Cube Red
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The Cube Red is a professional dual FMU flight control system that ensures operational reliability through its two dual-core, double-precision FPU processors. The newly added Ethernet interface and DSI out provide an unprecedented flight experience. An Isolated Static Air port minimizes disruptions from external airflow, ensuring stable static pressure. Also with Ardupilot firmware, you can utilize this unit with any type of UXV.
Powerful processing performance is provided by two STM32H7 dual-core processors, each equipped with double-precision FPU (Floating Point Unit) operations.
Cube Red is equipped with 4 sets of IMUs and 3 barometers for redundancy, ensuring continuous safe operation during flight.
Replaceable fully closed uppercase and isolated static air ducts provide stable pressure to barometers for accurate altitude measurement.
Provides foams with different hardness options, catering to various flight purposes.
The CAN FD port offers real-time high transmission rates.
The Type-C Debugging interface has been updated to the future-proof USB Type-C standard.
About
Description
POWER input voltage / rated input current
4.1 - 5.7 V / 2.5 A; 0 - 20 V is safe for the system but it will not work
POWER rated output / input power
14 W
USB port input voltage / rated input current
4 - 5.7 V / 250 mA
Servo rail input voltage
4 - 10.5 V
Waterproof performance
Not waterproof. External waterproof protection is needed
Operation Temperature
-10° / 55°
Connector
Connector Type
GPS1
JST-GH 1.25 mm (8-pin)
GPS2
JST-GH 1.25 mm (6-pin)
TELEM1
JST-GH 1.25 mm (6-pin)
TELEM2
JST-GH 1.25 mm (6-pin)
I2C2
JST-GH 1.25 mm (4-pin)
USB
JST-GH 1.25 mm (6-pin)
CAN1
JST-GH 1.25 mm (4-pin)
CAN2
JST-GH 1.25 mm (4-pin)
CAN3
JST-GH 1.25 mm (4-pin)
POWER1
Molex CLIK-Mate 2mm (6-pin)
POWER2
Molex CLIK-Mate 2mm (6-pin)
ADC
JST-GH 1.25 mm (3-pin)
DSI
JST-GH 1.25 mm (15-pin)
ETH
TE Multi-purp pluh(8P)
Pin#
Name
I/O
Description
1
FMU_SWDIO
I/O
FMU serial wire debug I/O
2
FMU_LED_AMBER
O
Boot error LED (drive only, controlled by FET)
3
FMU_SWCLK
O
FMU serial wire debug clock
4
I2C_2_SDA
I/O
I2C Serial Data Tx/Rx
5
EXTERN_CS
O
Chip select for external SPI (NC, just for debugging)
6
I2C_2_SCL
O
I2C Serial Clock Signal
7
FMU_!RESET
I
Reset pin for the FMU
8
CAN_L_3
I/O
CAN bus Low Signal Driver
9
VDD_SERVO_IN
I
Power for last resort I/O failsafe
10
CAN_H_3
I/O
CAN bus High Signal Driver
11
EXTERN_DRDY
I
Interrupt pin for external SPI (NC, just for debugging)
12
SERIAL_5_RX
I
UART 5 RX (Receive Data)
13
GND
System GND
14
SERIAL_5_TX
O
UART 5 TX (Transmit Data)
15
GND
System GND
16
SERIAL_4_RX
I
UART 4 RX (Receive Data)
17
SAFETY
Safety button input
18
SERIAL_4_TX
O
UART 4 TX (Transmit Data)
19
VDD_3V3_SPEKTRUM_EN
O
Enable for the Spektrum voltage regulator
20
SERIAL_3_RX
I
UART 3 RX (Receive Data)
21
PRESSURE_SENS_IN
AI
Analogue Signal port, for pressure sensor, Laser range finder, or Sonar
22
SERIAL_3_TX
O
UART 3 TX (Transmit Data)
23
AUX_BATT_VOLTAGE_SENS
AI
Voltage sense for Aux battery input
24
ALARM
O
Buzzer PWM Signal
25
AUX_BATT_CURRENT_SENS
AI
Current sense for Aux battery input
26
IO_VDD_3V3
I
IO chip power, pinned through for debug
27
VDD_5V_PERIPH_EN
O
Enable voltage supply for Peripherals
28
IO_LED_SAFET_PROT
O
IO-LED_SAFETY (safety LED) pinned out for IRIS
29
VBUS
I
USB VBus (VDD)
30
SERIAL_2_RTS
UART 2 RTS (Request To Send)
31
OTG_DP1
I/O
USB Data+ (D)
32
SERIAL_2_CTS
UART 2 CTS (Clear To Send)
33
OTG_DM1
I/O
USB Data- (M)
34
SERIAL_2_RX
I
UART 2 RX (Receive Data)
35
I2C_1_SDA
I/O
I2C Serial Data Tx/Rx
36
SERIAL_2_TX
O
UART 2 TX (Transmit Data)
37
I2C_1_SCL
O
I2C Serial Clock Signal
38
SERIAL_1_RX
I
UART 1 RX (Receive Data)
39
CAN_L_2
I/O
FMU CAN bus Low Signal Driver
40
SERIAL_1_TX
O
UART 1 TX (Transmit Data)
41
CAN_H_2
I/O
FMU CAN bus High Signal Driver
42
SERIAL_1_RTS
UART 1 RTS (Request To Send)
43
VDD_5V_PERIPH_OC
I
Error state message from Peripheral power supply
44
SERIAL_1_CTS
UART 1 CTS (Clear To Send)
45
VDD_5V_HIPOWER_OC
I
Error state message from High power Peripheral power supply
46
IO_USART_1_TX
O
I/O USART 1 TX
47
BATT_VOLTAGE_SENS_PROT
AI
Voltage sense from main battery
48
IO_USART1_RX_SPECTRUM_DSM
O
Signal from Spectrum receiver
49
BATT_CURRENT_SENS_PROT
AI
Current sense from main battery
50
FMU_CH1_PROT
O
FMU PWM output channel 1
51
SPI_EXT_MOSI
O
External SPI, for debug only
52
FMU_CH2_PROT
O
FMU PWM output channel 2
53
VDD_SERVO
I
VDD_Servo, for monitoring servo bus
54
FMU_CH3_PROT
O
FMU PWM Output Channel 3
55
VDD_BRICK_VALID
I
Main Power valid signal
56
FMU_CH4_PROT
O
FMU PWM Output Channel 4
57
VDD_BACKUP_VALID
I
Backup Power valid Signal
58
FMU_CH5_PROT
O
FMU PWM Output Channel 5
59
VBUS_VALID
I
USB bus valid signal
60
FMU_CH6_PROT
O
FMU PWM Output Channel 6
61
VDD_5V_IN_PROT
I
Main power (5V) into FMU from power selection
62
PPM_SBUS_PROT
I
PPM / S.Bus Signal Input
63
VDD_5V_IN_PROT
I
Main power (5V) into FMU from power selection
64
S.BUS_OUT
O
S.Bus Signal Output
65
IO_VDD_5V5
O
IO VDD 5.5 V
66
IO_CH8_PROT
O
I/O PWM Output Channel 8
67
SPI_EXT_MISO
I
External SPI, for Debug only
68
IO_CH7_PROT
O
I/O PWM Channel 7
69
IO_SWDIO
I/O
I/O serial wire debug
70
IO_CH6_PROT
O
I/O PWM Output Channel 6
71
IO_SWCLK
O
I/O Serial Wire Debug Clock
72
IO_CH5_PROT
O
I/O PWM Output Channel 5
73
SPI_EXT_SCK
O
External SPI, for Debug only
74
IO_CH4_PROT
O
I/O PWM Output Channel 4
75
IO_!RESET
I
I/O Reset Pin
76
IO_CH3_PROT
O
I/O PWM Output Channel 3
77
CAN_L_1
I/O
FMU CAN bus Low Signal Driver
78
IO_CH2_PROT
O
I/O PWM Output Channel 2
79
CAN_H_1
I/O
FMU CAN bus High Signal Driver
80
IO_CH1_PROT
O
I/O PWM Output Channel 1
Pin#
Name
I/O
Description
1
GND
System GND
2
FMU_BOOT
I
FMU Boot
3
FC_NET_TX+
I/O
Ethernet TX+,Auto-MDIX support
4
NC
Use for future
5
GND
6
IO_BOOT
IO MCU BOOT
7
FC_NET_TX-
I/O
Ethernet TX-,Auto-MDIX support
8
NC
Use for future
9
GND
System GND
10
NC
Use for future
11
FC_NET_RX+
I/O
Ethernet RX+,Auto-MDIX support
12
NC
Use for future
13
GND
System GND
14
NC
Use for future
15
FC_NET_RX-
I/O
Ethernet RX-,Auto-MDIX support
16
NC
Use for future
17
GND
System GND
18
NC
Use for future
19
FC_NET_LEDY
O
Link Speed LED Indication
20
NC
Use for future
21
FC_NET_LEDG
O
Ethernet Link activity LED Indication
22
NC
Use for future
23
FC_NET_VCC
I
Ethernet 3.3V Power in
24
NC
Use for future
25
Timestamp rtc
I
Timestamp RTC
26
NC
Use for future
27
GND
System GND
28
NC
Use for future
29
CAN_L_1
I/O
CAN bus Low Signal Driver
30
NC
Use for future
31
CAN_H_1
I/O
CAN bus High Signal Driver
32
NC
Use for future
33
CAN_L_2
I/O
CAN bus Low Signal Driver
34
NC
Use for future
35
CAN_H_2
I/O
CAN bus High Signal Driver
36
NC
Use for future
37
CAN_L_3
I/O
CAN bus Low Signal Driver
38
NC
Use for future
39
CAN_H_3
I/O
CAN bus High Signal Driver
40
NC
Use for future
41
GND
System GND
42
NC
Use for future
43
UART8_RX
I
IO UART 8 RX (Receive Data)
44
NC
Use for future
45
UART8_TX
O
IO UART 8 TX (Transmit Data)
46
NC
Use for future
47
GND
System GND
48
NC
Use for future
49
DSI_CKP
O
MIPI DSI Host Clock Postive
50
NC
Use for future
51
DSI_CKN
O
MIPI DSI Host Clock Negative
52
NC
Use for future
53
GND
System GND
54
NC
Use for future
55
DSI_D0P
O
MIPI DSI Host DATA0 Postive
56
NC
Use for future
57
DSI_D0N
O
MIPI DSI Host DATA0 Negative
58
NC
Use for future
59
GND
System GND
60
NC
Use for future
61
DSI_D1P
O
MIPI DSI Host DATA1 Postive
62
NC
Use for future
63
DSI_D1N
O
MIPI DSI Host DATA1 Negative
64
NC
Use for future
65
GND
System GND
66
NC
Use for future
67
FMU_DAC
O
FMU Analogue output
68
NC
Use for future
69
IO_DAC
O
IO Analogue output
70
NC
Use for future
71
GND
System GND
72
NC
Use for future
73
VDD_5V_IN_backup
I
Main power (5V) into FMU from power selection
74
NC
Use for future
75
VDD_5V_IN_backup
I
Main power (5V) into FMU from power selection
76
NC
Use for future
77
VDD_5V_IN_backup
I
Main power (5V) into FMU from power selection
78
NC
Use for future
79
VDD_5V_IN_backup
I
Main power (5V) into FMU from power selection
80
NC
Use for future
Name
Function
Marking
SERIAL 1 / UART 1
UART 1 with hardware flow control. 3.3V-5V CMOS TTL level, with ESD protection
TELEM1
SERIAL 2 / UART 2
UART 2 with hardware flow control. 3.3V-5V CMOS TTL level, with ESD protection
TELEM2
SERIAL 3 / UART 3 / I2C 1
3.3V-5V CMOS TTL level, with ESD protection
GPS1
SERIAL 4 / UART 4 / I2C 2
UART 4 / I2C 2, 3.3V-5V CMOS TTL level, with ESD protection
GPS2
SERIAL 5 / UART 5 (Debug Console)
UART 5，Debug Console
CONS
I2C 2
Independent I2C 2 port. Drivers are on-board on FMU. UN-buffered, and pulled up to 3.3V COMS TTL level
I2C2
CAN Bus
Standard CAN Bus. Drivers are on-board on FMU.
CAN1 CAN2 CAN3
R/C IN
Support CPPM / Futaba S.Bus signal input
RCIN
DSM / USART
Support Spektrum DSM® Technology, Spektrum DSM2™ / DSMX™ compatible input; I/O USART 1 RX
SKPT
S.Bus OUT / RSSI IN
S.Bus Servo I/O. PPM Output. Can be used as RSSI input
SBUSo
POWER
Main Power source and Backup Power source Input
POWER1 POWER2
MAIN OUT
Standard PWM Servo Signal I/O Port x 8
MAIN OUT
AUX OUT
Programmable FMU GPIO x 6. Support PWM Signal Output
AUX OUT
USB
Human Machine Interface (HMI): LED, Speaker and USB extension
USB
ADC
3.3 V ADC Input
ADC
SPI
Built-in SPI port, with NO buffer, can only use short cable for connection. Not recommended.
Built-in contact point
Debug
I/O and FMU Testing Port
Built-in port
ETH
Ethernet Port
DSI
MIPI DSI output and Timestamp,FMU/IO BOOT
This document covers the complete interface standard and core mechanical, electrical and external connection options of The Cube module series. Sections marked as LT (long term) are intended to be kept stable to isolate vehicle from autopilot revisions.
Connector Series
Low density: 0.1” over mould Futaba keyed servo connectors (Mfg. to be identified)
-Cabling: AWG24, ribbon or round, iconic colour scheme
Stack: Hirose DF17, 80pos , 4 mm stacking height, 0.5 mm pitch, drop-proof
High density: JST-GH 1.25 mm
-Cabling: AWG28, ribbon, iconic colour scheme
Power Module: Molex Clik-Mate 2 mm for both main and backup power
Mechanical: 30x30 mm M3 mounting hole pattern, 35x35 mm footprint
80 position DF17 connector. Carries all autopilot interface connections.
Minimal (read: really minimal) electrical protection
No power management（intergrade in Carrier board）
3.8 to 5.7V operation (absolute maximum ratings)
4.0 to 5.5V operation (compliant rating)
Total connectivity:
I2C * 2
CAN * 3
Serial * 5 : TELEM1, TELEM2, GPS (I2C 1 embedded), SERIAL4(I2C 2 embedded),
Serial 5 is used for the on-board ADSB-IN receiver that is featured on newer carrier boards
HMI * 1
TELEM1Pin #
Name
I/O
Voltage
Wire Colour
Definition
1
VCC_5V
OUT
5 V
RED/GRAY
VCC
2
SERIAL_1_TX
OUT
3.3 V - 5.0 V TTL
Orange+/BLACK
UART 1 TX (Transmit Data)
3
SERIAL_1_RX
IN
3.3 V - 5.0 V TTL
GREEN/BLACK
UART 1 RX (Receive Data)
4
SERIAL_1_CTS (TX)
OUT
3.3 V - 5.0 V TTL
GRAY/BLACK
UART 1 CTS (Clear To Send)
5
SERIAL_1_RTS (RX)
IN
3.3 V - 5.0 V TTL
GRAY/BLACK
UART 1 RTS (Request To Send)
6
GND
GND
BLACK
GND
GPS1Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VCC_5V
IN
5 V
RED
VCC Power Supply To GPS From AP
3
SERIAL_3_TX
OUT
3.3 V - 5.0 V TTL
BLACK
UART 3 TX (Transmit Data)
2
SERIAL_3_RX
IN
3.3 V - 5.0 V TTL
BLACK
UART 3 RX (Receive Data)
4
I2C_1_SCL
IN
3.3 V
BLACK
I2C 1 Clock Signal
5
I2C_1_SDA
IN/OUT
3.3 V
BLACK
I2C 1 Serial Data
6
BUTTON
GND
BLACK
Signal shorted to GND on press
7
IO_LED_SAFET_PROT
GND
BLACK
LED Driver For Safety Button
8
GND
GND
BLACK
GND
USBPin #
Name
I/O
Voltage
Cable Colour
Definition
1
V BUS
OUT
5 V
RED/GRAY
USB V BUS
2
OTG_DP1
IN/OUT
3.3 V
GREEN/BLACK
USB Data Positive (D+)
3
OTG_DM1
IN/OUT
3.3 V
RED/BLACK
USB Data Minus (D-)
4
GND
GND
BLACK
GND
5
BUZZER_OUT
OUT
Battery Voltage
GRAY/BLACK
VBAT (8.4 - 42 V)
6
FMU_LED_AMBER
OUT
BLACK
Boot / Error LED (FW updates)
I2C 2Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VCC_5V
OUT
5 V
RED/GRAY
VCC Power Supply
2
I2C_2_SCL
IN/OUT
3.3 V (PULLUPS)
BLUE/BLACK
I2C 2 Clock Signal, Pull-up on AP
3
I2C_2_SDA
IN/OUT
3.3 V (PULLUPS)
GREEN/BLACK
I2C 2 Serial Data, Pull-up on AP
4
GND
GND
BLACK
GND
CAN1Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VCC_5V
OUT
5 V
RED/GRAY
VCC Power Supply
2
CAN_H_1
IN/OUT
12 V
Orange+/BLACK
CAN High
3
CAN_L_1
IN/OUT
12 V
GREEN/BLACK
CAN Low
4
GND
GND
BLACK
GND
CAN 2 | Port: CAN2
Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VCC_5V
OUT
5 V
RED/GRAY
VCC Power Supply
2
CAN_H_2
IN/OUT
12 V
Orange+/BLACK
CAN High
3
CAN_L_2
IN/OUT
12 V
GREEN/BLACK
CAN Low
4
GND
GND
BLACK
GND
ADC | Port: ADC
Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VDD_5V_PRES
OUT
5 V
RED
Power Supply
2
PRESSURE_SENS_IN
IN
BLACK
3
GND
GND
BLACK
GND
IO USART 1 / DSM | Port: SPKT
Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
IO_USART1_RX_SPECTRUM_DSM
IN
IO USART 1 RX, DSM INPUT
2
GND
GND
GND
3
VDD_3V3_Spektrum
OUT
3.3 V
Independent Power Supply
SERIAL 5 / UART 5 (Debug Console) / S.Bus OUT | Port: CONS SBUSo
Pin #
Name
I/O
Voltage
Cable Colour
Definition
1 SBUSo
S.Bus_Out
OUT
S.Bus Signal Output
2 CONS
SERIAL_5_TX
OUT
3.3 V - 5.0 V TTL
UART 5 TX (Transmit Data)
3 SBUSo
VDD_SERVO
OUT
Servo Voltage
4 CONS
SERIAL_5_RX
IN
3.3 V - 5.0 V TTL
UART 5 RX (Receive Data)
5 SBUSo
GND
GND
GND
6 CONS
GND
GND
GND
Main Power POWER 1 | Port: POWER1
Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VDD_5V_BRICK
IN
5 V
RED/GRAY
Supply To AP from Power Brick
2
VDD_5V_BRICK
IN
5 V
RED/GRAY
Supply To AP from Power Brick
3
BATT_CURRENT_SENS_PROT
3.3 V
BLACK
Battery Current Connecter
4
BATT_CURRENT_VOLTAGE_PROT
IN
3.3 V
BLACK
Battery Voltage Connecter
5
GND
GND
BLACK
GND
6
GND
GND
BLACK
GND
Backup Power POWER 2 | Port: POWER2
Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VDD_5V_BRICK
IN
5 V
RED/GRAY
Supply To AP from Power Brick
2
VDD_5V_BRICK
IN
5 V
RED/GRAY
Supply To AP from Power Brick
3
AUX_BATT_CURRENT_SENS
3.3 V
BLACK
Aux Battery Current Connecter
4
AUX_BATT_VOLTAGE_SENS
IN
3.3 V
BLACK
Aux Battery Voltage Connecter
5
GND
GND
BLACK
GND Connection
6
GND
GND
BLACK
GND
CPPM / S.BUS / SERVO SYSTEM | Port: RCIN MAIN OUT AUX OUT
Pin #
Name
I/O
Voltage
Definition
S - 1
FMU_CH1_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 2
FMU_CH2_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 3
FMU_CH3_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 4
FMU_CH4_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 5
FMU_CH5_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 6
FMU_CH6_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 7
IO_CH1_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 8
IO_CH2_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 9
IO_CH3_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 10
IO_CH4_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 11
IO_CH5_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 12
IO_CH6_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 13
IO_CH7_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 14
IO_CH8_PROT
OUT
3.3 V Servo Signal, Servo Rail Power
PWM Signal
S - 15
PPM_SBUS_PROT
IN/OUT
3.3 V / 4.5 V Powered
PPM / S.Bus Signal
SERIAL 2 / UART 2 | Port: TELEM2
Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VCC_5V
OUT
5 V
RED/GRAY
VCC
2
SERIAL_2_TX
OUT
3.3 V - 5.0 V TTL
Orange+/BLACK
UART 2 TX (Transmit Data)
3
SERIAL_2_RX
IN
3.3 V - 5.0 V TTL
GREEN/BLACK
UART 2 RX (Receive Data)
4
SERIAL_2_CTS (TX)
OUT
3.3 V - 5.0 V TTL
GRAY/BLACK
UART 2 CTS (Clear To Send)
5
SERIAL_2_RTS (RX)
IN
3.3 V - 5.0 V TTL
GRAY/BLACK
UART 2 RTS (Request To Send)
6
GND
GND
BLACK
GND
SERIAL 4 / UART 4 / I2C 2 | Port: GPS2
Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VCC_5V
OUT
5 V
RED/GRAY
VCC Power Supply To GPS From AP
2
SERIAL_4_TX
OUT
3.3 V - 5.0 V TTL
Orange+/BLACK
UART 4 TX (Transmit Data)
3
SERIAL_4_RX
IN
3.3 V - 5.0 V TTL
GREEN/BLACK
UART 4 RX (Receive Data)
4
I2C_2_SCL
OUT
3.3 V - 5.0 V
GRAY/BLACK
I2C 2 Clock Signal
5
I2C_2_SDA
IN
3.3 V - 5.0 V
GRAY/BLACK
I2C 2 Serial Data
6
GND
GND
BLACK
GND
CAN 3 | Port: CAN3
Pin #
Name
I/O
Voltage
Cable Colour
Definition
1
VCC_5V
OUT
5 V
RED/GRAY
VCC Power Supply
2
CAN_H_2
IN/OUT
12 V
Orange+/BLACK
CAN High
3
CAN_L_2
IN/OUT
12 V
GREEN/BLACK
CAN Low
4
GND
GND
BLACK
GND
Ethernet: ETH1
Pin #
Name
I/O
Description
1
TXP/RXP
IN/OUT
Ethernet TXP/RXP Auto-MDIX support
2
TXN/RXN
IN/OUT
Ethernet TXN/RXN Auto-MDIX support
3
RXP/TXP
IN/OUT
Ethernet RXP/TXP Auto-MDIX support
4
NC
No connect
5
NC
No connect
6
RXN/TXN
IN/OUT
Ethernet RXN/TXN Auto-MDIX support
7
NC
No connect
8
NC
No connect
DSI / Timestamp / Boot| Port: DSI
Pin #
Name
I/O
Definition
1
IO_BOOT_0
OUT
IO BOOT
2
FMU_BOOT_0
OUT
FMU BOOT
3
TIMESTAMP_RTC
OUT
TIMESTAMP
4
GND
GND
5
DSI_CKP
OUT
MIPI DSI Host Clock Postive
6
DSI_CKN
OUT
MIPI DSI Host Clock Negative
7
GND
GND
8
DSI_D0P
OUT
MIPI DSI Host DATA 0 Postive
9
DSI_D0N
OUT
MIPI DSI Host DATA 0 Negative
10
GND
GND
11
DSI_D1P
OUT
MIPI DSI Host DATA 1 Postive
12
DSI_D1N
OUT
MIPI DSI Host DATA 1 Negative
13
GND
GND
14
IO_DAC
OUT
IO Analog output
15
FMU_DAC
OUT
FMU Analog output
The Cube continues with the FMU + IO architecture from the previous generation, incorporating the two functional blocks in a single physical module.
PWM Outputs
The Cube has eight PWM outputs that are connected to IO and can be controlled by IO directly via R/C input and on-board mixing even if FMU is not active (failsafe / manual mode). Multiple update rates can be supported on these outputs in three groups; one group of four and two groups of two. PWM signal rates up to 400Hz can be supported. These 8 PWM's are output ONLY and are capable of driving up to 50mA each, but only a total of 100mA for the 8.
Six PWM outputs are connected to FMU and feature reduced update latency. These outputs cannot be controlled by IO in failsafe conditions. Multiple update rates can be supported on these outputs in two groups; one group of four and one group of two.
PWM signal rates up to 400Hz can be supported.
All PWM outputs are EDS-protected, and they are designed to survive accidental miss-connection of servos without being damaged. The servo drivers are specified to drive a 50pF servo input load over 2m of 26AWG servo cable.
the I/O PWM outputs can also be configured as individual GPIOs. Note that these are not high-power outputs – the PWM drivers are designed for driving servos and similar logic inputs only, not relays or LEDs.
Peripheral Ports
All peripherals are connected through two 80 pin connectors, and the peripherals are connected via a baseboard that can be customized for each application
Base Board
The initial base board features separate connectors for each of the peripheral ports (with a few exceptions.
Five serial ports are provided. Serial 1 and 2 feature full flow control. Serial 3 is recommended as the GPS port and has the safety button and (possibly the safety led) as well as I2C for the compass and RGB LED. Serial 4 also has I2C, but on the second bus, thus allowing two compass modules to be connected at the same time. Serial 5 is available as a header underneath the board. Serial ports are 3.3V CMOS logic level, 5V tolerant, buffered and ESD-protected.
The SPI port is not buffered; it should only be used with short cable runs. Signals are 3.3V CMOS logic level, but 5V tolerant. SPI is only available to test points on the first base board, along with a CS and INT pin.
Analogue 1-3 are protected against inputs up to 12V, but scaled for 0-3.3V inputs. The RSSI input supports either PWM or analogue RSSI. This input shares a pin with S.Bus output - only one may be connected at a time.
CPPM, S.Bus and DSM/Spektrum input are unchanged from previous versions.
The CAN ports are standard CAN-Bus; termination for one end of the bus is fixed on- board. Drivers are on-board the FMU
The piezo port will drive most piezo elements in the 5 - 300nF range at up to 35V. it is intended to be extremely loud, with the achievable sound pressure level limited by the sensitivity of the piezo element being driven.
I2C is direct driven, un-buffered, and pulled up to *3.3v on-board* the FMU
Serial 5 is used for the on-board ADSB-IN receiver that is featured on newer carrier boards
Power management module (separate from the FMU)
Key features of The Cube power architecture:
Single, independent 5V supply for the flight controller and peripherals.
Integration with *2 power bricks* or compatible alternative, including current and voltage sensing.
Low power consumption and heat dissipation.
Power distribution and monitoring for peripheral devices.
Protection against common wiring faults; under/over-voltage protection, overcurrent protection, thermal protection.
Brown-out resilience and detection.
FMU and IO Power Supplies
Both FMU and IO operate at 3.3V, and each has its own private dual-channel regulator. As in The Cube , each regulator features a power-on reset output tied to the regulator’s internal power-up and drop-out sequencing.
Power Sources
Power may be supplied to The Cube via USB, via the power brick port, or the second brick port. Each power source is protected against reverse-polarity connections and back-powering from other sources.
Power Brick Port
The brick port is the preferred power source for Cube, and brick power will always be selected if it is available.
Servo Power
The Cube supports both standard (5V) and high-voltage (up to 10V) servo power with some restrictions.
IO will accept power from the servo connector up to 10V. This allows IO to failover to servo power in all cases if the main power supply is lost or interrupted.
FMU and peripherals will NOT accept power from the servo connector.
Aux Power
The Cube introduces a backup power port; this is set up the same as the primary power input.
At input voltages over 5.7V power is locked out.
The Cube and peripherals combined may draw up to 2.75A total when operating on Aux power, provided that the Brick or other power source can supply the required current.
Power is never supplied by The Cube to servos.
Servo rail
The I/O chip takes power up to 10.5v from the servo rail; this is used to revert to manual mode in the unfortunate event that the other two main sources of power fail. This is only useful for plane, and only useful if the I/O chip has been mapped correctly.
USB-Type C Power
Power from USB-Type C is supported for software update, testing and development purposes. USB-Type C power is supplied to the peripheral ports for testing purposes, however total current consumption must typically be limited to 3A, including peripherals, to avoid overloading the host USB port.
Multiple Power Sources
When more than one power source is connected, power will be drawn from the highest-priority source with a valid input voltage.
In most cases, FMU should be powered via the power brick or a compatible off board regulator via the brick port or auxiliary power rail.
In desktop testing scenarios, taking power from USB avoids the need for a BEC or similar servo power source (though servos themselves will still need external power).
Summary
For each of the components listed, the input voltage ranges over which the device can be powered from each input is shown.
Brick port
Aux port
USB port
Servo rail
FMU
4—5.7V
4—5.7V
4—5.7V
NIL
IO
4—5.7V
4—5.7V
4—5.7V
4 - 10.5V
Peripherals
4—5.7V
4—5.7V 2.5A max
4—5.7V 2.5A max
NIL
The Cube provides power routing, over/under voltage detection and protection, filtering, switching, current-limiting and transient suppression for peripherals. Power outputs to peripherals feature ESD and EMI filtering, and the power supply protection scheme ensures that no more than 5.5V is presented to peripheral devices.
Power is disconnected from the peripherals when the available supply voltage falls below 3.8V, or rises above approximately 5.7V.
Peripheral power is split into two groups:
Serial 1 (TELEM 1) has a private 1.5A current limit, intended for powering a low power. This output is separately EMI filtered and draws directly from the USB / Brick inputs. Peak power draw on this port should not exceed 1.5A, never power your telemetry from this port under any circumstance.
All other peripherals share a 1A current limit and a single power switch. Peak power draw on this port should not exceed 1.5A. Each group is individually switched under software control.
The Spektrum / DSM R/C interface draws power from its own regulator, rather than from either of the groups above. This port is switched under software control so that Spektrum / DSM binding can be implemented. Spektrum receivers generally draw ~25mA.
S.Bus and CPPM receivers are powered by a dedicated power supply. Please do not connect any servos to this power, only an RX by itself.
Capacitor Backup
Both the FMU and IO microcontrollers feature Capacitor-backed real-time clocks and SRAM. The on-board backup Capacitor has capacity sufficient for the intended use of the clock and SRAM, which is to provide storage to permit orderly recovery from unintended power loss or other causes of in-air restarts. The capacitors are recharged from the FMU 3.3V rail. this will only function in the event of software existing to support this feature.
Voltage, Current and Fault Sensing
The battery voltage and current reported by both bricks can be measured by the FMU. In addition, the 5V unregulated supply rail can be measured (to detect brown- out conditions). IO can measure the servo power rail voltage.
Over-current conditions on the peripheral power ports can be detected by the FMU. Hardware lock-out prevents damage due to persistent short-circuits on these ports. The lock- out can be reset by FMU software. The under/over voltage supervisor for FMU provides an output that is used to hold FMU in reset during brown-out events.
EMI Filtering and Transient Protection
(on the normal Base Board, must be specified for externally supplied base boards.）
EMI filtering is provided at key points in the system using high-insertion-loss pass- through filters. These filters are paired with TVS diodes at the peripheral connectors to suppress power transients.
Reverse polarity protection is provided at each of the power inputs. USB signals are filtered and terminated with a combined termination/TVS array.
Most digital peripheral signals (all PWM outputs, serial ports, I2C port) are driven using ESD-enhanced buffers and feature series blocking resistors to reduce the risk of damage due to transients or accidental misconnections.
Four set IMU's
One onboard compass
Three Barometers
Dual Power input
This removes the option of redundancy from the Servo rail and replaces it with a dedicated second power plug
A dedicated power protection Zener diode and Fet have been added to protect from voltages over 5.6v being applied to Aux input 2
This is only on the "PRO" carrier board mini carrier board still draws the backup from the servo rail.
Dual external I2C
This allows for connection of items to either I2C port, potentially allowing two GPS / Mag units to be plugged in without the Mags conflicting.
Power monitoring pins are now routed to the I/O chip, these will allow for the logging of power events during an inflight reboot.
2024-02-08
