# smart-speaker-project ## Description Radxa Zero 100mm Circular Audio Board: 4-Channel Mic Array & 3W Class-D Amplifier with USB-C Power ## Project Details - **Owner:** eifa - **Created:** 10/13/2025 - **Last Updated:** 10/13/2025 - **Visibility:** Public - **Stackup:** Standard 4 Layer with internal power planes - **stackup:** Standard 4 Layer with internal power planes - **System Architecture:** flowchart LR USB_C[USB-C Input] --> Power_Rails[Power Rails] Power_Rails --> ADAU7118[ADAU7118] ADAU7118 --> Mic_Array[Microphone Array] Power_Rails --> MAX98357A[MAX98357A] MAX98357A --> Speaker_Output[Speaker Output] Power_Rails --> GPIO_Header[2×20 GPIO Header] - **Forks:** 1 ## Key Components ### Cbulk — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Role: Bulk - Voltage Rating: 10V - Dielectric Type: X5R - Capacitance: 10uF - Role Details: Bulk capacitor for MAX98357A - Substitute Manufacturer Part Number: GRM21BR61A106KE20L - Package: SMD_0603_1608Metric - Part Type: Ceramic Capacitor - Footprint: C_0805_2012Metric - Manufacturer Part Number: GRM21BR61A106KE19L - Manufacturer Name: Murata **Pins:** - P1 [pin 1] - P2 [pin 2] ### Cmic1_0p1 — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Capacitance: 0.1uF - Voltage Rating: 6.3V - Substitute Manufacturer Part Number: GRM188R71C104KA01D - Role: Decoupling - Footprint: C_0603_1608Metric - Part Type: Ceramic Capacitor - Manufacturer Name: Murata - Dielectric Type: X7R - Manufacturer Part Number: GRM188R71E104KA12D - Package: SMD_0603_1608Metric - Role Details: Mic1 Vdd decoupling **Pins:** - P1 [pin 1] - P2 [pin 2] ### Cmic1_1u — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Voltage Rating: 6.3V - Package: SMD_0603_1608Metric - Role Details: Mic1 Vdd bulk decoupling - Part Type: Ceramic Capacitor - Footprint: C_0603_1608Metric - Substitute Manufacturer Part Number: GRM188R61A105KA12D - Manufacturer Name: Murata - Manufacturer Part Number: GRM188R61D105KE20L - Dielectric Type: X5R - Capacitance: 1uF - Role: Bulk **Pins:** - P1 [pin 1] - P2 [pin 2] ### Cmic2_0p1 — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Role: Decoupling - Package: SMD_0603_1608Metric - Part Type: Ceramic Capacitor - Manufacturer Name: Murata - Manufacturer Part Number: GRM188R71E104KA12D - Substitute Manufacturer Part Number: GRM188R71C104KA01D - Role Details: Mic2 Vdd decoupling - Footprint: C_0603_1608Metric - Dielectric Type: X7R - Voltage Rating: 6.3V - Capacitance: 0.1uF **Pins:** - P1 [pin 1] - P2 [pin 2] ### Cmic2_1u — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Role: Bulk - Capacitance: 1uF - Footprint: C_0603_1608Metric - Role Details: Mic2 Vdd bulk decoupling - Package: SMD_0603_1608Metric - Manufacturer Part Number: GRM188R61D105KE20L - Voltage Rating: 6.3V - Manufacturer Name: Murata - Dielectric Type: X5R - Part Type: Ceramic Capacitor - Substitute Manufacturer Part Number: GRM188R61A105KA12D **Pins:** - P1 [pin 1] - P2 [pin 2] ### Cmic3_0p1 — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Footprint: C_0603_1608Metric - Package: SMD_0603_1608Metric - Role: Decoupling - Role Details: Mic3 Vdd decoupling - Substitute Manufacturer Part Number: GRM188R71C104KA01D - Manufacturer Part Number: GRM188R71E104KA12D - Dielectric Type: X7R - Manufacturer Name: Murata - Part Type: Ceramic Capacitor - Voltage Rating: 6.3V - Capacitance: 0.1uF **Pins:** - P1 [pin 1] - P2 [pin 2] ### Cmic3_1u — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Role Details: Mic3 Vdd bulk decoupling - Package: SMD_0603_1608Metric - Manufacturer Part Number: GRM188R61D105KE20L - Substitute Manufacturer Part Number: GRM188R61A105KA12D - Manufacturer Name: Murata - Part Type: Ceramic Capacitor - Dielectric Type: X5R - Footprint: C_0603_1608Metric - Role: Bulk - Capacitance: 1uF - Voltage Rating: 6.3V **Pins:** - P1 [pin 1] - P2 [pin 2] ### Cmic4_0p1 — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Role: Decoupling - Dielectric Type: X7R - Capacitance: 0.1uF - Voltage Rating: 6.3V - Role Details: Mic4 Vdd decoupling - Package: SMD_0603_1608Metric - Substitute Manufacturer Part Number: GRM188R71C104KA01D - Manufacturer Name: Murata - Manufacturer Part Number: GRM188R71E104KA12D - Footprint: C_0603_1608Metric - Part Type: Ceramic Capacitor **Pins:** - P1 [pin 1] - P2 [pin 2] ### Cmic4_1u — [Generic Capacitor](https://www.flux.ai/jharwinbarrozo/generic-capacitor.md) - Package: SMD_0603_1608Metric - Role: Bulk - Footprint: C_0603_1608Metric - Manufacturer Name: Murata - Substitute Manufacturer Part Number: GRM188R61A105KA12D - Manufacturer Part Number: GRM188R61D105KE20L - Part Type: Ceramic Capacitor - Capacitance: 1uF - Voltage Rating: 6.3V - Role Details: Mic4 Vdd bulk decoupling - Dielectric Type: X5R **Pins:** - P1 [pin 1] - P2 [pin 2] ### D1 — [TPD4E05U06DQAR](https://www.flux.ai/lcsc/tpd4e05u06dqar.md) - Manufacturer Name: Leiditech(雷卯电子) - Part Type: ESD Protection Devices - Manufacturer Part Number: TPD4E05U06DQAR - Package or Case Code: DFN2510-10_L2.5-W1.0-P0.50-BL - Reverse Voltage: 5.5V - Power: 40W - Operating Temperature: -40℃~+125℃@(Ta) - JLCPCB Part Class: Extended Part - LCSC Part Number: C2972498 - Breakdown Voltage: 6V **Pins:** - D1- [pin 2] - D1+ [pin 1] - D2- [pin 5] - D2+ [pin 4] - GND [pin 3] - GND [pin 8] - NC [pin 9] - NC [pin 10] - NC [pin 7] - NC [pin 6] ### D1 — [WE-TVS-82400102](https://www.flux.ai/kicad-part-library/we-tvs-82400102.md) - Package or Case Code: SOT-23-6 - Role: Protection - Datasheet URL: https://www.we-online.com/components/products/datasheet/82400102.pdf - Manufacturer Part Number: WE-TVS-82400102 - Manufacturer Name: Texas Instruments Inc. - Role Details: Low-capacitance USB ESD protection diode pair for D+/D- **Pins:** - ~ [pin 1] - ~ [pin 3] - ~ [pin 4] - ~ [pin 5] - ~ [pin 6] - ~ [pin 2] ### F1 — [MF-PSMF050X-2](https://www.flux.ai/adrian95/mf-psmf050x-2.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Fuse - Manufacturer Part Number: MF-PSMF050X-2 - Datasheet URL: https://www.bourns.com/docs/Product-Datasheets/mfpsmf.pdf - Role: Protection - Manufacturer Name: Bourns Inc. - Role Details: Resettable overcurrent protection on USB 5 V input **Pins:** - P1 [pin 1] - P2 [pin 2] ### FB1 — [BLM21PG600SN1D](https://www.flux.ai/adrian95/blm21pg600sn1d.md) - Datasheet URL: https://www.murata.com/en-us/products/en-us/products/productdata/8796738977822/ENFA0005.pdf - Manufacturer Part Number: BLM21PG600SN1D - Manufacturer Name: Murata Electronics - Part Type: Ferrite Bead - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB1 — [BLM18AG121SN1D](https://www.flux.ai/jecstronic/blm18ag121sn1d.md) - Part Type: Filter - Manufacturer Name: Murata Electronics - Manufacturer Part Number: BLM18AG121SN1D - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.murata.com/en-us/products/productdata/8796738650142/ENFA0003.pdf - Role: Choke (EMI Filter) - Role Details: Ferrite bead on speaker output lines (120 Ω @ 100 MHz) **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB2 — [BLM18AG121SN1D](https://www.flux.ai/jecstronic/blm18ag121sn1d.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.murata.com/en-us/products/productdata/8796738650142/ENFA0003.pdf - Manufacturer Name: Murata Electronics - Manufacturer Part Number: BLM18AG121SN1D - Part Type: Filter - Role: Choke (EMI Filter) - Role Details: Ferrite bead on speaker output lines (120 Ω @ 100 MHz) **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB2 — [BLM21PG600SN1D](https://www.flux.ai/adrian95/blm21pg600sn1d.md) - Manufacturer Name: Murata Electronics - Part Type: Ferrite Bead - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.murata.com/en-us/products/en-us/products/productdata/8796738977822/ENFA0005.pdf - Manufacturer Part Number: BLM21PG600SN1D **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB3 — [BLM21PG600SN1D](https://www.flux.ai/adrian95/blm21pg600sn1d.md) - Part Type: Ferrite Bead - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Murata Electronics - Manufacturer Part Number: BLM21PG600SN1D - Datasheet URL: https://www.murata.com/en-us/products/en-us/products/productdata/8796738977822/ENFA0005.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### FB3 — [Generic Inductor](https://www.flux.ai/jharwinbarrozo/generic-inductor.md) - Part Type: Inductor - Package: SMD_0603_1608Metric - Role: Choke (EMI Filter) - Role Details: π-filter inductors for 5 V input **Pins:** - P1 [pin 1] - P2 [pin 2] ### FB4 — [Generic Inductor](https://www.flux.ai/jharwinbarrozo/generic-inductor.md) - Role: Choke (EMI Filter) - Package: SMD_0603_1608Metric - Role Details: π-filter inductors for 5 V input - Part Type: Inductor **Pins:** - P1 [pin 1] - P2 [pin 2] ### FB4 — [BLM21PG600SN1D](https://www.flux.ai/adrian95/blm21pg600sn1d.md) - Part Type: Ferrite Bead - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Murata Electronics - Datasheet URL: https://www.murata.com/en-us/products/en-us/products/productdata/8796738977822/ENFA0005.pdf - Manufacturer Part Number: BLM21PG600SN1D **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [2024100002](https://www.flux.ai/adrian95/2024100002.md) - Part Type: Connector - Manufacturer Part Number: 2024100002 - Role Details: USB-C power input receptacle - Manufacturer Name: Molex - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/834/202410002_Pkg_Spec.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DA- [pin A7] - DA+ [pin A6] - DB- [pin B7] - DB+ [pin B6] - GND1 [pin A1] - GND2 [pin A12] - GND3 [pin B1] - GND4 [pin B12] - RX1- [pin B10] - RX1+ [pin B11] - RX2- [pin A10] - RX2+ [pin A11] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD1 [pin SH1] - SHIELD2 [pin SH2] - SHIELD3 [pin SH3] - SHIELD4 [pin SH4] - TX1- [pin A3] - TX1+ [pin A2] - TX2- [pin B3] - TX2+ [pin B2] - VBUS1 [pin A4] - VBUS2 [pin A9] - VBUS3 [pin B4] - VBUS4 [pin B9] ### J2 — [B2B-PH-K-S(LF)(SN)](https://www.flux.ai/lcsc/b2b-ph-k-slfsn.md) - Connector Gender: Male - Part Type: Wire To Board / Wire To Wire Connector - Product Info Url: https://lcsc.com/product-detail/PH-Connectors_JST_B2B-PH-K-S-LF-SN_B2B-PH-K-S-LF-SN_C131337.html - JLCPCB Part Class: Extended Part - LCSC Part Number: C131337 - Connector Rows: 1 - Connector Pitch: 2mm - Manufacturer Part Number: B2B-PH-K-S(LF)(SN) - Manufacturer Name: JST - Connector Type: Wire To Board Connector - Package or Case Code: CONN-TH_B2B-PH-K-S - Connector Positions: 2 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B2B-PH-K-S-LF-SN_C131337.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [Pin Header 02x01 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-02x01-254mm-vertical.md) - Role Details: Speaker output header - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J3 — [HW-20-20-T-S-780-SM](https://www.flux.ai/adrian95/hw-20-20-t-s-780-sm.md) - Role Details: 2×20 stacking GPIO header - Package or Case Code: HW2020TS780SM - Manufacturer Name: Samtec Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Part Number: HW-20-20-T-S-780-SM - Datasheet URL: https://suddendocs.samtec.com/prints/hw-xx-xx-xx-x-xxxx-sm-x-xxx-xx-mkt.pdf?_gl=1*1qdrl8u*_gcl_aw*R0NMLjE3NTgyNjg2MDMuQ2p3S0NBandpWV9HQmhCRUVpd0FGYWdodmc0a29pYi1lX2VJWWhLakxWY0xzM3JOV2RaeDJVRUt6d29zZkRRcmYzOElhVEFBYUw2Y0dCb0NTZndRQXZEX0J3RQ..*_gcl_au*MTA2 **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 2 [pin 2] - 20 [pin 20] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### MIC1 — [MP34DT06JTR](https://www.flux.ai/lcsc/mp34dt06jtr.md) - Product Info Url: https://lcsc.com/product-detail/Electret-Condenser-Microphone_STMicroelectronics-MP34DT06JTR_C503097.html - Part Type: MEMS Microphones - Manufacturer Name: ST(意法半导体) - LCSC Part Number: C503097 - Package or Case Code: MIC-SMD_5P-L3.0-W4.0-P0.85-BL - JLCPCB Part Class: Extended Part - Role: Sensor - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2004071606_STMicroelectronics-MP34DT06JTR_C503097.pdf - Manufacturer Part Number: MP34DT06JTR - Role Details: PDM MEMS microphone **Pins:** - CLK [pin 3] - DOUT [pin 4] - GND [pin 5] - LR [pin 2] - Vdd [pin 1] ### MIC2 — [MP34DT06JTR](https://www.flux.ai/lcsc/mp34dt06jtr.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2004071606_STMicroelectronics-MP34DT06JTR_C503097.pdf - Manufacturer Part Number: MP34DT06JTR - Role: Sensor - Product Info Url: https://lcsc.com/product-detail/Electret-Condenser-Microphone_STMicroelectronics-MP34DT06JTR_C503097.html - Part Type: MEMS Microphones - Manufacturer Name: ST(意法半导体) - LCSC Part Number: C503097 - Package or Case Code: MIC-SMD_5P-L3.0-W4.0-P0.85-BL - Role Details: PDM MEMS microphone - JLCPCB Part Class: Extended Part **Pins:** - CLK [pin 3] - DOUT [pin 4] - GND [pin 5] - LR [pin 2] - Vdd [pin 1] ### MIC3 — [MP34DT06JTR](https://www.flux.ai/lcsc/mp34dt06jtr.md) - Manufacturer Name: ST(意法半导体) - Part Type: MEMS Microphones - LCSC Part Number: C503097 - Product Info Url: https://lcsc.com/product-detail/Electret-Condenser-Microphone_STMicroelectronics-MP34DT06JTR_C503097.html - JLCPCB Part Class: Extended Part - Package or Case Code: MIC-SMD_5P-L3.0-W4.0-P0.85-BL - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2004071606_STMicroelectronics-MP34DT06JTR_C503097.pdf - Manufacturer Part Number: MP34DT06JTR - Role Details: PDM MEMS microphone - Role: Sensor **Pins:** - CLK [pin 3] - DOUT [pin 4] - GND [pin 5] - LR [pin 2] - Vdd [pin 1] ### MIC4 — [MP34DT06JTR](https://www.flux.ai/lcsc/mp34dt06jtr.md) - Manufacturer Part Number: MP34DT06JTR - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2004071606_STMicroelectronics-MP34DT06JTR_C503097.pdf - Role Details: PDM MEMS microphone - Package or Case Code: MIC-SMD_5P-L3.0-W4.0-P0.85-BL - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Electret-Condenser-Microphone_STMicroelectronics-MP34DT06JTR_C503097.html - LCSC Part Number: C503097 - Role: Sensor - Part Type: MEMS Microphones - Manufacturer Name: ST(意法半导体) **Pins:** - CLK [pin 3] - DOUT [pin 4] - GND [pin 5] - LR [pin 2] - Vdd [pin 1] ### U1 — [ADAU7118ACPZRL](https://www.flux.ai/lcsc/adau7118acpzrl.md) - Package or Case Code: LFCSP-16_L3.0-W3.0-P0.50-BL-EP1.7 - Manufacturer Name: ADI(亚德诺) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2009091234_Analog-Devices-ADAU7118ACPZRL_C654437.pdf - LCSC Part Number: C654437 - JLCPCB Part Class: Extended Part - Manufacturer Part Number: ADAU7118ACPZRL - Role Details: Audio ADC for PDM capture - Product Info Url: https://lcsc.com/product-detail/Pre-ordered-Products_Analog-Devices_ADAU7118ACPZRL_Analog-Devices-ADI-LINEAR-ADAU7118ACPZRL_C654437.html - Role: Integrated Circuit - Part Type: Analog To Digital Converters (ADCs) **Pins:** - ADDR/CONFIG [pin 12] - BCLK [pin 10] - DVDD [pin 14] - EN [pin 13] - EP [pin 17] - FSYNC [pin 9] - GND [pin 15] - IOVDD [pin 16] - PDM_CLK0 [pin 1] - PDM_CLK1 [pin 4] - PDM_DAT0 [pin 2] - PDM_DAT1 [pin 3] - PDM_DAT2 [pin 5] - PDM_DAT3 [pin 6] - SCL [pin 7] - SDA [pin 8] - SDATA [pin 11] ### U2 — [MAX98357AETE+T](https://www.flux.ai/adrian95/max98357aeteplust.md) - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/max98357a-max98357b.pdf - Manufacturer Name: Analog Devices Inc./Maxim Integrated - Role: Integrated Circuit - Manufacturer Part Number: MAX98357AETE+T - Part Type: Integrated Circuit - Role Details: Class-D audio amplifier for speaker playback - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~SD_MODE [pin 4] - BCLK [pin 16] - DIN [pin 1] - GAIN_SLOT [pin 2] - GND_1 [pin 3] - GND_2 [pin 11] - GND_3 [pin 15] - LRCLK [pin 14] - N.C._1 [pin 5] - N.C._2 [pin 6] - N.C._3 [pin 12] - N.C._4 [pin 13] - OUTN [pin 10] - OUTP [pin 9] - THERMAL_PAD [pin 17] - VDD_1 [pin 7] - VDD_2 [pin 8] ### U3 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1.md) - Manufacturer Name: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Datasheet URL: Diodes Incorporated - Role: Linear Regulator - Role Details: 3.3 V LDO for audio supply - Part Type: Integrated Circuit - Manufacturer Part Number: AP2112K-3.3TRG1 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### U4 — [TLV70018DCKR](https://www.flux.ai/lcsc/tlv70018dckr.md) - Product Info Url: https://lcsc.com/product-detail/Low-Dropout-Regulators-LDO_TI_TLV70018DCKR_TLV70018DCKR_C133796.html - Role Details: 1.8 V LDO for core supply - Manufacturer Name: TI(德州仪器) - Role: Linear Regulator - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1806022223_Texas-Instruments-TLV70018DCKR_C133796.pdf - LCSC Part Number: C133796 - Package or Case Code: SC-70-5_L2.1-W1.3-P0.65-LS2.1-BR - JLCPCB Part Class: Extended Part - Manufacturer Part Number: TLV70018DCKR - Part Type: Linear Voltage Regulators (LDO) **Pins:** - EN [pin 3] - GND [pin 2] - IN [pin 1] - N/C [pin 4] - OUT [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/eifa/smart-speaker-project](https://www.flux.ai/eifa/smart-speaker-project).* --- *Generated from [https://www.flux.ai/eifa/smart-speaker-project](https://www.flux.ai/eifa/smart-speaker-project)*