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

SKR 3

硬件参数

• 微处理器：ARM Cortex-M7 STM32H743VI 480MHz 带 FDCAN 总线
• DCDC 5V 输出最大电流：5A, 峰值可达 6A
• 输入电压：DC12V-DC24V
• 逻辑电压：DC 3.3V
• 加热接口：热床（HB） 最大输出电流：10A，加热棒（ E0、 E1）最大输出电流：5.5A
• 热敏电阻端口带保护电路，避免因热床或者加热棒漏电 24V 电压接到热敏电阻端口导致主控芯片烧毁
• 热敏电阻可通过跳线选择上拉电阻值(1Kohm)，以此方式支持 PT1000，而不需外接模块，方便客户 DIY 使用(精度相比Max31865低很多)
• 风扇接口：三个数控风扇（FAN0， FAN1，FAN2），两个常开风扇端口，单个风扇最大输出电流：1A
• 数控风扇通过外插电源模块实现 24V、 12V、 5V 电压选择（ 注意： 3 个数控风扇的电压是统一的，无法单独设置为不同的电压），省去客户外接变压模块的操作
• 加热棒 + 驱动 + 风扇的总电流小于 10A
• WIFI 接口：ESP-12S、ESP-07S、ESP32U、ESP32E
• 拓展接口：BLTouch（Servos、Probe）、PS-ON、PWR-DET、Fil-DET、RGB、FDCAN
• 电机驱动：支持 TMC5160、TMC2209、TMC2225、TMC2226、TMC2208、TMC2130、ST820、LV8729、DRV8825、A4988 等，驱动工作模式支持 SPI、UART、STEP/DIR

固件支持

• 此产品支持 Marlin、 Klipper 和 RRF(RepRapFirmware)固件

Pin 脚说明

• SKR 3-PIN.pdf

SKR 3 EZ

硬件参数

• 热敏电阻可通过跳线选择上拉电阻值为(2.2Kohm， SKR 3 是 1Kohm, 2.2K搭配PT1000在我们工作的温度范围内，电压变化刻度更明显，相同的ADC精度下采集的温度比1K更准确些)，以此方式支持 PT1000.
• 逻辑电压：驱动信号线为DC 5V
• 所有电机驱动电压都是高低压可选的
• 电机驱动支持EZ系列的驱动
• 其他的所有参数与 SKR 3 相同

Pin 脚说明

• SKR 3 EZ-PIN.pdf

SKR 3 & SKR 3 EZ Pin 脚说明表

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:

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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