{
 "page": "P3B-EXPAND",
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 "texts": [
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   45,
   806,
   "[A] 74HC595 x2 —— 15 路侧键驱动（U21 在前，Q7S 级联到 U22 的 DS）",
   0,
   12
  ],
  [
   45,
   795,
   "先移入的位落到 U22.Q7；OE# 上拉 100k，ESP32 复位期间输出高阻",
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   12
  ],
  [
   445,
   790,
   "[B] PCA9555 输入扩展 —— 地址 0x20（A0/A1/A2 全接地）",
   0,
   12
  ],
  [
   445,
   779,
   "IO0_7 与 IO1_5~7 备用脚直接接地：上电默认即输入，",
   0,
   12
  ],
  [
   445,
   768,
   "固件严禁把 Port0[7] / Port1[7:5] 配成输出。",
   0,
   12
  ],
  [
   45,
   200,
   "[C] DAC63204 x2 —— 5 路调压（U6 = 0x4A / A0->SDA，U7 = 0x4B / A0->SCL）",
   0,
   12
  ],
  [
   45,
   189,
   "三处 datasheet 强制要求，图上看不出来但接错就出问题：",
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  ],
  [
   45,
   178,
   "  1) FBx 必须接回 OUTx —— 电压输出模式下这是运放的闭环反馈",
   0,
   12
  ],
  [
   45,
   167,
   "  2) CAP 接 2.2uF 到 AGND（内部 LDO 旁路，允许 0.5~15uF）",
   0,
   12
  ],
  [
   45,
   156,
   "  3) VREF 不用外部基准时要 100nF 到地 + 10k 上拉到 VDD",
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   12
  ],
  [
   45,
   145,
   "内部基准 1.212V，增益 2x -> 满量程 2.424V（不是 2.5V）",
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  ],
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   45,
   806,
   "[A] 74HC595 x2 —— 15 路侧键驱动（U21 在前，Q7S 级联到 U22 的 DS）",
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   12
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   445,
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   "[B] PCA9555 输入扩展 —— 地址 0x20（A0/A1/A2 全接地）",
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   445,
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  ],
  [
   445,
   768,
   "固件严禁把 Port0[7] / Port1[7:5] 配成输出。",
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   12
  ],
  [
   45,
   200,
   "[C] DAC63204 x2 —— 5 路调压（U6 = 0x4A / A0->SDA，U7 = 0x4B / A0->SCL）",
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  ],
  [
   45,
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   45,
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   12
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   45,
   167,
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   12
  ],
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   45,
   156,
   "  3) VREF 不用外部基准时要 100nF 到地 + 10k 上拉到 VDD",
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   45,
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   "[A] 74HC595 x2 —— 15 路侧键驱动（U21 在前，Q7S 级联到 U22 的 DS）",
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   0,
   12
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  [
   445,
   790,
   "[B] PCA9555 输入扩展 —— 地址 0x20（A0/A1/A2 全接地）",
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   12
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  [
   445,
   779,
   "IO0_7 与 IO1_5~7 备用脚直接接地：上电默认即输入，",
   0,
   12
  ],
  [
   445,
   768,
   "固件严禁把 Port0[7] / Port1[7:5] 配成输出。",
   0,
   12
  ],
  [
   45,
   205,
   "[C] DAC63204 x2 —— 5 路调压（U6=0x4A / A0->SDA，U7=0x4B / A0->SCL）",
   0,
   12
  ],
  [
   45,
   190,
   "三处 datasheet 强制要求，图上看不出来但接错就出问题：",
   0,
   12
  ],
  [
   45,
   175,
   "  1) FBx 必须接回 OUTx —— 电压输出模式下这是运放的闭环反馈",
   0,
   12
  ],
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   45,
   160,
   "  2) CAP 接 2.2uF 到 AGND（内部 LDO 旁路，允许 0.5~15uF）",
   0,
   12
  ],
  [
   45,
   145,
   "  3) VREF 不用外部基准时要 100nF 到地 + 10k 上拉到 VDD",
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   12
  ],
  [
   45,
   130,
   "内部基准 1.212V，增益 2x -> 满量程 2.424V（不是 2.5V）",
   0,
   12
  ],
  [
   45,
   806,
   "[A] 74HC595 x2 —— 15 路侧键驱动",
   0,
   12
  ],
  [
   600,
   806,
   "[B] PCA9555 输入扩展（地址 0x20）",
   0,
   12
  ],
  [
   45,
   205,
   "[C] DAC63204 x2 —— 5 路调压",
   0,
   12
  ],
  [
   45,
   190,
   "595: U21 在前，Q7S 级联到 U22.DS；先移入的位落到 U22.Q7。",
   0,
   12
  ],
  [
   45,
   178,
   "OE# 上拉 100k —— ESP32 复位期间 15 路输出全部高阻。",
   0,
   12
  ],
  [
   45,
   166,
   "PCA9555 备用脚 IO0_7 / IO1_5~7 直接接地（上电默认即输入），",
   0,
   12
  ],
  [
   45,
   154,
   "固件严禁把 Port0[7] / Port1[7:5] 配成输出。",
   0,
   12
  ],
  [
   45,
   142,
   "DAC 地址：U6 = 0x4A（A0->SDA），U7 = 0x4B（A0->SCL）。",
   0,
   12
  ],
  [
   45,
   130,
   "FBx 必须接回 OUTx；CAP 接 2.2uF 到 AGND；VREF 空置时",
   0,
   12
  ],
  [
   45,
   118,
   "100nF 到地 + 10k 上拉 VDD。内部基准 1.212V x2 = 2.424V。",
   0,
   12
  ],
  [
   95,
   790,
   "[A] 74HC595 x2 —— 15 路侧键驱动",
   0,
   12
  ],
  [
   600,
   785,
   "[B] PCA9555 输入扩展（地址 0x20）",
   0,
   12
  ],
  [
   150,
   205,
   "[C] DAC63204 x2 —— 5 路调压",
   0,
   12
  ],
  [
   45,
   190,
   "595: U21 在前，Q7S 级联到 U22.DS；先移入的位落到 U22.Q7。",
   0,
   12
  ],
  [
   45,
   178,
   "OE# 上拉 100k —— ESP32 复位期间 15 路输出全部高阻。",
   0,
   12
  ],
  [
   45,
   166,
   "PCA9555 备用脚 IO0_7 / IO1_5~7 直接接地（上电默认即输入），",
   0,
   12
  ],
  [
   45,
   154,
   "固件严禁把 Port0[7] / Port1[7:5] 配成输出。",
   0,
   12
  ],
  [
   45,
   142,
   "DAC 地址：U6 = 0x4A（A0->SDA），U7 = 0x4B（A0->SCL）。",
   0,
   12
  ],
  [
   45,
   130,
   "FBx 必须接回 OUTx；CAP 接 2.2uF 到 AGND；VREF 空置时",
   0,
   12
  ],
  [
   45,
   118,
   "100nF 到地 + 10k 上拉 VDD。内部基准 1.212V x2 = 2.424V。",
   0,
   12
  ],
  [
   45,
   806,
   "[A] 74HC595 x2 —— 15 路侧键驱动",
   0,
   12
  ],
  [
   600,
   806,
   "[B] PCA9555 输入扩展（地址 0x20）",
   0,
   12
  ],
  [
   150,
   205,
   "[C] DAC63204 x2 —— 5 路调压",
   0,
   12
  ],
  [
   45,
   190,
   "595: U21 在前，Q7S 级联到 U22.DS；先移入的位落到 U22.Q7。",
   0,
   12
  ],
  [
   45,
   175,
   "U22.Q7 = HUB_RST，远程复位板载 USB Hub（§21.7）；OE# 高阻时靠 R716 上拉保持不复位。",
   0,
   12
  ],
  [
   45,
   178,
   "OE# 上拉 100k —— ESP32 复位期间 15 路输出全部高阻。",
   0,
   12
  ],
  [
   45,
   166,
   "PCA9555 备用脚 IO0_7 / IO1_5~7 直接接地（上电默认即输入），",
   0,
   12
  ],
  [
   45,
   154,
   "固件严禁把 Port0[7] / Port1[7:5] 配成输出。",
   0,
   12
  ],
  [
   45,
   142,
   "DAC 地址：U6 = 0x4A（A0->SDA），U7 = 0x4B（A0->SCL）。",
   0,
   12
  ],
  [
   45,
   130,
   "FBx 必须接回 OUTx；CAP 接 2.2uF 到 AGND；VREF 空置时",
   0,
   12
  ],
  [
   45,
   118,
   "100nF 到地 + 10k 上拉 VDD。内部基准 1.212V x2 = 2.424V。",
   0,
   12
  ],
  [
   45,
   806,
   "【A】74HC595 ×3 的前两片（U21 / U22）—— 侧键驱动 + HUB_RST",
   0,
   12
  ],
  [
   45,
   795,
   "链序 U21 → U22 → U33（在 P6-FAN-EDL），SR_CAS / SR_CAS2 级联，整条链 24 位；",
   0,
   12
  ],
  [
   45,
   784,
   "SRCLK / RCLK / OE# 三片共用，OE# 上拉 100k ⇒ ESP32 复位期间 24 路输出全部高阻。",
   0,
   12
  ],
  [
   445,
   790,
   "【B】PCA9555 输入扩展 —— 地址 0x20（A0/A1/A2 全接地）",
   0,
   12
  ],
  [
   445,
   779,
   "IO0_7 与 IO1_5~7 备用脚直接接地：上电默认即输入，",
   0,
   12
  ],
  [
   445,
   768,
   "固件严禁把 Port0[7] / Port1[7:5] 配成输出。",
   0,
   12
  ],
  [
   45,
   205,
   "【C】DAC63204 ×2 —— 5 路调压（U6 = 0x4A / A0→SDA，U7 = 0x4B / A0→SCL）",
   0,
   12
  ],
  [
   45,
   190,
   "三处 datasheet 强制要求，图上看不出来但接错就出问题：",
   0,
   12
  ],
  [
   45,
   178,
   "  1) FBx 必须接回 OUTx —— 电压输出模式下这是运放的闭环反馈",
   0,
   12
  ],
  [
   45,
   167,
   "  2) CAP 接 2.2uF 到 AGND（内部 LDO 旁路，允许 0.5~15uF）",
   0,
   12
  ],
  [
   45,
   156,
   "  3) VREF 不用外部基准时要 100nF 到地 + 10k 上拉到 VDD",
   0,
   12
  ],
  [
   45,
   145,
   "内部基准 1.212V，增益 2x -> 满量程 2.424V（不是 2.5V）",
   0,
   12
  ],
  [
   45,
   130,
   "通道 2026-09-06 按 PCB 几何重排（§26.18）：U6 = VDAC2 / VDAC4 / VDAC1（都去西半板），",
   0,
   12
  ],
  [
   45,
   119,
   "U7 = VDAC3 / VDAC5（都去东半板）。四个通道完全对等，改的只是固件里的通道号。",
   0,
   12
  ],
  [
   45,
   806,
   "【A】74HC595 ×3 的前两片（U21 / U22）",
   0,
   12
  ],
  [
   45,
   795,
   "链序 U21 → U22 → U33（在 P6），整条链 24 位；",
   0,
   12
  ],
  [
   45,
   784,
   "SRCLK/RCLK/OE# 三片共用，OE# 上拉 100k ⇒ 复位全高阻",
   0,
   12
  ],
  [
   445,
   790,
   "【B】PCA9555 输入扩展 —— 地址 0x20（A0/A1/A2 全接地）",
   0,
   12
  ],
  [
   445,
   779,
   "IO0_7 与 IO1_5~7 备用脚直接接地：上电默认即输入，",
   0,
   12
  ],
  [
   445,
   768,
   "固件严禁把 Port0[7] / Port1[7:5] 配成输出。",
   0,
   12
  ],
  [
   45,
   205,
   "【C】DAC63204 ×2 —— 5 路调压",
   0,
   12
  ],
  [
   45,
   194,
   "U6 = 0x4A（A0→SDA），U7 = 0x4B（A0→SCL）",
   0,
   12
  ],
  [
   45,
   180,
   "三处 datasheet 强制要求，接错也不报错：",
   0,
   12
  ],
  [
   45,
   169,
   "  1) FBx 必须接回 OUTx（电压模式的闭环反馈）",
   0,
   12
  ],
  [
   45,
   158,
   "  2) CAP 接 2.2uF 到 AGND（LDO 旁路 0.5~15uF）",
   0,
   12
  ],
  [
   45,
   147,
   "  3) VREF 空置时 100nF 到地 + 10k 上拉 VDD",
   0,
   12
  ],
  [
   45,
   136,
   "内部基准 1.212V，×2 -> 满量程 2.424V（不是 2.5V）",
   0,
   12
  ],
  [
   45,
   122,
   "通道按几何重排（§26.18）：U6 = VDAC2/4/1（去西半板），",
   0,
   12
  ],
  [
   45,
   111,
   "U7 = VDAC3/5（去东半板）。四通道对等，只改固件通道号。",
   0,
   12
  ],
  [
   45,
   806,
   "【A】（已搬走）74HC595 ×3 与 15 颗按键 MOS 2026-09-06 整窝挪到载板",
   0,
   12
  ],
  [
   45,
   795,
   "（载板 C6-KEYS / C4-SITEn，§26.23）。KEY_SER/SRCLK/RCLK/OE#",
   0,
   12
  ],
  [
   45,
   784,
   "四根线从 P3 的 ESP32 直接去 P5-BTB 的 J25 北排 3~6 行。",
   0,
   12
  ],
  [
   445,
   790,
   "【B】PCA9555 输入扩展 —— 地址 0x20（A0/A1/A2 全接地）",
   0,
   12
  ],
  [
   445,
   779,
   "IO0_7 与 IO1_5~7 备用脚直接接地：上电默认即输入，",
   0,
   12
  ],
  [
   445,
   768,
   "固件严禁把 Port0[7] / Port1[7:5] 配成输出。",
   0,
   12
  ],
  [
   45,
   205,
   "【C】DAC63204 ×2 —— 5 路调压",
   0,
   12
  ],
  [
   45,
   194,
   "U6 = 0x4A（A0→SDA），U7 = 0x4B（A0→SCL）",
   0,
   12
  ],
  [
   45,
   180,
   "三处 datasheet 强制要求，接错也不报错：",
   0,
   12
  ],
  [
   45,
   169,
   "  1) FBx 必须接回 OUTx（电压模式的闭环反馈）",
   0,
   12
  ],
  [
   45,
   158,
   "  2) CAP 接 2.2uF 到 AGND（LDO 旁路 0.5~15uF）",
   0,
   12
  ],
  [
   45,
   147,
   "  3) VREF 空置时 100nF 到地 + 10k 上拉 VDD",
   0,
   12
  ],
  [
   45,
   136,
   "内部基准 1.212V，×2 -> 满量程 2.424V（不是 2.5V）",
   0,
   12
  ],
  [
   45,
   122,
   "通道按几何重排（§26.18）：U6 = VDAC2/4/1（去西半板），",
   0,
   12
  ],
  [
   45,
   111,
   "U7 = VDAC3/5（去东半板）。四通道对等，只改固件通道号。",
   0,
   12
  ]
 ],
 "nRect": 0,
 "nPoly": 0
}