# Smart Glasses PCB ## Description Smart Glasses BLE Audio & RF PCB with Nordic nRF54L15 MCU and 3‑Pad RF Pi‑Match Network for Johanson 2450AT18B100E Chip Antenna (4‑Layer Microstrip, Antenna Keepout, Impedance‑Controlled RF Path) ## Project Details - **Owner:** owloliu7 - **Created:** 1/29/2026 - **Last Updated:** 1/29/2026 - **Visibility:** Public - **Keepout Zones:** Antenna keepout on RF end of board; reserve a 5 mm clearance region around ANT1 and along the adjacent board edge for the Johanson 2450AT18B100E chip antenna, with no copper, planes, or components in that area on any layer. - **License:** http://solderpad.org/licenses/SHL-2.1/ - **Operating Voltage:** 3.3V - **System Architecture:** flowchart TD MCU["nRF54L15 MCU"] PWR["Power Subsystem"] CLK["Clock Circuits"] RF["RF Path"] AUD["Audio Interfaces"] BUS["Digital Buses"] DBG["Debug Header"] PWR --> MCU CLK --> MCU MCU --> RF MCU --> AUD MCU --> BUS MCU --> DBG - **Stackup:** Standard 4 Layer - **Software:** Bare metal - **Antenna Keepout Margin:** 5mm - **Manufacturing Quantity Target:** 100 - **Schematic Status:** Ready for PCB Layout - **Domain:** Consumer Electronics - **Board Outline Dimensions:** 13 mm x 13 mm - **Power Requirements:** Battery - **Pi-Match Footprint Extents:** 3.0 mm x 3.0 mm - **RF Layout Prepared:** Yes - **Connectivity:** Bluetooth - **Copies:** 1 ## Key Components ### ANT1 — [NRF54L15-QFAA-R](https://www.flux.ai/adrian95/nrf54l15-qfaa-r.md) - Role: Main MCU - Datasheet URL: https://docs-be.nordicsemi.com/bundle/ps_nrf54L15/page/pdf/nRF54L15_nRF54L10_nRF54L05_Datasheet_v0.8.pdf - Manufacturer Part Number: NRF54L15-QFAA-R - Manufacturer Name: Nordic Semiconductor ASA - Part Type: Integrated Circuit - Package or Case Code: QFN40P600X600X95-49N - Package: QFN40P600X600X95-49N - Role Details: Nordic nRF54L15 BLE microcontroller **Pins:** - ANT [pin 31] - DCC [pin 46] - DECA [pin 43] - DECD [pin 45] - DECRF [pin 33] - EP [pin 49] - NRESET [pin 30] - P0.00 [pin 23] - P0.01 [pin 24] - P0.02 [pin 27] - P0.03/GRTC_PWMOUT [pin 28] - P0.04/GRTC_CLKOUT32K [pin 29] - P1.00/XL1 [pin 1] - P1.01/XL2 [pin 2] - P1.02/NFC1 [pin 3] - P1.03/NFC2 [pin 4] - P1.04/AIN0/TAMPC [pin 5] - P1.05/AIN1/TAMPC [pin 6] - P1.06/AIN2/TAMPC [pin 7] - P1.07/AIN3/TAMPC [pin 8] - P1.08/CLK16M/TAMPC [pin 9] - P1.09/TAMPC [pin 37] - P1.10/TAMPC [pin 38] - P1.11/AIN4 [pin 39] - P1.12/AIN5 [pin 40] - P1.13/AIN6 [pin 41] - P1.14/AIN7 [pin 42] - P2.00/SPI.DCX [pin 11] - P2.01/SPI.SCK [pin 12] - P2.02/SPI.SDI/SDO [pin 13] - P2.03 [pin 14] - P2.04/SPI.SDI/SDO [pin 15] - P2.05/SPI.CS [pin 16] - P2.06/TRACECLK/SPI.SCK [pin 17] - P2.07/TRACEDATA[0]/SWO/SPI.DCX [pin 18] - P2.08/TRACEDATA[1]/SPI.SDI/SDO [pin 19] - P2.09/TRACEDATA[2]/SPI.SDI/SDO [pin 20] - P2.10/TRACEDATA[3]/SPIM.CS [pin 21] - SWDCLK [pin 26] - SWDIO [pin 25] - VDD_1 [pin 10] - VDD_2 [pin 22] - VDD_3 [pin 36] - VDD_4 [pin 47] - VDD_5 [pin 48] - VSS [pin 44] - VSS_PA [pin 32] - XC1 [pin 34] - XC2 [pin 35] ### ANT1 — [2450AT18B100E](https://www.flux.ai/lcsc/2450at18b100e.md) - Package or Case Code: ANT-SMD_L3.2-W1.6 - Manufacturer Name: JOHANSON(约翰逊) - JLCPCB Part Class: Extended Part - LCSC Part Number: C2917717 - Manufacturer Part Number: 2450AT18B100E - Part Type: Pre-ordered Products - Role: RF Tuning / Matching - Role Details: 2.45GHz chip antenna **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [Pin Header 02x05 1.27mm Vertical SMD](https://www.flux.ai/adrian95/pin-header-02x05-127mm-vertical-smd.md) - Role Details: SWD debug header for SWDIO and SWCLK - Part Type: Connector **Pins:** - Pin_1 - Pin_10 - Pin_2 - Pin_3 - Pin_4 - Pin_5 - Pin_6 - Pin_7 - Pin_8 - Pin_9 ### J2 — [B2B-PH-K-S(LF)(SN)](https://www.flux.ai/jecstronic/b2b-ph-k-slfsn.md) - Role Details: Battery input connector for 3.7V Li-ion battery - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811151524_JST-Sales-America-B2B-PH-K-S-LF-SN_C131337.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Part Number: B2B-PH-K-S(LF)(SN) - Manufacturer Name: JST Sales America **Pins:** - PIN1 [pin 1] - PIN2 [pin 2] ### MK1 — [IM69D130V01XTSA1](https://www.flux.ai/vasy_skral/im69d130v01xtsa1.md) - Role Details: PDM MEMS digital microphone for stereo audio channels - Part Type: Integrated Circuit - Manufacturer Name: Infineon Technologies - Manufacturer Part Number: IM69D130V01XTSA1 - Datasheet URL: https://www.infineon.com/dgdl/Infineon-IM69D130-DS-v01_00-EN.pdf?fileId=5546d462602a9dc801607a0e46511a2e **Pins:** - CLOCK [pin 3] - DATA [pin 1] - GND [pin 5] - SELECT [pin 4] - VDD [pin 2] ### MK2 — [IM69D130V01XTSA1](https://www.flux.ai/vasy_skral/im69d130v01xtsa1.md) - Manufacturer Part Number: IM69D130V01XTSA1 - Datasheet URL: https://www.infineon.com/dgdl/Infineon-IM69D130-DS-v01_00-EN.pdf?fileId=5546d462602a9dc801607a0e46511a2e - Manufacturer Name: Infineon Technologies - Role Details: PDM MEMS digital microphone for stereo audio channels - Part Type: Integrated Circuit **Pins:** - CLOCK [pin 3] - DATA [pin 1] - GND [pin 5] - SELECT [pin 4] - VDD [pin 2] ### U2 — [TLV75533PDBVR](https://www.flux.ai/lcsc/tlv75533pdbvr.md) - Package or Case Code: SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR - LCSC Part Number: C404027 - Package: SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR - Role Details: 3.3 V LDO regulator for MCU power rail - Product Info Url: https://lcsc.com/product-detail/Low-Dropout-Regulators-LDO_Texas-Instruments-TI-TLV75533PDBVR_C404027.html - Manufacturer Name: TI(德州仪器) - Role: Power Conversion - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1912111437_Texas-Instruments-TLV75533PDBVR_C404027.pdf - JLCPCB Part Class: Extended Part - Part Type: Linear Voltage Regulators (LDO) - Manufacturer Part Number: TLV75533PDBVR **Pins:** - EN [pin 3] - GND [pin 2] - IN [pin 1] - NC [pin 4] - OUT [pin 5] ### Y1 — [NX3225SA-32.000MHZ-STD-CSR-1](https://www.flux.ai/adrian95/nx3225sa-32p000mhz-std-csr-1.md) - Role Details: 32 MHz crystal oscillator for nRF54L15 high-frequency clock - Package or Case Code: NX3225SA32000MHZSTDCSR1 - Datasheet URL: https://www.mouser.com/datasheet/2/905/ndk_04232018_NX3225SA_STD_CSR_1-1324926.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: NX3225SA-32.000MHZ-STD-CSR-1 - Manufacturer Name: NDK (NIHON DEMPA KOGYO CO., LTD) - Part Type: Oscillator - Role: Timing **Pins:** - GND_1 [pin 2] - GND_2 [pin 4] - XTAL_1 [pin 1] - XTAL_2 [pin 3] ### Y2 — [ABS07-32.768KHZ-T](https://www.flux.ai/adrian95/abs07-32768khz-t.md) - Manufacturer Name: Abracon LLC - License: https://creativecommons.org/licenses/by/4.0/ - Role: Timing - Role Details: 32.768 kHz watch crystal for nRF54L15 low-frequency clock - Part Type: Oscillator - Manufacturer Part Number: ABS07-32.768KHZ-T - Datasheet URL: https://abracon.com/Resonators/ABS07.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/owloliu7/smart-glasses-pcb](https://www.flux.ai/owloliu7/smart-glasses-pcb).* --- *Generated from [https://www.flux.ai/owloliu7/smart-glasses-pcb](https://www.flux.ai/owloliu7/smart-glasses-pcb)*