Portable Stereo Speaker Design

flux

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

Added 1 component

0:39

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..

flux

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 ✗
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U4
R4
Resistance
500 Ω
R2
Resistance
500 Ω
R1
Resistance
500 Ω
R3
Resistance
500 Ω
R3
Resistance
500 Ω
R4
Resistance
500 Ω
R2
Resistance
500 Ω
R1
Resistance
500 Ω
U6 VIN - C2 P1
U2 SDATA_OUT0 - U3 RINP
U1 GND - U5 VSS
U5 ~RST - U2 ~RESET
U1 IO18 - U3 GAIN/SLV
U2 SDATA_OUT0 - U3 RINP
U1 IO15 - U3 MUTE
U1 IO4 - U4 _CE
U6 VIN - C2 P1
U1 IO18 - U3 GAIN/SLV
U1 GND - U5 VSS
J2 VBUS4 - D1 Anode
U2 XTALOUT - C11 P1
U1 GND - U5 VSS
U1 IO22 - U8 SCL1
J1 1 - U4 SRN
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
U1 GND - U5 VSS
U1 IO19 - U3 SYNC
U1 IO13 - U3 MODSEL
U1 IO2 - U4 _PG
U3 PVCC - C6 P1
U4 SRP - GND GND
U3 AVCC - C7 P1
U1 IO22 - U8 SCL1
U1 IO17 - U3 FAULTZ
U1 IO5 - U4 _INT
U1 IO21 - U8 SDA1
U1 IO16 - U3 SDZ
U1 IO16 - U3 SDZ
U9
C1
Capacitance
Capacitance
C2
Capacitance
Capacitance
U5
U2
L1
Inductance
Inductance
L1
GND
L2
Inductance
Inductance
L2
GND
GND
U3
U8

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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

Pricing & Availability

Distributor

Qty 1

Arrow

$9.44–$13.18

Digi-Key

$9.74–$12.09

LCSC

$16.32–$16.72

Mouser

$13.14–$13.79

TME

$7.61

Verical

$7.14–$12.87

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