kicad：EasyEDA→KiCad 工程（Board1/Board2）、库、脚本与评审文档（IC 引脚、风扇、热、EDL 供电、布局规则）

Co-Authored-By: Claude Opus 5.5 <[email protected]>

kicad/firmware-sync/fan-manufacturer-questions.txt

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+Draft only; not sent.
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+Subject: Electrical interface and startup data for SANYO DENKI 9G0612P4S001
+
+We are evaluating two 9G0612P4S001 fans in a 12V system (10.8 to 13.2V
+system supply). Please provide specifications explicitly applicable to
+this complete part number, including temperature and voltage conditions:
+
+1. PWM input: recommended frequency range, VIH/VIL, absolute maximum
+   voltage, open-circuit voltage, maximum source current, input leakage
+   and behavior when the fan is unpowered. Can two inputs share one
+   open-drain driver? Is 0% duty guaranteed to keep running?
+2. Pulse sensor: output topology, pulses per revolution, maximum pull-up
+   voltage, sink current, guaranteed VOL, off-state leakage, rise/fall
+   times, and output behavior during power-up, power-down and rotor lock.
+3. Supply: maximum operating current (not nominal rated current), startup
+   peak current and duration, input capacitance/inrush, locked-rotor
+   current and automatic restart pulse/retry timing, and minimum off-time
+   before restart. Please include worst cases over the operating range.
+4. Are the published general PWM/pulse-sensor example limits guaranteed
+   for 9G0612P4S001? If so, please identify the governing document/revision.
+5. Please supply recommended branch protection, permissible supply ramp,
+   signal connection order, and any restrictions on live connection.
+
+Current interface for review:
+- Fan power switched by a common high-side MOSFET; fan grounds stay fixed.
+- PWM: shared open-drain NMOS, nominal 25kHz.
+- Each yellow sensor wire: 10k pull-up to switched fan power; 15k series
+  to an NMOS gate, 10k gate-to-ground. The NMOS drain has a separate
+  10k pull-up to 3.3V and drives its own MCU input.
+- Red=power, black=ground, yellow=pulse sensor, brown=PWM.
+
+Please identify any interface restrictions that make this circuit
+incompatible. We have not treated the family example limits or the
+0.67A rated current as guaranteed model-specific worst-case values.