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FR6972液晶驱动



关于液晶驱动有两个问题如下:

(1)、LCDCAP这个引脚,如果使用内部电压源,该引脚怎么连接,悬空还是需要接地?看到手册上是不建议悬空的,在产品的设计中将此脚悬空液晶显示正常,想了解一下将此管脚悬空以后会不会存在什么隐患?

(2)、在第一版的产品设计中使用的是外部液晶驱动,R33、R23、R13分别接有1M电阻分压,如下图;现在选用内部液晶驱动时,不改变该设计的BOM,该如何设计?另外关于几个寄存器的配置如下,帮忙看下是否配置合适:

LCDCCTL0 &= ~LCDON;

LCDCCTL0 = LCD4MUX + LCDDIV_31 + LCDPRE_1 + LCDLP;

LCDCPCTL0 = 0XFFFF;

LCDCPCTL1 = 0X000F;

//LCDCPCTL1 = LCDREXT + R03EXT + LCDEXTBIAS;

LCDCCTL0  | = LCDON; 

  • 关于LCDCAP您可以看一下   给出的说明

    DATASHEET内也有相关说明: 

    If the internal charge pump of the LCD module is used, the externally provided capacitor on the LCDCAP pin should be as close as possible to the MCU. The capacitor should be connected to the device using a short and direct trace and also have a solid connection to the ground plane that supplies the VSS pins of the MCU.

  • Hi Susan:
    谢谢您。我这里只是用了内部的偏置电压源,但charge pump 没有使能。这个时候没找到LCDCAP这个管脚的设置方法。还请帮忙再看下谢谢。