Drive brushless DC motor based on Ti drv10970

Preface

I took over a project in the laboratory before , Need to use TI Of DRV10970 Chip to drive brushless DC motor with Hall feedback , The motor has been switched on these days , So write an article to record .

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About the drive mode of Brushless DC motor , I don't want to go into details ,CSDN There are a lot of them , I'll just say based on TI Of DRV10970 Chip to drive brushless DC motor .

One 、TI DRV10970

1. Introduce

DRV10970 It is an integrated three-phase BLDC Motor driver , Suitable for household appliances 、 Cooling fans and other general motor controls application . The device has built-in intelligent features , And it has a small shape and simple pin distribution structure , It not only reduces the design complexity 、 The circuit board space is saved , And it also reduces the system cost . The integrated protection function improves the robustness and reliability of the system .
This means that we don't need to process Hall signals , The chip will automatically process the hall signal , We just need to output PWM And setting some pins can drive the brushless DC motor .

2. Pin Introduction

name	describe
CPN	Charge pump switching node,Connect a 0.1-µF X7R capacitor rated for VM between CPN and CPP
CPP	Charge pump switching node,Connect a 0.1-µF X7R capacitor rated for VM between CPN and CPP
VCP	Charge pump output,Connect a 16-V, 1-µF ceramic capacitor to VM
GND	Device ground,Must be connected to board ground
VINT	Integrated regulator output,Integrated regulator (typical voltage 5 V) mainly for internal circuits; Provide external power for less than 20 mA. Bypass to GND with a 10-V, 2.2-µF ceramic capacitor
VM	Power supply
CS	Current limit setting pin
DAA	Drive angle adjustment configuration pin,Low: 10° drive angle adjustment,High: 5° drive angle adjustment,Floating: adaptive drive angle adjustment
FG	Frequency indication pin,Open drain Electrical Frequency Output pin. One toggle per electrical cycle. Requires an external pull-up of 3.3-kΩ.
FR	Motor direction control,Direction Control Input.When low, phase driving sequence is U → V → W ( U phase is leading V phase by 120°).When high, the phase driving sequence is U → W → V.
BRKMOD	Brake mode setting,Low: Coasting mode (phases are tri-stated),High: Brake mode (phases are driven low)
PWM	Variable duty cycle PWM input for speed control
RD	Lock indication pin
RETRY	Auto retry timing configure
CMTMOD	Commutation mode setting,Low: Sinusoidal operation mode with 0° Hall placement,High: Sinusoidal operation mode with 30° Hall placement,Floating: Trapezoidal operation mode with 30° Hall placement

We only need to pay special attention to a few of the above pins , Including pulse width modulation (PWM) Input （ Speed command ）、FG Output （ Speed feedback ）、FR Input （ Forward and reverse control ） as well as RD Output （ Motor lock indication ）.
FG and RD yes DRV10970 Feedback to MCU The signal of
CMTMOD Is the setting mode , Generally will CMTMOD Setting low level is sinusoidal mode 0° Place hall element ,
BRKMOD Is the braking mode setting , take BRKMOD The pin is set to low level , Even if BRKMOD The motor set to high level will not brake , Because this pin is used to set the braking mode , Instead of directly braking the motor , Only power off or will PWM Set to 0 Before you can brake .
DAA Is the angle setting of the drive motor , Set it to float , Floating is the adaptive angle to drive the motor
PWM It's the connection MCU Of PWM Output pins ,PWM The frequency of is 15Khz-100Khz.

Two 、 Use steps

1. Program

So it's using DRV10970 when , We need to PWM,FR,BM,CM,DAA Just set it up , I use two chips here to drive two motors

void PWM_Configuration(u16 arr,u16 pre)
{
    
	GPIO_InitTypeDef GPIO_InitStructure;
	TIM_TimeBaseInitTypeDef	TIM_TimeBaseStructure;
	TIM_OCInitTypeDef TIM_OCInitStructure;
// TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
	
	RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC |RCC_AHB1Periph_GPIOD, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM12, ENABLE);
	
	GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_TIM12); //PB14  Reuse  TIM12
	GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_TIM12); //PB14  Reuse  TIM12
	
	// PWM
	GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_14 | GPIO_Pin_15;		 //
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // Multiplexing push pull output 
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // Pull up 
	GPIO_Init(GPIOB,&GPIO_InitStructure); // initialization  PB14

	//M1
	//GPIO DAA  In the air  M2 PD14--DAA
	GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8 | GPIO_Pin_14 ;	
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;// Normal input mode 
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;// Floating space 
	GPIO_Init(GPIOD, &GPIO_InitStructure);// initialization GPIOD
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 ;	 //GPIO_Pin_11 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;// Normal output mode 
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;// Push pull output 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;// Pull up 
	GPIO_Init(GPIOB, &GPIO_InitStructure);// initialization GPIOD
	
			//GPIO M1--PD12--CM
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_15 ;	 //M2 PD15--FR
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;// Normal output mode 
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;// Push pull output 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;// Pull up 
	GPIO_Init(GPIOD, &GPIO_InitStructure);// initialization GPIOD
	
				//GPIO M2--PA12--CM M2-PA11-BM
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12 ;	 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;// Normal output mode 
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;// Push pull output 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;// Pull up 
	GPIO_Init(GPIOA, &GPIO_InitStructure);// initialization GPIOD
	
	//GPIO //FG and RD all feedback
	GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_9|  GPIO_Pin_13;	// Input 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;// Normal input mode 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//
	GPIO_Init(GPIOD, &GPIO_InitStructure);// initialization GPIOD
	
		//GPIO // M2--PC8--RD M2--FG--PC14
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_14;	// Input 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;// Normal input mode 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//
	GPIO_Init(GPIOC, &GPIO_InitStructure);// initialization GPIOD
	
	//GPIO // CMTMOD--PD10 
	GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_10|GPIO_Pin_11;	// Input 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;// Normal input mode 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;//
	GPIO_Init(GPIOD, &GPIO_InitStructure);// initialization GPIOD
	
		
	TIM_TimeBaseStructure.TIM_Period= arr-1;				
	TIM_TimeBaseStructure.TIM_Prescaler= pre-1;			
	TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
	TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;		
	TIM_TimeBaseInit(TIM12,&TIM_TimeBaseStructure);	 //TIM12
	 
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;				
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;	
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;		

// TIM_DeInit(TIM12);
						
	TIM_OC1Init(TIM12, &TIM_OCInitStructure);// Initialize peripherals TIM1 OC1--OC4
	TIM_OC2Init(TIM12, &TIM_OCInitStructure);
	TIM_OC3Init(TIM12, &TIM_OCInitStructure);
	TIM_OC4Init(TIM12, &TIM_OCInitStructure);

	TIM_OC1PreloadConfig(TIM12, TIM_OCPreload_Enable);// Enable preload register 
	TIM_OC2PreloadConfig(TIM12, TIM_OCPreload_Enable);
  TIM_OC3PreloadConfig(TIM12, TIM_OCPreload_Enable);
	TIM_OC4PreloadConfig(TIM12, TIM_OCPreload_Enable);

	TIM_ARRPreloadConfig(TIM12,ENABLE);			

	TIM_Cmd(TIM12, ENABLE);	
	
	//M1
	// PD12--CM
	GPIO_ResetBits(GPIOD, GPIO_Pin_10 );//PD10---FR PD11---BM
	
	GPIO_SetBits(GPIOD, GPIO_Pin_12 );// PD12--CM
	
	//M2
	GPIO_ResetBits(GPIOA, GPIO_Pin_11 );// PA11--BM
	GPIO_SetBits(GPIOA, GPIO_Pin_12 );// PD12--CM

}

3、 ... and . How to judge when the chip is damaged

When VM for 12V When electricity is on , If VINT No, 5V Output , It can be considered that the chip is broken