APM32F103RBT6 from Geehy, in a LQFP-64(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VBAT	power_in	Backup battery supply, 1.8-3.6 V. Powers RTC, external 32 kHz oscillator, and backup registers when VDD is off.
2	PC13/TAMPER-RTC	bidirectional	GPIO PC13 with alternate TAMPER-RTC function. Powered from VBAT domain; weak drive (2 MHz, 30 pF max, cannot source current).
3	PC14/OSC32_IN	bidirectional	GPIO PC14 or 32.768 kHz LSE crystal input. Backup domain, weak drive.
4	PC15/OSC32_OUT	bidirectional	GPIO PC15 or 32.768 kHz LSE crystal output. Backup domain, weak drive.
5	OSC_IN/PD0	input	HSE crystal oscillator input (4-16 MHz) by default after reset; can be remapped to GPIO PD0.
6	OSC_OUT/PD1	output	HSE crystal oscillator output by default after reset; can be remapped to GPIO PD1.
7	NRST	bidirectional	Active-low bidirectional reset pin. Internal pull-up; drives low during internal reset events.
8	PC0	bidirectional	GPIO PC0; alt: ADC12_IN10.
9	PC1	bidirectional	GPIO PC1; alt: ADC12_IN11.
10	PC2	bidirectional	GPIO PC2; alt: ADC12_IN12.
11	PC3	bidirectional	GPIO PC3; alt: ADC12_IN13.
12	VSSA	power_in	Analog ground return for ADC, reset block, RC oscillator, and PLL analog section. Must connect to VSS.
13	VDDA	power_in	Analog supply, 2.4-3.6 V (must be ≥2.4 V when ADC is used). Must connect to VDD.
14	PA0/WKUP	bidirectional	GPIO PA0; alt: WKUP, USART2_CTS, ADC12_IN0, TMR2_CH1_ETR.
15	PA1	bidirectional	GPIO PA1; alt: USART2_RTS, ADC12_IN1, TMR2_CH2.
16	PA2	bidirectional	GPIO PA2; alt: USART2_TX, ADC12_IN2, TMR2_CH3.
17	PA3	bidirectional	GPIO PA3; alt: USART2_RX, ADC12_IN3, TMR2_CH4.
18	VSS_4	power_in	Digital ground.
19	VDD_4	power_in	Digital supply, 2.0-3.6 V.
20	PA4	bidirectional	GPIO PA4; alt: SPI1_NSS, USART2_CK, ADC12_IN4.
21	PA5	bidirectional	GPIO PA5; alt: SPI1_SCK, ADC12_IN5.
22	PA6	bidirectional	GPIO PA6; alt: SPI1_MISO, ADC12_IN6, TMR3_CH1, TMR1_BKIN (remap).
23	PA7	bidirectional	GPIO PA7; alt: SPI1_MOSI, ADC12_IN7, TMR3_CH2, TMR1_CH1N (remap).
24	PC4	bidirectional	GPIO PC4; alt: ADC12_IN14.
25	PC5	bidirectional	GPIO PC5; alt: ADC12_IN15.
26	PB0	bidirectional	GPIO PB0; alt: ADC12_IN8, TMR3_CH3, TMR1_CH2N (remap).
27	PB1	bidirectional	GPIO PB1; alt: ADC12_IN9, TMR3_CH4, TMR1_CH3N (remap).
28	PB2/BOOT1	bidirectional	GPIO PB2 or boot-mode select BOOT1 input (5 V tolerant).
29	PB10	bidirectional	GPIO PB10 (FT); alt: I2C2_SCL, I2C4_SCL, USART3_TX, TMR2_CH3 (remap).
30	PB11	bidirectional	GPIO PB11 (FT); alt: I2C2_SDA, I2C4_SDA, USART3_RX, TMR2_CH4 (remap).
31	VSS_1	power_in	Digital ground.
32	VDD_1	power_in	Digital supply, 2.0-3.6 V.
33	PB12	bidirectional	GPIO PB12 (FT); alt: SPI2_NSS, I2C2_SMBAI, USART3_CK, TMR1_BKIN.
34	PB13	bidirectional	GPIO PB13 (FT); alt: SPI2_SCK, USART3_CTS, TMR1_CH1N, QSPI_IO0.
35	PB14	bidirectional	GPIO PB14 (FT); alt: SPI2_MISO, USART3_RTS, TMR1_CH2N, QSPI_IO1.
36	PB15	bidirectional	GPIO PB15 (FT); alt: SPI2_MOSI, TMR1_CH3N, QSPI_IO2.
37	PC6	bidirectional	GPIO PC6 (FT); alt: TMR3_CH1 (remap).
38	PC7	bidirectional	GPIO PC7 (FT); alt: TMR3_CH2 (remap).
39	PC8	bidirectional	GPIO PC8 (FT); alt: TMR3_CH3 (remap).
40	PC9	bidirectional	GPIO PC9 (FT); alt: TMR3_CH4 (remap).
41	PA8	bidirectional	GPIO PA8 (FT); alt: USART1_CK, TMR1_CH1, MCO.
42	PA9	bidirectional	GPIO PA9 (FT); alt: USART1_TX, TMR1_CH2.
43	PA10	bidirectional	GPIO PA10 (FT); alt: USART1_RX, TMR1_CH3.
44	PA11	bidirectional	GPIO PA11 (FT); alt: USART1_CTS, USBD1_DM, USBD2_DM, CAN_RX, TMR1_CH4.
45	PA12	bidirectional	GPIO PA12 (FT); alt: USART1_RTS, USBD1_DP, USBD2_DP, CAN_TX, TMR1_ETR.
46	PA13/JTMS/SWDIO	bidirectional	JTAG TMS / SWD IO after reset; can be released to GPIO PA13 (FT).
47	VSS_2	power_in	Digital ground.
48	VDD_2	power_in	Digital supply, 2.0-3.6 V.
49	PA14/JTCK/SWCLK	bidirectional	JTAG TCK / SWD CLK after reset; can be released to GPIO PA14 (FT).
50	PA15/JTDI	bidirectional	JTAG TDI after reset; alt: TMR2_CH1_ETR (remap), SPI1_NSS (remap); usable as GPIO PA15 when JTAG released.
51	PC10	bidirectional	GPIO PC10 (FT); alt: USART3_TX (remap).
52	PC11	bidirectional	GPIO PC11 (FT); alt: USART3_RX (remap).
53	PC12	bidirectional	GPIO PC12 (FT); alt: USART3_CK (remap).
54	PD2	bidirectional	GPIO PD2 (FT); alt: TMR3_ETR.
55	PB3/JTDO	bidirectional	JTAG TDO after reset; alt: TRACESWO, TMR2_CH2, SPI1_SCK; usable as GPIO PB3 (FT) when JTAG released.
56	PB4/NJTRST	bidirectional	JTAG NJTRST after reset; alt: TMR3_CH1 (remap), SPI1_MISO (remap); usable as GPIO PB4 (FT) when JTAG released.
57	PB5	bidirectional	GPIO PB5 (not 5V tolerant); alt: I2C1_SMBAI, TMR3_CH2 (remap), SPI1_MOSI (remap).
58	PB6	bidirectional	GPIO PB6 (FT); alt: I2C1_SCL, I2C3_SCL, TMR4_CH1, USART1_TX (remap).
59	PB7	bidirectional	GPIO PB7 (FT); alt: I2C1_SDA, I2C3_SDA, TMR4_CH2, USART1_RX (remap).
60	BOOT0	input	Boot-mode select input sampled at reset; picks boot source (user flash, system memory, or SRAM) together with BOOT1.
61	PB8	bidirectional	GPIO PB8 (FT); alt: TMR4_CH3, I2C1_SCL (remap), I2C3_SCL (remap), CAN_RX (remap).
62	PB9	bidirectional	GPIO PB9 (FT); alt: TMR4_CH4, I2C1_SDA (remap), I2C3_SDA (remap), CAN_TX (remap).
63	VSS_3	power_in	Digital ground.
64	VDD_3	power_in	Digital supply, 2.0-3.6 V.

Key specifications

Parameter	Value
Manufacturer	Geehy
Package	LQFP-64(10x10)
Category	MCU
Pins	64

Ordering variants

APM32F103RBT6
APM32F103RBT6-R
APM32F103RBT6APM32F103RBT7
APM32F103RBT6APM32F103RBT7-R
APM32F103RBT6APM32F103VBT6
APM32F103RBT6APM32F103VBT7
APM32F103RBT6APM32F103CBT6
APM32F103RBT6APM32F103CBT6-R
APM32F103RBT6APM32F103CBT7
APM32F103RBT6APM32F103CBT7-R
APM32F103RBT6APM32F103TBU6
APM32F103RBT6APM32F103TBU6-R
APM32F103RBT6APM32F103TBU7
APM32F103RBT6APM32F103TBU7-R

CAD (KiCad official)

Symbol: APM32F103RBT6
Footprint: Package_QFP:LQFP-64_10x10mm_P0.5mm
3D model: LQFP-64(10x10) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`apm32f103rbt6.step`	847 KB	You want the bare part, or you mark your own boards.
`apm32f103rbt6-etched.step`	5.6 MB	You want the part with `APM32F103RBT6` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 1406 faces against 995 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Geehy datasheet (85 pp, sha256 8c9a2ab3889a585a, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF