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Add hall sensor circuit design, NTAG5 config check tool, I2C bus docs

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- Hall sensor + LP5562 EN wired-AND circuit design (DRV5032FB/FE,
  1M pull-up, open-drain topology) with three interaction modes:
  boot-time recovery, tap-to-swap, hold-to-confirm recovery
- NTAG5 config check tool (tools/ntag5_config_check.py) using
  uFCoder library for ISO15693 transparent mode via uFR Zero reader.
  Supports inventory + addressed mode for multi-tag fields.
- Updated DEVELOPMENT_PLAN with I2C bus management notes for
  LP5562 (0x30) + NTAG5Link (0x54) shared bus
- Updated README with wired-AND hardware diagram, hall sensor
  interaction section, and updated wiring table
- Updated CLAUDE.md with LP5562 EN wired-AND topology docs
- Updated STATUS.md with hall sensor decisions and hardware inventory

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
michael
2026-03-03 14:06:11 -08:00
parent e4195d2583
commit db492050e3
8 changed files with 874 additions and 50 deletions
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10
CLAUDE.md
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@@ -66,6 +66,8 @@ The LP5562 driver does NOT enforce timing delays internally — the caller is re
## Key I2C Addresses
Both devices share the same I2C bus (A4/A5). Non-conflicting addresses — no bus arbitration issues.
| Device | Address | Notes |
|--------|---------|-------|
| LP5562 | 0x30 | ADDR_SEL pins both low (LP5562EVM default) |
@@ -95,9 +97,11 @@ Key config constants (from `../ntag5sensor/vicinity/ntag5link.py`):
|----------|------------|----------|
| A4 (SDA) | LP5562 SDA, NTAG5 SDA | Shared I2C data |
| A5 (SCL) | LP5562 SCL, NTAG5 SCL | Shared I2C clock |
| D0/A0 | LP5562 EN | Hardware enable (GPIO, active high) |
| TBD | NTAG5 FD pin | Field detect / SRAM write indication (EIC wake) |
| TBD | Hall sensor | Recovery mode trigger (EIC wake) |
| D0/A0 | LP5562 EN line (open-drain) | Wired-AND with hall sensor, pull-up to VCC |
| TBD (EIC) | Hall sensor output | EIC wake + wired-AND to LP5562 EN line |
| TBD (EIC) | NTAG5 FD pin | Field detect / SRAM write indication (EIC wake) |
**LP5562 EN wired-AND**: D0/A0 (open-drain) and hall sensor (open-drain, active-low) both connect to LP5562 EN with a 1M pull-up. Either can force EN low. Magnet kills LEDs at hardware level regardless of MCU state.
## Testing