<div class="document"> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">采用10cm的usb线连接到设备,获取一个可以延长的usb电流计。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">使用模拟IIC来控制OLED屏幕</p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">* 1、项目功能介绍</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">USB电流计</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*2、项目属性</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;font-size:14px;">不是原创,没有参加过比赛</span></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">* 3、开源协议</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p style="line-height:1.8;">GPL3.0</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*4、实物验证图</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"> </p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/4cqc9XCyF8BzGtFzzpuxRVsBEzwa7P7XZwx2Y6z1.png" alt="4cqc9XCyF8BzGtFzzpuxRVsBEzwa7P7XZwx2Y6z1.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em" style="line-height:1.8;"><img src="//image.lceda.cn/pullimage/A5MNbvuv0RgScloZArwjmple1Qcpk55pszBixzv0.png" alt="A5MNbvuv0RgScloZArwjmple1Qcpk55pszBixzv0.png"></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em" style="line-height:1.8;"> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*5、软件部分</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt"><strong>1.主控</strong></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt">N32G430C8L7 微控制器产品采用高性能 32 位 ARM Cortex™-M4F 内核，集成浮点运算单元（FPU）和数字信号处理（DSP），支持并行计算指令。最高工作主频 128MHz，集成高达64KB片内加密存储Flash，并支持多用户分区权限管理，支持16KB 的嵌入式 SRAM。内置一个内部高速 AHB 总线，两个低速外设时钟总线 APB 及总线矩阵，支持40个可复用 I/Os，提供丰富的高性能模拟接口，包括1个12位 4.7Msps ADC，支持16个外部输入通道和3个内部通道，同时提供多种数字通信接口，包括 4个U(S)ART、2个I2C、2个SPI/I2S、1个CAN 2.0B通信接口。N32G430C8L7 微控制器产品可稳定工作于-40°C 至+105°C的温度范围，供电电压2.4V至3.6V，提供多种功耗模式供用。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt pap-left-indent-1.6em" style="line-height:1.8;">本次案例使用的资源不多，使用内部的时钟已经开源满足设计需求，所以无需外接时钟电路。需要注意的是芯片的每个电源的引脚都需要额外接一个100nF的外接的滤波电容，芯片的1脚需要额外接4.7uf的滤波电容。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt"><strong>二、电压转换</strong></p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt">采用的是最高18v转3.3v的ams1117稳压芯片，最大输出1A，足够单片机消耗。且电路连接较简单，适合本次设计所需。</p> <p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt"><strong>三、电流采样</strong></p> <p>电流采样部分的是INA199B1DCKR电流感应放大器，（也称为电流传感放大器）常用于过流保护、针对系统优化的精密电流测量或闭环反馈电路。该系列器件可在独立于电源电压的–0.3V至 26V共模电压下感应分流电阻器上的电压降。</p> <p> </p> <h3 class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;">*6、BOM清单</h3> <hr class="horizontal-splitline normal-bold-2"><p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt" style="line-height:1.8;"><span style="color:#95a5a6;">软件部分主要是ADC采样和模拟IIC驱动OLED</span></p> </div>