Project Startup Help
Thought for 5 mins 28 sec
They’re still running. I’ll check final status once more and then give you the project links and current state so you’re not blocked waiting.
Worked for 21 sec
Created two separate PCB projects and started the split/place work in each:
- TX board: /timbochu/munkrofon-tx-pcb
- RX board: /timbochu/munkrofon-rx-pcb
Current status:
- TX clone: RX circuitry removed, board-mounted XLR replaced with compact XLR harness pads, 25 × 80 mm / 4-layer target set, placement still running.
- RX clone: TX circuitry removed, board-mounted XLR replaced with compact XLR harness pads, 25 mm width / 4-layer target set, placement still running.
- Master project remains unchanged as the system/reference design.
Open item:
- Both split-placement tasks are still running; they exceeded the wait window but are actively working on non-RF placement and verification.
Next step:
- Open each project link later to review the completed thread result, or ask me to check their status again.
Check split projects
Check TX status
Check RX status
Fix failed split tasks
Compare split BOMs
Refine this doc
Ask about this doc
Phase 2 Decision Package — Component Matrix, Power States, Change List
Project: Munkrofon
Baseline: Prototype Revision A schematic, ERS v1.0, Engineering Review Report — Phase 2
Status: Review deliverables 2, 3, 4, and 6 combined into one minimal decision package
Schematic/layout changes made: None
Baseline: Prototype Revision A schematic, ERS v1.0, Engineering Review Report — Phase 2
Status: Review deliverables 2, 3, 4, and 6 combined into one minimal decision package
Schematic/layout changes made: None
Executive Summary
Rev A is a valid exploratory prototype, but the next schematic revision should focus on reducing RF integration risk, fixing power architecture weaknesses, reducing current draw, and adding missing professional-audio protection. The highest-risk current choices are the provisional RTX1090R1 integration, the AP2112K 3.3 V LDO directly from a 1S battery system rail, the always-present ±5 V split rails, incomplete XLR protection, and unresolved USB/RF/codec interface decisions.
Main recommendations:
- KEEP / CONDITIONAL KEEP RTX1090R1 as lead RF candidate, but do not freeze RF layout without RTX/RMED integration docs.
- REPLACE / RE-ARCHITECT the 3.3 V rail strategy before PCB layout.
- MODIFY split-rail analog power; likely remove or gate TX ±5 V unless justified by final mic-preamp choice.
- MODIFY XLR input/output protection before layout.
- MAKE OPTIONAL / DNP the MAX17048 fuel gauge unless the firmware/UI path is confirmed.
1. Component Comparison Matrix
1.1 RF Module
Table
| Candidate | Technical suitability | Audio performance | Power | PCB area | Availability / support | Complexity | Cost impact | Recommendation |
|---|---|---|---|---|---|---|---|---|
| RTX1090R1 | Best fit to DECT/pro-audio requirement if Sheerlink docs are available. | Public claims support 24-bit/48 kHz and low single-digit to <7 ms latency, but exact implementation is gated. | Public typical talk currents around 32–38 mA excluding codec/load; final current firmware-dependent. | Compact 15.4 × 21.6 mm, but antenna/diversity area may dominate. | Official support package required; currently documentation-gated. | High until SDK, codec, antenna, and reference layout obtained. | Likely moderate/high, commercial engagement likely. | KEEP — CONDITIONAL. Leading candidate only; do not production-freeze. |
| Renesas DA14AVDDECT-SF01 | Strong public datasheet candidate, integrated codec/features. | Latency not publicly proven for pro mic use. | Integrated features may reduce external ICs, but exact modes unknown. | 17 × 26.65 mm module challenges 25 mm width. | Better public datasheet, unclear full reference files. | Medium. | Unknown. | BACKUP ONLY. Use if RTX path fails. |
| SC14WAMDECT | Technically relevant but legacy. | Known ~14–18 ms class latency; bandwidth limited. | Acceptable for older PA/tour-guide. | Module-friendly. | NRND / not for new designs. | Medium. | Low/moderate but poor lifecycle. | REJECT. |
Decision: Keep RTX1090R1 as leading candidate, but maintain replaceable RF boundary.
1.2 Codec / ADC / DAC
Table
| Candidate | Technical suitability | Audio performance | Power | PCB area | Availability / support | Complexity | Cost impact | Recommendation |
|---|---|---|---|---|---|---|---|---|
| TLV320AIC3204 | Flexible codec with ADC/DAC and digital audio interface. | Capable for 48 kHz prototype; final SNR/THD not yet validated. | Moderate; depends heavily on configuration. | QFN-32, acceptable but not minimal. | Available and documented. | High firmware/clocking complexity. | Moderate. | KEEP — CONDITIONAL / MODIFY. Keep unless RTX/RMED specifies another codec. |
| TI/Cirrus/AKM simpler mono ADC/DAC | Could better match mono TX/RX. | Potentially equal or better if selected for low latency/noise. | May be lower. | Could reduce area. | Depends on part. | Medium. | Similar. | REVIEW BEFORE LAYOUT. |
| RTX/RMED recommended codec | Best integration confidence if supplied. | Expected best for Sheerlink. | Unknown. | Unknown. | Requires vendor docs. | Lowest integration risk once docs obtained. | Unknown. | PREFERRED IF VENDOR-SPECIFIED. |
Decision: Conditional keep. Do not finalize codec until RF/audio clocking is confirmed.
1.3 Microphone Preamp
Table
| Candidate | Technical suitability | Audio performance | Power | PCB area | Availability / support | Complexity | Cost impact | Recommendation |
|---|---|---|---|---|---|---|---|---|
| THAT1580 | Excellent professional mic-preamp fit. | Strong low-noise differential architecture. | Requires dual rails; increases system power. | QFN plus split rail support increases area. | Good pro-audio part. | Medium/high due to rails/protection. | Moderate/high. | KEEP / MODIFY. Keep for audio quality; add protection and reassess rails. |
| THAT1512 / THAT1510 | Proven mic preamp family. | Good pro-audio performance. | May simplify versus 1580 depending topology. | Possibly simpler. | Good. | Medium. | Moderate. | COMPARE FURTHER. |
| INA217 / INA163-class | Classic instrumentation mic-preamp approach. | Good, mature. | Usually dual supply; power varies. | Moderate. | Good. | Medium. | Moderate. | POSSIBLE ALTERNATIVE. |
| INA333 | Low-power instrumentation amp. | Lower-noise/headroom fit for pro dynamic mic is weaker than THAT options. | Low. | Small. | Good. | Low. | Low/moderate. | NOT PRIMARY for pro audio. Consider only if runtime dominates. |
Decision: Keep THAT1580 for now, but add phantom/RFI/ESD protection and validate gain/headroom.
1.4 Balanced Line Driver
Table
| Candidate | Technical suitability | Audio performance | Power | PCB area | Availability / support | Complexity | Cost impact | Recommendation |
|---|---|---|---|---|---|---|---|---|
| THAT1646 | Strong fit for true balanced pro XLR output. | Good professional line-driver performance. | Requires dual rails; output current depends on level/load. | Small IC, but rail/protection circuitry adds area. | Good. | Medium. | Moderate. | KEEP / MODIFY. Define output level and protection. |
| DRV134-class | Similar balanced line-driver role. | Good, mature. | Similar rail burden. | Similar. | Good. | Medium. | Moderate. | BACKUP. |
| Fully differential op amp | Flexible, may optimize noise/current. | Potentially excellent if designed well. | Part-dependent. | More passives. | Good. | Higher analog design effort. | Moderate. | CONSIDER if output target changes. |
| Pseudo-balanced output | Simple and low power. | Lower professional robustness. | Low. | Low. | Easy. | Low. | Low. | REJECT unless product goal changes. |
Decision: Keep THAT1646 if final output target is true professional balanced line output.
1.5 Battery Charger / Power Path
Table
| Candidate | Technical suitability | Audio performance impact | Power / thermal | PCB area | Availability / support | Complexity | Cost impact | Recommendation |
|---|---|---|---|---|---|---|---|---|
| BQ24074 | Good 1S charger with power path. | Linear charger noise manageable; thermal/noise review still needed. | 500 mA charge may create heat but reasonable. | VQFN plus passives. | Good. | Medium. | Moderate. | KEEP / MODIFY. Add NTC/protection/off-state review. |
| MCP73831-class simple charger | Simpler charger. | Less power-path functionality. | Simpler but cannot manage system/load as well. | Smaller. | Excellent. | Low. | Low. | REPLACE only if operation-while-charging not needed. |
| Switching charger | Better thermal efficiency. | More EMI risk near audio/RF. | Better at high charge current. | Larger/more complex. | Good. | High. | Higher. | Only if thermal demands it. |
Decision: Keep BQ24074-class charger/power path.
1.6 Voltage Regulators / Rails
Table
| Component | Technical suitability | Audio/RF impact | Power | PCB area | Availability | Complexity | Cost impact | Recommendation |
|---|---|---|---|---|---|---|---|---|
| AP2112K 3.3 V LDO | Simple but weak from 1S battery due dropout. | Low noise when in regulation. | Poor runtime/low-battery use. | Small. | Excellent. | Low. | Low. | REPLACE / RE-ARCHITECT. Use buck-boost or lower-voltage strategy. |
| TPS65131 ±5 V split rail | Supports selected dual-rail audio parts. | Switching noise risk; layout-critical. | Significant runtime burden if always on. | Large support network. | Good. | High. | Moderate/high. | MODIFY. Gate rails; likely remove TX split rail if possible. |
| Buck-boost 3.3 V alternative | Best for full battery range. | More switching noise, can be filtered. | Better battery utilization. | Moderate. | Good. | Medium. | Moderate. | STRONGLY RECOMMENDED. |
Decision: Rework power architecture before layout.
1.7 Fuel Gauge
Table
| Candidate | Suitability | Performance / UX | Power | PCB area | Support | Complexity | Cost | Recommendation |
|---|---|---|---|---|---|---|---|---|
| MAX17048 | Good 1S gauge. | Useful if battery status is shown/logged. | Very low. | Small but nonzero. | Good. | Adds I²C/firmware dependency. | Moderate. | MAKE OPTIONAL / DNP. |
| ADC battery monitor | Good enough for simple low-battery warning. | Lower SOC accuracy. | Low. | Very low. | Depends on RF ADC. | Low. | Low. | PREFERRED if UX is simple. |
| Charger status only | Simplest. | Poor runtime estimate. | Lowest. | Lowest. | Easy. | Low. | Low. | OK only for minimal prototype. |
Decision: Make MAX17048 optional unless firmware/UI path is confirmed.
2. Power-State Analysis
These are planning estimates, not measured values. They assume the current Rev A architecture remains: RTX1090R1 + TLV320AIC3204 + BQ24074 + AP2112K + TPS65131 rails + optional MAX17048. Actual current will change after RF firmware, rail gating, and audio output level are defined.
2.1 State Table
Table
| State | Active rails / blocks | Approx TX current | Approx RX current | Wake source | Notes |
|---|---|---|---|---|---|
| Off | Battery connected; charger may be unpowered; no defined load switch/ship mode. | Unknown, target <100 µA | Unknown, target <100 µA | USB insert or power control | Rev A lacks explicit ship/off load disconnect. |
| USB Connected | USB VBUS, charger input, charger status, possible SYS rail. | 5–30 mA + charge current | 5–30 mA + charge current | USB VBUS | Depends whether system powers up automatically on USB. |
| Charging | BQ24074 active, battery charging up to ~500 mA, SYS available. | System load + up to 500 mA charge | System load + up to 500 mA charge | USB / charger status | Thermal check required in compact enclosure. |
| Idle | RF idle, codec/control available, 3.3 V rail active, fuel gauge optional, analog rails ideally off. | 25–60 mA | 25–70 mA | RF event, button, USB, timer | Requires rail gating not currently explicit. |
| Paired | RF synchronized/paired, codec clocks may be ready, analog rails may remain off or low-power. | 45–85 mA | 45–95 mA | Audio start, RF command, user action | Depends on RTX firmware state. |
| Streaming | RF talk/streaming, codec active, audio analog chain active, ± rails active. | 95–140 mA | 110–170 mA | RF/audio control, low battery, user action | Current Rev A worst normal operating state. |
| Low Battery | Same as active state but with warning behavior and possible output power reduction. | Streaming current + warning load | Streaming current + warning load | Fuel gauge / ADC / RF firmware | Must define threshold and behavior. |
| Sleep | RF low-power, codec off, analog rails off, gauge optional. | 0.2–3 mA target | 0.2–3 mA target | RF wake, button, USB, charger | Depends heavily on RF module firmware and power gating. |
| Shutdown | Load switch/ship mode ideally disconnects system; charger still handles USB insert. | <10–50 µA target | <10–50 µA target | USB insert / power button | Not implemented explicitly in Rev A. |
2.2 Streaming Current Estimate
Table
| Unit | Conservative Rev A estimate | Main contributors |
|---|---|---|
| Transmitter | ~120 mA average planning value | RTX module, codec ADC, THAT1580, TPS65131 losses, 3.3 V rail loss, fuel gauge/control. |
| Receiver | ~140 mA average planning value | RTX module, codec DAC, THAT1646, TPS65131 losses, 3.3 V rail loss, fuel gauge/control. |
2.3 Updated Runtime Estimates
Assumptions:
- Usable battery capacity derated to 85% for real-world cutoff, aging, regulator dropout, and margin.
- TX average streaming current: 120 mA.
- RX average streaming current: 140 mA.
- These are estimates for current Rev A, not optimized architecture.
Table
| Battery capacity | Usable capacity assumption | TX runtime @120 mA | RX runtime @140 mA |
|---|---|---|---|
| 800 mAh | 680 mAh | ~5.7 h | ~4.9 h |
| 1000 mAh | 850 mAh | ~7.1 h | ~6.1 h |
| 1200 mAh | 1020 mAh | ~8.5 h | ~7.3 h |
2.4 Optimized Runtime Opportunity Estimate
If the next schematic revision replaces the 3.3 V LDO strategy, gates/removes unnecessary ±5 V rails, and makes the fuel gauge optional, rough streaming currents could plausibly move toward:
Table
| Unit | Optimized target current | 800 mAh | 1000 mAh | 1200 mAh |
|---|---|---|---|---|
| TX optimized target | 75–95 mA | ~7.2–9.1 h | ~8.9–11.3 h | ~10.7–13.6 h |
| RX optimized target | 90–115 mA | ~5.9–7.6 h | ~7.4–9.4 h | ~8.9–11.3 h |
2.5 Biggest Runtime Improvement Opportunities
- Replace AP2112K-from-1S strategy with a buck-boost or better rail architecture to use more battery capacity.
- Gate or remove TX ±5 V rails if a lower-power mic front-end can meet audio goals.
- Gate RX ±5 V rails so THAT1646 rails are active only when streaming/output is enabled.
- Make MAX17048 optional unless battery SOC is actually used.
- Decide USB data role and avoid powering/routing unused interfaces.
- Use RF firmware low-power states aggressively once RTX/RMED confirms behavior.
- Define output level target; lower output-level requirement may reduce RX rail current.
3. Prioritised Schematic Change List
No changes should be made automatically. This list is for approval before schematic refinement.
HIGH — Required Before PCB Layout
Table
| ID | Recommendation | Reason | Expected benefit | PCB complexity | Power impact | Cost impact | Risk impact |
|---|---|---|---|---|---|---|---|
| HIGH-001 | Obtain RTX/RMED integration package or freeze RF block as non-layout-ready. | Current RF/audio/antenna implementation is provisional. | Prevents invalid RF layout and wrong codec pin mapping. | May change RF/codec routing. | Unknown. | Unknown/vendor-dependent. | Major risk reduction. |
| HIGH-002 | Replace/re-architect 3.3 V rail strategy. | AP2112K from 1S battery loses regulation as battery discharges. | Better runtime and reliability. | Moderate; add buck-boost or preregulator. | Improves usable battery capacity. | Moderate increase. | High risk reduction. |
| HIGH-003 | Define RX output level/headroom target. | THAT1646 rail voltage and output suitability depend on target level. | Prevents under/over-designed output stage. | May change RX analog rails. | Could reduce or increase rail current. | Low/moderate. | High audio risk reduction. |
| HIGH-004 | Add TX XLR input phantom-power abuse, ESD, and RFI protection. | Dynamic mic target does not prevent accidental phantom-powered cable use. | Protects preamp and improves stage robustness. | Moderate passives/clamps. | Minimal. | Low/moderate. | High reliability improvement. |
| HIGH-005 | Add RX XLR output RFI/ESD/cable-abuse protection and pin-1/chassis strategy. | Long stage cables and mixer inputs are hostile EMC paths. | Better EMC/audio robustness. | Moderate. | Minimal. | Low/moderate. | High risk reduction. |
| HIGH-006 | Resolve/justify remaining ERC missing-power findings. | Current ERC still reports power-source caveats. | Prevents hidden power mistakes before layout. | Low/moderate. | None directly. | None/low. | High review confidence. |
| HIGH-007 | Decide USB role: charge-only vs debug/update. | D+/D− are protected but unused; final role affects routing and firmware. | Avoids rework in layout. | Low/moderate. | Minimal. | Low. | Medium/high risk reduction. |
| HIGH-008 | Define test-point strategy for rails, RF debug, codec clocks, battery, charger, audio I/O. | Bring-up will be difficult without test access. | Faster prototype debugging. | Adds area. | Minimal. | Low. | High serviceability improvement. |
MEDIUM — Strongly Recommended
Table
| ID | Recommendation | Reason | Expected benefit | PCB complexity | Power impact | Cost impact | Risk impact |
|---|---|---|---|---|---|---|---|
| MED-001 | Reassess whether TX needs THAT1580 + ±5 V rails. | TX rail burden may be excessive for battery product. | Better runtime and smaller PCB. | Could reduce complexity if simplified. | Potentially large improvement. | May reduce cost. | Medium risk reduction. |
| MED-002 | Gate TX and RX ±5 V rails with explicit enable control. | Always-on analog rails waste power. | Better idle/paired/sleep runtime. | Adds control routing/components. | Significant improvement. | Low/moderate. | Medium risk reduction. |
| MED-003 | Make MAX17048 optional/DNP until firmware/UI path confirmed. | Fuel gauge may not be used. | Reduces BOM/firmware burden if omitted. | Adds DNP option; may reduce active design. | Small improvement. | Reduces cost if DNP. | Medium risk reduction. |
| MED-004 | Confirm TLV320AIC3204 clocking and codec suitability against RTX/RMED requirements. | Current I²S/MCLK mapping is provisional. | Avoids nonfunctional digital audio path. | May require rewiring/replacement. | Unknown. | Unknown. | High technical risk reduction. |
| MED-005 | Add VBUS protection strategy: fuse/load switch/TVS/inrush as appropriate. | USB-C VBUS is user-exposed. | Better safety and robustness. | Low/moderate. | Small voltage drop depending part. | Low/moderate. | Medium risk reduction. |
| MED-006 | Lock passive packages, ratings, tolerances, dielectric, and current ratings. | Current BOM contains many generic passives. | Manufacturing-ready BOM. | No schematic topology change, but package choices affect layout. | None directly. | May change cost. | Medium manufacturability improvement. |
| MED-007 | Add optional/DNP pads for uncertain RF/audio interface pins. | RTX integration may change. | Reduces respin risk. | Adds area. | Minimal. | Low. | Medium/high risk reduction. |
| MED-008 | Define low-battery behavior and thresholds. | Fuel gauge/ADC/firmware behavior is undefined. | Better UX and battery protection. | Low. | Could improve runtime. | Low. | Medium risk reduction. |
LOW — Nice-to-Have Optimization
Table
| ID | Recommendation | Reason | Expected benefit | PCB complexity | Power impact | Cost impact | Risk impact |
|---|---|---|---|---|---|---|---|
| LOW-001 | Evaluate removing unused USB data ESD if final product is charge-only. | D+/D− protection may be unnecessary. | Slight BOM/area reduction. | Reduces complexity. | None. | Small cost reduction. | Low risk if charge-only confirmed. |
| LOW-002 | Add status LEDs only if UX requires them. | LEDs consume power and space. | Better UX if needed. | Low. | Slight runtime penalty. | Low. | Low. |
| LOW-003 | Consider shared reference design blocks between TX and RX where possible. | Reduces engineering effort. | Better consistency. | Neutral. | Neutral. | Neutral. | Low/medium. |
| LOW-004 | Optimize connector mechanical strategy after enclosure direction is known. | XLR/USB/battery access affects serviceability. | Better durability and assembly. | Layout/mechanical dependent. | None. | Varies. | Medium mechanical risk reduction. |
Approval Gate
Before schematic refinement, approve or reject the HIGH items above. Recommended approval bundle for the next Agent-mode schematic pass:
- Replace/rework 3.3 V rail strategy.
- Add XLR input/output protection strategy.
- Add test points.
- Make fuel gauge optional/DNP.
- Add rail enable/gating strategy for ±5 V rails.
- Keep RTX1090R1 provisional but do not route final RF/antenna layout until vendor docs arrive.
Phase 2 Decision Package — Component Matrix, Power States, Change List
Executive Summary
1. Component Comparison Matrix
1.1 RF Module
1.2 Codec / ADC / DAC
1.3 Microphone Preamp
1.4 Balanced Line Driver
1.5 Battery Charger / Power Path
1.6 Voltage Regulators / Rails
1.7 Fuel Gauge
2. Power-State Analysis
2.1 State Table
2.2 Streaming Current Estimate
2.3 Updated Runtime Estimates
2.4 Optimized Runtime Opportunity Estimate
2.5 Biggest Runtime Improvement Opportunities
3. Prioritised Schematic Change List
HIGH — Required Before PCB Layout
MEDIUM — Strongly Recommended
LOW — Nice-to-Have Optimization
Approval Gate
