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review

　You can find a complete review with detailed features of our electronics in Spanish and English on 3dwork.io.

SKR 3

Hardware

• MCU: ARM Cortex-M7 STM32H743VI 480MHz with FDCAN bus
• DCDC 5V current output rated at 5A max continuous and 6A max instantaneous
• Voltage in: DC12V-DC24V
• Logic voltage: DC 3.3V
• Heated bed(HB) max current: 10A, heater cartridge(E0, E1) max current: 5.5A
• Thermistor circuit is protected to prevent MCU damage from shorted heatbed and heater cartridge connection
• Thermistor connection supports Pull up resistance value(1Kohm) setting using jumpers, No more extra module needed for PT1000(Accuracy is much lower than max31865)
• Fan port: 3 X CNC(selectable voltage), 2 X always on(PSU voltage), max current: 1A per port
• Selectable voltage (24V, 12V, 5V by SKR 3-DC MODE)for CNC fan (Note: The voltages of the 3 * CNC fans are unified, different voltages cannot be set separately for different ports), no more need for external stepdown
• Overall max current(HB+E0+E0+All fans): 10A
• WIFI: ESP-12S, ESP-07S, ESP32U, ESP32E
• Expansion port: BLTouch(Servos, Probe), PS-ON, PWR-DET, Fil-DET, RGB, FDCAN
• Stepper driver: TMC5160, TMC2209, TMC2225, TMC2226, TMC2208, TMC2130, ST820, LV8729, DRV8825, A4988 etc. Stepper driver mode: SPI, UART, STEP/DIR

Firmware

• Supported Firmware: Marlin, Klipper and RRF(RepRapFirmware)

Pinout

• SKR 3-PIN.pdf

SKR 3 EZ

Hardware

• Thermistor connection supports Pull up resistance value(2.2Kohm, SKR 3 use 1Kohm, Within our working temperature range, the voltage change scale of 2.2k with PT1000 is more obvious, and the temperature collected under the same ADC accuracy is more accurate than 1K) setting using jumpers, No more extra module needed for PT1000(Accuracy is much lower than max31865)
• Logic voltage: Stepper driver signal DC 5V
• High and low voltage can be selected for all stepper driver by jumper
• stepper driver support EZ Driver
• All other parameters are the same as SKR 3

Pinout

• SKR 3 EZ-PIN.pdf

SKR 3 & SKR 3 EZ Pinout table

Peripheral	Function	Pin name	Pin No.	Comment
X	STEP	PD4	85	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	DIR	PD3	84	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	EN	PD6	87	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	CS/UART	PD5	86
Y	STEP	PA15	77	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	DIR	PA8	67	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	EN	PD1	82	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	CS/UART	PD0	81
Z	STEP	PE2	1	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	DIR	PE3	2	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	EN	PE0	97	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	CS/UART	PE1	98
E0	STEP	PD15	62	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	DIR	PD14	61	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	EN	PC7	64	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	CS/UART	PC6	63
E1	STEP	PD11	58	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	DIR	PD10	57	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	EN	PD13	60	SKR 3 EZ is converted to 5V to driver (SKR 3 is MCU 3.3V)
	CS/UART	PD12	59
TMC SPI (Software SPI)	MISO	PE15	45
	MOSI	PE13	43
	SCK	PE14	44
Heater	E0	PB3	89	is converted to 5V to MOSFET with flyback protection
	E1	PB4	90	is converted to 5V to MOSFET with flyback protection
	HB(heated bed)	PD7	88	is converted to 5V to MOSFET with flyback protection
Temperature	TH0	PA2	24	4.7KOhm 0.1% pull up resistor for NTC100K,etc. 1KOhm(SKR 3) or 2.2KOhm(SKR 3 EZ) 0.1% pull up resistor for PT1000 by jumper. with thermistor protection circuit
	TH1	PA3	25	4.7KOhm 0.1% pull up resistor for NTC100K,etc. 1KOhm(SKR 3) or 2.2KOhm(SKR 3 EZ) 0.1% pull up resistor for PT1000 by jumper. with thermistor protection circuit
	THB	PA1	23	4.7KOhm 0.1% pull up resistor for NTC100K,etc. with thermistor protection circuit
Endstop	X-STOP	PC1	16	Share with X-DIAG
	Y-STOP	PC3	18	Share with Y-DIAG
	Z-STOP	PC0	15	Share with Z-DIAG
	E0-DET	PC2	17	Share with E0-DIAG
	E1-DET	PA0	22	Share with E1-DIAG
FAN	FAN0	PB7	93	is converted to 5V to MOSFET with flyback protection
	FAN1	PB6	92	is converted to 5V to MOSFET with flyback protection
	FAN2	PB5	91	is converted to 5V to MOSFET with flyback protection
Misc	PWRDET	PC15	9
	PS-ON	PE4	3
	RGB(Neopixel/WS2812)	PE6	5	is converted to 5V
BLTouch	SERVOS	PE5	4
	PROBE	PC13	7
TFT UART1	RX	PA10	69
	TX	PA9	68
FDCAN1	RX	PB8	95
	TX	PB9	96
USB-Device	OTG_FS_DM	PA11	70
	OTG_FS_DP	PA12	71
EXP1	5V	5V		Marlin: EXP1_01_PIN, Klipper: EXP1_10
	GND	GND		Marlin: EXP1_02_PIN, Klipper: EXP1_9
	LCD_D7	PE12	42	Marlin: EXP1_03_PIN, Klipper: EXP1_8
	LCD_D6	PE11	41	Marlin: EXP1_04_PIN, Klipper: EXP1_7
	LCD_D5	PE10	40	Marlin: EXP1_05_PIN, Klipper: EXP1_6
	LCD_D4	PE9	39	Marlin: EXP1_06_PIN, Klipper: EXP1_5
	LCD_RS	PE8	38	Marlin: EXP1_07_PIN, Klipper: EXP1_4
	LCD_EN	PB1	35	Marlin: EXP1_08_PIN, Klipper: EXP1_3
	BTN_ENC	PB0	34	Marlin: EXP1_09_PIN, Klipper: EXP1_2
	BEEPER	PC5	33	Marlin: EXP1_10_PIN, Klipper: EXP1_1
EXP2	NC	NC		Marlin: EXP2_01_PIN, Klipper: EXP2_10
	GND	GND		Marlin: EXP2_02_PIN, Klipper: EXP2_9
	RESET	RESET	14	Marlin: EXP2_03_PIN, Klipper: EXP2_8
	SD_DETECT	PC4	32	Marlin: EXP2_04_PIN, Klipper: EXP2_7
	MOSI	PA7	31	Marlin: EXP2_05_PIN, Klipper: EXP2_6
	BTN_EN2	PB2	36	Marlin: EXP2_06_PIN, Klipper: EXP2_5
	SD_SS	PA4	28	Marlin: EXP2_07_PIN, Klipper: EXP2_4
	BTN_EN1	PE7	37	Marlin: EXP2_08_PIN, Klipper: EXP2_3
	SCK	PA5	29	Marlin: EXP2_09_PIN, Klipper: EXP2_2
	MISO	PA6	30	Marlin: EXP2_10_PIN, Klipper: EXP2_1
OnboardSD(SDIO)	SDMMC1_CK	PC12	80
	SDMMC1_CMD	PD2	83
	SDMMC1_D0	PC8	65
	SDMMC1_D1	PC9	66
	SDMMC1_D2	PC10	78
	SDMMC1_D3	PC11	79
WIFI(ESP3D/RRF)	ESP-RST(espResetPin)	PC14	8
	ESP-IO0(espDataReadyPin)	PB10	46
	ESP-IO4(TfrReadyPin)	PB11	47
	ESP-RX(UART3)	PD8	55
	ESP-TX(UART3)	PD9	56
	ESP-CS	PB12	51
	ESP-MOSI	PB15	54
	ESP-MISO	PB14	53
	ESP-CLK	PB13	52
EEPROM(Software-I2C)	SCL	PA14	76
	SDA	PA13	72	Share with onboard status LED

Note

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How to contact:

If you have any technical issue,please don’t hesitate contact us:

• BIGTREETECH: service004@biqu3d.com

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• Official Site: https://bigtree-tech.com/

Purchase link:

• SKR 3: https://bit.ly/3NoMhPf
• SKR 3 EZ: https://bit.ly/3LqfB6M
• EZ Driver: https://bit.ly/39GaLVy