# 2. Micro node hardware
Micro node is the smallest CAN-PWM converter designed to control 1 - 2 ESC or servo with an external power.
Micro node may power the servo, but it is not recommended, since, due to the lack of its own DC-DC, the entire load will go to the device that powers the micro node. If you need to power a servo, it is recommended to look at mini node.
|View||Top view||Bot view|
# 2.1. Features
- 2 PWM outputs
- 2 JST SM04B connectors compatible with Dronecode Autopilot Connector Standard (opens new window)
- 2 ampers thrupass current
- Input voltage sensor
- Extra small outline
# 2.2. Wire
Schematic features. Schematic can be provided via issue.
The node has 3 connectors which are described in the table below.
|1||CAN1, CAN2||Devices that deliver power to the bus are required to provide 4.5–5.5 V on the bus power line, 5.0 V nominal. Devices that are powered from the bus should expect 4.5–5.5 V on the bus power line. The current shall not exceed 1 A per connector.|
|2||SWD||STM32 firmware updating using programmer-sniffer.|
|3||PWM1, PWM2||Connectors should be used to deliver signal and power (below 1 amp) to payload such as SERVO or ESC (without power delivery)|
Here you can find manufacturer part number of connectors it self and its mates.
|Type||MP||Suitable Wire Type||MP|
|CAN1||JST SM04B-GHS-TB(LF)(SN)||JST 4-pins cable (opens new window)||JST GHR-04V-S (opens new window) and pin SSHL-002T-P0.2 (opens new window)|
|CAN2||JST SM04B-GHS-TB(LF)(SN)||JST 4-pins cable (opens new window)||JST GHR-04V-S (opens new window) and pin SSHL-002T-P0.2 (opens new window)|
|PWM1||B-2100S03P-A110||Dupont 3-Pin Connector|
|PWM2||B-2100S03P-A110||Dupont 3-Pin Connector|
|SWD||JST SM04B-GHS-TB(LF)(SN)||JST 4-pins cable (opens new window)||JST GHR-04V-S (opens new window) and pin SSHL-002T-P0.2 (opens new window)|
Pin configuration and functions
|Pin N||CAN1, CAN2||SWD||PWM1, PWM2|
|3||CAN Low||SWDIO||PWM1, PWM2|
# 2.3. Specifications
Scheme is shown on the picture below.
|Width, mm||Length, mm||Height, mm|
Total weight of device 3 g (with cable 4.4g)
You can download 3D model on GrabCAD (opens new window)
Absolute Maximum Ratings
|V (CAN1, CAN2)||4.5||5.5||V|
Recommended operating conditions
|V (CAN1, CAN2)||5||V|
|Human-body model (HBM)||2000||V|
|Charged-device model (CDM)||500||V|
# 2.4. Description
Here you can see all connections of MCU.
# Functional Block Diagram
# Connection example diagram
# 2.5. Power Supply Recommendations
The uNODE is designed to operate from an input voltage supply range between 4.5 V and 5.5 V. 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.
# 2.6. Revision history
|v1.2.2 (opens new window)||Sep 9, 2022||Fix PWM1 and PWM2 typo, add hardware version on the board.|
|v1.2.1 (opens new window)||Aug 31, 2022||Typo mistake: PWM1 and PWM2 are mixed up, harware version is missing. Updates: Add RGB led.|
|v1.1 (opens new window)||Dec 17, 2021||The first release|