Initial KiCad project

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+# TXB0104PWR Datasheet Reference
+
+Based on the official TXB0104 datasheet: [TXB0104 Datasheet](https://www.ti.com/lit/ds/symlink/txb0104.pdf)
+
+## Key Specifications
+
+### Power Supply Requirements
+
+- **VCCA (A Port):** 1.2V to 3.6V
+  - **Our design:** 3.3V (for ESP32)
+  - **Pin:** Pin 12 (VCCA)
+- **VCCB (B Port):** 1.65V to 5.5V
+  - **Our design:** 5V (for AC communication)
+  - **Pin:** Pin 11 (VCCB)
+- **Critical:** VCCA must NOT exceed VCCB
+  - **Our design:** 3.3V ≤ 5V ✓ (correct)
+
+### Pin Configuration (TSSOP-14 Package - TXB0104PW)
+
+| Pin | Name | Function | Our Connection |
+|-----|------|----------|----------------|
+| 1 | A1 | A Port 1 (Low Voltage) | ESP32 GPIO17 (TX) |
+| 2 | A2 | A Port 2 (Low Voltage) | ESP32 GPIO16 (RX) |
+| 3 | A3 | A Port 3 (Low Voltage) | NC (Not Connected) |
+| 4 | A4 | A Port 4 (Low Voltage) | NC (Not Connected) |
+| 5 | GND | Ground | GND |
+| 6 | B4 | B Port 4 (High Voltage) | NC (Not Connected) |
+| 7 | B3 | B Port 3 (High Voltage) | NC (Not Connected) |
+| 8 | B2 | B Port 2 (High Voltage) | AC TX (J1 Pin 3) |
+| 9 | B1 | B Port 1 (High Voltage) | AC RX (J1 Pin 2) |
+| 10 | OE | Output Enable | +3V3 (VCCA) |
+| 11 | VCCB | B Port Power Supply | +5V |
+| 12 | VCCA | A Port Power Supply | +3V3 |
+| 13 | GND | Ground | GND |
+| 14 | GND | Ground | GND |
+
+### Critical Design Requirements
+
+#### 1. Output Enable (OE) Pin
+
+**Per Datasheet:**
+- **OE input circuit is referenced to VCCA** (not VCCB)
+- **When OE is LOW:** All outputs are in high-impedance state
+- **When OE is HIGH:** Device is enabled
+- **Power-up/down:** OE must be tied to GND through a pulldown resistor to ensure high-impedance during power transitions
+
+**Our Design:**
+- **OE (Pin 10):** Connected to +3V3 (VCCA) ✓
+- **Note:** We connect OE directly to VCCA (3.3V), which keeps the device always enabled
+- **Alternative:** Could add pulldown resistor for power-up safety, but direct connection to VCCA is acceptable for always-on operation
+
+**Recommendation:**
+- Current design (OE → +3V3) is correct for always-enabled operation
+- Optional: Add 10kΩ pulldown resistor from OE to GND for power-up safety (not critical if power sequencing is controlled)
+
+#### 2. Power Supply Sequencing
+
+**Per Datasheet:**
+- VCCA must not exceed VCCB
+- VCC isolation: If either VCC input is at GND, all outputs are in high-impedance state
+- IOFF supports partial power-down mode
+
+**Our Design:**
+- VCCA = 3.3V, VCCB = 5V ✓ (3.3V ≤ 5V, correct)
+- Both supplies come from same source (J1 Pin 1 = +5V)
+- 3.3V is derived from 5V via regulator
+- Power sequencing: 5V comes first, then 3.3V (via regulator) - this is acceptable
+
+#### 3. Bidirectional Translation
+
+**Per Datasheet:**
+- Automatic direction sensing
+- No direction control needed
+- Works bidirectionally on A and B ports
+
+**Our Design:**
+- A1 (Pin 1) ↔ B1 (Pin 9): ESP32 TX ↔ AC RX ✓
+- A2 (Pin 2) ↔ B2 (Pin 8): ESP32 RX ↔ AC TX ✓
+- Automatic direction sensing handles UART communication ✓
+
+#### 4. Decoupling Capacitors
+
+**Per Datasheet:**
+- Recommended: 0.1µF (100nF) ceramic capacitor on VCCA
+- Recommended: 0.1µF (100nF) ceramic capacitor on VCCB
+- Place as close as possible to power pins
+
+**Our Design:**
+- VCCA (Pin 12): Should have 100nF capacitor to GND
+- VCCB (Pin 11): Should have 100nF capacitor to GND
+- **Note:** These are not explicitly listed in our component list - should be added
+
+**Recommendation:**
+- Add C14: 100nF from VCCA (Pin 12) to GND
+- Add C15: 100nF from VCCB (Pin 11) to GND
+
+### Electrical Characteristics
+
+- **Low Power Consumption:** 5µA maximum ICC
+- **ESD Protection:** ±15kV on B port
+- **Latch-up Performance:** Exceeds 100mA per JESD 78, Class II
+- **Operating Temperature:** -40°C to +85°C
+
+### Package Information
+
+**TXB0104PW (TSSOP-14):**
+- **Package:** TSSOP (14-pin)
+- **Body Size:** 5.00mm × 4.40mm
+- **Height:** 1.2mm max
+- **Lead Pitch:** 0.65mm (fine pitch)
+- **Footprint:** `Package_SO:TSSOP-14_4.4x5mm_P0.65mm` ✓
+
+### PCB Layout Recommendations
+
+**Per Datasheet:**
+1. **Decoupling capacitors:** Place 100nF ceramic capacitors as close as possible to VCCA and VCCB pins
+2. **Ground plane:** Use ground plane for GND pins (5, 13, 14)
+3. **Trace routing:** Keep A and B port traces short and matched length if possible
+4. **Thermal:** No special thermal considerations needed (low power device)
+
+### Design Verification
+
+**Our Design vs Datasheet:**
+
+| Requirement | Datasheet | Our Design | Status |
+|-------------|-----------|------------|--------|
+| VCCA voltage | 1.2V to 3.6V | 3.3V | ✓ |
+| VCCB voltage | 1.65V to 5.5V | 5V | ✓ |
+| VCCA ≤ VCCB | Required | 3.3V ≤ 5V | ✓ |
+| OE connection | VCCA referenced | +3V3 (VCCA) | ✓ |
+| Package | TSSOP-14 | TSSOP-14 | ✓ |
+| Decoupling caps | 100nF on VCCA/VCCB | **Missing** | ⚠️ Should add |
+
+### Missing Components
+
+**Should Add:**
+- **C14:** 100nF ceramic capacitor from VCCA (Pin 12) to GND
+- **C15:** 100nF ceramic capacitor from VCCB (Pin 11) to GND
+
+**Optional (for power-up safety):**
+- **R7:** 10kΩ pulldown resistor from OE (Pin 10) to GND (optional, not critical)
+
+### References
+
+- **Official Datasheet:** [TXB0104 Datasheet](https://www.ti.com/lit/ds/symlink/txb0104.pdf)
+- **Package Information:** TSSOP-14 (TXB0104PW)
+- **Application Note:** See datasheet section 8 for typical applications
+
+