原标题：Atmel SAM4S 32位ARM Cortex-M4 MCU开发方案

　　Atmel公司的SAM4S系列是基于功能强大的 ARM® Cortex™-M4的处理器，工作频率高达 120MHz,具有增强的性能和功效,更高的存储器密度如高达 2MB 的闪存和 128KB 的 SRAM以及用于实现连接,系统控制和模拟接口的丰富外设,并集成了最佳硬件代码保护. 该系列与当前基于 SAM3 Cortex-M3 处理器的微控制器是管脚对管脚和软件兼容的，主要用在消费类电子和玩具,工业控制,测试测量,医疗电子, 802.15.4无线网络和手机.本文介绍了SAM4S系列主要特性, 100和64引脚方框图, 评估板SAM4S-EK2主要特性,框图,电路图,材料清单和PCB元件布局图.

　　The Atmel SAM4S series is a member of a family of Flash microcontrollers based on the high-performance 32-bit ARM® Cortex®-M4 RISC processor. It operates at a maximum speed of 120 MHz and features up to 2048 Kbytes of Flash, with optional dual-bank implementation and cache memory, and up to 160 Kbytes of SRAM. The peripheral set includes a full-speed USB Device port with embedded transceiver, a high-speed MCI for SDIO/SD/MMC, an External Bus Interface featuring a Static Memory Controller to connect to SRAM, PSRAM, NOR Flash, LCD Module and NAND Flash, two USARTs, two UARTs, two TWIs, three SPIs, one I2S, as well as one PWM timer, two three-channel general-purpose 16-bit timers (with stepper motor and quadrature decoder logic support), one RTC, one 12-bit ADC, one 12-bit DAC and one analog comparator.

　　The SAM4S series is ready for capacitive touch, offering native support for the Atmel QTouch® library for easy implementation of buttons, wheels and sliders.

　　The SAM4S device is a medium-range general-purpose microcontroller with the best ratio in terms of reduced power consumption, processing power and peripheral set. This enables the SAM4S to sustain a wide range of applications that includes consumer, industrial control, and PC peripherals.It operates from 1.62V to 3.6V.

　　SAM4S系列主要特性:

　　 Core

　　 ARM Cortex-M4 with 2 Kbytes of cache running at up to 120 MHz

　　 Memory Protection Unit (MPU)

　　 DSP Instruction Set

　　 Thumb®-2 instruction set

　　 Pin-to-pin compatible with SAM3N, SAM3S, SAM4N and SAM7S legacy products (64-pin version)

　　 Memories

　　 Up to 2048 Kbytes embedded Flash with optional dual-bank and cache memory

　　 Up to 160 Kbytes embedded SRAM

　　 16 Kbytes ROM with embedded boot loader routines (UART, USB) and IAP routines

　　 8-bit Static Memory Controller (SMC): SRAM, PSRAM, NOR and NAND Flash support

　　 System

　　 Embedded voltage regulator for single supply operation

　　 Power-on-Reset (POR), Brown-out Detector (BOD) and Watchdog for safe operation

　　 Quartz or ceramic resonator oscillators: 3 to 20 MHz main power with failure detection and optional lowpower 32.768 kHz for RTC or device clock

　　 RTC with Gregorian and Persian calendar mode, waveform generation in low-power modes

　　 RTC clock calibration circuitry for 32.768 kHz crystal frequency compensation

　　 High-precision 8/12 MHz factory-trimmed internal RC oscillator with 4 MHz default frequency for device startup. In-application trimming access for frequency adjustment.

　　 Slow clock internal RC oscillator as permanent low-power mode device clock

　　 Two PLLs up to 240 MHz for device clock and for USB

　　 Temperature sensor

　　 Low-power tamper detection on two inputs, anti-tampering by immediate clear of general-purpose backup registers

　　 Up to 22 Peripheral DMA (PDC) Channels

　　 Low-Power Modes

　　 Sleep, wait and backup modes, down to 1 μA in backup mode

　　 Ultra low-power RTC

　　 Peripherals

　　 USB 2.0 Device: 12 Mbps, 2668 byte FIFO, up to 8 bidirectional Endpoints. On-chip transceiver.

　　 Up to two USARTs with ISO7816, IrDA®, RS-485, SPI, Manchester and Modem Mode

　　 Two 2-wire UARTs

　　 Up to two Two-Wire Interface modules (I2C-compatible), one SPI, one Serial Synchronous Controller (I2S), one high-speed Multimedia Card Interface (SDIO/SD Card/MMC)

　　 Two three-channel 16-bit Timer/Counters with capture, waveform, compare and PWM mode. Quadrature decoder logic and 2-bit Gray up/down counter for stepper motor

　　 4-channel 16-bit PWM with complementary output, fault input, 12-bit dead time generator counter for motor control

　　 32-bit Real-time Timer and RTC with calendar, alarm and 32 kHz trimming features

　　 Up to 16-channel, 1Msps ADC with differential input mode and programmable gain stage and auto calibration

　　 One 2-channel 12-bit 1Msps DAC

　　 One Analog Comparator with flexible input selection, selectable input hysteresis

　　 32-bit Cyclic Redundancy Check Calculation Unit (CRCCU) for data integrity check of off-/on-chip memories

　　 Register write protection

　　 I/O

　　 Up to 79 I/O lines with external interrupt capability (edge or level sensitivity), debouncing, glitch filtering and on-die series resistor termination

　　 Three 32-bit Parallel Input/Output Controllers, Peripheral DMA-assisted Parallel Capture mode

　　 Packages

　　 100-lead packages

　　 LQFP, 14 x 14 mm, pitch 0.5 mm

　　 TFBGA, 9 x 9 mm, pitch 0.8 mm

　　 VFBGA, 7 x 7 mm, pitch 0.65 mm

　　 64-lead packages

　　 LQFP, 10 x 10 mm, pitch 0.5 mm

　　 QFN, 9 x 9 mm, pitch 0.5 mm

　　 WLCSP, 4.42 x 3.42 mm, pitch 0.4 mm (SAM4S16/S8)

　　 WLCSP, 3.32 x 3.32 mm, pitch 0.4 mm (SAM4S4/S2)

　　 48-lead packages

　　 LQFP, 7 x 7 mm, pitch 0.5 mm

　　 QFN, 7 x 7 mm, pitch 0.5 mm

　　SAM4S系列应用:

　　Consumer goods and toys

　　Industrial control

　　Metering

　　Medical

　　Test and measurement

　　802.15.4 wireless networking

　　PC, cell phone,gaming peripherals

　　图1.SAM4SD32/SD16/SA16 100引脚方框图

　　图2.SAM4SD32/SD16/SA16 64引脚方框图

　　评估板SAM4S-EK2

　　The SAM4S-EK2 board is based on the integration of an ARM® Cortex®-M4 processor with on-board NAND Flash and a set of popular peripherals. It is designed to provide a high performance processor evaluation solution with high flexibility for various kinds of applications.

　　评估板SAM4S-EK2主要特性:

　　Here is the list of the main board components and interfaces:

　　 SAM4SD32 chip LQFP100 package with optional socket footprint

　　 12 MHz crystal

　　 32.768 KHz crystal

　　 Optional SMB connector for external system clock input

　　 NAND Flash

　　 2.8 inch TFT color LCD display with touch panel and backlight

　　 UART port with level shifter circuit

　　 USART port with level shifter circuit multiplexed with RS485 port with level shifter circuit

　　 Microphone input and mono/stereo headphone jack output

　　 SD/MMC interface

　　 Reset button: NRST

　　 User buttons: Left and Right

　　 QTouch® buttons: Up, Down, Left, Right, Valid and Slider

　　 Full Speed USB device port

　　 JTAG/ICE port

　　 On-board power regulation

　　 Two user LEDs

　　 Power LED

　　 BNC connector for ADC input

　　 BNC connector for DAC output

　　 User potentiometer connected to the ADC input

　　 ZigBEE connector

　　 2x32 bit PIO connection interfaces (PIOA, PIOC) and 1x16 bit PIO connection interface (PIOB)

　　图3. 评估板SAM4S-EK2外形图

　　图4. 评估板SAM4S-EK2框图