Part: STM32F446xx — STMicroelectronics

Type: ARM Cortex-M4 MCU

Description: 32-bit ARM Cortex-M4 CPU with FPU operating at up to 180 MHz, featuring up to 512 KB Flash, 128 KB SRAM, USB OTG HS/FS, 17 timers, 3 ADCs, and 20 communication interfaces.

Operating Conditions:

• Supply voltage: 1.7 V to 3.6 V
• Operating temperature: -40 to +105 °C
• Max CPU frequency: 180 MHz

Absolute Maximum Ratings:

• Max supply voltage: null
• Max continuous current: null
• Max junction/storage temperature: null

Key Specs:

• Core: ARM 32-bit Cortex-M4 CPU with FPU
• Max CPU frequency: 180 MHz
• Flash memory: Up to 512 KB
• SRAM: 128 KB
• Backup SRAM: Up to 4 KB
• ADC: 3x 12-bit, 2.4 MSPS (up to 7.2 MSPS in triple interleaved mode)
• DAC: 2x 12-bit
• DMIPS: 225 DMIPS / 1.25 DMIPS/MHz (Dhrystone 2.1)
• I/O ports: Up to 114 with interrupt capability, up to 112 5 V-tolerant

Features:

• Adaptive real-time accelerator (ART Accelerator™)
• Flexible external memory controller (SRAM, PSRAM, SDRAM/LPSDR SDRAM, Flash NOR/NAND)
• Dual mode Quad SPI interface
• LCD parallel interface, 8080/6800 modes
• USB 2.0 full-speed device/host/OTG controller with on-chip PHY
• USB 2.0 high-speed/full-speed device/host/OTG controller with dedicated DMA, on-chip full-speed PHY and ULPI
• 8- to 14-bit parallel camera interface up to 54 Mbytes/s
• Low-power modes: Sleep, Stop, Standby
• Debug interfaces: SWD & JTAG, Cortex-M4 Trace Macrocell™

Applications:

• Motor drive and application control
• Medical equipment
• Industrial applications: PLC, inverters, circuit breakers
• Printers, and scanners
• Alarm systems, video intercom, and HVAC
• Home audio appliances

Package:

• LQFP64 (64 pins)
• LQFP100 (100 pins)
• LQFP144 (144 pins)
• WLCSP81 (81 balls)
• UFBGA144 (144 balls)

• Core: ARM ® 32-bit Cortex ® -M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™) allowing 0-wait state execution from Fl ash memory, frequency up to 180 MHz, MPU, 225 DMIPS/1.25 DMIPS/MHz (Dhrystone 2.1), and DSP instructions
• Memories
• -512 kB of Flash memory
• -128 KB of SRAM
• -Flexible external memory controller with up to 16-bit data bus: SRAM,PSRAM,SDRAM/LPSDR SDRAM, Flash NOR/NAND memories
• -Dual mode Quad SPI interface
• LCD parallel interface, 8080/6800 modes
• Clock, reset and supply management
• -1.7 V to 3.6 V application supply and I/Os
• -POR, PDR, PVD and BOR
• -4-to-26 MHz crystal oscillator
• -Internal 16 MHz factory-trimmed RC (1% accuracy)
• -32 kHz oscillator for RTC with calibration
• -Internal 32 kHz RC with calibration
• Low power
• -Sleep, Stop and Standby modes
• -VBAT supply for RTC, 20×32 bit backup registers + optional 4 KB backup SRAM
• 3×12-bit, 2.4 MSPS ADC: up to 24 channels and 7.2 MSPS in triple interleaved mode
• 2×12-bit D/A converters
• General-purpose DMA: 16-stream DMA controller with FIFOs and burst support
• Up to 17 timers: 2x watchdog, 1x SysTick timer and up to twelve 16-bit and two 32-bit timers up to 180 MHz, each with up to 4 IC/OC/PWM or pulse counter
• Debug mode
• -SWD & JTAG interfaces
• -Cortex ® -M4 Trace Macrocell™

Reference	Part number
STM32F446xx	STM32F446MC, STM32F446ME, STM32F446RC, STM32F446RE, STM32F446VC, STM32F446VE, STM32F446ZC, STM32F446ZE.

DocID026062 Rev 4

STM32F446RET6 – 64-LQFP Pinout

Pin	Name	Type	Description / Alternate Functions
1	VBAT	S	Battery supply
2	PC13	I/O	General-purpose I/O
3	PC14-OSC32_IN	I	32 kHz oscillator input
4	PC15-OSC32_OUT	O	32 kHz oscillator output
5	PH0-OSC_IN	I	Main oscillator input
6	PH1-OSC_OUT	O	Main oscillator output
7	NRST	RST	Reset pin (bidirectional, weak pull-up)
8	PC0	I/O	General-purpose I/O
9	PC1	I/O	General-purpose I/O
10	PC2	I/O	General-purpose I/O
11	PC3	I/O	General-purpose I/O
12	VSSA/VREF-	S	Analog ground / Reference ground
13	VDDA/VREF+	S	Analog supply / Reference supply
14	PA0	I/O	General-purpose I/O
15	PA1	I/O	General-purpose I/O
16	PA2	I/O	General-purpose I/O
17	PA3	I/O	General-purpose I/O
18	VSS	S	Ground
19	VDD	S	Supply
20	PA4	I/O	General-purpose I/O
21	PA5	I/O	General-purpose I/O
22	PA6	I/O	General-purpose I/O
23	PA7	I/O	General-purpose I/O
24	PC4	I/O	General-purpose I/O
25	PC5	I/O	General-purpose I/O
26	PB0	I/O	General-purpose I/O
27	PB1	I/O	General-purpose I/O
28	PB2	I/O	General-purpose I/O
29	PB10	I/O	General-purpose I/O
30	PB11	I/O	General-purpose I/O
31	VSS	S	Ground
32	VDD	S	Supply
33	PB12	I/O	General-purpose I/O
34	PB13	I/O	General-purpose I/O
35	PB14	I/O	General-purpose I/O
36	PB15	I/O	General-purpose I/O
37	PC6	I/O	General-purpose I/O
38	PC7	I/O	General-purpose I/O
39	PC8	I/O	General-purpose I/O
40	PC9	I/O	General-purpose I/O
41	PA8	I/O	General-purpose I/O
42	PA9	I/O	General-purpose I/O
43	PA10	I/O	General-purpose I/O
44	PA11	I/O	General-purpose I/O
45	PA12	I/O	General-purpose I/O
46	PA13	I/O	JTMS-SWDIO (debug)
47	VSS	S	Ground
48	VDD	S	Supply
49	PA14	I/O	JTCK-SWCLK (debug)
50	PA15	I/O	JTDI (debug)
51	PC10	I/O	General-purpose I/O
52	PC11	I/O	General-purpose I/O
53	PC12	I/O	General-purpose I/O
54	PD2	I/O	General-purpose I/O
55	PB3	I/O	JTDO-TRACESWO (debug)
56	PB4	I/O	NJTRST (debug)
57	PB5	I/O	General-purpose I/O
58	PB6	I/O	General-purpose I/O
59	PB7	I/O	General-purpose I/O
60	PB8	I/O	General-purpose I/O
61	PB9	I/O	General-purpose I/O
62	VSS	S	Ground
63	VDD	S	Supply
64	PD1	I/O	General-purpose I/O

Notes

• Pin numbering extracted from Figure 9 (STM32F446xC/xE LQFP64 pinout diagram).
• Debug pins (PA13, PA14, PA15, PB3, PB4): Used for JTAG/SWD debugging; can be repurposed as GPIO after debug is disabled.
• Oscillator pins (PC14-OSC32_IN, PC15-OSC32_OUT, PH0-OSC_IN, PH1-OSC_OUT): Reserved for crystal oscillators; do not use as GPIO if oscillators are active.
• Power pins (VDD, VSS, VDDA, VSSA, VBAT): Multiple supply pins must all be properly decoupled and connected.
• Reset pin (NRST): Bidirectional with internal weak pull-up; external pull-up and filtering capacitor recommended.
• All I/O pins are 5V-tolerant (FT) unless otherwise specified in the datasheet.
• Alternate functions available through GPIO_AFR registers as detailed in Table 11.

The maximum chip-junction temperature, T J max, in degrees Celsius, may be calculated using the following equation:

T J max = T A max + (P D max x Θ JA )

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK ® packages, depending on their level of environmental compliance. ECOPACK ® specifications, grade definitions and product status are available at: www.st.com . ECOPACK ® is an ST trademark.

Figure 15. LQFP64-10x10 mm 64 pin low-profile quad flat package outline

1. Drawing is not to scale

83

Table 13. LQFP64 - 10 x 10 mm low-profile quad flat package mechanical data

Symbol	millimeters	millimeters	millimeters	inches (1)	inches (1)	inches (1)
Symbol	Min	Typ	Max	Min	Typ	Max
A	-	-	1.600	-	-	0.0630
A1	0.050	-	0.150	0.0020	-	0.0059
A2	1.350	1.400	1.450	0.0531	0.0551	0.0571
b	0.170	0.220	0.270	0.0067	0.0087	0.0106
c	0.090	-	0.200	0.0035	-	0.0079
D	11.800	12.000	12.200	0.4646	0.4724	0.4803
D1	9.800	10.000	10.200	0.3858	0.3937	0.4016
D3	-	7.500	-	-	0.2953	-
E	11.800	12.000	12.200	0.4646	0.4724	0.4803
E1	9.800	10.000	10.200	0.3858	0.3937	0.4016
E3	-	7.500	-	-	0.2953	-
e	-	0.500	-	-	0.0197	-
L	0.450	0.600	0.750	0.0177	0.0236	0.0295
L1	-	1.000	-	-	0.0394	-
K	0°	3.5°	7°	0°	3.5°	7°
ccc	-	-	0.080	-	-	0.0031

Table 13. LQFP64 - 10 x 10 mm low-profile quad flat package mechanical data

Figure 16. LQFP100, 14 x 14 mm 100-pin low-profile quad flat package outline

Table 14. LQPF100, 14 x 14 mm 100-pin low-profile quad flat package mechanical data

Symbol	millimeters	millimeters	millimeters	inches (1)	inches (1)	inches (1)
Symbol	Min	Typ	Max	Min	Typ	Max
A	-	-	1.600	-	-	0.0630
A1	0.050	-	0.150	0.0020	-	0.0059
A2	1.350	1.400	1.450	0.0531	0.0551	0.0571
b	0.170	0.220	0.270	0.0067	0.0087	0.0106
c	0.090	-	0.200	0.0035	-	0.0079
D	15.800	16.000	16.200	0.6220	0.6299	0.6378
D1	13.800	14.000	14.200	0.5433	0.5512	0.5591
D3	-	12.000	-	-	0.4724	-
E	15.800	16.000	16.200	0.6220	0.6299	0.6378

Table 14. LQPF100, 14 x 14 mm 100-pin low-profile quad flat package mechanical data

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Table 14. LQPF100, 14 x 14 mm 100-pin low-profile quad flat package mechanical data (continued)

Symbol	millimeters	millimeters	millimeters	inches (1)	inches (1)	inches (1)
Symbol	Min	Typ	Max	Min	Typ	Max
E1	13.800	14.000	14.200	0.5433	0.5512	0.5591
E3	-	12.000	-	-	0.4724	-
e	-	0.500	-	-	0.0197	-
L	0.450	0.600	0.750	0.0177	0.0236	0.0295
L1	-	1.000	-	-	0.0394	-
k	0°	3.5°	7°	0°	3.5°	7°
ccc	-	-	0.080	-	-	0.0031

1. Values in inches are converted from mm and rounded to 4 decimal digits.
2. Dimensions are expressed in millimeters.
3. Drawing is not to scale.

Figure 17. LQPF100 recommended footprint

Figure 18. LQFP144, 20 x 20 mm, 144-pin low-profile quad flat package outline

1. Drawing is not to scale.

83

Table 15. LQFP144, 20 x 20 mm, 144-pin low-profile quad flat package mechanical data

Symbol	millimeters	millimeters	millimeters	inches (1)	inches (1)	inches (1)
Symbol	Min	Typ	Max	Min	Typ	Max
A	-	-	1.600	-	-	0.0630
A1	0.050	-	0.150	0.0020	-	0.0059
A2	1.350	1.400	1.450	0.0531	0.0551	0.0571
b	0.170	0.220	0.270	0.0067	0.0087	0.0106
c	0.090	-	0.200	0.0035	-	0.0079
D	21.800	22.000	22.200	0.8583	0.8661	0.874
D1	19.800	20.000	20.200	0.7795	0.7874	0.7953
D3	-	17.500	-	-	0.689	-
E	21.800	22.000	22.200	0.8583	0.8661	0.8740
E1	19.800	20.000	20.200	0.7795	0.7874	0.7953
E3	-	17.500	-	-	0.6890	-
e	-	0.500	-	-	0.0197	-
L	0.450	0.600	0.750	0.0177	0.0236	0.0295
L1	-	1.000	-	-	0.0394	-
k	0°	3.5°	7°	0°	3.5°	7°
ccc	-	-	0.080	-	-	0.0031

Table 15. LQFP144, 20 x 20 mm, 144-pin low-profile quad flat package mechanical data

Figure 19. LQFP144 recommended footprint

Figure 19. LQFP144 recommended footprint

1. Dimensions are expressed in millimeters.

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Figure 20. UFBGA144, 7x7x0.60 R12x12 P 0.5mm, package outline

1. Dimensions are expressed in millimeters.

Table 16. UFBGA144, 7 x 7 x 0.60 R12x12 P 0.5 mm, 144-pin package mechanical data

Symbol	millimeters	millimeters	millimeters	inches (1)	inches (1)	inches (1)
Symbol	Typ	Min	Max	Typ	Min	Max
A	0.53	0.46	0.6	0.0209	0.0181	0.0236
A1	0.08	0.05	0.11	0.0031	0.002	0.0043
A2	0.45	0.4	0.5	0.0177	0.0157	0.0197
A3	0.13	0.08	0.18	0.0051	0.0031	0.0071
A4	0.32	0.27	0.37	0.0126	0.0106	0.0146
b	0.25	0.2	0.3	0.0098	0.0079	0.0118
D	7	6.95	7.05	0.2756	0.2736	0.2776
D1	5.5	5.45	5.55	0.2165	0.2146	0.2185
E	7	6.95	7.05	0.2756	0.2736	0.2776
E1	5.5	5.45	5.55	0.2165	0.2146	0.2185
e	0.5			0.0197
F	0.75	0.7	0.8	0.0295	0.0276	0.0315
ddd			0.1			0.0039

Table 16. UFBGA144, 7 x 7 x 0.60 R12x12 P 0.5 mm, 144-pin package mechanical data