AT32F421G8U7

Introduction

 AT32F421G8U7 is a cost-optimized 32-bit microcontroller launched by ArteryTek, belonging to the AT32F421 series. Built around the Arm® Cortex®-M4F core, it integrates a single-precision Floating-Point Unit (FPU) and a complete Digital Signal Processing (DSP) instruction set. With support from ArteryTek’s proprietary sLib (Super Library) security acceleration library, it operates at up to 120 MHz with a computing performance of approximately 150 DMIPS—delivering high-performance, low-power embedded solutions ideal for cost-sensitive applications.

The chip integrates 64 KB of on-chip Flash and 16 KB of on-chip SRAM, housed in a compact 32-pin QFN (5×5 mm) package, and supports an extended industrial temperature range of −40°C to +105°C. It features USB Full-Speed device capability, multiple communication interfaces, and rich analog peripherals—making it well-suited for intelligent terminals and control applications where size, power consumption, and cost are critical constraints.

Key Features

Core & Performance

• 32-bit Arm® Cortex®-M4F Core: Equipped with single-precision FPU, Memory Protection Unit (MPU), and full DSP instruction set
• 120 MHz Maximum Frequency: Delivers ~150 DMIPS computational performance for efficient control and signal processing algorithms
• sLib Security Acceleration Library: Supports code encryption, region read protection, and execution optimization
• Single-Cycle DSP Instructions: Accelerates filtering, FFT, and other mathematical operations
• Multi-Layer AHB Bus Matrix: Ensures high-bandwidth concurrent access for multiple peripherals

Memory Configuration

• 64 KB On-Chip Flash: Supports Read-While-Write, sector erase, and multi-level security protection
• 16 KB On-Chip SRAM: For high-speed data caching and real-time processing
• External Storage Expansion: SPI interface for connecting serial Flash (no dedicated QSPI or SDRAM controller)
• RTC Backup Registers: 20 × 32-bit registers retain critical parameters during low-power operation

Connectivity & Peripherals

• 26 GPIO Pins (in QFN32 package): Some pins are 5V-tolerant, interrupt-capable, and feature flexible alternate function mapping
• Communication Interfaces:
  • 2× USART (USART1 supports LIN bus)
  • 2× SPI/I²S (full-duplex, up to 36 MHz)
  • 2× I²C (supports SMBus protocol)
  • 1× USB 2.0 Full-Speed Device Controller (integrated PHY; no OTG capability)
• Analog Peripherals:
  • 1× 12-bit ADC (1.2 MSPS, up to 10 channels—subject to pin count limitations)
  • 2× Ultra-low-power Analog Comparators
• Timer System (9 total):
  • 1× Advanced Control PWM Timer (with programmable dead-time generation for BLDC motor control)
  • 2× 32-bit + 2× 16-bit General-Purpose Timers
  • 2× Basic Timers + Independent/Window Watchdog + SysTick + RTC
• Other Features:
  • 1× DMA Controller (5 channels)
  • CRC unit and TRNG (True Random Number Generator)
  • SWD debugging interface (JTAG not supported)

Power & Packaging

• Supply Voltage Range: 2.6 V to 3.6 V
• Low-Power Modes:
  • Deep Sleep mode (typ. 2.5 μA)
  • Standby mode (typ. 1.8 μA)
  • Run-mode power consumption ~90 μA/MHz
• Package: 32-pin QFN (5×5 mm), optimized for compact design and thermal performance
• Operating Temperature: −40°C to +105°C (extended industrial grade)
• Environmental Compliance: RoHS compliant, lead-free, and halogen-free

Other Features

• Enhanced RTC: Calendar, alarm, sub-second precision, and low-power timekeeping
• Power Monitoring: Programmable Voltage Detector (PVD) and Brown-Out Reset (BOR)
• 96-bit Unique Device ID: For secure authentication and traceability
• Boot Options: ISP (In-System Programming) and IAP (In-Application Programming) support
• Flexible Clock Configuration: Internal 48 MHz RC oscillator and external crystal support

Typical Applications

• Consumer Electronics: Smartwatches, electronic toys, personal care devices
• Smart Home: Smart sockets, lighting controllers, environmental sensor nodes
• Industrial Control: Small actuators, sensor interfaces, basic motor drivers
• IoT Terminals: LoRa/BLE nodes, data loggers, battery-powered edge devices
• Portable Devices: Electronic shelf labels (ESL), handheld instruments, health monitors (thermometers, pulse oximeters)
• Automotive Electronics: Non-safety-critical modules (headlight control, seat adjustment)