APM32F051C8T6 from Geehy, in a LQFP-48(7x7). 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 domain supply (1.65-3.6 V). Powers the RTC and backup registers when VDD is absent.
2	PC13	bidirectional	General-purpose 3.3 V I/O (TC). Additional functions: RTC_TAMP1, RTC_TS, RTC_OUT, WKUP2. Powered from the VBAT switch, so drive strength is limited (≤2 MHz at 30 pF).
3	PC14/OSC32_IN	bidirectional	Low-speed 32.768 kHz oscillator input, or standard 3.3 V I/O (TC). Limited drive strength when used as GPIO.
4	PC15/OSC32_OUT	bidirectional	Low-speed 32.768 kHz oscillator output, or standard 3.3 V I/O (TC). Limited drive strength when used as GPIO.
5	PF0/OSC_IN	bidirectional	High-speed 4-32 MHz oscillator input, or 5 V-tolerant GPIO.
6	PF1/OSC_OUT	bidirectional	High-speed oscillator output, or 5 V-tolerant GPIO.
7	NRST	bidirectional	Bidirectional device reset (active low) with internal weak pull-up. Drives low during internal reset; may be pulled low externally to reset the device.
8	VSSA	power_in	Analog ground reference for the ADC, DAC, comparators and internal reference.
9	VDDA	power_in	Analog supply (2.4-3.6 V), independent of VDD, feeding the ADC, DAC, comparators and voltage reference.
10	PA0	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: USART2_CTS, TMR2_CH1_ETR, COMP1_OUT, TSC_G1_IO1. Additional: ADC_IN0, COMP1_INM6, RTC_TAMP2, WKUP1.
11	PA1	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: USART2_RTS, TMR2_CH2, TSC_G1_IO2, EVENTOUT. Additional: ADC_IN1, COMP1_INP.
12	PA2	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: USART2_TX, TMR2_CH3, TMR15_CH1, COMP2_OUT, TSC_G1_IO3. Additional: ADC_IN2, COMP2_INM6.
13	PA3	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: USART2_RX, TMR2_CH4, TMR15_CH2, TSC_G1_IO4. Additional: ADC_IN3, COMP2_INP.
14	PA4	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: SPI1_NSS, I2S1_WS, USART2_CK, TMR14_CH1, TSC_G2_IO1. Additional: ADC_IN4, COMP1/2_INM4, DAC_OUT1.
15	PA5	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: SPI1_SCK, I2S1_CK, CEC, TMR2_CH1_ETR, TSC_G2_IO2. Additional: ADC_IN5, COMP1/2_INM5.
16	PA6	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: SPI1_MISO, I2S1_MCK, TMR3_CH1, TMR1_BKIN, TMR16_CH1, COMP1_OUT, TSC_G2_IO3, EVENTOUT. Additional: ADC_IN6.
17	PA7	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: SPI1_MOSI, I2S1_SD, TMR3_CH2, TMR14_CH1, TMR1_CH1N, TMR17_CH1, COMP2_OUT, TSC_G2_IO4, EVENTOUT. Additional: ADC_IN7.
18	PB0	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: TMR3_CH3, TMR1_CH2N, TSC_G3_IO2, EVENTOUT. Additional: ADC_IN8.
19	PB1	bidirectional	3.3 V I/O directly connected to ADC (TTa). Alt: TMR3_CH4, TMR14_CH1, TMR1_CH3N, TSC_G3_IO3. Additional: ADC_IN9.
20	PB2	bidirectional	5 V-tolerant I/O (FT). Alt: TSC_G3_IO4.
21	PB10	bidirectional	5 V-tolerant I/O (FT). Alt: I2C2_SCL, CEC, TMR2_CH3, TSC_SYNC.
22	PB11	bidirectional	5 V-tolerant I/O (FT). Alt: I2C2_SDA, TMR2_CH4, TSC_G6_IO1, EVENTOUT.
23	VSS	power_in	Digital ground.
24	VDD	power_in	Digital supply (2.0-3.6 V).
25	PB12	bidirectional	5 V-tolerant I/O (FT). Alt: SPI2_NSS, TMR1_BKIN, TSC_G6_IO2, EVENTOUT.
26	PB13	bidirectional	5 V-tolerant I/O (FT). Alt: SPI2_SCK, TMR1_CH1N, TSC_G6_IO3.
27	PB14	bidirectional	5 V-tolerant I/O (FT). Alt: SPI2_MISO, TMR1_CH2N, TMR15_CH1, TSC_G6_IO4.
28	PB15	bidirectional	5 V-tolerant I/O (FT). Alt: SPI2_MOSI, TMR1_CH3N, TMR15_CH1N, TMR15_CH2. Additional: RTC_REFIN.
29	PA8	bidirectional	5 V-tolerant I/O (FT). Alt: USART1_CK, TMR1_CH1, EVENTOUT, MCO.
30	PA9	bidirectional	5 V-tolerant I/O (FT). Alt: USART1_TX, TMR1_CH2, TMR15_BKIN, TSC_G4_IO1.
31	PA10	bidirectional	5 V-tolerant I/O (FT). Alt: USART1_RX, TMR1_CH3, TMR17_BKIN, TSC_G4_IO2.
32	PA11	bidirectional	5 V-tolerant I/O (FT). Alt: USART1_CTS, TMR1_CH4, COMP1_OUT, TSC_G4_IO3, EVENTOUT.
33	PA12	bidirectional	5 V-tolerant I/O (FT). Alt: USART1_RTS, TMR1_ETR, COMP2_OUT, TSC_G4_IO4, EVENTOUT.
34	PA13/SWDIO	bidirectional	5 V-tolerant I/O (FT). Default after reset: SWDIO with internal pull-up. Alt: IR_OUT, SWDIO.
35	PF6	bidirectional	5 V-tolerant I/O (FT). Alt: I2C2_SCL.
36	PF7	bidirectional	5 V-tolerant I/O (FT). Alt: I2C2_SDA.
37	PA14/SWCLK	bidirectional	5 V-tolerant I/O (FT). Default after reset: SWCLK with internal pull-down. Alt: USART2_TX, SWCLK.
38	PA15	bidirectional	5 V-tolerant I/O (FT). Alt: SPI1_NSS, I2S1_WS, USART2_RX, TMR2_CH1_ETR, EVENTOUT.
39	PB3	bidirectional	5 V-tolerant I/O (FT). Alt: SPI1_SCK, I2S1_CK, TMR2_CH2, TSC_G5_IO1, EVENTOUT.
40	PB4	bidirectional	5 V-tolerant I/O (FT). Alt: SPI1_MISO, I2S1_MCK, TMR3_CH1, TSC_G5_IO2, EVENTOUT.
41	PB5	bidirectional	5 V-tolerant I/O (FT). Alt: SPI1_MOSI, I2S1_SD, I2C1_SMBA, TMR16_BKIN, TMR3_CH2.
42	PB6	bidirectional	5 V-tolerant Fast-Mode+ I/O (FTf). Alt: I2C1_SCL, USART1_TX, TMR16_CH1N, TSC_G5_IO3. Supports FM+ 1 Mbit/s I2C.
43	PB7	bidirectional	5 V-tolerant Fast-Mode+ I/O (FTf). Alt: I2C1_SDA, USART1_RX, TMR17_CH1N, TSC_G5_IO4. Supports FM+ 1 Mbit/s I2C.
44	BOOT0	input	Boot mode selection input. Sampled at reset to choose boot-from-flash, system memory (bootloader) or SRAM.
45	PB8	bidirectional	5 V-tolerant Fast-Mode+ I/O (FTf). Alt: I2C1_SCL, CEC, TMR16_CH1, TSC_SYNC.
46	PB9	bidirectional	5 V-tolerant Fast-Mode+ I/O (FTf). Alt: I2C1_SDA, IR_OUT, TMR17_CH1, EVENTOUT.
47	VSS	power_in	Digital ground.
48	VDD	power_in	Digital supply (2.0-3.6 V).

Key specifications

Parameter	Value
Manufacturer	Geehy
Package	LQFP-48(7x7)
Category	MCU
Pins	48

Ordering variants

Same part, different packaging or reel option.

APM32F051C8T6C6T6
APM32F051C8T6
APM32F051C8T6C6U6
APM32F051C8T6C8U6
APM32F051C8T6R6T6
APM32F051C8T6R8T6
APM32F051C8T6K6T6
APM32F051C8T6K8T6
APM32F051C8T6K6U6
APM32F051C8T6K8U6

CAD (KiCad official)

Symbol: APM32F051C8T6
Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
3D model: LQFP-48(7x7) (KiCad packages3D, STEP)

Provenance

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

Datasheet: Geehy datasheet (72 pp, sha256 4c3e595c7482399e, 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