Comprehensive electrical verification — strapping pins, decoupling adequacy, power sequencing, SPICE simulation, and 30-question manual checklist
Covers the gap between DFM/DRC (manufacturing checks) and actual electrical functionality. Verifies that the board will boot, power up correctly, and operate reliably.
cd /Users/pierrejonnycau/Documents/WORKS/esp32-emu-turbo
# 1a. Strapping pin verification (12 tests)
python3 scripts/verify_strapping_pins.py
# 1b. Decoupling capacitor adequacy (25 tests)
python3 scripts/verify_decoupling_adequacy.py
# 1c. Power sequencing verification (26 tests)
python3 scripts/verify_power_sequence.py
# 1d. SPICE power supply simulation (requires ngspice)
python3 scripts/spice_power_check.py
| Script | Tests | What it catches |
|---|---|---|
verify_strapping_pins.py | 12 | Wrong boot state, GPIO45 VDD_SPI conflict, EN RC timing |
verify_decoupling_adequacy.py | 25 | Insufficient capacitance per IC datasheet, missing HF bypass |
verify_power_sequence.py | 26 | Power chain topology, upstream/downstream ordering, GND continuity |
spice_power_check.py | 5 | Ripple on +5V/+3V3 rails, transient response, decoupling effectiveness |
verify_component_connectivity.py | 2 | BOM components with zero electrical connections (phantom parts) |
verify_signal_chain_complete.py | 53 | Nets that only connect to one endpoint (broken signal chains) |
# 1e. Component connectivity + signal chain completeness
python3 scripts/verify_component_connectivity.py
python3 scripts/verify_signal_chain_complete.py
Walk through each question. For each, read the relevant source files, check the PCB cache or routing.py, and give a VERDICT: OK, CONCERN, or RISK.
| # | Question | What to check |
|---|---|---|
| A1 | Are all power rails isolated from each other (no shorts)? | Run python3 scripts/verify_power_paths.py, check net isolation |
| A2 | Is the power switch between battery and IP5306? | Check SW_PWR pads in PCB cache, verify BAT+ net routing |
| A3 | Are USB CC1/CC2 pull-downs correct (5.1k to GND)? | Check R1, R2 values (5.1k) and nets (USB_CC1/CC2 to GND) |
| A4 | Is reverse polarity protection adequate? | Check BAT54C diode D1, JST connector polarity |
| # | Question | What to check |
|---|---|---|
| B1 | Does IP5306 boost start cleanly from 3.7V battery? | Check C17 (VIN), L1 (inductor), C19/C27 (VOUT) values |
| B2 | Is AMS1117 dropout voltage met? (+5V - 3.3V = 1.7V > 1.3V dropout) | AMS1117 datasheet: dropout 1.3V max, margin = 0.4V |
| B3 | Does EN pin RC delay allow supply to stabilize? | R3=10k, C3=100nF, tau=1ms, 3*tau=3ms < 5ms sample window |
| B4 | Is IP5306 KEY pin properly configured? | R16=100k pull-down, check KEY net routing |
| B5 | Can charge-and-play work? (USB + battery simultaneously) | IP5306 supports charge-and-play natively |
| # | Question | What to check |
|---|---|---|
| C1 | Is GPIO0 HIGH at boot? (normal boot vs download mode) | BTN_SELECT pull-up R9=10k to +3V3, button not pressed = HIGH |
| C2 | Is GPIO45 LOW at boot? (VDD_SPI=3.3V for PSRAM) | R14 DNP + i=10 skip in routing.py, no external pull-up |
| C3 | Is GPIO46 LOW at boot? (ROM log output) | LCD_WR has internal pull-down, no external pull-up |
| C4 | Does GPIO3 state matter? | Any state OK (USB JTAG select), pull-up is acceptable |
| C5 | Is PSRAM accessible at boot? (Octal SPI, needs VDD_SPI=3.3V) | Depends on C2 (GPIO45=LOW), verified by strapping check |
| C6 | Is flash accessible? (16MB SPI flash on module) | Module has internal flash connection, no external routing needed |
| # | Question | What to check |
|---|---|---|
| D1 | Can ESP32 source enough current for all peripherals? | Total: ~350mA max (WiFi burst), AMS1117 rated 1A |
| D2 | Is display bus functional? (8-bit 8080 parallel) | Check LCD_D0-D7, CS, RST, DC, WR traces; LCD_RD tied HIGH; LCD_BL via resistor |
| D3 | Is SD card SPI functional? | Check SD_MOSI, SD_MISO, SD_CLK, SD_CS routing to TF-01A |
| D4 | Is I2S audio path clean? | Check I2S_BCLK, I2S_LRCK, I2S_DOUT to PAM8403; DC-blocking cap C22 |
| D5 | Are all buttons readable? | 12 buttons + menu combo via BAT54C D1 |
| D6 | Is USB data path functional? | D+/D- through USBLC6-2SC6 (U4), 22ohm series (R22/R23), to ESP32 |
| D7 | Is speaker output adequate? | PAM8403 3W per channel, SPK+/SPK- to 28mm speaker |
| D8 | Are LEDs functional? | LED1/LED2 through R17/R18 (1k), connected to IP5306 LED outputs |
| D9 | Is thermal dissipation adequate? | AMS1117: P=(5-3.3)*0.35=0.6W, SOT-223 can handle ~1.5W with thermal pad |
| # | Question | What to check |
|---|---|---|
| E1 | What happens if USB is plugged in while battery is low? | IP5306 handles charge-and-play, VBUS powers via VIN |
| E2 | What happens if battery is removed while USB powers the board? | IP5306 VOUT continues from VBUS, check C19 bulk cap for transient |
| E3 | Can EMI from boost converter affect ESP32? | Check L1-to-ESP32 distance, GND plane shielding on In1.Cu |
| E4 | Is antenna keepout zone clear? | Run verify_antenna_keepout.py, check no copper within 5mm |
| E5 | Can button bounce cause false triggers? | 100nF debounce caps + firmware debounce (typically 20ms) |
| E6 | Is ESD protection adequate on exposed connectors? | USB: USBLC6-2SC6 TVS, SD card: internal to TF-01A module |
## Electrical Review Report
**Board**: ESP32 Emu Turbo v3.x
**Date**: [date]
### Automated Checks
| Script | Result | Tests |
|--------|--------|-------|
| verify_strapping_pins.py | PASS/FAIL | X/Y |
| verify_decoupling_adequacy.py | PASS/FAIL | X/Y |
| verify_power_sequence.py | PASS/FAIL | X/Y |
| spice_power_check.py | PASS/FAIL | X/Y |
### Manual Review
| Section | OK | CONCERN | RISK |
|---------|----|---------|----- |
| A. Pre-Power (4) | X | X | X |
| B. Power-Up (5) | X | X | X |
| C. ESP32 Boot (6) | X | X | X |
| D. Runtime (9) | X | X | X |
| E. Edge Cases (6) | X | X | X |
### Critical Issues (RISK)
[List any RISK verdicts with evidence]
### Concerns (CONCERN)
[List any CONCERN verdicts with evidence]
### Overall Verdict: PASS / CONDITIONAL PASS / FAIL
| File | Purpose |
|---|---|
scripts/verify_strapping_pins.py | ESP32-S3 boot pin configuration (12 tests) |
scripts/verify_decoupling_adequacy.py | IC decoupling per datasheet (25 tests) |
scripts/verify_power_sequence.py | Power chain and sequencing (26 tests) |
scripts/spice_power_check.py | SPICE simulation of power rails |
scripts/generate_schematics/config.py | GPIO mapping (source of truth) |
scripts/generate_pcb/routing.py | PULL_UP_REFS, NET_ID, pad nets |
software/main/board_config.h | Firmware pin definitions |
hardware/datasheet_specs.py | Component pin-to-net specs |