# GLECS Logic Board ## Description Power-section schematic for a 12V DC input generating +4V for a 4G module, +5V, and +3V3 rails with input TVS protection and regulator thermal notes. ## Project Details - **Owner:** ddsdasxdas - **Created:** 7/11/2026 - **Last Updated:** 7/16/2026 - **Visibility:** Public ## Key Components ### D_CLAMP_V — [BAT54H,115](https://www.flux.ai/jecstronic/bat54hc115~nbk.md) - Role: Clamping - Manufacturer Name: Nexperia USA Inc. - Role Details: Schottky over-voltage clamp: anode to V_SENSE, cathode to +3V3 - Datasheet URL: https://assets.nexperia.com/documents/data-sheet/BAT54H.pdf - Part Type: Diode - Manufacturer Part Number: BAT54H,115 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### D_STATUS — [KT-0603R](https://www.flux.ai/adrian95/kt-0603r~7c.md) - Datasheet URL: https://www.lcsc.com/datasheet/lcsc_datasheet_1810231112_Hubei-KENTO-Elec-KT-0603R_C2286.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Role: Signal Generation - Role Details: Red status LED driven from PC13 through R_STATUS - Manufacturer Name: Hubei KENTO Elec - Manufacturer Part Number: KT-0603R **Pins:** - A [pin 2] - K [pin 1] ### D_TVS — [P6SMB33CA](https://www.flux.ai/lcsc/p6smb33ca~2evp.md) - Manufacturer Name: FMS(美丽微) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409280130_FMS-Formosa-Microsemi-P6SMB33CA_C188304.pdf - Role Details: P6SMB33CA bidirectional TVS from +12V to GND - Part Type: TVS - JLCPCB Part Class: Extended Part - Role: Protection - Package or Case Code: SMB_L4.6-W3.6-LS5.3-BI - LCSC Part Number: C188304 - Product Info Url: https://lcsc.com/product-detail/TVS_P6SMB33CA_C188304.html - Manufacturer Part Number: P6SMB33CA **Pins:** - A [pin 2] - K [pin 1] ### FB_VDDA — [GZ1608D601TF](https://www.flux.ai/adrian95/gz1608d601tf~3gg.md) - Manufacturer Name: Shenzhen Sunlord Electronics Co., Ltd. - Manufacturer Part Number: GZ1608D601TF - Datasheet URL: https://www.sunlordinc.com//uploads/files/20230829/GZ%20series%20of%20Multilayer%20Chip%20Ferrite%20Bead.pdf - Role Details: Ferrite bead feeding STM32 VDDA from +3V3 - Role: Choke (EMI Filter) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Ferrite Bead **Pins:** - 1 [pin 1] - 2 [pin 2] ### J_ANT — [U.FL-R-SMT(01)](https://www.flux.ai/lcsc/upfl-r-smt01~zsby.md) - Product Info Url: https://lcsc.com/product-detail/RF-Connectors-Coaxial-Connectors_Hirose-HRS-U-FL-R-SMT-01_C434812.html - Manufacturer Part Number: U.FL-R-SMT(01) - Role Details: U.FL coax connector for LTE main antenna - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_HRS-Hirose-U-FL-R-SMT-01_C434812.pdf - Package or Case Code: ANT-SMD_UFL-R-SMT01 - Part Type: RF Connectors / Coaxial Connectors - Role: RF Connector - LCSC Part Number: C434812 - Manufacturer Name: HRS(广濑) - JLCPCB Part Class: Extended Part **Pins:** - CONT [pin 2] - GND [pin 1] - GND [pin 3] ### J_LINK — [B12B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b12b-xh-alfsn~jih5.md) - Connector Type: JST-XH - Manufacturer Part Number: B12B-XH-A(LF)(SN) - Connector Positions: 12 - Role: Board-to-board connector - Connector Rows: 1 - JLCPCB Part Class: Extended Part - Package or Case Code: CONN-TH_B12B-XH-A-LF-SN - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B12B-XH-A-LF-SN_C158027.pdf - Role Details: Carries power, relay controls, and sensor outputs between HV board and logic board - Part Type: Wire To Board / Wire To Wire Connector - Manufacturer Name: JST - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST_B12B-XH-A-LF-SN_XHsocket-1-12P-pitch2-5mm_C158027.html - Connector Pitch: 2.5mm - LCSC Part Number: C158027 **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### J_SIM — [78646-3001](https://www.flux.ai/adrian95/78646-3001~u5c.md) - Part Type: Connector - Role Details: Micro SIM holder; C1 VCC, C2 RST, C3 CLK, C5 GND, C7 I/O; no card-detect switch - Manufacturer Name: Molex - Role: SIM Connector - Manufacturer Part Number: 78646-3001 - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Molex%20PDFs/micro-SIM_CardSockets(Hinged,PushPull).pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - CLK [pin C3] - GND [pin G2] - GND [pin G6] - GND [pin C5] - GND [pin G4] - GND [pin G1] - GND [pin G3] - GND [pin G5] - I/O [pin C7] - RST [pin C2] - VCC [pin C1] - VPP [pin C6] ### J_SWD — [Pin Header 01x05 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x05-254mm-vertical~cas.md) - Role: Logic-level Shifting - Part Type: Connector - Role Details: SWD debug/programming header - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### J_UART — [Pin Header 01x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md) - Role Details: USART2 debug UART header - Role: Logic-level Shifting - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### Q_PWR — [BC547BTA](https://www.flux.ai/lcsc/bc547bta~cvr.md) - JLCPCB Part Class: Extended Part - Manufacturer Name: onsemi(安森美) - LCSC Part Number: C258144 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010400_onsemi-BC547BTA_C258144.pdf - Manufacturer Part Number: BC547BTA - Part Type: Bipolar Transistors - BJT - Product Info Url: https://lcsc.com/product-detail/Transistors-NPN-PNP_ON-Semicon_BC547BTA_ON-Semicon-ON-BC547BTA_C258144.html - Role: Switching - Role Details: STM32 PB0 drives base through R_PWRKEY; collector pulls U_LTE ~PWRKEY low for boot pulse - Package or Case Code: TO-92-3_L4.8-W3.7-P2.54-L **Pins:** - B [pin 2] - C [pin 1] - E [pin 3] ### U_3V3 — [LDL1117S33R](https://www.flux.ai/lcsc/ldl1117s33r~qyb.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1912111437_STMicroelectronics-LDL1117S33R_C435835.pdf - Manufacturer Part Number: LDL1117S33R - Role: Power Conversion - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Low-Dropout-Regulators-LDO_STMicroelectronics-LDL1117S33R_C435835.html - Manufacturer Name: ST(意法半导体) - LCSC Part Number: C435835 - Package or Case Code: SOT-223-4_L6.5-W3.5-P2.30-LS7.0-BR - Part Type: Linear Voltage Regulators (LDO) - Role Details: +4V to +3V3 LDO; LDL1117S33R, 3.3V fixed SOT-223, 1117-compatible pinout GND/VOUT/VIN with tab VOUT; dropout 350mV typ/600mV max at 1.2A, ample at 100mA. **Pins:** - GND [pin 1] - VIN [pin 3] - VOUT [pin 4] - VOUT [pin 2] ### U_4V — [LMR33630ADDAR](https://www.flux.ai/lcsc/lmr33630addar~jgsz.md) - Datasheet URL: ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Flmr33630 - Role: Power Conversion - Package or Case Code: ESOP-8_L4.9-W3.9-P1.27-LS6.0-TL-EP - Manufacturer Part Number: LMR33630ADDAR - JLCPCB Part Class: Extended Part - Part Type: DC-DC Converters - Manufacturer Name: TI(德州仪器) - LCSC Part Number: C841384 - Role Details: 12V to +4V, feedback set for 4.0V; EN tied to VIN; PG left open if unused **Pins:** - BOOT [pin 7] - EN [pin 3] - EP [pin 9] - FB [pin 5] - PG [pin 4] - PGND [pin 1] - SW [pin 8] - VCC [pin 6] - VIN [pin 2] ### U_5V — [AMS1117-5.0](https://www.flux.ai/vasy_skral/ams1117-50~zsf.md) - Manufacturer Part Number: AMS1117-5.0 - Datasheet URL: https://datasheet.lcsc.com/lcsc/1810231832_Advanced-Monolithic-Systems-AMS1117-5-0_C6187.pdf - Symbol Style: parametric-v1 - Role Details: 12V to +5V AMS1117; layout requires 10x10mm copper heatsink pad plus 4 thermal vias to GND; thermals not validated without load current - Role: Power Conversion - Manufacturer Name: AMS - Part Type: Integrated Circuit **Pins:** - GND [pin 1] - TAB(VOUT) [pin 4] - VIN [pin 3] - VOUT [pin 2] ### U_COND — [LM258DR](https://www.flux.ai/lcsc/lm258dr~t3wc.md) - Manufacturer Part Number: LM258DR - LCSC Part Number: C668209 - Product Info Url: https://lcsc.com/product-detail/General-Purpose-Amplifiers_UMW-Youtai-Semiconductor-Co-Ltd-LM258DR_C668209.html - Role Details: Channel 1 buffers scaled ACS712 VIOUT to I_SENSE; Channel 2 conditions biased ZMPT101B voltage signal to V_SENSE - Part Type: Operational Amplifier - Quiescent Current: 1mA - Output Current: 40mA - Voltage Supply: 32V - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409280231_UMW-Youtai-Semiconductor-Co---Ltd--LM258DR_C668209.pdf - Role: Signal Conditioning - Operating Temperature: -25 ~ +85℃ - JLCPCB Part Class: Extended Part - Package or Case Code: SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL - Manufacturer Name: UMW(友台半导体) **Pins:** - INA- [pin 2] - INA+ [pin 3] - INB- [pin 6] - INB+ [pin 5] - OUTA [pin 1] - OUTB [pin 7] - V- [pin 4] - V+ [pin 8] ### U_LTE — [A7672SA LASE_](https://www.flux.ai/cherepanyadima/a7672sa-lase~7n.md) - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/7559/A7672SA.pdf - Symbol Style: Parametric - Part Type: RF Transceiver - Role: Cellular Modem - Manufacturer Part Number: A7672SA-LASE - Role Details: 4G LTE module; must be powered only from +4V rail; UART crosses to STM32 PA9/PA10 - Manufacturer Name: SIMCom Wireless Solutions Limited **Pins:** - ~PWRKEY [pin 1] - ~RESET [pin 16] - 1PPS [pin 100] - 1V8_GNSS [pin 97] - ADC [pin 25] - BT_ANT [pin 93] - CAM_I2C_SCL [pin 118] - CAM_I2C_SDA [pin 117] - CAM_MCLK [pin 121] - CAM_PWDN [pin 119] - CAM_RST [pin 120] - CAM_SPI_CLK [pin 124] - CAM_SPI_D0 [pin 122] - CAM_SPI_D1 [pin 123] - CTS [pin 7] - DCD [pin 5] - DTR [pin 3] - EAR_N [pin 41] - EAR_P [pin 40] - GND_1 [pin 2] - GND_1__1 [pin 17] - GND_1__10 [pin 61] - GND_1__11 [pin 62] - GND_1__12 [pin 63] - GND_1__13 [pin 64] - GND_1__14 [pin 65] - GND_1__2 [pin 18] - GND_1__3 [pin 29] - GND_1__4 [pin 39] - GND_1__5 [pin 45] - GND_1__6 [pin 46] - GND_1__7 [pin 54] - GND_1__8 [pin 58] - GND_1__9 [pin 59] - GND_2 [pin 69] - GND_2__1 [pin 70] - GND_2__10 [pin 79] - GND_2__11 [pin 80] - GND_2__12 [pin 81] - GND_2__13 [pin 82] - GND_2__14 [pin 83] - GND_2__2 [pin 71] - GND_2__3 [pin 72] - GND_2__4 [pin 73] - GND_2__5 [pin 74] - GND_2__6 [pin 75] - GND_2__7 [pin 76] - GND_2__8 [pin 77] - GND_2__9 [pin 78] - GND_3 [pin 84] - GND_3__1 [pin 85] - GND_3__2 [pin 86] - GND_3__3 [pin 87] - GND_3__4 [pin 88] - GND_3__5 [pin 89] - GND_3__6 [pin 91] - GND_3__7 [pin 92] - GND_3__8 [pin 94] - GNSS_ANT [pin 90] - GNSS_PWRCTL [pin 98] - GNSS_RXD [pin 96] - GNSS_TXD [pin 95] - GNSS_VBKP [pin 116] - GPIO1 [pin 19] - GPIO2 [pin 26] - GPIO3 [pin 48] - GPIO4 [pin 53] - I2C_SCL [pin 38] - I2C_SDA [pin 37] - LCD_BL_PWM [pin 101] - LCD_DCX [pin 107] - LCD_RST [pin 106] - LCD_SPI_CLK [pin 102] - LCD_SPI_CS [pin 105] - LCD_SPI_RXD [pin 104] - LCD_SPI_TXD [pin 103] - MIC_N [pin 43] - MIC_P [pin 42] - MK_IN_2 [pin 47] - MK_IN_3 [pin 20] - MK_IN_5 [pin 68] - MK_IN_6/I2C3_SCL [pin 36] - MK_OUT_2 [pin 44] - MK_OUT_3 [pin 21] - MK_OUT_5 [pin 67] - MK_OUT_6/I2C3_SDA [pin 35] - NC [pin 113] - NC__1 [pin 114] - NC__2 [pin 115] - NETLIGHT [pin 52] - RF_ANT [pin 60] - RI [pin 4] - RTS [pin 8] - RXD [pin 10] - SPI_CLK [pin 11] - SPI_CS [pin 12] - SPI_MISO [pin 14] - SPI_MOSI [pin 13] - STATUS [pin 66] - TXD [pin 9] - UART_LOG_RX [pin 22] - UART_LOG_TX [pin 23] - UART3_RXD [pin 49] - UART3_TXD [pin 50] - USB_BOOT [pin 6] - USB_DM [pin 28] - USB_DP [pin 27] - USIM1_CLK [pin 32] - USIM1_DATA [pin 31] - USIM1_DET [pin 34] - USIM1_RST [pin 33] - USIM1_VDD [pin 30] - USIM2_CLK [pin 109] - USIM2_DATA [pin 108] - USIM2_DET [pin 112] - USIM2_RST [pin 111] - USIM2_VDD [pin 110] - VBAT [pin 55] - VBAT__1 [pin 56] - VBAT__2 [pin 57] - VBAT_ADC [pin 51] - VBUS [pin 24] - VDD_1V8 [pin 15] - VDD_2V8 [pin 99] ### U_MCU — [STM32F103C8T6](https://www.flux.ai/jharwinbarrozo/stm32f103c8t6~qe2.md) - Manufacturer Name: STMicroelectronics - Role: Logic-level Shifting - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811151642_STMicroelectronics-STM32F103C8T6_C8734.pdf - Role Details: STM32F103C8T6 LQFP-48 main microcontroller - Part Type: Microcontroller - Manufacturer Part Number: STM32F103C8T6 **Pins:** - BOOT0 [pin 44] - NRST [pin 7] - PA0_WKUP [pin 10] - PA1 [pin 11] - PA10 [pin 31] - PA11 [pin 32] - PA12 [pin 33] - PA13 [pin 34] - PA14 [pin 37] - PA15 [pin 38] - PA2 [pin 12] - PA3 [pin 13] - PA4 [pin 14] - PA5 [pin 15] - PA6 [pin 16] - PA7 [pin 17] - PA8 [pin 29] - PA9 [pin 30] - PB0 [pin 18] - PB1 [pin 19] - PB10 [pin 21] - PB11 [pin 22] - PB12 [pin 25] - PB13 [pin 26] - PB14 [pin 27] - PB15 [pin 28] - PB2 [pin 20] - PB3 [pin 39] - PB4 [pin 40] - PB5 [pin 41] - PB6 [pin 42] - PB7 [pin 43] - PB8 [pin 45] - PB9 [pin 46] - PC13_TAMPER_RTC [pin 2] - PC14_OSC32_IN [pin 3] - PC15_OSC32_OUT [pin 4] - PD0_OSC_IN [pin 5] - PD1_OSC_OUT [pin 6] - VBAT [pin 1] - VDD [pin 24] - VDD [pin 48] - VDD [pin 36] - VDDA [pin 9] - VSS [pin 23] - VSS [pin 47] - VSS [pin 35] - VSSA [pin 8] ### Y1 — [FOXSDLF/080-20](https://www.flux.ai/adrian95/foxsdlf080-20~obe.md) - Role: Signal Generation - Datasheet URL: https://abracon.com/datasheets/Fox/FC4SD.pdf?utm_source=foxonline.com&utm_medium=301 - Manufacturer Part Number: Fox Electronics - Manufacturer Name: FOXSDLF/080-20 - Part Type: Oscillator - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: 8MHz HSE crystal between OSC_IN and OSC_OUT **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/ddsdasxdas/glecs-logic-board~53](https://www.flux.ai/ddsdasxdas/glecs-logic-board~53).* --- *Generated from [https://www.flux.ai/ddsdasxdas/glecs-logic-board~53](https://www.flux.ai/ddsdasxdas/glecs-logic-board~53)*