MSP430FR6972如何做到液晶驱动功耗最低?

2019-3-15 16:49

FR6972 LCD显示功耗近20UA，FR4133  LCD显示功耗只有6UA;
电路差不多，区别就在R23/LCDCAP 接4.7uF，而FR4133 接0.1uF
VSS--4.7uF -| R23/LCDCAP
VSS--0.1uF -|R03
VSS--0.1uF -|R13
VSS--0.1uF -|R23
程序设置有错吗？
void CLOCK_Config()  // MSP430FR6972
{
            PJSEL0 = BIT4 | BIT5;                // For LFXT
      // Configure LFXT 32kHz crystal
  CSCTL0_H = CSKEY >> 8;                // Unlock CS registers
  CSCTL4 &= ~LFXTOFF;                   // Enable LFXT
  do
  {
CSCTL5 &= ~LFXTOFFG;                // Clear LFXT fault flag  清除 LFXT 失效标志
SFRIFG1 &= ~OFIFG;
  } while (SFRIFG1 & OFIFG);             // Test oscillator fault flag  如果失效标志存在
  CSCTL0_H = 0;                         // Lock CS registers
}

void LCD_Config(void)  // MSP430FR6972
{
      //Initialize LCD segments 0 - 15;  18 - 21; 24 ; 28 - 30
  LCDCPCTL0 = 0xFFFF;
  LCDCPCTL1 = 0x713C;
  LCDCPCTL2 = 0x0000;                               //设置LCD管脚 L0 - L15; L18 - L21; L24 ; 28 - 30 pins selected

  // Initialize LCD_C
  // ACLK, Divider = 1, Pre-divider = 16; 4-pin MUX
  LCDCCTL0 = LCDDIV__1 | LCDPRE__16 | LCD4MUX | LCDLP;

  // VLCD generated internally,
  // V2-V4 generated internally, v5 to ground
  // Set VLCD voltage to 2.60v
  // Enable charge pump and select internal reference for it
  LCDCVCTL = VLCD_2_96 | VLCDREF_0 | LCDCPEN;

  LCDCCPCTL = LCDCPCLKSYNC;             // Clock synchronization enabled

  LCDCMEMCTL = LCDCLRM;                // Clear LCD memory

  //Turn LCD on
  LCDCCTL0 |= LCDON;  // 打开LCD
}

2019-3-15 16:49

void CLOCK_Config()// MSP430FR4133
{
      P4SEL0 |= BIT1 + BIT2;                // Select pin4.1 pin4.2 as crystal function
      do
      {
            CSCTL7 &= ~(XT1OFFG + DCOFFG);          // Clear XT1 and DCO fault flag  清除 XT1 DCO 失效标志
            SFRIFG1 &= ~OFIFG;
      }while (SFRIFG1 & OFIFG);                   // Test oscillator fault flag  如果失效标志存在

      CSCTL4 = SELA__XT1CLK;                                     // IMPORTANT. Select ACLK = XT1 = 32768Hz
}

void LCD_Config(void) // MSP430FR4133
{
      uint8_t ui8Cnt;
      uint8_t *pLCD = (uint8_t *)&LCDM0;

      for (ui8Cnt = 13; ui8Cnt > 0; ui8Cnt--)                      // Clear LCD memory
      *pLCD++ = 0x00;                                     // CLR LCD

      SYSCFG2 |= LCDPCTL;                            // R13/R23/R33/LCDC1/LCDC2 pins selected  设置 LCD功耗

      LCDPCTL0 = 0xFFFF;
      LCDPCTL1 = 0x01FF;                                     //设置 LCD管脚 L0~L24 pins selected

      LCDVCTL = LCDSELVDD + LCDCPEN;             // Mode 2 设置降低LCD 功耗片上电荷泵

      LCDCSSEL0 = 0x000F;                                     // 设置公共极  COM0~3
      LCDCSSEL1 = 0x0000;

  LCDM0 = 0x21;                      // L0 = COM0, L1 = COM1
  LCDM1 = 0x84;

      LCDCTL0 |= LCD4MUX + LCDLP + LCDON;       // 打开LCD: 4-mux 模式
}
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MSP430FR6972如何做到液晶驱动功耗最低?

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