msp430單片機控制的電動牙刷方案 DRV8850RGY+SN74LVC1G80DCK

ID:1073328 · 發(fā)表于 2023-4-22 09:59

電動牙刷控制器采用了德州儀器 (TI) 低電壓 H 橋電機驅(qū)動器與集成式 LDO 電壓穩(wěn)壓器和超低功耗微控制器 (MCU)，旨在展示電池供電型電動牙刷的全面實施方案。
特性
• 電池電壓范圍從 2V 到 5.5V
• 提供 5A 連續(xù)電流和 8A 峰值驅(qū)動電流
• PCB 外形小巧：43.2 x 14.6mm
• 組件數(shù)量少，可降低成本
• 在關(guān)閉時電池漏電流小于 50nA
電動牙刷控制器電路框圖：
Altium Designer畫的原理圖和PCB圖如下：(51hei附件中可下載工程文件)

單片機源程序如下:
#include "msp430.h"

// Port 1 output definitions
#define IN1H          BIT7 // P1.7
#define IN1L          BIT2 // P1.2
#define IN2H          BIT5 // P1.5
#define IN2L          BIT6 // P1.6

// Define output PWM waveform parameters
#define t_OFF          750       // Time that both outputs maintain low; 5*150
#define t_ON          1350 // Time that one output maintains high; 9*150

volatile unsigned int count;

int main(void)
{
// Setup CLKs

// Stop watchdog timer
WDTCTL = WDTPW + WDTHOLD;

// 1MHZ DCO
BCSCTL1 = CALBC1_1MHZ;
DCOCTL = CALDCO_1MHZ;

// Configure all GPIO with pulldowns
   P1REN  = BIT7 + BIT6 + BIT5 + BIT4 + BIT3 + BIT2 + BIT1 + BIT0;
   P2REN  = BIT7 + BIT6;

   // Set the four GPIO pins as OUTPUT
   P1DIR = 0xE4;

   // Set default GPIO settings
   P1OUT  = 0x00;
   P2OUT  = 0x00;

// Setup Timer
TACCTL0= CCIE;          // Enable Interrupts on Timer
TACCR0 = 150-1;          // Number of cycles in the timer
TACTL = TASSEL_2;       // Use SMCLK as source for timer
TACTL |= MC_1;          // Use UP mode timer

// Enters low power mode and enables interrupt
__bis_SR_register(LPM0_bits + GIE);

}    // main

#pragma vector = TIMERA0_VECTOR
/*       |    ____       |          |                |
*    IN1H | __|    |_______ |          |                |
*       |             ____ |          | ____       |
*    IN1L | __________|    ||       OUT1|__| |________|
*       |             ____ |          |          ____ |
*    IN2H | __________|    ||       OUT2|__________| ||
*       |    ____       |          |                |
*    IN2L | __|    |________|          |                |
*/
__interrupt void CCR0_ISR(void) {

count++;                      // Increment count upon every interrupt

if       (count == 5)          // 750 uS
         P1OUT = IN1H + IN2L; // OUT1 high

else if (count == 14)          // 2100 uS
         P1OUT = IN1L+IN2L;       // Slow decay

   else if (count == 19)          // 2850
            P1OUT = IN2H + IN1L; // OUT2 high

else if (count == 28) {       // 4200
         P1OUT = IN1L+IN2L;       // Slow decay
         count = 0;
}
else {
      // Do nothing
      }
}//interrupt

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msp430單片機控制的電動牙刷方案 DRV8850RGY+SN74LVC1G80DCK

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