# 2. Hardware
This page is about hardware specific details. For general information, refer to the 1. General page., for software related details please refer Cyphal interface or DroneCAN interface.
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# 4.1. Features
- I2C port
- UART port
- 5v or 3.3v solderable jumper to power up payload
- Input voltage sensor
- 5v rail voltage sensor
- CAN connectors: 2 UCANPHY Micro (JST-GH 4) (opens new window), 2 6-pin Molex (opens new window)
- Weight: 6.6 g (with cable 8 g)
- LxWxH: 22 x 33 x 11.7 mm
# 4.2. Wire
Schematic can be provided via e-mail request or issue on github.
Connectors
| № | Connector | Description |
|---|---|---|
| 1 | UCANPHY Micro (JST-GH 4) | Devices that deliver power to the bus are required to provide 4.9–5.5 V on the bus power line, 5.0 V nominal. Devices that are powered from the bus should expect 4.0–5.5 V on the bus power line. The current shall not exceed 1 A per connector. |
| 2 | 6-pin Molex (502585-0670 (opens new window), 502578-0600 (opens new window)) | Contacts support up to 100 V, 2 A per contact. But the board may work only with 2S-6S. |
| 3 | SWD | STM32 firmware updating using programmer-sniffer. |
| 4 | UART, I2C | Connectors should be used to deliver signal and power (below 1 amp) to payload such as RANGFINDER |
Here (opens new window) you can find manufacturer part number of connectors it self and its mates.
Pin configuration and functions
| Pin | 2 CAN-HV | Pin | 2 CAN-LV | SWD | I2C | UART |
|---|---|---|---|---|---|---|
| 1 | Vin | 1 | 5V in | GND | Vcc | Vcc |
| 2 | Vin | 2 | CAN High | SWCLK | SCL | RXI |
| 3 | CAN High | 3 | CAN Low | SWDIO | SDA | TXO |
| 4 | CAN Low | 4 | GND | 3.3V | GND | GND |
| 5 | GND | |||||
| 6 | GND |
# 4.3. Specifications
Mechanical
Mechanical drowing is shown on the picture below.
| Width, mm | Length, mm | Height, mm | |
|---|---|---|---|
| Outline | 22.1 | 33.1 | 11.7 |
| PCB | 22.1 | 33.1 | 1.6 |
Total weight of device is 6.6 g.
You can download 3D model on GrabCAD (opens new window)
Housing
Information about case presented here.
Absolute Maximum Ratings
| Parameter | MIN | MAX | UNIT |
|---|---|---|---|
| Vin (CAN1) | 5.5 | 55* | V |
| V (CAN2, CAN3) | 4.5 | 5.5 | V |
| I max | A | ||
| Operating temperature |
*Noted Voltage should be delivered only with current limitation under 2.5 Amp.
Recommended operating conditions
| Parameter | Value | UNIT |
|---|---|---|
| Vin (CAN3) | 30 | V |
| V (CAN1, CAN2) | 5 | V |
| I max | A |
ESD ratings
| Description | Value | UNIT |
|---|---|---|
| Human-body model (HBM) | 2000 | V |
| Charged-device model (CDM) | 500 | V |
# 4.4. Description
Functional Block Diagram
Connection example diagram
Example of lw20 and Garmin lite v3 connection is shown below.
Example of lw20 and Garmin lite v3 connection in case of mini NODE (opens new window) usage is shown below.
# 4.5. Power Supply Recommendations
Device is designed to operate from an input voltage supply range between 4.5 V and 5.5 V over CAN2 or CAN3 connector, or 5.5 - 30 V from CAN1. This input supply must be able to withstand the maximum input current and maintain a stable voltage. The resistance of the input supply rail should be low enough that an input current transient does not cause a high enough drop that can cause a false UVLO fault triggering and system reset. The amount of bulk capacitance is not critical, but a 47-μF or 100-μF electrolytic capacitor is a typical choice.
# 4.6. Revision history
| version | Description |
|---|---|
| v3.1.0 | Initial version with STM32G0 MCU |