# sound-mqtt ## Description 1S LiPo USB-C Power Management and 3.3V Regulation Subsystem with SIM800L Modem, TPS61088 5V Boost for MAX98357A Audio and W25Q32 SPI MP3 Storage ## Project Details - **Owner:** adepridho - **Created:** 12/12/2025 - **Last Updated:** 12/24/2025 - **Visibility:** Public - **Operating Voltage:** 3.3V - **Net Type - BAT:** Power - **Net Type - 3V3:** Power - **Domain:** Telecommunications - **Connectivity:** Cellular - **Net Type - SYS:** Power - **ERC/DRC Review:** No issues detected (no duplicate nets, shorts, or unintended connections found after SIM interface wiring) - **Project Name:** sound-mqtt - **System Architecture:** ```mermaid flowchart TD subgraph power_chain [Existing Power Chain] J1_Battery["J1 Battery"] --> Q1["Q1 PFET AO4407A"] Q1 --> SYS["SYS net"] SYS --> U3["U3 TPS62130 Buck"] U3 --> V33["3V3 net"] V33 --> U1["U1 ESP-12F MCU"] J3_USB_C["J3 USB-C"] --> U4["U4 SLM6400 Charger"] U4 --> J1_Battery U4 --> SYS end subgraph audio_path [Audio Playback Path] SYS -->|5V boost| U5["U5 TPS61088 Boost"] U5 --> V5["5V net"] U5_EN["U5 EN"] --> R10["R10 100kΩ Pdwn"] R10 --> U1_GPIO["U1 GPIOx (EN control)"] V5 --> U6["U6 MAX98357A Amp"] U6 -->|BTL+| J2_Speaker["J2 Speaker+"] U6 -->|BTL-| J2_Speaker_N["J2 Speaker-"] end subgraph spi_storage [SPI NOR Storage] V33 --> C_spi["C_spi 100nF"] V33 --> U7["U7 W25Q32 NOR"] U7 -->|MOSI| U1_MOSI["U1 MOSI"] U7 -->|MISO| U1_MISO["U1 MISO"] U7 -->|CLK| U1_SCLK["U1 SCLK"] U7 -->|CS| U1_CS["U1 GPIOy (CS)"] end %% Existing SIM800L branch SYS --> U2["U2 SIM800L"] U2 --> GND["GND"] ``` - **License:** http://solderpad.org/licenses/SHL-2.1/ - **Power Requirements:** USB - **Power Requirements (Secondary):** Battery - **Project Description:** 1S LiPo USB-C power management and 3.3 V buck regulator subsystem with SIM800L cellular modem supply, 5 V boost for audio playback path, and SPI NOR flash for MP3 storage. ## Key Components ### J1 — [Type-C-2.0-6Pin](https://www.flux.ai/jharwinbarrozo/type-c-2p0-6pin~wh.md) - Manufacturer Name: CIKI - Manufacturer Part Number: Type-C-2.0-6Pin - Part Type: Connector - Datasheet URL: https://datasheet.lcsc.com/lcsc/2204071830_CIKI-Type-C-2-0-6Pin_C2987385.pdf **Pins:** - CC1 - CC2 - GND - GND__1 - SHIELD - SHIELD__1 - SHIELD__2 - SHIELD__3 - V-BUS - V-BUS__1 ### U1 — [ESP32-WROOM-32](https://www.flux.ai/vasy_skral/esp32-wroom-32~mxw.md) - Part Type: Integrated Circuit - Manufacturer Part Number: ESP32-WROOM-32 - Manufacturer Name: Espressif Systems - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf **Pins:** - EN [pin 3] - GND [pin 38] - GND [pin 39] - GND [pin 15] - GND [pin 1] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - NC [pin 32] - RXD0/IO3 [pin 34] - SCK/CLK [pin 20] - SCS/CMD [pin 19] - SDI/SD1 [pin 22] - SDO/SD0 [pin 21] - SENSOR_VN [pin 5] - SENSOR_VP [pin 4] - SHD/SD2 [pin 17] - SWP/SD3 [pin 18] - TXD0/IO1 [pin 35] - VDD [pin 2] ### U2 — [TP4056](https://www.flux.ai/vasy_skral/tp4056~xa.md) - Manufacturer Part Number: TP4056 - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: NanJing Top Power ASIC Corp. - Datasheet URL: https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf **Pins:** - ~CHRG [pin 7] - ~STDBY [pin 6] - BAT [pin 5] - CE [pin 8] - EP [pin 9] - GND [pin 3] - PROG [pin 2] - TEMP [pin 1] - VCC [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/adepridho/sound-mqtt~8a](https://www.flux.ai/adepridho/sound-mqtt~8a).* --- *Generated from [https://www.flux.ai/adepridho/sound-mqtt~8a](https://www.flux.ai/adepridho/sound-mqtt~8a)*