# mcu_base ## Description Dual-MCU Board with SWD Level Shifting Between ATSAMD11D14A and nRF54L15 ## Project Details - **Owner:** beckybutton - **Created:** 11/27/2025 - **Last Updated:** 12/2/2025 - **Visibility:** Public - **Domain:** Consumer Electronics - **Connectivity:** Bluetooth - **System Architecture:** ATSAMD11D14A SWD -> Single-bit bidirectional level shifter -> nRF54L15 SWD (SWDIO shifted, SWCLK direct) - **Project Title:** Dual-MCU Board with SWD Level Shifting Between ATSAMD11D14A and nRF54L15 - **Net 3 Role:** Clocks / reference: IC2:PA08 driving IC1:P1.08/CLK16M/EXTREF - **SWD Topology Notes:** SAMD11 (IC2) acts as programmer/debugger over SWD for nRF54 (IC1). SWDIO passes through level shifter, SWCLK is direct, reset and UART (RX/TX) signals also interconnected. - **Secondary Microcontroller:** NRF54L15-CAAA-R7 - **License:** https://creativecommons.org/licenses/by/4.0/ - **Primary Microcontroller:** ATSAMD11D14A-MUT - **Operating Voltage:** 3.3V - **Software:** Bare metal - **Power Requirements:** USB - **Copies:** 2 ## Key Components ### IC1 — [NRF54L15-CAAA-R7](https://www.flux.ai/adrian95/nrf54l15-caaa-r7~cyf.md) - Package or Case Code: NRF54L15CAAAR7 - Part Type: Integrated Circuit - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/6469/NRF54L15-CAAA-R7.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Nordic Semiconductor - Manufacturer Part Number: NRF54L15-CAAA-R7 **Pins:** - ANT [pin D1] - DCC [pin A7] - DECA [pin A4] - DECD [pin A5] - DECRF [pin B1] - NRESET [pin D2] - P0.00 [pin G1] - P0.01 [pin F1] - P0.02 [pin E2] - P0.03/GRTCPWM [pin E1] - P0.04/GRTCLFCLKOUT [pin D3] - P1.00/XL1 [pin C5] - P1.01/XL2 [pin C6] - P1.02/NFC1 [pin C7] - P1.03/NFC2 [pin D5] - P1.04_/ASO_[0]/AIN0 [pin D6] - P1.05/ASI_[0]/RADIO_[6]/AIN1 [pin E6] - P1.06/ASO_[1]/AIN2 [pin D7] - P1.07/ASI_[1]/AIN3 [pin E7] - P1.08/CLK16M/EXTREF [pin F7] - P1.09/ASO[2]/RADIO_[0] [pin B3] - P1.10/ASI_[2]/RADIO_[1] [pin C3] - P1.11/ASO_[3]/RADIO_[2]/AIN4 [pin C4] - P1.12/ASI_[3]_/RADIO_[3]/AIN5 [pin A3] - P1.13/RADIO_[4]/AIN6 [pin B4] - P1.14_/RADIO_[5]/AIN7 [pin B5] - P1.15 [pin B6] - P2.00 [pin G6] - P2.01 [pin G7] - P2.02 [pin F6] - P2.03 [pin E5] - P2.04 [pin F5] - P2.05 [pin G5] - P2.06/TRACECLK [pin F4] - P2.07/TRACEDATA_[0]/SWO [pin E4] - P2.08/TRACEDATA_[1] [pin D4] - P2.09/TRACEDATA_[2] [pin F3] - P2.10/TRACEDATA_[3] [pin G2] - SWDCLK [pin E3] - SWDIO [pin F2] - VDD_1 [pin B7] - VDD_2 [pin G3] - VSS_1 [pin A6] - VSS_2 [pin G4] - VSS_PA [pin C2] - XC1 [pin A1] - XC2 [pin A2] ### IC2 — [ATSAMD11D14A-MUT](https://www.flux.ai/adrian95/atsamd11d14a-mut~mke.md) - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-42363-SAM-D11_Summary.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip Technology - Manufacturer Part Number: ATSAMD11D14A-MUT - Part Type: Microcontroller **Pins:** - EP [pin 25] - GND [pin 23] - PA02 [pin 1] - PA03 [pin 2] - PA04 [pin 3] - PA05 [pin 4] - PA06 [pin 5] - PA07 [pin 6] - PA08 [pin 7] - PA09 [pin 8] - PA10 [pin 9] - PA11 [pin 10] - PA14 [pin 11] - PA15 [pin 12] - PA16 [pin 13] - PA17 [pin 14] - PA22 [pin 15] - PA23 [pin 16] - PA24 [pin 21] - PA25 [pin 22] - PA27 [pin 17] - PA28/~RST [pin 18] - PA30 [pin 19] - PA31 [pin 20] - VDDIO/IN/ANA [pin 24] ### J1 — [ARM JTAG SWD 10Pin 0.05" Connector](https://www.flux.ai/vasy_skral/arm-jtag-swd-10pin-005-connector~y0b.md) - Part Type: Connector - Datasheet URL: https://suddendocs.samtec.com/catalog_english/ftsh_smt.pdf - Manufacturer Part Number: FTSH-105-01-L-DV-007-K - Manufacturer Name: Analog Devices **Pins:** - ~RESET~ [pin 10] - GND [pin 5] - GND [pin 3] - GNDDetect [pin 9] - NC/TDI [pin 8] - SWDCLK/TCK [pin 4] - SWDIO/TMS [pin 2] - SWO/TDO [pin 6] - VTref [pin 1] ### J2 — [QWIIC I2C JST Connector](https://www.flux.ai/vasy_skral/qwiic-i2c-jst-connector~d55.md) - Manufacturer Part Number: SM04B-SRSS-TB - Manufacturer Name: JST Sales America Inc. - Part Type: Connector - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/JST%20PDFs/SR%20Connector.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J3 — [QWIIC I2C JST Connector](https://www.flux.ai/vasy_skral/qwiic-i2c-jst-connector~d55.md) - Manufacturer Part Number: SM04B-SRSS-TB - Manufacturer Name: JST Sales America Inc. - Part Type: Connector - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/JST%20PDFs/SR%20Connector.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J4 — [QWIIC I2C JST Connector](https://www.flux.ai/vasy_skral/qwiic-i2c-jst-connector~d55.md) - Part Type: Connector - Manufacturer Part Number: SM04B-SRSS-TB - Manufacturer Name: JST Sales America Inc. - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/JST%20PDFs/SR%20Connector.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J5 — [QWIIC I2C JST Connector](https://www.flux.ai/vasy_skral/qwiic-i2c-jst-connector~d55.md) - Part Type: Connector - Manufacturer Name: JST Sales America Inc. - Manufacturer Part Number: SM04B-SRSS-TB - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/JST%20PDFs/SR%20Connector.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### Q1 — [LN237N3T5G](https://www.flux.ai/lcsc/ln237n3t5g~mick.md) - Manufacturer Name: LRC(乐山无线电) - LCSC Part Number: C383245 - JLCPCB Part Class: Extended Part - Manufacturer Part Number: LN237N3T5G - Package or Case Code: SOT-883-3_L1.0-W0.6-BR - Part Type: MOSFETs **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### U2 — [TXS0101DBVR](https://www.flux.ai/lcsc/txs0101dbvr~2e8.md) - LCSC Part Number: C132604 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1811081943_Texas-Instruments-TXS0101DBVR_C132604.pdf - JLCPCB Part Class: Extended Part - Part Type: Translators / Level Shifters - Manufacturer Part Number: TXS0101DBVR - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR - Product Info Url: https://lcsc.com/product-detail/Logic-ICs_TI_TXS0101DBVR_TXS0101DBVR_C132604.html - Manufacturer Name: TI(德州仪器) **Pins:** - A [pin 3] - B [pin 4] - GND [pin 2] - OE [pin 5] - VCCA [pin 1] - VCCB [pin 6] ### X1 — [NX2016SA-32MHZ-EXS00A-CS06654](https://www.flux.ai/intellugogroup/nx2016sa-32mhz-exs00a-cs06654~1u.md) - Frequency: 32MHz - Manufacturer Part Number: NX2016SA-32MHZ-EXS00A-CS06654 - Part Type: Oscillator - Package or Case Code: NX2016SA_NDK **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### Y1 — [ABS07-32.768KHZ-T](https://www.flux.ai/adrian95/abs07-32768khz-t~822.md) - Manufacturer Name: Abracon LLC - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Oscillator - Datasheet URL: https://abracon.com/Resonators/ABS07.pdf - Manufacturer Part Number: ABS07-32.768KHZ-T **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/beckybutton/mcubase~ev](https://www.flux.ai/beckybutton/mcubase~ev).* --- *Generated from [https://www.flux.ai/beckybutton/mcubase~ev](https://www.flux.ai/beckybutton/mcubase~ev)*