# GPS_tracker ## Description Battery-Powered IoT GPS Tracker — Power / Protection Review Summary (Updated) ## Project Details - **Owner:** dreamer4490 - **Created:** 1/2/2026 - **Last Updated:** 1/5/2026 - **Visibility:** Public - **System Architecture:** ```mermaid flowchart TD USB_C["USB-C Input"] --> LiChg["Li-Ion Charger with Power-Path Management"] LiChg --> BatteryHolder["Battery Holder & Protection Block"] LiChg --> Buck3V3["Low-Iq 3.3V Buck Regulator"] Buck3V3 --> MCU["ESP32-S3 & u-blox GNSS Module"] LiChg --> VBAT_MOD["Cellular Modem Power Path Enhancement"] VBAT_MOD --> Modem["Cellular Modem"] USB_C --> ESD["ESD/TVS Protection on USB-C and SIM Interface"] SIM_IF["SIM Interface"] --> ESD ESD --> SIM_HOLDER["Nano-SIM Holder"] ``` ## Key Components ### B1 — [BH-18650-A1AJ0062](https://www.flux.ai/birkanozer/bh-18650-a1aj0062.md) - Manufacturer Part Number: BH-18650-A1AJ006 - Voltage: 3.6V **Pins:** - NEGATIVE [pin -] - POSITIVE [pin +] ### D1 — [TPD4E05U06DQAR](https://www.flux.ai/jharwinflux/tpd4e05u06dqar.md) - Manufacturer Part Number: TPD4E05U06DQAR - Role Details: USB D+/D- bidirectional ESD protection - Manufacturer Name: Texas Instruments Inc. - Datasheet URL: https://www.ti.com/lit/ds/symlink/tpd4e05u06.pdf - Part Type: Diode - License: https://creativecommons.org/licenses/by/4.0/ - Role: Protection **Pins:** - D1- [pin 2] - D1+ [pin 1] - D2- [pin 5] - D2+ [pin 4] - GND_1 [pin 3] - GND_2 [pin 8] - NC_1 [pin 6] - NC_2 [pin 7] - NC_3 [pin 9] - NC_4 [pin 10] ### D2 — [TVS0500DRV](https://www.flux.ai/kicad-part-library/tvs0500drv.md) - Package or Case Code: WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm - Role: Protection - Datasheet URL: http://www.ti.com/lit/ds/symlink/tvs0500.pdf - Role Details: Surge protection for USB-C VBUS - Manufacturer Name: Texas Instruments Inc. - Package: 6-WSON - Manufacturer Part Number: TVS0500DRV **Pins:** - GND [pin 7] - GND [pin 1] - GND [pin 2] - GND [pin 3] - IN [pin 5] - IN [pin 6] - IN [pin 4] ### IC1 — [BQ24074RGTR](https://www.flux.ai/vasyl/bq24074rgtr.md) - Manufacturer Name: Texas Instruments - Part Type: Battery Chargers - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fbq24074 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: BQ24074RGTR **Pins:** - ~CE [pin 4] - ~CHG [pin 9] - ~PGOOD [pin 7] - BAT_2 [pin 2] - BAT_3 [pin 3] - EN1 [pin 6] - EN2 [pin 5] - EXP [pin 17] - ILIM [pin 12] - IN [pin 13] - ISET [pin 16] - ITERM [pin 15] - OUT_10 [pin 10] - OUT_11 [pin 11] - TMR [pin 14] - TS [pin 1] - VSS [pin 8] ### IC4 — [SIM7080G](https://www.flux.ai/adrian95/sim7080g.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: SIMCom Wireless Solutions Limited - Manufacturer Part Number: SIM7080G - Part Type: Integrated Circuit - Datasheet URL: https://www.waveshare.com/w/upload/e/e7/SIM7080G_Hardware_Design_V1.03.pdf **Pins:** - ~SPI_MOSI [pin 49] - ~USB_BOOT [pin 20] - ADC [pin 38] - ANT_CONTROL0 [pin 44] - ANT_CONTROL1 [pin 43] - GND_1 [pin 8] - GND_10 [pin 37] - GND_11 [pin 45] - GND_12 [pin 63] - GND_13 [pin 66] - GND_14 [pin 67] - GND_15 [pin 69] - GND_16 [pin 70] - GND_17 [pin 71] - GND_18 [pin 72] - GND_19 [pin 73] - GND_2 [pin 13] - GND_20 [pin 74] - GND_21 [pin 75] - GND_22 [pin 76] - GND_23 [pin 77] - GND_3 [pin 19] - GND_4 [pin 21] - GND_5 [pin 27] - GND_6 [pin 30] - GND_7 [pin 31] - GND_8 [pin 33] - GND_9 [pin 36] - GNSS_ANT [pin 68] - GPIO1 [pin 57] - GPIO2 [pin 58] - GPIO3 [pin 59] - GPIO4 [pin 60] - GPIO5 [pin 14] - I2C_SCL [pin 65] - I2C_SDA [pin 64] - NC_1 [pin 28] - NC_2 [pin 29] - NC_3 [pin 46] - NC_4 [pin 47] - NC_5 [pin 52] - NC_6 [pin 53] - NC_7 [pin 54] - NC_8 [pin 55] - NC_9 [pin 56] - NETLIGHT [pin 41] - PCM_CLK [pin 11] - PCM_DIN [pin 9] - PCM_DOUT [pin 10] - PCM_SYNC [pin 12] - PWRKEY [pin 39] - RF_ANT [pin 32] - SIM_CLK [pin 16] - SIM_DATA [pin 15] - SIM_RST [pin 17] - SIM_VDD [pin 18] - SPI_CLK [pin 50] - SPI_CS [pin 48] - SPI_MISO [pin 51] - STATUS [pin 42] - UART1_CTS [pin 4] - UART1_DCD [pin 5] - UART1_DTR [pin 6] - UART1_RI [pin 7] - UART1_RTS [pin 3] - UART1_RXD [pin 2] - UART1_TXD [pin 1] - UART2_RXD [pin 23] - UART2_TXD [pin 22] - UART3_RXD [pin 62] - UART3_TXD [pin 61] - USB_DM [pin 26] - USB_DP [pin 25] - USB_VBUS [pin 24] - VBAT_1 [pin 34] - VBAT_2 [pin 35] - VDD_EXT [pin 40] ### J_ANT — [U.FL-R-SMT-1(10)](https://www.flux.ai/jecstronic/upfl-r-smt-110.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Hirose%20PDFs/EDC3-302540-10.tif.pdf - Manufacturer Name: Hirose Electric Co Ltd - Part Type: Connector - Manufacturer Part Number: U.FL-R-SMT-1(10) - Role Details: Cellular antenna connector, 50Ω **Pins:** - Center_Contact [pin 2] - Outer_Contact [pin 1] - Outer_Contact [pin 3] ### J1 — [SIM8060-6-0-14-00-A](https://www.flux.ai/adrian95/sim8060-6-0-14-00-a.md) - Datasheet URL: https://gct.co/files/drawings/sim8060.pdf - Part Type: Connector - Manufacturer Part Number: SIM8060-6-0-14-00-A - Package or Case Code: SIM8060601400A - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: GCT (GLOBAL CONNECTOR TECHNOLOGY) **Pins:** - CLK [pin C3] - GND_1 [pin C5] - GND_2 [pin G1] - GND_3 [pin G2] - GND_4 [pin G3] - GND_5 [pin G4] - I/O [pin C7] - RST [pin C2] - VCC [pin C1] - VPP [pin C6] ### LED RGB — [APA102](https://www.flux.ai/kicad-part-library/apa102.md) - Part Type: LED SMD - Package or Case Code: LED_RGB_5050-6 - Datasheet URL: http://www.led-color.com/upload/201506/APA102%20LED.pdf - Manufacturer Part Number: APA102 **Pins:** - CI [pin 2] - CO [pin 5] - DI [pin 1] - DO [pin 6] - GND [pin 3] - VCC [pin 4] ### LED1 — [LED 0603 (1608 Metric)](https://www.flux.ai/jharwinbarrozo/led-0603-1608-metric.md) - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [LED 0603 (1608 Metric)](https://www.flux.ai/jharwinbarrozo/led-0603-1608-metric.md) - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [LED RGB 5050-6](https://www.flux.ai/adrian95/led-rgb-5050-6.md) - Manufacturer Name: Yetda Industry - Part Type: LED - Datasheet URL: http://cdn.sparkfun.com/datasheets/Components/LED/5060BRG4.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 5060BRG4 **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] - P4 [pin 4] - P5 [pin 5] - P6 [pin 6] ### Q2 — [AO3407A](https://www.flux.ai/lcsc/ao3407a.md) - Part Type: MOSFETs - Transistor Type: N-channel MOSFET - Manufacturer Name: UMW(友台半导体) - Drain to Source Voltage: 30V - Manufacturer Part Number: AO3407A - Package or Case Code: SOT-23_L2.9-W1.3-P1.90-LS2.4-BR - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2311091734_UMW-Youtai-Semiconductor-Co---Ltd--AO3407A_C347478.pdf - Continuous Drain Current: 5A - LCSC Part Number: C347478 - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/MOSFET_Youtai-Semiconductor-Co-Ltd-AO3407A_C347478.html **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### RF1 — [U.FL-R-SMT-1(40)](https://www.flux.ai/lcsc/upfl-r-smt-140.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1912111437_HRS-Hirose-U-FL-R-SMT-1-40_C434816.pdf - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/RF-Connectors-Coaxial-Connectors_Hirose-HRS-U-FL-R-SMT-1-40_C434816.html - Package or Case Code: ANT-SMD_UFL-R-SMT-1 - LCSC Part Number: C434816 - Manufacturer Part Number: U.FL-R-SMT-1(40) - Manufacturer Name: HRS(广濑) - Part Type: RF Connectors / Coaxial Connectors **Pins:** - GND [pin 3] - GND [pin 1] - SIG [pin 2] ### U1 — [ESP32-S3-MINI-1U-N8](https://www.flux.ai/vasyl/esp32-s3-mini-1u-n8.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: MCU - Manufacturer Name: Espressif Systems - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-s3-mini-1_mini-1u_datasheet_en.pdf - Manufacturer Part Number: ESP32-S3-MINI-1U-N8 **Pins:** - <-GND [pin 61_4] - 3V3 [pin 3] - EN [pin 45] - GND [pin 59] - GND [pin 65] - GND [pin 64] - GND [pin 50] - GND [pin 61_6] - GND [pin 57] - GND [pin 58] - GND [pin 42] - GND [pin 60] - GND [pin 52] - GND [pin 43] - GND [pin 61_8] - GND [pin 63] - GND [pin 61_0] - GND [pin 55] - GND [pin 61_7] - GND [pin 51] - GND [pin 54] - GND [pin 49] - GND [pin 61_5] - GND [pin 2] - GND [pin 61_1] - GND [pin 56] - GND [pin 47] - GND [pin 62] - GND [pin 48] - GND [pin 53] - GND [pin 46] - GND [pin 1] - GND [pin 61_2] - GND [pin 61_3] - IO0 [pin 4] - IO1 [pin 5] - IO10 [pin 14] - IO11 [pin 15] - IO12 [pin 16] - IO13 [pin 17] - IO14 [pin 18] - IO15 [pin 19] - IO16 [pin 20] - IO17 [pin 21] - IO18 [pin 22] - IO19 [pin 23] - IO2 [pin 6] - IO20 [pin 24] - IO21 [pin 25] - IO26 [pin 26] - IO3 [pin 7] - IO33 [pin 28] - IO34 [pin 29] - IO35 [pin 31] - IO36 [pin 32] - IO37 [pin 33] - IO38 [pin 34] - IO39 [pin 35] - IO4 [pin 8] - IO40 [pin 36] - IO41 [pin 37] - IO42 [pin 38] - IO45 [pin 41] - IO46 [pin 44] - IO47 [pin 27] - IO48 [pin 30] - IO5 [pin 9] - IO6 [pin 10] - IO7 [pin 11] - IO8 [pin 12] - IO9 [pin 13] - RXD0 [pin 40] - TXD0 [pin 39] ### U2 — [TPS62840DLCR](https://www.flux.ai/lcsc/tps62840dlcr.md) - Package or Case Code: VSON-8_L2.0-W1.5-P0.50-BL - Manufacturer Name: TI(德州仪器) - LCSC Part Number: C2071859 - Manufacturer Part Number: TPS62840DLCR - Role: Power Conversion - Part Type: DC-DC Converters - JLCPCB Part Class: Extended Part - Role Details: 3.3V Buck Converter for ESP32-S3, low quiescent current **Pins:** - EN [pin 4] - GND [pin 1] - MODE [pin 3] - STOP [pin 6] - SW [pin 7] - VIN [pin 2] - VOS [pin 8] - VSET [pin 5] ### U3 — [AP22916BCA4-7](https://www.flux.ai/collinsemasi/ap22916bca4-7.md) - Manufacturer Name: Diodes Incorporated - Role Details: High-side P-channel load switch for SIM7080G VBAT power gating - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP22916.pdf - Role: Protection - Manufacturer Part Number: AP22916BCA4-7 **Pins:** - GND [pin B1] - ON [pin B2] - VIN [pin A2] - VOUT [pin A1] ### U4 — [3V 500mA LDO](https://www.flux.ai/corynrobinson/3v-500ma-ldo.md) - Max Output Voltage: 3V - Operating Temperature: -40℃~+125℃@(Tj) - Output Current: 0.5A - Package or Case Code: SC-74A, SOT-753 - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftlv755p - Part Type: Linear Voltage Regulators (LDO) - Manufacturer Part Number: TLV75530PDBVR - Dropout Voltage: 238mV@(500mA) - Max Input Voltage: 5.5V - Product Info Url: https://www.digikey.com/en/products/detail/texas-instruments/TLV75530PDBVR/9356540 **Pins:** - EN [pin 3] - GND [pin 2] - IN [pin 1] - NC [pin 4] - OUT [pin 5] ### USB-C — [USB-C 2.0 Receptacle](https://www.flux.ai/corynrobinson/usb-c-20-receptacle.md) - Manufacturer Name: GTC - Manufacturer Part Number: USB4105-GF-A - Purchase Url: https://www.digikey.com/en/products/detail/gct/USB4105-GF-A/11198441 - Datasheet URL: https://gct.co/files/drawings/usb4105.pdf - Part Type: USB C **Pins:** - CC1 [pin 6] - CC2 [pin 12] - D- [pin 7] - D- [pin 9] - D+ [pin 10] - D+ [pin 8] - GND [pin 1] - GND [pin 16] - GND [pin 15] - GND [pin 2] - SBU1 [pin 11] - SBU2 [pin 5] - VBUS [pin 3] - VBUS [pin 14] - VBUS [pin 4] - VBUS [pin 13] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/dreamer4490/gpstracker](https://www.flux.ai/dreamer4490/gpstracker).* --- *Generated from [https://www.flux.ai/dreamer4490/gpstracker](https://www.flux.ai/dreamer4490/gpstracker)*