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    45,
    806,
    "【A】第三片 74HC595（U33）—— 5 路 EDL_EN"
   ],
   [
    45,
    786,
    "级联在 U22 之后：U22.QH'(9) -> U33.SER(14)，网络名 SR_CAS2。整条链变成 24 位，"
   ],
   [
    45,
    770,
    "先移入的字节落到 U33。SRCLK / RCLK / OE# 与前两片共用。"
   ],
   [
    45,
    754,
    "QA~QE = EDL_EN1~5；QF/QG/QH 备用不接。"
   ],
   [
    45,
    738,
    "100k 下拉不放在这里 —— 跟按键 MOS 栅极一样，放在载板上紧挨模拟开关（§8.1 复位安全）。"
   ],
   [
    540,
    806,
    "【B】风扇：低边 N-MOS + PWM，5 个风扇并一路（§22.6）"
   ],
   [
    540,
    786,
    "Q6 AO3400A 切风扇回流，D2 SS34 做续流 —— 风扇是感性负载，少了它 MOS 会被反峰打穿。"
   ],
   [
    540,
    770,
    "FAN_PWM = IO47，FAN_TACH = IO48。5 个 TACH 并联做线或，停一个频率掉约 1/5。"
   ],
   [
    540,
    754,
    "TACH 必须分压：低边 PWM 关断时风扇地被抬到 12V，TACH 集电极开路也跟着到 12V。"
   ],
   [
    540,
    738,
    "10k 上拉到 12V + 10k/3.3k 分压 -> IO48 最高 2.98V。关断期间读到稳定高电平（测不到转速），"
   ],
   [
    540,
    722,
    "导通期间才有脉冲 —— 这是低边调速的固有限制，不是接线错。"
   ],
   [
    45,
    175,
    "风扇电流 4x0.10 + 1x0.30 = 0.70A @12V；12V 输入预算 7.6 -> 8.3A，10A 适配器仍有余量。"
   ],
   [
    45,
    155,
    "风扇座 KF2510-3A：pin1 = +12V，pin2 = 风扇回流（MOS 漏极），pin3 = TACH。"
   ],
   [
    45,
    806,
    "【A】第三片 74HC595（U33）—— 5 路 EDL_EN"
   ],
   [
    45,
    786,
    "级联在 U22 之后：U22.QH'(9) -> U33.SER(14)，网络名 SR_CAS2。整条链变成 24 位，"
   ],
   [
    45,
    770,
    "先移入的字节落到 U33。SRCLK / RCLK / OE# 与前两片共用。"
   ],
   [
    45,
    754,
    "QA~QE = EDL_EN1~5；QF/QG/QH 备用不接。"
   ],
   [
    45,
    738,
    "100k 下拉不放在这里 —— 跟按键 MOS 栅极一样，放在载板上紧挨模拟开关（§8.1 复位安全）。"
   ],
   [
    540,
    806,
    "【B】风扇：低边 N-MOS + PWM，5 个风扇并一路（§22.6）"
   ],
   [
    540,
    786,
    "Q6 AO3400A 切风扇回流，D2 SS34 做续流 —— 风扇是感性负载，少了它 MOS 会被反峰打穿。"
   ],
   [
    540,
    770,
    "FAN_PWM = IO47，FAN_TACH = IO48。5 个 TACH 并联做线或，停一个频率掉约 1/5。"
   ],
   [
    540,
    754,
    "TACH 必须分压：低边 PWM 关断时风扇地被抬到 12V，TACH 集电极开路也跟着到 12V。"
   ],
   [
    540,
    738,
    "10k 上拉到 12V + 10k/3.3k 分压 -> IO48 最高 2.98V。关断期间读到稳定高电平（测不到转速），"
   ],
   [
    540,
    722,
    "导通期间才有脉冲 —— 这是低边调速的固有限制，不是接线错。"
   ],
   [
    45,
    175,
    "风扇电流 4x0.10 + 1x0.30 = 0.70A @12V；12V 输入预算 7.6 -> 8.3A，10A 适配器仍有余量。"
   ],
   [
    45,
    155,
    "风扇座 KF2510-3A：pin1 = +12V，pin2 = 风扇回流（MOS 漏极），pin3 = TACH。"
   ],
   [
    45,
    806,
    "【A】第三片 74HC595（U33）—— 5 路 EDL_EN"
   ],
   [
    45,
    786,
    "级联在 U22 之后：U22.QH'(9) -> U33.SER(14)，网络名 SR_CAS2。整条链变成 24 位，"
   ],
   [
    45,
    770,
    "先移入的字节落到 U33。SRCLK / RCLK / OE# 与前两片共用。"
   ],
   [
    45,
    754,
    "QA~QE = EDL_EN1~5；QF/QG/QH 备用不接。"
   ],
   [
    45,
    738,
    "100k 下拉不放在这里 —— 跟按键 MOS 栅极一样，放在载板上紧挨模拟开关（§8.1 复位安全）。"
   ],
   [
    45,
    520,
    "【B】风扇：低边 N-MOS + PWM，5 个风扇并一路（§22.6）"
   ],
   [
    45,
    500,
    "Q6 AO3400A 切风扇回流，D2 SS34 做续流 —— 风扇是感性负载，"
   ],
   [
    45,
    484,
    "少了它 MOS 会被反峰打穿。FAN_PWM = IO47，FAN_TACH = IO48。"
   ],
   [
    45,
    468,
    "5 个 TACH 并联做线或，停一个频率掉约 1/5（分不出是哪一个）。"
   ],
   [
    45,
    444,
    "TACH 必须分压：低边 PWM 关断时风扇地被抬到 12V，"
   ],
   [
    45,
    428,
    "TACH 是集电极开路，也跟着到 12V —— 直连 IO48 会打穿 ESP32。"
   ],
   [
    45,
    412,
    "10k 上拉到 12V + 10k/3.3k 分压 -> IO48 最高 2.98V。"
   ],
   [
    45,
    396,
    "关断期间读到稳定高电平（测不到转速），导通期间才有脉冲 ——"
   ],
   [
    45,
    380,
    "这是低边调速的固有限制，不是接线错。"
   ],
   [
    45,
    175,
    "风扇电流 4x0.10 + 1x0.30 = 0.70A @12V；12V 输入预算 7.6 -> 8.3A，10A 适配器仍有余量。"
   ],
   [
    45,
    155,
    "风扇座 KF2510-3A：pin1 = +12V，pin2 = 风扇回流（MOS 漏极），pin3 = TACH。"
   ],
   [
    460,
    806,
    "【A】第三片 74HC595（U33）—— 5 路 EDL_EN"
   ],
   [
    460,
    786,
    "级联在 U22 之后：U22.QH'(9) -> U33.SER(14)，网络名 SR_CAS2。"
   ],
   [
    460,
    770,
    "整条链变成 24 位，先移入的字节落到 U33。SRCLK / RCLK / OE# 与前两片共用。"
   ],
   [
    460,
    754,
    "QA~QE = EDL_EN1~5；QF/QG/QH 备用不接。"
   ],
   [
    45,
    340,
    "【B】风扇：低边 N-MOS + PWM，5 个风扇并一路（§22.6）"
   ],
   [
    45,
    318,
    "Q6 AO3400A 切风扇回流，D2 SS34 做续流 —— 风扇是感性负载，"
   ],
   [
    45,
    302,
    "少了它 MOS 会被反峰打穿。FAN_PWM = IO47，FAN_TACH = IO48。"
   ],
   [
    45,
    286,
    "5 个 TACH 并联做线或，停一个频率掉约 1/5（分不出是哪一个）。"
   ],
   [
    45,
    262,
    "TACH 必须分压：低边 PWM 关断时风扇地被抬到 12V，TACH 是集电极"
   ],
   [
    45,
    246,
    "开路，也跟着到 12V —— 直连 IO48 会打穿 ESP32。"
   ],
   [
    45,
    230,
    "10k 上拉到 12V + 10k/3.3k 分压 -> IO48 最高 2.98V。关断期间读到"
   ],
   [
    45,
    214,
    "稳定高电平（测不到转速），导通期间才有脉冲 —— 这是低边调速的"
   ],
   [
    45,
    198,
    "固有限制，不是接线错。"
   ],
   [
    45,
    174,
    "EDL_EN 的 100k 下拉不放这一页 —— 跟按键 MOS 栅极一样，放在载板"
   ],
   [
    45,
    158,
    "上紧挨模拟开关（§8.1 复位安全）。"
   ],
   [
    45,
    134,
    "风扇电流 4x0.10 + 1x0.30 = 0.70A @12V；12V 预算 7.6 -> 8.3A，10A 适配器仍有余量。"
   ],
   [
    45,
    118,
    "风扇座 KF2510-3A：pin1 = +12V，pin2 = 风扇回流（MOS 漏极），pin3 = TACH。"
   ],
   [
    460,
    806,
    "【A】第三片 74HC595（U33）—— 5 路 EDL_EN"
   ],
   [
    460,
    786,
    "级联在 U22 之后：U22.QH'(9) -> U33.SER(14)，网络名 SR_CAS2。"
   ],
   [
    460,
    770,
    "整条链变成 24 位，先移入的字节落到 U33。SRCLK / RCLK / OE# 与前两片共用。"
   ],
   [
    460,
    754,
    "QA~QE = EDL_EN1~5；QF/QG/QH 备用不接。"
   ],
   [
    45,
    340,
    "【B】风扇：低边 N-MOS + PWM，5 个风扇并一路（§22.6）"
   ],
   [
    45,
    318,
    "Q6 AO3400A 切风扇回流，D2 SS34 做续流 —— 风扇是感性负载，"
   ],
   [
    45,
    302,
    "少了它 MOS 会被反峰打穿。FAN_PWM = IO47，FAN_TACH = IO48。"
   ],
   [
    45,
    286,
    "5 个 TACH 并联做线或，停一个频率掉约 1/5（分不出是哪一个）。"
   ],
   [
    45,
    262,
    "TACH 必须分压：低边 PWM 关断时风扇地被抬到 12V，TACH 是集电极"
   ],
   [
    45,
    246,
    "开路，也跟着到 12V —— 直连 IO48 会打穿 ESP32。"
   ],
   [
    45,
    230,
    "10k 上拉到 12V + 10k/3.3k 分压 -> IO48 最高 2.98V。关断期间读到"
   ],
   [
    45,
    214,
    "稳定高电平（测不到转速），导通期间才有脉冲 —— 这是低边调速的"
   ],
   [
    45,
    198,
    "固有限制，不是接线错。"
   ],
   [
    45,
    174,
    "EDL_EN 的 100k 下拉不放这一页 —— 跟按键 MOS 栅极一样，放在载板"
   ],
   [
    45,
    158,
    "上紧挨模拟开关（§8.1 复位安全）。"
   ],
   [
    45,
    134,
    "风扇电流 4x0.10 + 1x0.30 = 0.70A @12V；12V 预算 7.6 -> 8.3A，10A 适配器仍有余量。"
   ],
   [
    45,
    118,
    "风扇座 KF2510-3A：pin1 = +12V，pin2 = 风扇回流（MOS 漏极），pin3 = TACH。"
   ],
   [
    45,
    806,
    "【A】第三片 74HC595（U33）—— CH2 / CH3 的六个侧键 + EDL_EN1 + HUB_RST"
   ],
   [
    45,
    790,
    "级联在 U22 之后：U22.QH'(9) -> U33.SER(14)，网络名 SR_CAS2，整条链 24 位。"
   ],
   [
    45,
    774,
    "2026-09-06 按 PCB 几何重排（§26.18）：U33 在 y≈70 mm，正对北排的 CH2 / CH3，"
   ],
   [
    45,
    758,
    "比原来从 U21(y≈50) 拉过去近 20~30 mm。Q0=EDL_EN1，Q1~Q3=K2，Q4~Q6=K3，Q7=HUB_RST。"
   ],
   [
    45,
    742,
    "EDL_EN 与按键的 100k 下拉不放这一页 —— 放在载板上紧挨模拟开关（§8.1 复位安全）。"
   ],
   [
    45,
    520,
    "【B】风扇：低边 N-MOS + PWM，5 个风扇并一路（§22.6）"
   ],
   [
    45,
    500,
    "Q6 AO3400A 切风扇回流，D2 SS34 做续流 —— 风扇是感性负载，"
   ],
   [
    45,
    484,
    "少了它 MOS 会被反峰打穿。FAN_PWM = IO18（模块脚 11），FAN_TACH = IO16（模块脚 9）。"
   ],
   [
    45,
    468,
    "5 个 TACH 并联做线或，停一个频率掉约 1/5（分不出是哪一个）。"
   ],
   [
    45,
    444,
    "TACH 必须分压：低边 PWM 关断时风扇地被抬到 12V，"
   ],
   [
    45,
    428,
    "TACH 是集电极开路，也跟着到 12V —— 直连 GPIO 会打穿 ESP32。"
   ],
   [
    45,
    412,
    "10k 上拉到 12V + 10k/3.3k 分压 -> 最高 2.98V。"
   ],
   [
    45,
    396,
    "关断期间读到稳定高电平（测不到转速），导通期间才有脉冲 ——"
   ],
   [
    45,
    380,
    "这是低边调速的固有限制，不是接线错。"
   ],
   [
    45,
    175,
    "风扇电流 4x0.10 + 1x0.30 = 0.70A @12V；12V 输入预算 7.6 -> 8.3A，10A 适配器仍有余量。"
   ],
   [
    45,
    159,
    "风扇座 2510-3A 直针（C2803349）：pin1 = +12V，pin2 = 风扇回流（MOS 漏极），pin3 = TACH。"
   ],
   [
    45,
    806,
    "【A】第三片 74HC595（U33）—— CH2 / CH3 的六个侧键 + EDL_EN1 + HUB_RST"
   ],
   [
    45,
    790,
    "级联在 U22 之后：U22.QH'(9) -> U33.SER(14)，网络名 SR_CAS2，整条链 24 位。"
   ],
   [
    45,
    774,
    "2026-09-06 按 PCB 几何重排（§26.18）：U33 在 y≈70 mm，正对北排的 CH2 / CH3，"
   ],
   [
    45,
    758,
    "比原来从 U21(y≈50) 拉过去近 20~30 mm。Q0=EDL_EN1，Q1~Q3=K2，Q4~Q6=K3，Q7=HUB_RST。"
   ],
   [
    45,
    742,
    "EDL_EN 与按键的 100k 下拉不放这一页 —— 放在载板上紧挨模拟开关（§8.1 复位安全）。"
   ],
   [
    45,
    520,
    "【B】风扇：低边 N-MOS + PWM，5 个风扇并一路（§22.6）"
   ],
   [
    45,
    500,
    "Q6 AO3400A 切风扇回流，D2 SS34 做续流 —— 风扇是感性负载，"
   ],
   [
    45,
    484,
    "少了它 MOS 会被反峰打穿。FAN_PWM = IO18（模块脚 11），FAN_TACH = IO16（模块脚 9）。"
   ],
   [
    45,
    468,
    "5 个 TACH 并联做线或，停一个频率掉约 1/5（分不出是哪一个）。"
   ],
   [
    45,
    444,
    "TACH 必须分压：低边 PWM 关断时风扇地被抬到 12V，"
   ],
   [
    45,
    428,
    "TACH 是集电极开路，也跟着到 12V —— 直连 GPIO 会打穿 ESP32。"
   ],
   [
    45,
    412,
    "10k 上拉到 12V + 10k/3.3k 分压 -> 最高 2.98V。"
   ],
   [
    45,
    396,
    "关断期间读到稳定高电平（测不到转速），导通期间才有脉冲 ——"
   ],
   [
    45,
    380,
    "这是低边调速的固有限制，不是接线错。"
   ],
   [
    45,
    190,
    "风扇电流 4x0.10 + 1x0.30 = 0.70A @12V；"
   ],
   [
    45,
    176,
    "12V 输入预算 7.6 -> 8.3A，10A 适配器仍有余量。"
   ],
   [
    45,
    162,
    "风扇座 2510-3A 直针（C2803349）："
   ],
   [
    45,
    148,
    "pin1 = +12V，pin2 = 风扇回流（MOS 漏极），pin3 = TACH。"
   ],
   [
    45,
    806,
    "【A】（已搬走）第三片 74HC595（U33）2026-09-06 随整条链挪到载板 C6-KEYS（§26.23）。"
   ],
   [
    45,
    790,
    "EDL_EN1~5 / HUB_RST 从此是载板内部网络，不再过排针。这一页只剩风扇。"
   ],
   [
    45,
    520,
    "【B】风扇：低边 N-MOS + PWM，5 个风扇并一路（§22.6）"
   ],
   [
    45,
    500,
    "Q6 AO3400A 切风扇回流，D2 SS34 做续流 —— 风扇是感性负载，"
   ],
   [
    45,
    484,
    "少了它 MOS 会被反峰打穿。FAN_PWM = IO18（模块脚 11），FAN_TACH = IO16（模块脚 9）。"
   ],
   [
    45,
    468,
    "5 个 TACH 并联做线或，停一个频率掉约 1/5（分不出是哪一个）。"
   ],
   [
    45,
    444,
    "TACH 必须分压：低边 PWM 关断时风扇地被抬到 12V，"
   ],
   [
    45,
    428,
    "TACH 是集电极开路，也跟着到 12V —— 直连 GPIO 会打穿 ESP32。"
   ],
   [
    45,
    412,
    "10k 上拉到 12V + 10k/3.3k 分压 -> 最高 2.98V。"
   ],
   [
    45,
    396,
    "关断期间读到稳定高电平（测不到转速），导通期间才有脉冲 ——"
   ],
   [
    45,
    380,
    "这是低边调速的固有限制，不是接线错。"
   ],
   [
    45,
    190,
    "风扇电流 4x0.10 + 1x0.30 = 0.70A @12V；"
   ],
   [
    45,
    176,
    "12V 输入预算 7.6 -> 8.3A，10A 适配器仍有余量。"
   ],
   [
    45,
    162,
    "风扇座 2510-3A 直针（C2803349）："
   ],
   [
    45,
    148,
    "pin1 = +12V，pin2 = 风扇回流（MOS 漏极），pin3 = TACH。"
   ]
  ]
 },
 "windowId": "7b032d25-27b0-4553-b6e3-e8a56cefbaef"
}