Ryan Malloy
e3642cbc4e
Astro/Starlight documentation covering hardware specs, pinout, schematics, GNSS protocol, LoRa frequencies, and getting started guides. Includes extracted datasheet images and Docker deployment.
167 lines
3.4 KiB
Markdown
167 lines
3.4 KiB
Markdown
# HTIT-Tracker V0.5 Schematic
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## Document Metadata
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- **Format:** PDF 1.4
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- **Title:** New Output
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- **Keywords:** Altium
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- **Creator:** Altium Designer
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- **Producer:** llPDFLib 3.x
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- **Creation Date:** 2023-07-31
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---
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## Schematic Components
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This is the full schematic for the Heltec Wireless Tracker V0.5, designed in Altium Designer.
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### Power Management
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| Component | Value/Part | Function |
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|-----------|-----------|----------|
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| F1 | 6V 500mA | Fuse |
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| D1 | RSB6.8S | TVS Diode |
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| D2 | 1N5819 | Schottky Diode |
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| Q1 | AO3401 | P-channel MOSFET |
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| U2 | TP4054 | LiPo Charger IC |
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| U4 | CE6260B33M | 3.3V LDO |
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| U6 | CE6260B33M | 3.3V LDO (Vext) |
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| R16 | 2K/5% | Charge current set |
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### ESP32-S3FN8 Main MCU (U7)
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**Crystal:**
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| Component | Value |
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|-----------|-------|
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| U5 | 40MHz Crystal |
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| C19, C20 | 22pF/10V |
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| X1 | 32.768KHz (RTC) |
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| C8, C22 | 4.7pF/10V |
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**Key GPIO Connections:**
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- GPIO0: USER_Key
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- GPIO1: Vbat_Read (via ADC)
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- GPIO2: ADC_Ctrl
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- GPIO3: Vext_Ctrl
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- GPIO8: LoRa_NSS
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- GPIO9: LoRa_SCK
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- GPIO10: LoRa_MOSI
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- GPIO11: LoRa_MISO
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- GPIO12: LoRa_RST
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- GPIO13: LoRa_BUSY
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- GPIO14: DIO1
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- GPIO18: LED Write Ctrl
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- GPIO19/20: USB_D-/USB_D+
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- GPIO21: LED_K (TFT backlight)
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- GPIO33: GNSS_TX
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- GPIO34: GNSS_RX
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- GPIO35: GNSS_RST
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- GPIO36: GNSS_PPS
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- GPIO38-42: TFT Display (CS, RES, RS, SCLK, SDIN)
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- GPIO47: BOOT_MODE
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- GPIO48: D_SEL
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### SX1262 LoRa Module (U12)
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| Component | Value | Function |
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|-----------|-------|----------|
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| L1 | 2.7nH | RF matching |
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| L2 | 24nH | RF filter |
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| L3 | 2.0nH | RF matching |
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| C12, C15, C18, C25 | 0.1uF | Decoupling |
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| C13, C14 | 1.8pF | RF matching |
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| U11 | UPG2179 | RF Switch |
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| X4 | 32MHz | TCXO |
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| E4 | IPEX | LoRa Antenna |
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### UC6580 GNSS Module (U9)
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| Component | Value | Function |
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|-----------|-------|----------|
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| X2 | 26MHz | TCXO |
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| X3 | 32.768KHz | RTC Crystal |
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| C34, C41 | 4.7pF | Crystal load |
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| R27 | 10K/5% | Reset pullup |
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| U8 | HDDL1L5RSS-B8 | L1/L5 LNA |
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| U10 | SW7125DE | RF Amplifier |
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| E3 | IPEX | GNSS Antenna |
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**RF Frontend:**
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| Component | Value |
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|-----------|-------|
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| L4 | 68nH |
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| L5 | 1nH |
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| L6 | 2.2nH |
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| L7 | 18nH |
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| L8 | 0R/5% |
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| L9 | 6.8nH |
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| L10 | 7nH |
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| L11 | 4.5nH |
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| EL2 | 1uH (inductor) |
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### TFT Display (U1 - 0.96" OLED)
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| Pin | Signal |
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|-----|--------|
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| SDIN | GPIO42 |
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| SCLK | GPIO41 |
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| RS | GPIO40 |
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| RES | GPIO39 |
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| CS | GPIO38 |
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| LED_K | GPIO21 (via Q4) |
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### USB Type-C (U3)
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| Pin | Signal |
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|-----|--------|
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| VBUS | VDD_5V |
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| DN1/DN2 | USB_N |
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| DP1/DP2 | USB_P |
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| CC1 | R3 (5.1K to GND) |
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| CC2 | R6 (5.1K to GND) |
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### Battery Management
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| Component | Value | Function |
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|-----------|-------|----------|
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| JP3 | 1.25X2P-LiPo | Battery connector |
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| C1 | 10uF/10V | Input cap |
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| C2 | 220nF/10V | Charge cap |
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| R13 | 390K/1% | Voltage divider |
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| R14 | 100K/1% | Voltage divider |
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| Q2 | AO3401 | Power switch |
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| Q3 | S9013 | ADC control |
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### LEDs
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| LED | Color | Resistor | Function |
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|-----|-------|----------|----------|
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| LED1 | Orange | R7 (330R) | Charging indicator |
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| LED2 | White | R10 (330R) | User LED |
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### Buttons
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| Button | Function |
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|--------|----------|
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| S1 | RESET_SW |
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| S2 | USER_SW (GPIO0) |
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---
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## Pin Headers
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### Header P2 (8-pin)
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Power and ground pins
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### Header P3 (8-pin)
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Additional GPIO
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### Header P4 (16-pin)
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Main GPIO header J2
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### Header P5 (16-pin)
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Main GPIO header J3
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---
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