1_buck_chain.cir:
- RL1 creaba nodo flotante V5V_AFTER_L sin retorno
- Reemplazado por parametro Rser=0.051 en L1 (soporte nativo LTspice)
2_output_stage.cir:
- Gcoll con VALUE={} no es sintaxis valida para G-source en LTspice
→ convertido a B-source: Bcoll GATE_Q1 EMITTER I={MAX(0, 1.0*I(Dled))}
- .net V(out1) VLOAD → directiva invalida en este contexto, eliminada
- .meas V(out1) → nodo inexistente, corregido a V(drain_q1)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
All analog ports (IN-BAT, IN-WATER, IN-OILP, IN-RPM) now use R_high=100K,
R_low=27K — unified design confirmed in schematic. Updated .param values,
voltage divider netlist, verification comments, and design notes.
Vout @ 14.4V (alternator) = 3.06V — just at the ADC limit, correct.
Vout @ 15.5V = 3.30V — absolute maximum safe input voltage.
Filter fc = 747 Hz with 100K||27K and 10nF.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Simulates the full RS-485 half-duplex channel on the ESP32+CAN+RS485 board:
- SN65HVD1781 behavioral driver/receiver (3.3V native, 32 unit loads)
- Half-duplex direction control via DE/RE GPIO4
- 560Ω bias resistors keeping bus HIGH during idle (NMEA 0183 failsafe)
- 120Ω termination at both ends of a 10m T-line model (Zo=120, Td=50ns)
- Transmits ASCII 'G' (0x47) at 4800 bps — one complete NMEA character
- Second node as passive 12kΩ unit-load receiver
- .meas directives verify Vdiff > ±200mV (RS-485 spec) in both polarities
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Four .cir behavioral simulations ready to open in LTspice via File→Open:
1_buck_chain.cir — dual MP2338 12V→5V→3.3V, verifies Rfb math + soft-start
2_output_stage.cir — PC817 + IRLML6344 isolated output (inverted logic confirmed)
3_analog_input.cir — analog input conditioning; flags ADC overvoltage on IN-BAT/WATER/OILP
4_nmea2000_can.cir — MCP2562T CAN transceiver, two-node NMEA2000 bus, T-line model
CRITICAL finding in 3_analog_input.cir: R_high=10K + R_low=15K gives 4.3V
at ESP32 ADC when measuring a 12V battery — exceeds 3.3V limit. Fix: use
R_high=100K (same as IN-RPM, which is correctly designed at 3.06V @ 14.4V).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
alro65