# Striped Silver Heat-Ray ## Description Compact wearable smart cat collar PCB focused on ultra-low power, miniaturized size, curved-edge waterproof-friendly mechanical fit, GNSS tracking, motion sensing, RFID compatibility, Li-ion charging, and robust mass-production readiness. ## Project Details - **Owner:** yanghaorun - **Created:** 3/24/2026 - **Last Updated:** 3/25/2026 - **Visibility:** Public - **Operating Voltage:** 1-cell Li-ion/LiPo 3.0V-4.2V input, regulated 3.3V system rail - **System Architecture:** ```mermaid flowchart TD POGO["Magnetic Pogo 5V In"] --> CHG["TP4056 Charger"] CHG --> BAT["Li-ion Battery"] BAT --> PMU["AXP192 PMU"] PMU --> SYS33["3.3V System Rail"] PMU --> GNSSPWR["GNSS Switched Rail"] SYS33 --> MCU["GD32E230 MCU"] SYS33 --> IMU["LIS2DH12 Accelerometer"] SYS33 --> RFID["EM4305 RFID"] GNSSPWR --> GNSS["BC20-BD GNSS"] MCU -->|UART| GNSS MCU -->|I2C| IMU MCU -->|Control| SW["SI2302 Power Switch"] SW --> GNSSPWR RFID --> ANT125["125kHz RFID Coil"] GNSS --> RFANT["GNSS RF Antenna"] MCU --> DBG["SWD and Test Points"] ``` - **Manufacturing Quantity Target:** Mass production capable compact 2-layer board preferred - **Operating Temperature:** 0C to 50C wearable outdoor use - **Power Requirements:** Ultra-low power wearable Li-ion system with GNSS burst activity, always-on motion sensing, RFID support, and magnetic pogo charging - **Connectivity:** GNSS UART, I2C sensor bus, RFID LF analog front end, SWD debug, charging pads - **Reliability Target (MTBF):** Wearable outdoor pet tracker with waterproof-friendly layout and robust field operation ## Key Components ### ANT1 — [SR4G053](https://www.flux.ai/adrian95/sr4g053.md) - Role Details: Chip antenna for GNSS receiver; NC pads intentionally left unconnected per antenna footprint guidance - Role: GNSS Antenna - Part Type: Antenna - Manufacturer Name: Antenova - Package: Chip antenna - Datasheet URL: https://www.antenova.com/wp-content/uploads/2019/05/Raptor-GNSS-SR4G053-PS-1.1.pdf - Manufacturer Part Number: SR4G053 - Implementation Details: Chip antenna. NC_1 through NC_5 are intentional no-connect pins per antenna footprint guidance. - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - FEED [pin 3] - NC_1 [pin 1] - NC_2 [pin 2] - NC_3 [pin 4] - NC_4 [pin 5] - NC_5 [pin 6] ### J1 — [S2B-PH-SM4-TB(LF)(SN)](https://www.flux.ai/adrian95/s2b-ph-sm4-tblfsn.md) - Manufacturer Part Number: S2B-PH-SM4-TB(LF)(SN) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Role: Battery Connector - Role Details: Board-mounted Li-ion battery connector - Manufacturer Name: JST Sales America Inc. - Package: JST PH 2-pin SMT - Part Type: Connector **Pins:** - P1 [pin 1] - P2 [pin 2] ### J2 — [ARM JTAG SWD 10Pin 0.05" Connector](https://www.flux.ai/vasy_skral/arm-jtag-swd-10pin-005-connector.md) - Manufacturer Part Number: FTSH-105-01-L-DV-007-K - Part Type: Connector - Implementation Details: Minimal SWD header. SWO/TDO, GNDDetect, and NC/TDI are intentionally not connected. - Datasheet URL: https://suddendocs.samtec.com/catalog_english/ftsh_smt.pdf - Manufacturer Name: Analog Devices - Role: SWD Debug - Role Details: SWD debug connector; SWO/TDO, GNDDetect, and NC/TDI intentionally left unconnected for minimal SWD implementation - Package: 1.27mm SMT header **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] ### Q1 — [SI2302DDS-T1-GE3](https://www.flux.ai/lcsc/si2302dds-t1-ge3.md) - LCSC Part Number: C194092 - JLCPCB Part Class: Extended Part - Manufacturer Name: VISHAY(威世) - Manufacturer Part Number: SI2302DDS-T1-GE3 - Role: Power Switch - Package or Case Code: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR-3 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1811101814_Vishay-Intertech-SI2302DDS-T1-GE3_C194092.pdf - Package: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR-3 - Part Type: MOSFETs - Role Details: Low-side or rail-control MOSFET used for GNSS or subsystem power gating - Product Info Url: https://lcsc.com/product-detail/MOSFET_Vishay-Intertech_SI2302DDS-T1-GE3_Vishay-Intertech-SI2302DDS-T1-GE3_C194092.html **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### U1 — [GD32E230K6U6](https://www.flux.ai/lcsc/gd32e230k6u6.md) - Implementation Details: Unused GPIOs PA0, PA8, PA12, PA15, PB3, PB4, PB5, and PB8 are intentionally left unconnected and must be configured in firmware to a non-floating state for low power. - Part Type: Microcontroller Units (MCUs/MPUs/SOCs) - JLCPCB Part Class: Extended Part - Package or Case Code: QFN-32_L5.0-W5.0-P0.50-BL-EP3.4 - Manufacturer Name: GigaDevice(兆易创新) - Role Details: GD32E230 main controller for wearable collar power management, GNSS control, accelerometer interface, RFID interface, and SWD debug; unused GPIOs PA0 PA8 PA12 PA15 PB3 PB4 PB5 PB8 are intentionally unconnected and must be biased in firmware for low power - Software: Configure unused GPIOs as analog inputs or driven outputs with no floating state for lowest sleep current - Manufacturer Part Number: GD32E230K6U6 - Role: Main MCU - LCSC Part Number: C350645 - Package: QFN-32 **Pins:** - BOOT0 [pin 31] - NRST [pin 4] - OSCIN/PF0 [pin 2] - OSCOUT/PF1 [pin 3] - PA0 [pin 6] - PA1 [pin 7] - PA10 [pin 20] - PA11 [pin 21] - PA12 [pin 22] - PA13 [pin 23] - PA14 [pin 24] - PA15 [pin 25] - PA2 [pin 8] - PA3 [pin 9] - PA4 [pin 10] - PA5 [pin 11] - PA6 [pin 12] - PA7 [pin 13] - PA8 [pin 18] - PA9 [pin 19] - PB0 [pin 14] - PB1 [pin 15] - PB2 [pin 16] - PB3 [pin 26] - PB4 [pin 27] - PB5 [pin 28] - PB6 [pin 29] - PB7 [pin 30] - PB8 [pin 32] - VDD [pin 17] - VDD [pin 1] - VDDA [pin 5] - VSS,VSSA [pin 33] ### U3 — [LIS2DH12TR](https://www.flux.ai/lcsc/lis2dh12tr.md) - Role: Accelerometer - JLCPCB Part Class: Extended Part - Manufacturer Part Number: LIS2DH12TR - Manufacturer Name: ST(意法半导体) - Termination: 16-pin LGA - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810010329_STMicroelectronics-LIS2DH12TR_C110926.pdf - Package: LGA-12_L2.0-W2.0-P0.50-BL - Sensor Type: 3-axis digital accelerometer - Part Type: Motion Sensors - Accelerometers - Role Details: Low-power motion sensor connected over I2C with interrupt output; RES pin intentionally left NC per library symbol - Package or Case Code: LGA-12_L2.0-W2.0-P0.50-BL - Product Info Url: https://lcsc.com/product-detail/Motion-Sensors-Accelerometers_STMicroelectronics_LIS2DH12TR_STMicroelectronics-LIS2DH12TR_C110926.html - LCSC Part Number: C110926 **Pins:** - CS [pin 2] - GND [pin 8] - GND [pin 6] - GND [pin 7] - INT1 [pin 12] - INT2 [pin 11] - RES [pin 5] - SCL/SPC [pin 1] - SDA/SDI/SDO [pin 4] - SDO/SA0 [pin 3] - VDD [pin 9] - VDD_IO [pin 10] ### U5 — [TP4056X-42-ESOP8](https://www.flux.ai/lcsc/tp4056x-42-esop8.md) - Manufacturer Part Number: TP4056X-42-ESOP8 - JLCPCB Part Class: Extended Part - LCSC Part Number: C2763448 - Package: SOP-8_L4.9-W3.9-P1.27-LS6.0-TL-EP - Part Type: Battery Management ICs - Package or Case Code: SOP-8_L4.9-W3.9-P1.27-LS6.0-TL-EP - Role Details: Linear Li-ion charger for 5V magnetic pogo charging input - Manufacturer Name: TOPPOWER(南京拓微) - Role: Battery Charger **Pins:** - ~{CHRG} [pin 7] - ~{STDBY} [pin 6] - BAT [pin 5] - CE [pin 8] - EP [pin 9] - GND [pin 3] - PROG [pin 2] - TEMP [pin 1] - VCC [pin 4] ### U6 — [SMF5.0A](https://www.flux.ai/lcsc/smf5p0a.md) - Role Details: Protects magnetic charging input against ESD and surge events - Diode Type: Schottky Diode - LCSC Part Number: C2990427 - Forward Voltage: 0.45V to 0.55V (at 1A)V - Manufacturer Part Number: SMF5.0A - Role: TVS Protection - Max Reverse Voltage: 5V - Part Type: TVS - Manufacturer Name: Liown(里阳半导体) - Package or Case Code: SOD-123FL_L2.8-W1.8-LS3.6-RD - JLCPCB Part Class: Extended Part - Package: SOD-123 **Pins:** - 1 [pin 1] - 2 [pin 2] ### X1 — [TCXM32768K2NGBCZT2T](https://www.flux.ai/lcsc/tcxm32768k2ngbczt2t.md) - Role Details: 32.768kHz watch crystal for low-power timing support - Part Type: Crystals - Manufacturer Part Number: TCXM32768K2NGBCZT2T - LCSC Part Number: C164062 - Package: OSC-SMD_L3.2-W1.5 - Role: RTC Crystal - Manufacturer Name: YJX(雅晶鑫) - Product Info Url: https://lcsc.com/product-detail/SMD-Crystals_SMD-3215-2P-32-768KHZ-12-5PF-10PPM_C164062.html - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - JLCPCB Part Class: Extended Part - Package or Case Code: OSC-SMD_L3.2-W1.5 **Pins:** - OSC1 [pin 1] - OSC2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/yanghaorun/striped-silver-heat-ray](https://www.flux.ai/yanghaorun/striped-silver-heat-ray).* --- *Generated from [https://www.flux.ai/yanghaorun/striped-silver-heat-ray](https://www.flux.ai/yanghaorun/striped-silver-heat-ray)*