描述
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<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;">注:* 为必填项</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;"><strong><span style="color:#0093e6;">请在报名阶段填写 ↓</span></strong></p>
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<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、项目介绍</h3>
<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功率计,实时显示电流电压以及功率,监控USB输出。</p>
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<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;">本项目为复刻官方快充版案例</p>
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<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、硬件部分</h3>
<p class="paragraph text-align-type-left pap-line-1.3 pap-line-rule-auto pap-spacing-before-3pt pap-spacing-after-3pt"><strong>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>
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<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;"><strong>电流采样电路:</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" style="line-height:1.8;">使用INA199对低端电流进行采样</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;"><img src="//image.lceda.cn/pullimage/CscMCzfLnkUhHpTXssGTSCCoUOsDgQGHC9WVoCaM.png" alt="CscMCzfLnkUhHpTXssGTSCCoUOsDgQGHC9WVoCaM.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" style="line-height:1.8;"><strong>电压采样电路:</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" style="line-height:1.8;">用两个高精度电阻进行分压,将测得电压送入ADC</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;"><strong><img src="//image.lceda.cn/pullimage/tGv0FAsrqOp7B06miGR0NSnfOpSSZb2ILjYmDupH.png" alt="tGv0FAsrqOp7B06miGR0NSnfOpSSZb2ILjYmDupH.png"></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" style="line-height:1.8;"><strong>降压电路:</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" style="line-height:1.8;">参考官方案例使用了BL9342,后续查阅数据手册是发现该芯片输入达到6V时才能稳定输出3.3V,并且EN引脚输入电压不得高于6V,实测5.2V以上时才能稳定驱动OLED,5V输入时测得输出仅为2.2V,需要更换芯片。</p>
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<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、大赛LOGO验证</h3>
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<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;"><img src="//image.lceda.cn/pullimage/0aQI5LuclRYLdZmdmW35RqagjCaAeQGu0yJUdZsQ.png" width="270" height="480" alt="0aQI5LuclRYLdZmdmW35RqagjCaAeQGu0yJUdZsQ.png"><img src="//image.lceda.cn/pullimage/rehKehAq9hHBoQEXs14l1yTBfv891axg7PVcRqBA.png" width="273" height="485" alt="rehKehAq9hHBoQEXs14l1yTBfv891axg7PVcRqBA.png"></p>
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