【经验】FTP-62GMCL163在桌面式票据打印机使用过程中可通过数据选通方式降低峰值电流
本文主要介绍FTP-62GMCL163在桌面式票据打印机使用过程中通过数据选通方式降低峰值电流的应用设计经验。FTP-62GMCL163作为一款热敏打印头机芯,主要是通过热敏打印头加热对应位置的热敏纸,产生打印内容的点阵。其关键技术主要是对打印头的控制,打印选通的控制会影响到打印的灰度和均匀性;而且选通的控制还会影响到产品的峰值电流,峰值电流如果过高会拉低输入电压造成产品的Down机。
FTP-62GMCL163支持三段选通的硬件连接方式(Strobe1~ Strobe3)如果要打印全黑的样张就可以通过控制选通Strobe引脚一次选通或分三段进行选通用来降低峰值电流。有些机芯会提供6段选通的硬件连接方式,但是这样也会增加MCU的资源负担,需要多占用三个I/O口,而且打印头的选通控制一般都是使用PWM方式,这就需要占用MCU的特殊功能引脚,对处理器MCU有了更高的要求。通过固件上的数据选通方式可以实现更精细分的控制而且不增加额外的硬件资源。简单来说就是通过固件算法建立一个Table表,需要打印的数据通过和Table表“与”的方式实现不同的占空比输出。在硬件上Strobe1~ Strobe3的控制可以连接到一个控制引脚,通过固件的方式决定打印头选通的加热区域。实际测试通过数据选通方式打印不同占空比的样张如下图所示:
图1 100%占空比
其中峰值电流在3.1A,均值电流在1.97A。
图2 50%占空比
图2是在50%占空比下的电流波形,其中峰值电流在2.27A,均值电流在1.64A。
图3 12.5%占空比
其中图3是12.5%占空比下的电流波形,峰值电流2.11A,均值电流1.1A。通过数据选通方式可以实现打印头不同占空比的控制,而且还可以实现更精细的控制相比通过硬件段选的方式更灵活。另一方面的优势就是占用MCU资源少,空闲出来的资源可以分配给其他功能模块使用。大家在使用FTP-62GMCL163机芯的时候也可以考虑使用数据选通的方式来控制打印头的分段选通。
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