Pinout

This page provides detailed wiring information for the AJAX electronic speed controller.

Port Overview

Port	Description
1	Motor 1 Phase W
2	Motor 1 Phase V
3	Motor 1 Phase U
4	Ground (GND)
5	Main Bus Positive (+)
6	Motor 1 Signal
7	Motor 2 Signal
8	Motor 3 Signal
9	Motor 4 Signal
10	Current
11	Telemetry
12	Motor 2 Phase W
13	Motor 2 Phase V
14	Motor 2 Phase U
15	Motor 3 Phase W
16	Motor 3 Phase V
17	Motor 3 Phase U
18	Main Bus Positive (+)
19	Main Bus Negative (-)
20	Motor 4 Phase W
21	Motor 4 Phase V
22	Motor 4 Phase U

Connector Pinouts

Signal Connector

Pin	Function	Wire Color
1	Ground (GND)	⚫ Black
2	Main Bus Positive (+)	🔴 Red
3	Motor 1 Signal	⚪ White
4	Motor 2 Signal	⚪ White
5	Motor 3 Signal	⚪ White
6	Motor 4 Signal	⚪ White
7	Current	🔵 Blue
8	Telemetry	🟠 Orange

Absolute Maximum Ratings

Port/Pin	Parameter	Min	Max	Unit
Main Bus	Input Voltage	12	36	V
Motor Phase Output	Voltage	V_BUS - 0.6	V_BUS + 0.6	V
Signal Input	Voltage	3.3	5.0	V
Telemetry Output	Voltage	-	3.3	V

Wiring Guidelines

Power Input

Important

• Ensure input ripple remains less than 5% of the bus voltage
• Maximum recommended input lead length: 30 cm (12 in)
• Use appropriately rated wire gauge for your application's current draw

Signal Wiring

• Connect the signal wire to your flight controller's motor output
• Supported protocols: PWM(50Hz), Dshot, Bi-Directional Dshot, Oneshot, Multishot, Proshot
• Ground wire must be connected for proper signal reference

Current Sense

The onboard current sense monitor allows the flight controller to read real-time current draw via the Current pin (port 10). To use this feature, configure the flight controller with the following gain value:

• Current Sense Gain: 6.25 mV/A

note

Current sensing requires the flight controller to support analog current input and be configured with the correct gain value. Refer to your flight controller's documentation for setup instructions.

Motor Connections

Motor	Phase U	Phase V	Phase W
Motor 1	Port 3	Port 2	Port 1
Motor 2	Port 14	Port 13	Port 12
Motor 3	Port 17	Port 16	Port 15
Motor 4	Port 22	Port 21	Port 20

note

Motor direction can be reversed by swapping any two phase wires, or via software configuration.