ATSAM3S4CA-AU

ATSAM3S4CA-AU is an Atmel (Microchip) member of the SAM3S ARM Cortex-M3 microcontroller family. It targets mid-range embedded apps needing USB and a rich peripheral set.
Key points:
- Core and speed: 32-bit ARM Cortex‑M3, up to about 72 MHz.
- Memory: embedded flash and SRAM (sizes vary by exact device variant; typical ranges are tens to hundreds of KB of flash and tens of KB of RAM).
- USB: Full‑Speed USB (device/host/OTG) capabilities.
- Peripherals: multiple serial interfaces (USART/UART, SPI, I2C/TWI), ADCs, timers, PWM, DMA, and an Event System for efficient data flow.
- Debug/boot: supports standard debug and boot options (SWD/JTAG compatible).
- Package: AU suffix specifies a particular physical package and temp grade; check the datasheet for exact pin count and packaging.
- Development: supported by Microchip Studio, GCC ARM toolchain, and CMSIS/ASF.
Applications include USB devices, motor control, data logging, and general embedded control.

Key features of ATSAM3S4CA-AU:
- 32-bit ARM Cortex-M3 core, up to 84 MHz
- On‑chip memory: Flash and SRAM (typical up to several hundred KB flash; tens of KB RAM; exact sizes depend on variant)
- USB 2.0 Full‑Speed controller with on‑chip PHY (device/host/OTG options)
- Serial interfaces: multiple USARTs, SPI, I2C (TWI)
- Analog peripherals: 12‑bit ADC with multiple channels
- Timers and PWM: several timer/counter blocks and PWM outputs
- DMA: Peripheral DMA Controller (PDC) and an event system for peripheral-to-peripheral transfers
- Clocking: flexible clock system with PLL, internal oscillators, and prescalers
- Power management: multiple low‑power modes, brown‑out detector
- I/O: extensive multi‑function I/O with pin multiplexing
- Operating voltage: 1.8–3.6 V; industrial temperature range
- Debug: JTAG/SWD debug support; on‑chip debug features
- Package: AU variant (industrial‑temperature capable)
Note: Exact Flash/SRAM sizes and available peripherals can vary by specific device revision within the ATSAM3S4CA family; consult the datasheet for precise numbers.

Pin count: 100 pins (LQFP package). Function: 32-bit ARM Cortex-M3 microcontroller (ATSAM3S4CA-AU) in the SAM3S family, with integrated flash RAM and peripherals for embedded applications.

- Manufacturer: Microchip Technology Inc. (the ATSAM3S4CA-AU is part of the SAM3S ARM Cortex-M3 microcontroller family; Atmel was acquired by Microchip in 2016).
- What kind of company: A multinational semiconductor company that designs, manufactures, and sells microcontrollers and other integrated circuits (an integrated device manufacturer).

Key application areas for ATSAM3S4CA-AU (ARM Cortex‑M3 MCU):
- Industrial automation and motor control
- Consumer electronics, home appliances, HVAC control
- Automotive body electronics and telematics
- Smart metering, energy management and building automation
- IoT endpoints, sensors, gateways, and USB peripherals
- Data acquisition, instrumentation and portable devices (medical/fitness)

LQFP package, 100-pin (TQFP/LQFP-100), typically a 14×14 mm body with 0.8 mm pitch.