# Marine GPS Timing Communicator Stacked ## Description 4-layer marine GPS timing and communication device using nRF52840, u-blox ZED-F9P GNSS with external active antenna via u.FL, 915 MHz LoRa radio, Li-ion battery with USB-C charging, separate clean GNSS LDO and digital 3.3V rail, SPI memory LCD, RGB LEDs, buzzer, and 6-axis IMU. PCB target is a 70 mm circular layout with strict RF zoning, dedicated ground plane, 50 ohm RF traces, physical separation between GNSS and LoRa, and low-noise placement suitable for harsh marine environments. ## Project Details - **Owner:** googs - **Created:** 4/5/2026 - **Last Updated:** 4/5/2026 - **Visibility:** Public ## Key Components ### BZ1 — [PKLCS1212E4001-R1](https://www.flux.ai/lcsc/pklcs1212e4001-r1.md) - Manufacturer Part Number: PKLCS1212E4001-R1 - Product Info Url: https://lcsc.com/product-detail/Buzzers_MuRata_PKLCS1212E4001-R1_Piezo-buzzer-4-0kHz-12-0-12-0-3-0-mm_C113159.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1808132343_Murata-Electronics-PKLCS1212E4001-R1_C113159.pdf - Package or Case Code: BUZ-SMD_2P-L12.0-W12.0-L_PKLCS1212E4001-R1 - Part Type: Buzzers - Role Details: Externally driven piezo buzzer for alarms and status tones - Role: Buzzer - LCSC Part Number: C113159 - Package: SMD Piezo - JLCPCB Part Class: Extended Part - Manufacturer Name: muRata(村田) **Pins:** - - [pin 2] - + [pin 1] ### D13 — [ESD9B5.0ST5G](https://www.flux.ai/kicad-part-library/esd9b5p0st5g.md) - Package: SOD - Role: TVS Protection - Package or Case Code: D_SOD-923 - Role Details: 5V TVS diode protecting the USB-C VBUS input - Datasheet URL: https://www.onsemi.com/pub/Collateral/ESD9B-D.PDF - Manufacturer Name: Texas Instruments Inc. - Part Type: Diode SMD - Manufacturer Part Number: ESD9B5.0ST5G **Pins:** - A1 [pin 1] - A2 [pin 2] ### FPC1 — [61083-044402LF](https://www.flux.ai/lcsc/61083-044402lf.md) - Role Details: 40-pin mezzanine connector on RF board carrying 3V3_GNSS, GND shield pins, GNSS UART/PPS/control, and LoRa SPI/control - Part Type: Mezzanine Connectors (Board to Board) - Package or Case Code: FPC-SMD_40P-P0.80_61083-044402LF - Manufacturer Part Number: 61083-044402LF - Role: RF Board Mezzanine - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410121737_Amphenol-ICC-61083-044402LF_C254698.pdf - LCSC Part Number: C254698 - Package: SMT - JLCPCB Part Class: Extended Part - Manufacturer Name: Amphenol - Product Info Url: https://lcsc.com/product-detail/Others_Amphenol-ICC_61083-044402LF_Amphenol-ICC-61083-044402LF_C254698.html **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] - 21 [pin 21] - 22 [pin 22] - 23 [pin 23] - 24 [pin 24] - 25 [pin 25] - 26 [pin 26] - 27 [pin 27] - 28 [pin 28] - 29 [pin 29] - 3 [pin 3] - 30 [pin 30] - 31 [pin 31] - 32 [pin 32] - 33 [pin 33] - 34 [pin 34] - 35 [pin 35] - 36 [pin 36] - 37 [pin 37] - 38 [pin 38] - 39 [pin 39] - 4 [pin 4] - 40 [pin 40] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### FPC2 — [61083-044402LF](https://www.flux.ai/lcsc/61083-044402lf.md) - Part Type: Mezzanine Connectors (Board to Board) - Package: SMT - Package or Case Code: FPC-SMD_40P-P0.80_61083-044402LF - Manufacturer Part Number: 61083-044402LF - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410121737_Amphenol-ICC-61083-044402LF_C254698.pdf - Role Details: 40-pin mezzanine connector on main board carrying 3V3_GNSS, GND shield pins, GNSS UART/PPS/control, and LoRa SPI/control - JLCPCB Part Class: Extended Part - Role: Main Board Mezzanine - Product Info Url: https://lcsc.com/product-detail/Others_Amphenol-ICC_61083-044402LF_Amphenol-ICC-61083-044402LF_C254698.html - Manufacturer Name: Amphenol - LCSC Part Number: C254698 **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] - 21 [pin 21] - 22 [pin 22] - 23 [pin 23] - 24 [pin 24] - 25 [pin 25] - 26 [pin 26] - 27 [pin 27] - 28 [pin 28] - 29 [pin 29] - 3 [pin 3] - 30 [pin 30] - 31 [pin 31] - 32 [pin 32] - 33 [pin 33] - 34 [pin 34] - 35 [pin 35] - 36 [pin 36] - 37 [pin 37] - 38 [pin 38] - 39 [pin 39] - 4 [pin 4] - 40 [pin 40] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### J1 — [USB-C 2.0 Receptacle](https://www.flux.ai/corynrobinson/usb-c-20-receptacle.md) - Datasheet URL: https://gct.co/files/drawings/usb4105.pdf - Role: USB-C Connector - Purchase Url: https://www.digikey.com/en/products/detail/gct/USB4105-GF-A/11198441 - Manufacturer Part Number: USB4105-GF-A - Manufacturer Name: GTC - Package: USB-C SMT - Part Type: USB C - Role Details: USB-C sink input with CC pull-down configuration and VBUS power entry **Pins:** - CC1 [pin 6] - CC2 [pin 12] - D- [pin 9] - D- [pin 7] - D+ [pin 10] - D+ [pin 8] - GND [pin 15] - GND [pin 1] - GND [pin 16] - GND [pin 2] - SBU1 [pin 11] - SBU2 [pin 5] - VBUS [pin 14] - VBUS [pin 13] - VBUS [pin 4] - VBUS [pin 3] ### J2 — [U.FL-R-SMT-1(01)](https://www.flux.ai/lcsc/upfl-r-smt-101.md) - Manufacturer Name: HRS(广濑) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010203_HRS-Hirose-U-FL-R-SMT-1-01_C598199.pdf - Manufacturer Part Number: U.FL-R-SMT-1(01) - Part Type: RF Connectors / Coaxial Connectors - JLCPCB Part Class: Extended Part - Package: U.FL SMT - Package or Case Code: RF-SMD_U.FL-R-SMT-1-80 - Role Details: 50 ohm GNSS antenna connector for active antenna feed - Product Info Url: https://lcsc.com/product-detail/presales_HRS-Hirose-HRS-U-FL-R-SMT-1-01_C598199.html - LCSC Part Number: C598199 - Role: GNSS RF Connector **Pins:** - GND [pin 1] - GND [pin 3] - SIN [pin 2] ### J3 — [S2B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-k-slfsn.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: JST Sales America Inc. - Role Details: 1S Li-ion battery input connector - Part Type: Connector - Role: Battery Connector - Manufacturer Part Number: S2B-PH-K-S(LF)(SN) - Package: JST-PH-2 - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] ### J4 — [B3B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/b3b-ph-k-slfsn.md) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Role: LED Connector - Role Details: External LED connector carrying 3V3_MAIN, GND, and LED_DATA to an off-board LED ring or LED module - Manufacturer Part Number: B3B-PH-K-S(LF)(SN) - Manufacturer Name: JST Sales America Inc. - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Package: JST-PH-3 **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### U1 — [NRF52840-QIAA-T](https://www.flux.ai/lcsc/nrf52840-qiaa-t.md) - LCSC Part Number: C3007766 - Manufacturer Name: NORDIC - Manufacturer Part Number: NRF52840-QIAA-T - Role: Main MCU - Package or Case Code: AQFN-73_L7.0-W7.0-P0.50-BL-EP4.8 - Role Details: nRF52840 BLE MCU handling GNSS timing control, LoRa communication, UI, and sensors - Part Type: RF Transceiver ICs - Package: AQFN-73 - JLCPCB Part Class: Extended Part **Pins:** - ANT [pin H23] - D- [pin AD4] - D+ [pin B16] - DCC [pin B3] - DCCH [pin AB2] - DEC1 [pin C1] - DEC2 [pin A18] - DEC3 [pin D23] - DEC4 [pin B5] - DEC5 [pin N24] - DEC6 [pin E24] - DECUSB [pin AC5] - EP [pin 0] - P0.00/XL1 [pin D2] - P0.01/XL2 [pin F2] - P0.02/AIN0 [pin A12] - P0.03/AIN1 [pin B13] - P0.04/AIN2 [pin J1] - P0.05/AIN3 [pin K2] - P0.06 [pin L1] - P0.07/TRACECLK [pin M2] - P0.08 [pin N1] - P0.09/NFC1 [pin L24] - P0.10/NFC2 [pin J24] - P0.11 [pin T2] - P0.12/TRACEDATA1 [pin U1] - P0.13 [pin AD8] - P0.14 [pin AC9] - P0.15 [pin B17] - P0.16 [pin AC11] - P0.17 [pin AD12] - P0.18/nRESET [pin AC13] - P0.19 [pin AC15] - P0.20 [pin AD16] - P0.21 [pin D2] - P0.22 [pin AD18] - P0.23 [pin AC19] - P0.24 [pin AD20] - P0.25 [pin AC21] - P0.26 [pin G1] - P0.27 [pin H2] - P0.28/AIN4 [pin B11] - P0.29/AIN5 [pin A10] - P0.30/AIN6 [pin B9] - P0.31/AIN7 [pin A8] - P1.00/TRACEDATA0 [pin AD22] - P1.01 [pin Y23] - P1.02 [pin W24] - P1.03 [pin V23] - P1.04 [pin U24] - P1.05 [pin T23] - P1.06 [pin R24] - P1.07 [pin P23] - P1.08 [pin P2] - P1.09/TRACEDATA3 [pin R1] - P1.10 [pin A20] - P1.11 [pin B19] - P1.12 [pin B17] - P1.13 [pin A16] - P1.14 [pin B15] - P1.15 [pin A14] - SWDCLK [pin AA24] - SWDIO [pin AC24] - VBUS [pin AD2] - VDD [pin AD14] - VDD [pin W1] - VDD [pin A22] - VDD [pin B1] - VDD [pin AD23] - VDDH [pin Y2] - VSS [pin B7] - VSS_PA [pin F23] - XC1 [pin B24] - XC2 [pin A23] ### U2 — [ZED-F9P-01B](https://www.flux.ai/adrian95/zed-f9p-01b.md) - Manufacturer Part Number: ZED-F9P-01B - Role: GNSS Receiver - Manufacturer Name: U-blox - Role Details: u-blox ZED-F9P GNSS timing module with active antenna feed and timing outputs - Datasheet URL: https://content.u-blox.com/sites/default/files/ZED-F9P-04B_DataSheet_UBX-21044850.pdf - Part Type: Module - License: https://creativecommons.org/licenses/by/4.0/ - Package: 54-LGA **Pins:** - ANT_DETECT [pin 4] - ANT_OFF [pin 5] - ANT_SHORT_N [pin 6] - D_SEL [pin 47] - EP_1 [pin 55] - EP_10 [pin 64] - EP_11 [pin 65] - EP_12 [pin 66] - EP_13 [pin 67] - EP_14 [pin 68] - EP_15 [pin 69] - EP_16 [pin 70] - EP_17 [pin 71] - EP_18 [pin 72] - EP_19 [pin 73] - EP_2 [pin 56] - EP_20 [pin 74] - EP_21 [pin 75] - EP_22 [pin 76] - EP_23 [pin 77] - EP_24 [pin 78] - EP_25 [pin 79] - EP_26 [pin 80] - EP_27 [pin 81] - EP_28 [pin 82] - EP_29 [pin 83] - EP_3 [pin 57] - EP_30 [pin 84] - EP_31 [pin 85] - EP_32 [pin 86] - EP_33 [pin 87] - EP_34 [pin 88] - EP_35 [pin 89] - EP_36 [pin 90] - EP_37 [pin 91] - EP_38 [pin 92] - EP_39 [pin 93] - EP_4 [pin 58] - EP_40 [pin 94] - EP_41 [pin 95] - EP_42 [pin 96] - EP_43 [pin 97] - EP_44 [pin 98] - EP_45 [pin 99] - EP_46 [pin 100] - EP_47 [pin 101] - EP_48 [pin 102] - EP_5 [pin 59] - EP_6 [pin 60] - EP_7 [pin 61] - EP_8 [pin 62] - EP_9 [pin 63] - EXTINT [pin 51] - GEOFENCE_STAT [pin 19] - GND_1 [pin 1] - GND_2 [pin 3] - GND_3 [pin 12] - GND_4 [pin 14] - GND_5 [pin 32] - GND_6 [pin 37] - GND_7 [pin 41] - GND_8 [pin 48] - RESERVED_1 [pin 8] - RESERVED_10 [pin 21] - RESERVED_11 [pin 22] - RESERVED_12 [pin 23] - RESERVED_13 [pin 24] - RESERVED_14 [pin 25] - RESERVED_15 [pin 28] - RESERVED_16 [pin 29] - RESERVED_17 [pin 30] - RESERVED_18 [pin 31] - RESERVED_19 [pin 35] - RESERVED_2 [pin 9] - RESERVED_20 [pin 52] - RESERVED_21 [pin 54] - RESERVED_3 [pin 10] - RESERVED_4 [pin 11] - RESERVED_5 [pin 13] - RESERVED_6 [pin 15] - RESERVED_7 [pin 16] - RESERVED_8 [pin 17] - RESERVED_9 [pin 18] - RESET_N [pin 49] - RF_IN [pin 2] - RTK_STAT [pin 20] - RXD_/_SPI_MOSI [pin 43] - RXD2 [pin 26] - SAFEBOOT_N [pin 50] - SCL_/_SPI_CLK [pin 45] - SDA_/_SPI_CS_N [pin 44] - TIMEPULSE [pin 53] - TX_READY [pin 46] - TXD_/_SPI_MISO [pin 42] - TXD2 [pin 27] - USB_DM [pin 39] - USB_DP [pin 40] - V_BCKP [pin 36] - V_USB [pin 38] - VCC_1 [pin 33] - VCC_2 [pin 34] - VCC_RF [pin 7] ### U3 — [SX1262IMLTRT](https://www.flux.ai/kicad-part-library/sx1262imltrt.md) - Role: LoRa Transceiver - Role Details: Sub-GHz LoRa transceiver controlled by SPI with external matching network and antenna feed - Datasheet URL: https://semtech.file.force.com/sfc/dist/version/download/?oid=00DE0000000JelG&ids=0682R00000IjPWSQA3&d=%2Fa%2F2R000000Un7F%2FyT.fKdAr9ZAo3cJLc4F2cBdUsMftpT2vsOICP7NmvMo - Package: QFN-24 - Manufacturer Part Number: SX1262IMLTRT - Package or Case Code: QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm **Pins:** - ~{RESET} [pin 15] - BUSY [pin 14] - DCC_SW [pin 9] - DIO1 [pin 13] - DIO2 [pin 12] - DIO3 [pin 6] - GND [pin 5] - GND [pin 8] - GND [pin 20] - GND [pin 2] - GND [pin 25] - MISO [pin 16] - MOSI [pin 17] - NSS [pin 19] - RFI_N [pin 22] - RFI_P [pin 21] - RFO [pin 23] - SCK [pin 18] - VBAT [pin 10] - VBAT_IO [pin 11] - VDD_IN [pin 1] - VR_PA [pin 24] - VREG [pin 7] - XTA [pin 3] - XTB [pin 4] ### U4 — [LSM6DS3TR-C](https://www.flux.ai/jecstronic/lsm6ds3tr-c.md) - Manufacturer Part Number: LSM6DS3TR-C - Part Type: Sensor - Manufacturer Name: STMicroelectronics - Datasheet URL: https://www.mouser.com/datasheet/2/389/lsm6ds3tr_c-1761429.pdf - Role Details: 6-axis accelerometer and gyroscope connected over I2C - Role: IMU - Package: LGA - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ADO/SA0 [pin 1] - CS [pin 12] - GND_1 [pin 6] - GND_2 [pin 7] - INT1 [pin 4] - INT2 [pin 9] - NC_1 [pin 10] - NC_2 [pin 11] - SCL [pin 13] - SCX [pin 3] - SDA [pin 14] - SDX [pin 2] - VDD [pin 8] - VDDIO [pin 5] ### U5 — [BQ24075TRGTR](https://www.flux.ai/adrian95/bq24075trgtr.md) - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - Package or Case Code: QFN50P300X300X100-17N-D - Package: QFN - Role: Battery Charger - Manufacturer Part Number: BQ24075TRGTR - Role Details: USB-friendly Li-ion charger with power-path management for 1S battery system - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: http://componentsearchengine.com/Datasheets/1/BQ24075TRGTR.pdf **Pins:** - ~CE [pin 4] - ~CHG [pin 9] - ~PGOOD [pin 7] - BAT_1 [pin 2] - BAT_2 [pin 3] - EN1 [pin 6] - EN2 [pin 5] - EP [pin 17] - ILIM [pin 12] - IN [pin 13] - ISET [pin 16] - OUT_1 [pin 10] - OUT_2 [pin 11] - SYSOFF [pin 15] - TMR [pin 14] - TS [pin 1] - VSS [pin 8] ### U6 — [TPS78233DDC](https://www.flux.ai/kicad-part-library/tps78233ddc.md) - Manufacturer Name: Texas Instruments Inc. - Package or Case Code: SOT-23-5 - Manufacturer Part Number: TPS78233DDC - Role Details: Low-noise clean 3.3V regulator dedicated to GNSS and active antenna supply path - Role: GNSS LDO - Package: SOT-23-5 - Datasheet URL: http://www.ti.com/lit/gpn/tps782 **Pins:** - EN [pin 3] - GND [pin 4] - GND [pin 2] - IN [pin 1] - OUT [pin 5] ### U7 — [LMR33620ARNXT](https://www.flux.ai/adrian95/lmr33620arnxt.md) - Part Type: Integrated Circuit - Manufacturer Part Number: LMR33620ARNXT - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Main 3.3V switching regulator feeding MCU, LoRa, LEDs, display, and digital loads - Package: HotRod QFN - Role: Digital Buck - Manufacturer Name: Texas Instruments - Datasheet URL: http://www.ti.com/lit/gpn/lmr33620 - Package or Case Code: LMR33620ARNXT **Pins:** - AGND [pin 6] - BOOT [pin 4] - EN [pin 9] - FB [pin 7] - NC [pin 3] - PG [pin 8] - PGND_1 [pin 1] - PGND_2 [pin 11] - SW [pin 12] - VCC [pin 5] - VIN_1 [pin 2] - VIN_2 [pin 10] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/googs/marine-gps-timing-communicator-stacked](https://www.flux.ai/googs/marine-gps-timing-communicator-stacked).* --- *Generated from [https://www.flux.ai/googs/marine-gps-timing-communicator-stacked](https://www.flux.ai/googs/marine-gps-timing-communicator-stacked)*