Name	总线通信开发板 (Bus Communication Development Board)
Part	Unknown
Brand	Unknown
Origin	China

Part	STM32F105RCT6
Manufacturer	ST-Microelectronics
Core	Arm Cortex-M3
Max. Clock Speed	72MHz
Package	UFQFPN 64 pins

FLASH	256KiB
SRAM	64KiB

HSI	8MHz
LSI	40kHz
HSE	8MHz
LSE	32.768kHz

Sources	Any +3.3V pin (+3.3V) Any +5V pin (+5V) USB connector (+5V)
VDDA pin	No
VSSA pin	No
VREF- pin	No
VREF+ pin	No
Backup battery	None

Manufacturer	Advanced Monolithic Systems Inc.
Part	AMS1117 (AMS1117)
Package	SOT223 3 pins
Input	+4.6V to +15V
Output	+3.3V @ 1A
Datasheet	AMS1117.pdf

Color	Green
Size (w x l)	50mm x 99mm
Mounting	4x mounting hole (M3)

• Warning: The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time.

• Perspective view
• Top view
• Bottom view

Name	复位 (Reset)
Reference	S1
Type	Button
Connected to	NRST
Mode	Active low

Name	-
Reference	-
Type	2-way jumper
Connected to	BOOT0
Mode	N.A.

Name	-
Reference	-
Type	2-way jumper
Connected to	PB2
Mode	N.A.

Name	按键1
Reference	-
Type	Button
Connected to	PB14
Mode	Active low

Name	按键2
Reference	-
Type	Button
Connected to	PB15
Mode	Active low

Name	-
Reference	D1
Type	LED
Connected to	+3.3V rail
Mode	N.A.

Name	-
Reference	D2
Type	LED
Connected to	PC0
Mode	Sink

Name	-
Reference	D3
Type	LED
Connected to	PC1
Mode	Sink

Name	Unknown
Reference	None
Type	Pin header (2.54mm, 13x2, male)

#	Name	Function	Connected to
1	5V	-	+5V rail
2	GND	-	Ground plane
3	3V3	-	+3.3V rail
4	GND	-	Ground plane
5	C2	-	PC2
6	C3	-	PC3
7	A0	-	PA0
8	A1	-	PA1
9	A2	-	PA2
10	A3	-	PA3
11	A4	-	PA4
12	A5	-	PA5
13	A6	-	PA6
14	A7	-	PA7
15	C4	-	PC4
16	C5	-	PC5
17	B0	-	PB0
18	B1	-	PB1
19	B10	-	PB10
20	B11	-	PB11
21	B14	-	PB14
22	B15	-	PB15
23	C6	-	PC6
24	C7	-	PC7
25	GND	-	Ground plane
26	3V3	-	+3.3V rail

Name	Unknown
Reference	None
Type	Pin header (2.54mm, 13x2, male)

#	Name	Function	Connected to
1	5V	-	+5V rail
2	GND	-	Ground plane
3	3V3	-	+3.3V rail
4	GND	-	Ground plane
5	C1	-	PC1
6	C0	-	PC0
7	C15	-	PC15
8	C14	-	PC14
9	C13	-	PC13
10	B7	-	PB7
11	B6	-	PB6
12	B5	-	PB5
13	B4	-	PB4
14	B3	-	PB3
15	D2	-	PD2
16	C12	-	PC12
17	C11	-	PC11
18	C10	-	PC10
19	A15	-	PA15
20	A8	-	PA8
21	A9	-	PA9
22	A10	-	PA10
23	C9	-	PC9
24	C8	-	PC8
25	3V3	-	+3.3V rail
26	GND	-	Ground plane

Name	Unknown
Reference	None
Type	USB Mini

#	Name	Function	Connected to
1	-	VCC	+5V rail
2	-	D-	PB11
3	-	D+	PB12 via jumper J1
4	-	ID	N.C.
5	-	GND	Ground plane

Name	Unknown
Reference	None
Type	IDC (2.54mm, 10x2, male)

#	Name	Function	Connected to
1	-	VCC	+3.3V rail
2	-	VCC	+3.3V rail
3	-	TRST	PB4
4	-	GND	Ground plane
5	-	TDI	PA15
6	-	GND	Ground plane
7	-	TMS / SWDIO	PA13
8	-	GND	Ground plane
9	-	TCLK / SWCLK	PA14
10	-	GND	Ground plane
11	-	RTCK	N.C.
12	-	GND	Ground plane
13	-	TDO / SWO	PB3
14	-	GND	Ground plane
15	-	RESET	NRST
16	-	GND	Ground plane
17	-	N.C.	N.C.
18	-	GND	Ground plane
19	-	N.C.	N.C.
20	-	GND	Ground plane

Name	Unknown
Reference	None
Type	pin header (2.54mm, 5x1, male)

#	Name	Function	Connected to
1	3V3	VCC	+3.3V rail
2	SWD	SWDIO	PA13
3	SWC	SWCLK	PA14
4	RST	RST	NRST
5	GND	GND	Ground plane

Name	串口1
Reference	None
Type	Pin header (2.54mm, 4x1, male)

#	Name	Function	Connected to
1	TXD	-	PA9
2	RXD	-	PA10
3	3V3	-	+3.3V rail
4	GND	-	Ground plane

Name	串口2
Reference	None
Type	Pin header (2.54mm, 4x1, male)

#	Name	Function	Connected to
1	TXD	-	PA2
2	RXD	-	PA3
3	3V3	-	+3.3V rail
4	GND	-	Ground plane

Name	串口3
Reference	None
Type	Pin header (2.54mm, 4x1, male)

#	Name	Function	Connected to
1	TXD	-	PB10
2	RXD	-	PB11
3	3V3	-	+3.3V rail
4	GND	-	Ground plane

Name	串口4
Reference	None
Type	Pin header (2.54mm, 4x1, male)

#	Name	Function	Connected to
1	TXD	-	PC10
2	RXD	-	PC11
3	3V3	-	+3.3V rail
4	GND	-	Ground plane

Name	串口5
Reference	None
Type	Pin header (2.54mm, 4x1, male)

#	Name	Function	Connected to
1	TXD	-	PC12
2	RXD	-	PD2
3	3V3	-	+3.3V rail
4	GND	-	Ground plane

Name	Unknown
Reference	None
Type	Pin header (2.54mm, 5x2, male)

#	Name	Function	Connected to
1	5V	-	+5V rail
2	GND	-	Ground plane
3	5V	-	+5V rail
4	GND	-	Ground plane
5	5V	-	+5V rail
6	GND	-	Ground plane
7	5V	-	+5V rail
8	GND	-	Ground plane
9	5V	-	+5V rail
10	GND	-	Ground plane

Name	Unknown
Reference	None
Type	Pin header (2.54mm, 5x2, male)

#	Name	Function	Connected to
1	3V3	-	+3.3V rail
2	GND	-	Ground plane
3	3V3	-	+3.3V rail
4	GND	-	Ground plane
5	3V3	-	+3.3V rail
6	GND	-	Ground plane
7	3V3	-	+3.3V rail
8	GND	-	Ground plane
9	3V3	-	+3.3V rail
10	GND	-	Ground plane

Name	Unknown
Reference	P13
Type	HT508K (5.08mm, 2x1, female)

#	Name	Function	Connected to
1	485-B	-	Pin 6 of U3
2	485-A	-	Pin 7 of U3

Name	Unknown
Reference	P14
Type	HT508K (5.08mm, 2x1, female)

#	Name	Function	Connected to
1	CAN1-H	-	Pin 7 of U4
2	CAN1-L	-	Pin 6 of U4

Name	Unknown
Reference	P15
Type	HT508K (5.08mm, 2x1, female)

#	Name	Function	Connected to
1	CAN2-H	-	Pin 7 of U5
2	CAN2-L	-	Pin 6 of U5

Name	Unknown
Reference	U3
Manufacturer	Maxim Integrated
Part	MAX3485
Marking	MAX3485
Datasheet	MAX3483-MAX3491.pdf
Package	SOIC 8 pins
Description	RS-485/RS-422 transceiver

#	Name	Function	Connected to
1	-	RO	PB11
2	-	RE	PB1
3	-	DE	PB0
4	-	DI	PB10
5	-	GND	Ground plane
6	-	A	Pin 1 of P13
7	-	B	Pin 2 of P13
8	-	VCC	+3.3V rail

Name	Unknown
Reference	U4
Manufacturer	NXP
Part	TJA1050
Marking	A1050/0
Datasheet	TJA1050.pdf
Package	SOIC 8 pins
Description	CAN transceiver

#	Name	Function	Connected to
1	-	TXD	PB8
2	-	GND	Ground plane
3	-	VCC	+3.3V rail
4	-	RXD	PB9
5	-	VREF	Ground plane via C17
6	-	CANL	Pin 2 of P14
7	-	CANH	Pin 1 of P14
8	-	S	Ground plane

Name	Unknown
Reference	U5
Manufacturer	NXP
Part	TJA1050
Marking	A1050/0
Datasheet	TJA1050.pdf
Package	SOIC 8 pins
Description	CAN transceiver

#	Name	Function	Connected to
1	-	TXD	PB12
2	-	GND	Ground plane
3	-	VCC	+3.3V rail
4	-	RXD	PB13
5	-	VREF	Ground plane via C18
6	-	CANL	Pin 2 of P15
7	-	CANH	Pin 1 of P15
8	-	S	Ground plane