MDX61B0110-5A3-4-00 用戶自行設計底板時候必須留出串口部分電路,便于調試;
用戶自行設計底板時候必須留出撥碼開關部分電路,便于程序燒寫;
用戶自行設計底板時候注意上電順序,以防閂鎖效應的發生損壞CPU(具體設計參考3.5.1底板電源)。
一般情況下,除最小系統外建議連接上一些外部設備,例如調試串口,否則用戶無法判斷系統是否啟動。做好這些后,再在此基礎上根據飛凌提供的核心板默認接口定義來添加用戶需要的功能。iMX6ULL系列核心板引腳定義可聯系飛凌嵌入式客服索取。
硬件設計指南
1、boot配置方式
i.MX6ULL有多種燒寫和啟動方式,在系統上電或復位后,通過讀取系統啟動配置引腳的狀態,選擇不同的燒寫和啟動方式。
用戶自己設計底板時,一定要加上這部分電路,具體配置方式請參考開發板底板原理圖及本手冊Boot配置章節。同時提醒用戶注意,如果同時需要使用SD卡燒寫和eMMC啟動兩種模式,則一定要加上對LCD_DATA11引腳的控制,否則,可以根據需要,對LCD_DATA11做固定電平處理。
2、PMIC_ON_REQ驅動能力問題
底板上的GEN_5V和GEN_3.3V都是通過PMIC_ON_REQ引腳的控制來獲得的,PMIC_ON_REQ引腳的電流驅動能力太弱,需要使用電壓控制型開關元件,開發板中使用的是N溝道場效應管AO3416,請參考底板電源電路設計。
用戶自己設計底板時,需要注意IIC總線必須加上拉電阻,否則可能導致IIC總線設備不能使用。目前底板上引出的兩個IIC總線均通過1.5K電阻上拉到了3.3V。
4、調試中,出現USB1-1錯誤
用戶使用USB接口時,需要把USB_OTG1_VBUS和USB_OTG2_VBUS連接到5V,否則會報錯。目前底板上,USB_OTG2_VBUS這個引腳通過一個0Ω電阻,連接到了GEN_5V上。
5、CAN電路RX引腳輸出電平
目前開發板默認使用的CAN收發器芯片是TJA1040T,該芯片的RX端輸出電平為5V,而CPU該引腳的電平為3.3V,為不影響CPU內部的3.3V電源,需要在芯片的RX端對地串聯電阻分壓,再接入CPU 。請參考CAN部分電路。
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MDX61B0110-5A3-4-00
PTQ-PDPMV1
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