GD32F103 pinout

GD32F103 is a GigaDevice Arm Cortex-M3 microcontroller family. The package map, ordering code and memory layout determine how to connect and configure each device.

LQFP48 48 contacts

LQFP64

64 contacts Current package

LQFP100 100 contacts

GigaDevice · GD32F103Rx · 64 leads

768 KiB Flash · 96 KiB SRAM

LQFP64 pinout

LQFP64

Top view. Pin 1 is beside the corner mark. Numbers advance counterclockwise. Scroll the map to reach all contacts.

Selected pin details

40 · PC9

Bidirectional · GPIO

General-purpose port C, bit 9. See the package table for peripheral assignments and input tolerance.

GD32F103xx datasheet Rev. 3.3, Table 2-7

Electrical limits · Link to this pin

All 64 pins

Pin	Signal	Direction	Function
1	VBAT Supply input	Supply input	RTC and backup-domain supply. In a single-supply design, connect it to VDD with its own bypass capacitor.
2	PC13 Bidirectional	Bidirectional	General-purpose port C, bit 13. See the package table for peripheral assignments and input tolerance.
3	PC14 Bidirectional	Bidirectional	GPIO or low-speed external oscillator input (OSC32IN).
4	PC15 Bidirectional	Bidirectional	GPIO or low-speed external oscillator output (OSC32OUT).
5	OSCIN Input	Input	High-speed external oscillator input. The internal RC oscillator can start the processor without a crystal.
6	OSCOUT Output	Output	High-speed external crystal oscillator output.
7	NRST Bidirectional	Bidirectional	Active-low system reset. Route it to the probe for connection under reset.
8	PC0 Bidirectional	Bidirectional	General-purpose port C, bit 0. See the package table for peripheral assignments and input tolerance.
9	PC1 Bidirectional	Bidirectional	General-purpose port C, bit 1. See the package table for peripheral assignments and input tolerance.
10	PC2 Bidirectional	Bidirectional	General-purpose port C, bit 2. See the package table for peripheral assignments and input tolerance.
11	PC3 Bidirectional	Bidirectional	General-purpose port C, bit 3. See the package table for peripheral assignments and input tolerance.
12	VSSA Return	Return	Analog ground. Connect it to the ground plane shared with VSS.
13	VDDA Supply input	Supply input	Analog supply for the ADC, clock and reset circuitry. Feed it from the VDD supply and bypass it to VSSA.
14	PA0 Bidirectional	Bidirectional	General-purpose port A, bit 0. See the package table for peripheral assignments and input tolerance.
15	PA1 Bidirectional	Bidirectional	General-purpose port A, bit 1. See the package table for peripheral assignments and input tolerance.
16	PA2 Bidirectional	Bidirectional	General-purpose port A, bit 2. See the package table for peripheral assignments and input tolerance.
17	PA3 Bidirectional	Bidirectional	General-purpose port A, bit 3. See the package table for peripheral assignments and input tolerance.
18	VSS_4 Return	Return	Digital ground. Connect every VSS lead to the ground plane.
19	VDD_4 Supply input	Supply input	Digital supply. Connect every VDD lead and place a local 100 nF bypass at each supply pair.
20	PA4 Bidirectional	Bidirectional	GPIO and SPI0_NSS in the PA4–PA7 assignment.
21	PA5 Bidirectional	Bidirectional	GPIO and SPI0_SCK in the PA4–PA7 assignment.
22	PA6 Bidirectional	Bidirectional	GPIO and SPI0_MISO in the PA4–PA7 assignment.
23	PA7 Bidirectional	Bidirectional	GPIO and SPI0_MOSI in the PA4–PA7 assignment.
24	PC4 Bidirectional	Bidirectional	General-purpose port C, bit 4. See the package table for peripheral assignments and input tolerance.
25	PC5 Bidirectional	Bidirectional	General-purpose port C, bit 5. See the package table for peripheral assignments and input tolerance.
26	PB0 Bidirectional	Bidirectional	General-purpose port B, bit 0. See the package table for peripheral assignments and input tolerance.
27	PB1 Bidirectional	Bidirectional	General-purpose port B, bit 1. See the package table for peripheral assignments and input tolerance.
28	PB2 Bidirectional	Bidirectional	GPIO and BOOT1 strap. BOOT0 low selects main Flash regardless of BOOT1.
29	PB10 Bidirectional	Bidirectional	General-purpose port B, bit 10. See the package table for peripheral assignments and input tolerance.
30	PB11 Bidirectional	Bidirectional	General-purpose port B, bit 11. See the package table for peripheral assignments and input tolerance.
31	VSS_1 Return	Return	Digital ground. Connect every VSS lead to the ground plane.
32	VDD_1 Supply input	Supply input	Digital supply. Connect every VDD lead and place a local 100 nF bypass at each supply pair.
33	PB12 Bidirectional	Bidirectional	General-purpose port B, bit 12. See the package table for peripheral assignments and input tolerance.
34	PB13 Bidirectional	Bidirectional	General-purpose port B, bit 13. See the package table for peripheral assignments and input tolerance.
35	PB14 Bidirectional	Bidirectional	General-purpose port B, bit 14. See the package table for peripheral assignments and input tolerance.
36	PB15 Bidirectional	Bidirectional	General-purpose port B, bit 15. See the package table for peripheral assignments and input tolerance.
37	PC6 Bidirectional	Bidirectional	General-purpose port C, bit 6. See the package table for peripheral assignments and input tolerance.
38	PC7 Bidirectional	Bidirectional	General-purpose port C, bit 7. See the package table for peripheral assignments and input tolerance.
39	PC8 Bidirectional	Bidirectional	General-purpose port C, bit 8. See the package table for peripheral assignments and input tolerance.
40	PC9 Bidirectional	Bidirectional	General-purpose port C, bit 9. See the package table for peripheral assignments and input tolerance.
41	PA8 Bidirectional	Bidirectional	General-purpose port A, bit 8. See the package table for peripheral assignments and input tolerance.
42	PA9 Bidirectional	Bidirectional	GPIO and USART0 transmit. Select the USART0 assignment before driving the line as TX.
43	PA10 Bidirectional	Bidirectional	GPIO and USART0 receive. Select the USART0 assignment to receive on this line.
44	PA11 Bidirectional	Bidirectional	General-purpose port A, bit 11. See the package table for peripheral assignments and input tolerance.
45	PA12 Bidirectional	Bidirectional	General-purpose port A, bit 12. See the package table for peripheral assignments and input tolerance.
46	PA13 Bidirectional	Bidirectional	Serial Wire Debug data (SWDIO). Reserve this signal while using the debug port.
47	VSS_2 Return	Return	Digital ground. Connect every VSS lead to the ground plane.
48	VDD_2 Supply input	Supply input	Digital supply. Connect every VDD lead and place a local 100 nF bypass at each supply pair.
49	PA14 Input in SWD mode	Input in SWD mode	Serial Wire Debug clock (SWCLK). The probe drives this line.
50	PA15 Bidirectional	Bidirectional	General-purpose port A, bit 15. See the package table for peripheral assignments and input tolerance.
51	PC10 Bidirectional	Bidirectional	General-purpose port C, bit 10. See the package table for peripheral assignments and input tolerance.
52	PC11 Bidirectional	Bidirectional	General-purpose port C, bit 11. See the package table for peripheral assignments and input tolerance.
53	PC12 Bidirectional	Bidirectional	General-purpose port C, bit 12. See the package table for peripheral assignments and input tolerance.
54	PD2 Bidirectional	Bidirectional	General-purpose port D, bit 2. See the package table for peripheral assignments and input tolerance.
55	PB3 Bidirectional	Bidirectional	General-purpose port B, bit 3. See the package table for peripheral assignments and input tolerance.
56	PB4 Bidirectional	Bidirectional	General-purpose port B, bit 4. See the package table for peripheral assignments and input tolerance.
57	PB5 Bidirectional	Bidirectional	General-purpose port B, bit 5. See the package table for peripheral assignments and input tolerance.
58	PB6 Bidirectional	Bidirectional	GPIO and I2C0_SCL in the PB6/PB7 assignment.
59	PB7 Bidirectional	Bidirectional	GPIO and I2C0_SDA in the PB6/PB7 assignment.
60	BOOT0 Input	Input	Sampled at reset. Hold low for normal execution from main Flash.
61	PB8 Bidirectional	Bidirectional	General-purpose port B, bit 8. See the package table for peripheral assignments and input tolerance.
62	PB9 Bidirectional	Bidirectional	General-purpose port B, bit 9. See the package table for peripheral assignments and input tolerance.
63	VSS_3 Return	Return	Digital ground. Connect every VSS lead to the ground plane.
64	VDD_3 Supply input	Supply input	Digital supply. Connect every VDD lead and place a local 100 nF bypass at each supply pair.

Signal assignments

SWD

PA13 is SWDIO and PA14 is SWCLK. NRST lets a compatible probe connect while reset is asserted.

USART0 on PA9/PA10

PA9 transmits to the remote receiver. PA10 receives from the remote transmitter. Use the asynchronous two-wire mode for a basic console.

SPI0 on PA4–PA7

PA4 is NSS, PA5 is clock, PA6 is MISO and PA7 is MOSI. Match the peripheral’s clock polarity, phase, chip select and voltage before exchanging data.

I²C0 on PB6/PB7

PB6 is SCL and PB7 is SDA. Use open-drain operation and pull both lines to the common logic rail. Size the pull-ups for bus capacitance and rise time.

Electrical limits

Parameter	Limit	Conditions and source
Flash organization256 KiB code / 512 KiB data	256 KiB code / 512 KiB data	Flash is distinct from SRAM. Check the memory mapping before assigning linker regions. GD32F103xx datasheet Rev. 3.3, Table 2-2
Serial peripherals3 USART, 2 UART, 3 SPI, 2 I²C, 1 CAN, 1 USBD, 1 SDIO	3 USART, 2 UART, 3 SPI, 2 I²C, 1 CAN, 1 USBD, 1 SDIO	These are peripheral counts. Each interface assignment still depends on the available package pins. GD32F103xx datasheet Rev. 3.3, Table 2-2
ROM serial bootUSART0 or USART1	USART0 or USART1	USART0 uses PA9/PA10. For codes that support it, USART1 uses PA2/PA3. GD32F103xx datasheet Rev. 3.3, §3.4
VDD and VDDA2.6–3.6 V	2.6–3.6 V	Use the same source for the digital and analog rails. 3.3 V is the nominal test supply. GD32F103xx datasheet Rev. 3.3, Table 4-2
VBAT1.8–3.6 V	1.8–3.6 V	Backup-domain supply. Connect to VDD in the single-supply circuit. GD32F103xx datasheet Rev. 3.3, §3.3
Maximum HCLK108 MHz	108 MHz	Follow the clock-tree and bus prescaler limits separately. GD32F103xx datasheet Rev. 3.3, Table 4-3

Models and documents

Interactive maps cover LQFP48, LQFP64 and LQFP100. See Figures 2-3 and 2-7 of the datasheet for LQFP144 and QFN36. Match the suffix on the chip. Board headers and regulator connections depend on the PCB.

GD32F103R4T6: 16 KiB Flash · 6 KiB SRAM
GD32F103R6T6: 32 KiB Flash · 10 KiB SRAM
GD32F103R8T6: 64 KiB Flash · 20 KiB SRAM
GD32F103RBT6: 128 KiB Flash · 20 KiB SRAM
GD32F103RCT6: 256 KiB Flash · 48 KiB SRAM
GD32F103RDT6: 384 KiB Flash · 64 KiB SRAM
GD32F103RET6: 512 KiB Flash · 64 KiB SRAM
GD32F103RFT6: 768 KiB Flash · 96 KiB SRAM
GD32F103RGT6: 1024 KiB Flash · 96 KiB SRAM
GD32F103RIT6: 2048 KiB Flash · 96 KiB SRAM
GD32F103RKT6: 3072 KiB Flash · 96 KiB SRAM

GD32F103xx datasheet Rev. 3.3· Figures 2-4 to 2-6, pin tables 2-6 to 2-8, Figure 4-1 and ordering information.
GD32F10x user manual Rev. 2.9· Boot modes, GPIO alternate functions and serial-wire debug.
Source register· Document applicability, revisions and SHA-256 checksums.