP with multiple clock sources (watchdog) Inter-peripheral Crossbar Switch (XBAR) Cyclic redundancy check(CRC) Temperature range (ambient): -40C to 105C Figure 1 shows the overview diagram of the MC9S08SU16 device. Sensorless BLDC Control for MC9S08SU16-based ESC, Application Notes, Rev. 0, 02/2017 2 NXP Semiconductors