#Goal

- Finalize the wiring and documentation for the ADS1298 12‑lead ECG AFE system with isolated USB FS (data and power), SPI isolation, and optimized ADS1298 clocks/references. Produce two selectable variants: Variant A (minimal design) and Variant B (serviceable design) while generating a complete BOM (with HV/patient flags), DB15 pinout documentation, layout strategies for 2/4/6 layer PCBs, and an IEC 60601 safety checklist. Resolve any remaining ERC issues.

#Implementation plan

1. **USB FS and Isolation Implementation**

1. Confirm and finalize isolated USB wiring by strapping the ADUM4160 for USB FS data and power.

2. Verify proper host/patient net routing and appropriate isolation boundaries using the isolated DC/DC (REM2A‑0505S) and proper decoupling (e.g., TPS78233DDC).

3. Update schematic wiring and annotate test points related to isolated power rails.

2. **ADS1298 Clock and Reference Network Finalization**

1. Complete wiring for ADS1298 clocks and reference filters including VCX capacitors (C11-C14 on VCAP1-4).

2. Implement anti-alias RC networks and RLD circuitry per design specifications.

3. Add designated test points for clock/ref networks and verify signal integrity.

3. **SPI Isolation Wiring and ERC Resolution**

1. Finalize SPI wiring using the digital isolator (Si8641BB‑B‑IS1) to handle control/status signals.

2. Connect and secure SPI signals ensuring all required nets are routed correctly.

3. Review and resolve remaining ERC issues related to SPI signal integrity in the schematic.

4. **Variant A (Minimal) and Variant B (Serviceable) Implementation**

1. Integrate jumpers and test pads to create two selectable design variants:

1. Variant A: Minimal design with essential connectivity and compact layout.

2. Variant B: Serviceable design with enhanced testability and easier access to critical nets and components.

2. Annotate patient/HV flagged parts appropriately, ensuring compliance with safety requirements.

5. **Documentation, BOM, and Layout Strategy**

1. Generate a complete BOM including part numbers, HV/patient flags, and relevant notes.

2. Document the DB15 pinout and annotate critical connections.

3. Provide layout guidelines for 2/4/6-layer PCB strategies based on constraints of noise, isolation, and routing.

4. Integrate an IEC 60601 safety checklist to ensure design compliance with medical safety standards.

#Success criteria

- The ADS1298 AFE schematic displays proper isolated USB FS wiring, confirmed host/patient, and all required decoupling.

- The ADS1298 clocks and reference networks are correctly implemented with test points.

- SPI isolation wiring is complete and all ERC issues are resolved.

- Two design variants (A and B) with clear documentation and annotated jumpers are available.

- The BOM, DB15 pinout, PCB layout strategies, and IEC 60601 checklist are finalized and integrated into project documentation.

#Goal

- Finalize the ADS1298-based 12‑lead ECG AFE design with isolated USB FS (data + power), SPI isolation, and comprehensive clock/reference routing. Implement two design variants: Variant A (minimal) for production and Variant B (serviceable) with expanded test points/jumpers. Generate a complete BOM with high-voltage (HV)/patient circuit flags, detailed DB15 pinout documentation, and layer layout strategies for 2, 4, and 6 layers, while ensuring compliance with IEC 60601 safety standards and clearing ERC/DRC.

#Implementation plan

1. **Finalize Wiring and Connections**

1. Connect USB isolator configuration pins (strap USB isolator pins).

2. Complete isolated power decoupling and filter networks for both power and clock reference signals.

3. Finalize the ADS clock, reference, RLD, and anti-alias filter networks as per datasheet specifications.

2. **Validate Isolation Boundaries and Mark Keepout Areas**

1. Confirm all patient, HV, and USB isolation nets are correctly routed and isolated.

2. Clearly mark isolation boundaries and keepouts on the schematic and layout.

3. **Implement Variant Designs

1. For Variant A (minimal):

1. Add essential test points and minimal jumpers for critical connectivity.

2. For Variant B (serviceable):

1. Include additional test points, jumpers, and annotated connectors to facilitate service and debugging.

4. **Generate Documentation and BOM**

1. Create a detailed BOM that flags HV and patient-related components.

2. Produce the DB15 pinout documentation with clear signal direction and assignments.

3. Outline layout strategies for 2-layer, 4-layer, and 6-layer board options.

4. Compile the IEC 60601 safety checklist and ensure all aspects are met.

5. **Clear ERC/DRC and Update Project Docs**

1. Run ERC/DRC for both schematic and layout, and resolve all flagged issues.

2. Update the project documentation to reflect the changes and compliance.

#Success criteria

- Final wiring and net configurations meet ADS1298 and USB isolation requirements according to the datasheet.

- Isolation boundaries and keepouts are marked and verified.

- Two implementable variants (A: minimal, B: serviceable) are integrated with necessary test points and jumpers.

- BOM, DB15 pinout, layout strategies, and IEC 60601 checklist are fully documented and included in the project.

- Schematic and layout pass ERC/DRC without errors.