The AT32F408 series are based on the high-performance ARM®Cortex® -M4F 32-bit RISC coreoperating at a frequency of up to 216 MHz. The Cortex® -M4F core features a single-precision Floating Point Unit (FPU) supporting all ARM® single-precision data processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) that enhances application security.

The AT32F408 series incorporate high-speed on-chip memories, including up to 512 Kbytes of Flash memory, 192 Kbytes of SRAM, and 26 Kbytes of boot memory that can be used as a Bootloader or as a general instruction/data memory (one-time-configurable) to achieve the maximum of 512+26 Kbytes, as well as 4 Kbytes of OTP data storage space. Any block of the embedded Flash memory can be protected by the “sLib” (security library), functioning as a security area with code-executable only. In addition, the AT32F408 devices include a high-level memory extension: quad SPI memory interface (QSPI).

The AT32F408 series offer three 12-bit ADC, seven general-purpose 16-bit timers plus one general-purpose 32-bit timer, two basic timers, one advanced timer and one low-power ERTC. They also feature standard and advanced communication interfaces: up to three I2Cs, eight SPIs (multiplexed as half-duplexed I2Ss), six USARTs, two UARTs, one OTGHS interface, and one infrared transmitter.

The AT32F408 series operate in the -40 to +105 °C temperature range, from a 2.4 to 3.6 V power supply. A comprehensive set of power-saving mode allows the design of low-power application.

The AT32F408 devices are supplied in different package types. They are almost pin-to-pin (except for a few exceptions), software and functionally compatible throughout the AT32F408 series, except that the configurations of peripherals are not fully identical depending on the package types.

Key Features

· Core: ARM® 32-bit Cortex® -M4F CPU with FPU

- 216 MHz maximum frequency, with a memory protection unit (MPU), single-cycle multiplication and hardware division

- Floating point unit (FPU)

- DSP instructions

· Memories

- 256 to 512 Kbytes of Flash memory

- 26 Kbytes of boot memory used as a Bootloader or as a general instruction/data memory (one-time programmable)

- 4 Kbytes of OTP memory

- sLib: configurable part of main Flash as a library area with code executable but secured, non-readable

- 128 to 192 Kbytes of SRAM

- QSPI interfacing for external SPI memory or SPI RAM extension, supporting address mapping mode

· Power control (PWC)

- 2.4 to 3.6 V supply

- Power-on reset (POR), low voltage reset(LVR), and power voltage monitoring (PVM)

- Low power modes: Sleep, Deepsleep, and Standby modes

- 20x 32-bit battery powered registers (BPR)

· Clock and reset management (CRM)

- 4 to 25 MHz crystal (HEXT)

- 48 MHz internal factory-trimmed high speed clock (HICK), ±1% accuracy at TA = 25 °C and ±2.5% accuracy at TA = -40 °C to +105 °C

- 32 kHz crystal (LEXT)

- Low speed internal clock (LICK)

· Analog

- 3x 12-bit 5.33 MSPS A/D converter, up to 16 external input channels, 12/10/8/6-bit resolution, hardware over-sampling up to equivalent 16-bit resolution, four external multiplexer control pins EMUX_S operating conjunction with A/D convertion

- Dedicated VREF+ pin (for package information of -7R type only)

- Temperature sensor (VTS), internal reference voltage (VINTRV)

· DMA

- 2x 7-channel DMA controllers with flexible mapping capability

· Up to 57 fast GPIOs

- All mappable on 16 external interrupts (EXINT)

- Almost all 5 V-tolerant

· Up to 14 timers (TMR)

- 1x 16-bit 8-channel advanced timer, including 4 pairs of complementary PWM outputs with dead-time generator and emergency brake

- Up to 7x 16-bit + 1x 32-bit general-purpose timers, each with up to 4 IC/OC/PWM or pulse counter and quadrature encoder input

- 2x 16-bit basic timers

- 2x watchdog timers (general WDT and windowed WWDT)

- SysTick timer: a 24-bit downcounter

· ERTC: enhanced RTC with auto-wakeup, alarm, subsecond accuracy, and hardware calendar, calibration feature

· Up to 21 communication interfaces

- Up to 3x I2C interfaces (SMBus/PMBus)

- Up to 8x SPI interfaces (36 Mbit/s), all with multiplexed half-duplex I2S

- Up to 6x USART interfaces and 2x UART interfaces, support master synchronization SPI and modem control, ISO7816 interface, LIN, IrDA, and RS485 driver enable, TX/RX swap

- 1x OTGHS high speed controller with onchip PHY, dedicated 4 KB buffer

- Infrared transmitter (IRTMR)

· CRC calculation unit

· 96-bit unique ID (UID)

· Debug mode

- SWD and SWO interfaces

· Operating temperatures: -40 to +105 °C

· Packages

- LQFP64 7 x 7 mm

- QFN48 6 x 6 mm