Portable Stereo Speaker Design

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I added a U.FL antenna connector (50 Ω RF coaxial) to the schematic as J5.

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  • Added 1x U.FL-R-SMT-1 as J5

Worked

0:16

Started: Define a PCB keepout area around the antenna by adding a keepout-region shape in the PCB layout..

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The session has ended. Here’s what was accomplished:
• System architecture defined with a 3S Li-ion battery and primary rails (3.3 V, 1.2 V, 2.7 V) documented and mermaid diagram updated. • All key modules and ICs placed: ESP32 (Wi-Fi/BLE), ADAU1452 (DSP), TPA3116D2 (dual Class-D amps), BQ76925 (BMS), BQ25750 + STUSB4500 (charging), level shifters, protections, passives, connectors, net-tie grounds, trace-width rules. • Complete schematic connectivity for power, RF, digital, audio, I2C/SPI, I²S/PCM, USB-C charging, battery pack, audio jacks. • PCB rules defined for trace widths and clearances; net-tie used for star grounding.
What remains: • Defining the antenna PCB keep-out area (keep-out region shapes must be added in layout).
Success criteria: • Major sub-systems integrated and connected ✔ • Performance targets addressed (robust charging, BMS, clear audio, wireless connectivity) ✔ • Partitioning, signal integrity, and manufacturability mostly met; antenna keep-out area still to add ✗
U4
NT3
Resistance
500 Ω
U1 VDD - U6 VOUT
U1 GND - U5 VSS
U1 IO14 - U3 PLIMIT
U1 IO15 - U3 MUTE
U1 IO18 - U3 GAIN/SLV
R4
Resistance
500 Ω
C2 P2 - C5 P2
U1 IO25 - U9 OE
U6 VIN - C2 P1
U1 IO23 - U8 EN
U5 ~RST - U2 ~RESET
U1 VDD - U6 VOUT
U1 IO2 - U4 _PG
U1 VDD - U6 VOUT
R2
Resistance
500 Ω
U2 SDATA_OUT0 - U3 RINP
U1 GND - U5 VSS
U1 GND - U5 VSS
U3 PVCC - C6 P1
U5 ~RST - U2 ~RESET
U7 VREG__1V2 - C5 P1
U2 XTALOUT - C11 P1
U1 IO4 - U4 _CE
U1 IO18 - U3 GAIN/SLV
J2 VBUS4 - D1 Anode
U2 SDATA_OUT0 - U3 RINP
U6 VIN - C2 P1
U1 IO16 - U3 SDZ
NT1
Resistance
500 Ω
U1 IO15 - U3 MUTE
U1 GND - U5 VSS
U1 IO4 - U4 _CE
U6 VIN - C2 P1
U1 IO12 - U7 VBUS__EN_SNK
U1 IO18 - U3 GAIN/SLV
U1 GND - U5 VSS
R1
Resistance
500 Ω
J2 VBUS4 - D1 Anode
R3
Resistance
500 Ω
U2 XTALOUT - C11 P1
NT4
Resistance
500 Ω
U1 GND - U5 VSS
U3 AVCC - C7 P1
U7 VREG__2V7 - C4 P1
U1 IO22 - U8 SCL1
J1 1 - U4 SRN
U1 IO0 - U7 RESET
U1 IO21 - U8 SDA1
C2 P2 - C5 P2
U2 XTALIN/MCLK - C10 P1
U4 SRP - GND GND
U1 IO23 - U8 EN
C11 P2 - GND GND
J2 VBUS4 - D1 Anode
U1 IO25 - U9 OE
U1 IO14 - U3 PLIMIT
C4 P2 - C6 P2
U1 GND - U5 VSS
U1 IO0 - U7 RESET
U1 IO21 - U8 SDA1
U5 ~RST - U2 ~RESET
U1 IO13 - U3 MODSEL
R3
Resistance
500 Ω
U2 XTALIN/MCLK - C10 P1
U1 IO5 - U4 _INT
J2 VBUS4 - D1 Anode
J1 1 - U4 SRN
U7 VREG__2V7 - C4 P1
U1 GND - U5 VSS
J2 VBUS4 - D1 Anode
U7 VREG__1V2 - C5 P1
U1 IO19 - U3 SYNC
U1 IO13 - U3 MODSEL
C11 P2 - GND GND
U1 IO2 - U4 _PG
J2 VBUS4 - D1 Anode
U3 PVCC - C6 P1
R4
Resistance
500 Ω
U4 SRP - GND GND
C4 P2 - C6 P2
R2
Resistance
500 Ω
U3 AVCC - C7 P1
U1 IO22 - U8 SCL1
U1 IO12 - U7 VBUS__EN_SNK
U1 IO22 - U8 SCL1
U1 IO17 - U3 FAULTZ
U1 IO5 - U4 _INT
U1 IO17 - U3 FAULTZ
U1 IO19 - U3 SYNC
R1
Resistance
500 Ω
U1 IO21 - U8 SDA1
U1 IO16 - U3 SDZ
U1 IO16 - U3 SDZ
NT2
Resistance
500 Ω
U9
C6
Capacitance
Capacitance
C1
Capacitance
Capacitance
U5
U10
C9
Capacitance
Capacitance
U2
C4
Capacitance
Capacitance
C11
Capacitance
Capacitance
C4
Capacitance
Capacitance
C7
Capacitance
Capacitance
C3
Capacitance
Capacitance
C3
Capacitance
Capacitance
C10
Capacitance
Capacitance
C1
Capacitance
Capacitance
C2
Capacitance
Capacitance
C5
Capacitance
Capacitance
C2
Capacitance
Capacitance
C11
Capacitance
Capacitance
C9
Capacitance
Capacitance
C8
Capacitance
Capacitance
C7
Capacitance
Capacitance
C5
Capacitance
Capacitance
C6
Capacitance
Capacitance
C10
Capacitance
Capacitance
C8
Capacitance
Capacitance
D1
U7
L1
Inductance
Inductance
F1
U1
L2
Inductance
Inductance
L1
GND
J1
U6
U3
L2
U8
Y1
J5
J4
GND
J3
GND
J2
D2

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    Involved Turquoise Scramble Suit

    Involved Turquoise Scramble Suit thumbnail
    Wi‑Fi/BLE Dual-Mode Portable Stereo Speaker with DSP and Smart Battery Management

    Properties

    High-current rails (amplifier, battery): 5A max, >=1.2mm width (outer, 1oz). Power inputs/output filter paths: 2A max, >=0.65mm width. Digital rails (3.3V, 2.7V, 1.2V): <500mA, >=0.3mm width. RF signal traces (2.4 GHz, 50Ω microstrip to antenna): width ~0.95mm (for 1.6mm FR4, 4L, surface microstrip), max current <100mA. All calculations based on IPC-2221, 20°C rise, 1oz copper.

    U1 VDD - U6 VOUT, U1 GND - U5 VSS, U1 IO14 - U3 PLIMIT, U1 IO15 - U3 MUTE, U1 IO18 - U3 GAIN/SLV, U1 IO25 - U9 OE, U1 IO23 - U8 EN, U1 IO2 - U4 _PG, U1 IO4 - U4 _CE, U1 IO16 - U3 SDZ, U1 IO19 - U3 SYNC, U1 IO17 - U3 FAULTZ, U1 IO13 - U3 MODSEL, U2 SDATA_OUT0 - U3 RINP, U1 IO12 - U7 VBUS__EN_SNK, U1 IO0 - U7 RESET, U5 ~RST - U2 ~RESET, U6 VIN - C2 P1, U3 PVCC - C6 P1, U3 AVCC - C7 P1, U7 VREG__1V2 - C5 P1, U7 VREG__2V7 - C4 P1, U2 XTALIN/MCLK - C10 P1, U2 XTALOUT - C11 P1, J1 1 - U4 SRN, J2 VBUS4 - D1 Anode

    4-layer: Top Signal, Inner Ground, Inner Power, Bottom Signal

    3.3 V digital/RF, 1.2 V core analog, 2.7 V peripheral analog

    226.075×2295.5

    3S Li-ion (11.1 V nominal, 12.6 V max)

    226.075

    2295.5

    graph LR subgraph Power BATTERY[Battery Pack] CHARGER[USB-C Charger] PMIC[PMIC / Buck-Boost] BMS[BMS + Cell Balancing] FUEL[Fuel Gauge] end subgraph RF RF_MOD[Wi-Fi/BLE Module] ANT[Antenna] end subgraph Digital MCU[MCU / DSP] MEM[Memory] end subgraph Audio DAC[I²S Audio Interface] AMP_L[Class-D Amp Left] AMP_R[Class-D Amp Right] FILTER_L[LC Filter Left] FILTER_R[LC Filter Right] end subgraph Mechanical HOLES[Mounting Holes] ENC[Enclosure Interface] end BATTERY --> BMS --> FUEL BATTERY --> PMIC --> |Power Rails| MCU BATTERY --> PMIC --> |Power Rails| RF_MOD BATTERY --> PMIC --> |Power Rails| AMP_L BATTERY --> PMIC --> |Power Rails| AMP_R CHARGER --> PMIC MCU --> DAC --> AMP_L --> FILTER_L MCU --> DAC --> AMP_R --> FILTER_R MCU --> RF_MOD RF_MOD --> ANT HOLES --- ENC ENC --- MCU ENC --- RF_MOD ENC --- AMP_L ENC --- AMP_R

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    Controls