ESP32 电池切换控制
Worked for 20 mins 26 sec
针脚映射和元件布局已完成，模块排母按15.24mm中心距放置并保留USB/天线空间。当前唯一阻塞是4层叠层没有成功保存，我会再做一次针对性修复并读回确认，然后停在布局确认点。
Worked for 5 mins 50 sec
4层叠层已成功修复为Top信号、内层地、内层电源、Bottom信号；模块与逻辑区的局部拥塞也已拉开。正在做布局确认点的最终读回。
Thought for 17 sec
布局阶段已经完成并通过基础检查；我将停在走线前确认点，等待你确认模块排距与整体布局后再布线。
Thought for 16 sec
已按图片完成针脚映射和PCB布局：
- PCB：180×140mm、4层。
- ESP32排母：2×1×9、2.54mm针距、15.24mm排距。
- USB朝左侧板边，天线朝右并保留无铜区域。
- GPIO、I²C、移位寄存器和采样选择信号已固定。
- 继电器、32A端子、模拟采样及控制区已分区布局。
- 尚未走线。
**待确认：**15.24mm排距依据兼容模块常见封装推定，首板前请用卡尺测量你手中模块两排针的中心距离。确认排距及当前布局后，我再开始15A功率铜皮和控制信号走线。
确认布局并走线
先检查DRC
优化板子尺寸
生成装配预览
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Power Budget
Rail loads
Table
| Rail | Load | Design current |
|---|---|---|
| External 5V | ESP32-S3 Super Mini / WiFi transient | 500mA provisional（精确模块最大值待实物验证） |
| External 5V | HOB 50-P | 26mA max（LEM datasheet） |
| External 5V → 3.3V LDO | ADS1115 + CD74HC4051 + CD74HC595 | <30mA design allowance |
| External 12V coil rail | One CB1aHF-P-12V coil | 117mA nominal, 1.4W（103Ω coil） |
| External 12V coil rail | Fault case, all six commanded | 702mA nominal |
External 5V control supply
Provisional simultaneous input current is approximately
0.500 + 0.026 + 0.030 = 0.556A. Allowing ESP32 radio transients, module variation, protection drop and expansion margin, use a regulated 5V supply rated at least 1A. This rail is independent of all six battery positives and remains alive during relay break-before-make dead time.Input path:
J8 pin 1 → F1 → D7 → 5V; J8 pin 2 is common GND.- F1: Littelfuse 0805L110WR PPTC, 1.1A hold, selected for approximately 1A-class control input protection.
- D7: SS54 5A/40V Schottky in series for reverse-polarity protection and current/thermal margin.
- Check the actual protected-rail voltage under worst-case current; Schottky forward drop means a nominal 5V adapter does not produce exactly 5.0V downstream.
- C13/C16 provide bulk and local rail decoupling; C18 remains the TLV75533 input capacitor.
3.3V logic LDO
TLV75533PDBVR is rated 500mA. Expected logic load <30mA; dissipation at 30mA is
(5-3.3)×0.03=0.051W. The fitted 1uF input/output capacitors remain; effective capacitance must remain ≥0.47uF.External 12V relay-coil supply
J12: external regulated 12V DC input, recommended continuous rating at least 1A.J13: series maintained normally-closed KILL switch loop, switch/cabling rated ≥1A DC at 12V.- Open/absent J13 removes power from all coils and ULN clamp COM. Normal firmware one-hot operation draws one coil ≈117mA; ≥1A supply rating covers the six-coil fault case (~702mA) with margin.
Common return requirement
External 5V negative, external 12V negative and all battery negatives must join the board
GND. Do not connect 12V to the ESP32 module or 5V logic rail.Removed conversion loads
There is no onboard control-power buck and no battery OR-ing source. D1–D6,
CTRL_RAW, U6/L1 and buck-only input/bootstrap components are removed; therefore no buck efficiency or battery-derived control-current calculation applies.Main path
15A continuous/max. Relay contacts and HOB primary path exceed this target; Phoenix 1868076 terminals are nominally 32A. Each battery requires an external replaceable 20A fuse near its positive terminal. Final PCB copper/thermal validation remains a later stage.
Rail loads
External 5V control supply
3.3V logic LDO
External 12V relay-coil supply
Common return requirement
Removed conversion loads
Main path
