ESP32-DOWD-V3 是集成 2.4 GHz Wi-Fi 和藍(lán)牙雙模的單芯片方案，采用臺積電 (TSMC) 低功耗 40 納米工藝，具有超高的射頻性能、穩(wěn)定性、通用性和可靠性，以及超低的功耗，滿足不同的功耗需求，適用于各種應(yīng)用場景。
應(yīng)用
• 智能家居
• 工業(yè)自動化
• 醫(yī)療保健
• 消費(fèi)電子產(chǎn)品
• 智慧農(nóng)業(yè)
• POS 機(jī)
• 服務(wù)機(jī)器人
• 音頻設(shè)備
• 通用低功耗 IoT 傳感器集線器
• 通用低功耗 IoT 數(shù)據(jù)記錄器
• 攝像頭視頻流傳輸
• 語音識別
• 圖像識別
• SDIO Wi-Fi + 藍(lán)牙網(wǎng)卡
• 觸摸和接近感應(yīng)
2. 硬件原理圖設(shè)計
ESP32 系列芯片的核心電路只需要 20 個左右的電阻電容電感、1 個無源晶振及 1 個 SPI flash 組成。為了能夠更好地保證 ESP32 系列芯片的工作性能，本章將詳細(xì)介紹 ESP32 系列芯片的原理圖設(shè)計。ESP32 系列芯片的核心電路圖如圖 1 所示
四線 3.3 V 內(nèi)部 flash 核心電圖
模擬電源
ESP32 系列芯片的 pin1 VDDA、pin3 VDD3P3、pin4 VDD3P3、pin43 VDDA 及 pin46 VDDA 為模擬電源管腳，工作電壓范圍為 2.3 V ~ 3.6 V 。該部分電源需要注意的是當(dāng) ESP32 系列芯片工作在 TX 時，瞬間電流會加大，往往引起電源的軌道塌陷。所以在電路設(shè)計時建議在電源走線上增加一個 10 µF 電容，該電容可與 0.1 µF 電容搭配使用。另外，在靠近兩個VDD3P3 管腳處還需添加 LC 濾波電路，用于抑制高頻諧波，同時請注意該電感的額定電流最好在 500 mA 及以上。其余電源管腳請參考圖 6 放置相應(yīng)的去耦電容。
RTC 電源
ESP32 系列芯片的 pin19 VDD3P3_RTC 為 RTC 和模擬電源管腳，建議在電路中靠近該電源管腳處添加 0.1 µF去耦電容。因?yàn)樵撾娫床粌H僅是 RTC 電源，因此不可以作為備用電源單獨(dú)供電。
觸摸傳感器方案：
ESP32-Sense KitESP32-Sense Kit 開發(fā)套件用于評估和開發(fā) ESP32 觸摸傳感器功能。評估套件包含一個主板和若干子板，主板包含顯示單元，主控單元，調(diào)試單元；子板的觸摸電極的形狀和排列方式多樣，包括線性滑條、矩陣按鍵、彈簧按鍵、輪式滑條等，可以滿足不同的使用場景。用戶也可以自行設(shè)計子板以滿足特殊的使用場景。ESP32-Sense Kit 開發(fā)套件如圖所示：
ESP-WROOM-02-N2
ESP-WROOM-02U-N4
ESP32-D0WD
ESP32-D0WDQ6-V3
ESP32-D0WDQ6
ESP32-D0WDR2-V3
ESP32-U4WDH
ESP32-S0WD
ESP32-MINI-1-N4
ESP32-MINI-1U-N4
ESP32-SOLO-1-N4
ESP32-SOLO-1-N16
ESP32-WROOM-32-N8
ESP32-WROOM-32-N16
ESP32-WROOM-32E-N4R2
ESP32-WROOM-32E-N16R2
ESP32-WROOM-32D-N8
ESP32-WROOM-32D-N16
ESP32-WROOM-32D-H4
ESP32-WROOM-32UE-N4
ESP32-WROOM-32UE-N4R2
ESP32-WROOM-32UE-N8R2
ESP32-WROOM-32UE-N16R2
ESP32-WROOM-32U-N4
ESP32-SOLO-1-N4
ESP32-SOLO-1-N16
ESP32-WROOM-32-N8
ESP32-WROOM-32-N16
ESP32-WROOM-32E-N4R2
ESP32-WROOM-32E-N16R2
ESP32-WROOM-32D-N8
ESP32-WROOM-32D-N16
ESP32-WROOM-32D-H4
ESP32-WROOM-32UE-N4
ESP32-WROOM-32UE-N4R2
ESP32-WROOM-32UE-N8R2
ESP32-WROOM-32UE-N16R2
ESP32-WROOM-32U-N4
ESP32-WROOM-32U-H4
HM5149NL
ESP32-WROVER-IE-N4R8
ESP32-WROVER-E-N4R2
ESP32-WROVER-E-N16R2
ESP32-WROVER-IE-N4R2
ESP32-WROVER-IE-N8R2
ESP32-WROVER-IE-N16R2
ESP32-WROVER-B-N4R8
ESP32-WROVER-IB-N4R8
ESP32-WROVER-IB-N8R8
ESP32-WROVER-N4R8
ESP32-WROVER-I-N4R8
ESP32-PICO-V3
ESP32-C3FH4
ESP32-C3-MINI-1U-N4
ESP32-C3-MINI-1U-H4
ESP32-C3-WROOM-02-N4
ESP32-C3-WROOM-02-N8
ESP32-C3-WROOM-02-N16
ESP32-C3-WROOM-02-H4
ESP32-C3-WROOM-02U-N4
ESP8685H2
ESP8685H4
ESP32-S3-WROOM-1U-N16
ESP32-S3-WROOM-1U-H4
ESP32-S3-WROOM-1U-N8R8
ESP32-S3-WROOM-1U-N16R8
ESP8684H2
ESP8089
ESP8285H16
ESP32-S3-WROOM-1-N16R8
ESP32-S3-WROOM-1-N8
ESP32-S3-WROOM-1-N16
ESP32-S3-WROOM-1-H4
ESP32-S3-WROOM-1-N4R2
ESP32-S3-WROOM-1-N16R2
ESP32-S2-MINI-1-N4R2
ESP32-S2FN4R2
ESP32-WROOM-32UE-N8
ESP32-C3-MINI-1-H4
ESP32-WROOM-32U-N16
ESP32-WROVER-E-N8R2
ESP32-S3-WROOM-1U-N8
ESP32-MINI-1U-H4
ESP32-S3-MINI-1-N8
ESP8684-MINI-1-H2
ESP32-S3FH4R2
ESP32-S3-WROOM-1-N4R2
ESP-WROOM-02D-N4
ESP32-S3-MINI-1U-N8
ESP8266EX
ESP32-WROVER-E-N4R8
ESP32-WROVER-IB-N16R8
ESP8684-WROOM-06C-H2(M)
ESP32-S3-WROOM-1U-N4R2
ESP32-WROOM-32D-N4
ESP32-WROVER-E-N16R8
ESP32-S3-WROOM-1-N8R2
ESP-WROOM-02-N4
HX1198FNL
ESP8685-WROOM-01-H2
ESP8685-WROOM-03-H2
ESP8685-WROOM-04-H2
ESP8685-WROOM-05-H2
ESP8685-WROOM-06-H2
ESP8685-WROOM-07-H2
ESP8685-WROOM-01-H4
ESP8685-WROOM-03-H4
ESP8685-WROOM-04-H4
ESP8685-WROOM-05-H4
ESP8685-WROOM-06-H4
ESP8685-WROOM-07-H4
ESP8684-WROOM-03-H2
ESP8684-WROOM-05-H2
ESP8684-WROOM-07-H2
ESP8684-WROOM-01C-H2
ESP8684-WROOM-04C-H2
ESP8684-WROOM-06C-H2
ESP8684-WROOM-03-H4
ESP8684-WROOM-05-H4
ESP8684-WROOM-07-H4
ESP8684-WROOM-01C-H4
ESP8684-WROOM-04C-H4
ESP8684-WROOM-06C-H4
ESP8684-MINI-1-H2(S)
ESP8684-MINI-1U-H2(S)
ESP8684-MINI-1U-H4(S)
ESP8684-WROOM-02C-N2
ESP8684-WROOM-02C-N4
ESP8684-WROOM-02C-H2
ESP8684-WROOM-02C-H4
ESP8684-WROOM-02UC-N2
ESP8684-WROOM-02UC-N4
ESP8684-WROOM-02UC-H2
ESP8684-WROOM-02UC-H4
ESP8684-MINI-1-H4
ESP8684-MINI-1U-H2
ESP8684-MINI-1U-H4
ESP8684-WROOM-01C-H2(M)
ESP8684-WROOM-01C-H4(M)
ESP8684-WROOM-02C-N2(M)
ESP8684-WROOM-02C-N4(M)
ESP8684-WROOM-02C-H2(M)
ESP8684-WROOM-02C-H4(M)
ESP8684-WROOM-02UC-N2(M)
ESP8684-WROOM-02UC-N4(M)
ESP8684-WROOM-02UC-H2(M)
ESP8684-WROOM-02UC-H4(M)
ESP8684-WROOM-03-H2(M)
ESP8684-WROOM-03-H4(M)
ESP8684-WROOM-04C-H2(M)
ESP8684-WROOM-04C-H4(M)
ESP8684-WROOM-05-H2(M)
ESP8684-WROOM-05-H4(M)
ESP8684-WROOM-06C-H4(M)
ESP8684-WROOM-07-H2(M)
ESP8684-WROOM-07-H4(M)
ESP32-S3
ESP32-S3R8
ESP32-S3R8V
ESP32-S3-MINI-1-N4R2
ESP32-S3-MINI-1U-N4R2
ESP32-S3-WROOM-1-N4
ESP32-S3-WROOM-1U-N4
ESP32-D0WD-V3
ESP32-S3-WROOM-1U-N4R2
ESP32-S3-WROOM-1-N8R8
ESP32-S3FN8
ESP32-S3R2
ESP32-C3-MINI-1-N4
ESP32-S2FH4
ESP32-PICO-MINI-02U-N8R2
ESP32-PICO-D4
ESP32-WROVER-B-N16R8
ESP32-WROVER-IE-N16R8
ESP32-WROOM-32E-N8R2
ESP32-WROOM-32E-H4
ESP32-WROOM-32E-N8
ESP32-WROVER-IE-N8R8
ESP32-WROOM-32E-N16
ESP32-MINI-1-H4
ESP-WROOM-02-N4
ESP-WROOM-02D-N2
ESP32-PICO-V3-02
ESP32-WROOM-32U-N8
ESP32-WROOM-32UE-N16
ESP32-WROVER-E-N8R8
ESP32-WROOM-32E-N4
ESP-WROOM-02U-N2
ESP32-S2-WROOM-I-N4
ESP32-S3-WROOM-1U-N16R2
ESP32-S3-WROOM-1-N8R2
ESP32-PICO-MINI-02-N8R2
ESP32-WROVER-B-N8R8
ESP32-WROOM-32UE-H4
ESP8684H4
ESP8684-MINI-1-H4(S)
ESP32-S3-WROOM-1U-N4R8
ESP8285N08
ESP32-S3-WROOM-1-N4R8
ESP32-S3-WROOM-1U-N8R2
ESP-WROOM-02U-N4
ESP32-S2-MINI-1-N4
ESP32-S2-MINI-1U-N4
ESP32-S2
ESP32-S2R2
ESP32-S2FH2
ESP32-S2-MINI-2-N4
ESP32-S2-MINI-2U-N4
ESP32-S2-MINI-2-N4R2
ESP32-S2-MINI-2U-N4R2
ESP32-S2-WROOM-N4
ESP32-S2-WROVER-N4R2
ESP32-S2-WROVER-N8R2
ESP32-S2-WROVER-N16R2
ESP32-S2-WROVER-I-N4R2
ESP32-S2-WROVER-I-N8R2
ESP32-S2-WROVER-I-N16R2
ESP32-S2-MINI-1U-N4R2
ESP32-S2-SOLO-N4
ESP32-S2-SOLO-U-N4
ESP32-C3
