V-DRIVE HAT Schematic Design

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Generated the JLCPCB review package:
Open items:
  • Pre-export checks found no airwire, missing-footprint, invalid-layer, or copper-overlap blockers.
  • Manufacturing MPN review still flags generic passives and J1A/J1B headers as missing MPN metadata; JLCPCB may require manual part assignment for those.
Suggested next steps:
  1. Upload the Gerber ZIP to JLCPCB’s PCB quote viewer.
  2. Upload the JLCPCB BOM and pick-and-place files for assembly review.
  3. Verify component rotations and assign any missing generic/header parts in JLCPCB before ordering.
Fix missing MPNs
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V-DRIVE HAT Board Bring-Up Plan
Scope
Bring up the V-DRIVE HAT mezzanine board for a LILYGO T-SIM7600G-H R2 module. The HAT provides protected vehicle 12V input, an MP1584 12V-to-5V buck, CAN1 via ESP32 TWAI transceiver, CAN2 via MCP2515 plus CAN transceiver, a status LED, stacking headers, and a vehicle connector.
Pre-Power Inspection
  • Confirm J2 is the intended mechanical vehicle connector. Current schematic uses a 16-pin right-angle placeholder because a keyed OBD-II J1962 footprint was not found in the library.
  • Inspect D2 polarity: anode toward F1 / +12V_FUSED, cathode toward +12V_PROT.
  • Inspect D1 TVS polarity: cathode to +12V_PROT, anode to GND.
  • Verify no solder bridges on U4, U2, U1, U3, and J1 headers.
  • Confirm CAN termination population strategy: RT1 and RT2 are fitted only if this board is at the end of each CAN bus.
Power Bring-Up
  1. Do not plug in the LILYGO initially.
  2. Apply current-limited bench supply to J2 pin 16 and GND pins 4/5. Start at 12V with a conservative current limit.
  3. Measure +12V_RAW at J2 pin 16, +12V_PROT at U4 VIN / D1 cathode, and verify the D2 diode drop.
  4. Measure +5V at U4 output / L1 / C10 / J1 +5V pin. Expected: about 5.0V.
  5. Check U4 temperature and input current under no load.
  6. Connect a dummy 5V load before connecting the LILYGO. Increase toward the expected system load and verify stability.
  7. With power off, install the LILYGO and verify +3V3 is supplied from the LILYGO header into the HAT.
Logic and CAN Bring-Up
  • Verify +3V3 on U1 VIO, U2 VDD, U3 VIO, and pull-ups R1/R2.
  • Program ESP32 GPIOs as specified: GPIO21 TWAI_TX, GPIO39 TWAI_RX, GPIO18 SPI_SCK, GPIO23 SPI_MOSI, GPIO19 SPI_MISO, GPIO32 CAN2_CS, GPIO34 CAN2_INT, GPIO22 LED_GPIO.
  • Confirm LED_GPIO toggles LED1 through R3.
  • For CAN1, verify TWAI_TX/TWAI_RX activity and CANH/CANL differential signaling.
  • For CAN2, verify SPI communication with MCP2515 at 16MHz crystal operation, then verify MCP_TX/MCP_RX and CAN2_H/CAN2_L.
Key Probe Points
  • +12V_RAW: J2 pin 16 / F1 input
  • +12V_FUSED: F1 output / D2 anode
  • +12V_PROT: D2 cathode / U4 VIN / D1 cathode
  • +5V: L1 output / C10 / C8 / J1 +5V
  • +3V3: J1 3V3 / U2 VDD / U1-U3 VIO
  • CAN1_H/CAN1_L: U1 pins 7/6 and J2 pins 6/14
  • CAN2_H/CAN2_L: U3 pins 7/6 and J2 placeholder pins 3/11
Open Verification Items
  • Replace J2 with an exact OBD-II J1962 right-angle footprint/component before PCB layout or fabrication.
  • Confirm exact LILYGO T-SIM7600G-H R2 header pin count and physical pin mapping against the module drawing before layout.
  • Confirm MP1584 compensation/soft-start/frequency component values against the latest MPS datasheet and desired switching frequency/load transient target.

    Scope

    Pre-Power Inspection

    Power Bring-Up

    Logic and CAN Bring-Up

    Key Probe Points

    Open Verification Items

Documents

    V-DRIVE HAT Board Bring-Up Plan

Assets

stp

LILYGO T-SIM7600G-H R2 STEP mechanical reference

sim7600g-h-0303.stpDefault

V-DRIVE HAT

V-DRIVE HAT thumbnail
2-layer mezzanine HAT for LILYGO T-SIM7600G-H R2 adding dual CAN, protected 12V-to-5V power, and vehicle connector interface.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$2.79–$4.06

Digi-Key

$1.52–$1.92

HQonline

$2.02–$2.10

LCSC

$4.50–$5.04

Mouser

$7.75–$8.28

TME

$2.90

Verical

$2.45–$6.59

Controls