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AT91SAM7A3 32位ARM单片机

Status	Production
Flash (Bytes)	256K
SRAM (Bytes)	32K
CAN	2
RTC/RTT	-/1
10-bit ADC Channels	16
Peripheral DMA Channels	19
Max. Clock Speed (MHz)	60
I/O Pins	62
Enhanced USART	3
USART/DBGU	-/1
SPI	2
TWI	1
SSC	2
MCI	1
USB Device	FS
PWM Controller	8
16-bit Timers	9
Period Interval Timer	1
Watchdog Timer	1
Power-On-Reset	1
On-chip RC Oscillator	1
Crystal Oscillator/PLL	39814
ARM Core	7TDMI
MMU/MPU	MPU
I/O Voltage Domain (V)	3.3
Single Supply	Y
Pb-Free Packages	LQFP 100

AT91SAM7A3 描述

The AT91SAM7A3 is a Flash microcontroller based on the 32-bit ARM7TDMI RISC processor optimized for embedded control. It features 256K bytes of embedded high-speed Flash and 32K bytes of SRAM.

Its extensive peripheral set includes two CAN 2.0B Controllers, 8-channel 20-bit PWM Controller, nine 16-bit general purpose Timers, 16-channel 10-bit ADCs, a USB 2.0 Full Speed Device Port, MCI, USARTs, SPI, SSC and TWI.

Its Peripheral DMA Controller channels eliminate processor bottlenecks during peripheral-to-memory transfers. Its System Controller manages interrupts, clocks, power, time, debug and reset, significantly reducing the external chip count and minimizing power consumption.

In industrial temperature, worse case conditions the maximum clock frequency is 60MHz. Typical core supply is 1.8V, I/Os are supplied at 1.8V or 3.3V and are 5V tolerant. An integrated Voltage Regulator permits single supply at 3.3V. The AT91SAM7A3 is supplied in a 100-lead LQFP Green package.

It is supported by an Evaluation Board and extensive application development tools. The AT91SAM7A3 is a general-purpose microcontroller, particularly suited to real-time embedded industrial control applications that require CAN networking.

AT91SAM7A3 主要参数

1. Status:Production
2. Flash (Bytes):256K
3. SRAM (Bytes):32K
4. CAN:2
5. USB Device   :FS
6. USART/DBGU   : -/1
7. 10-bit ADC Channel:16
8. Max. Clock Speed ( :60
9. PWM Controller   :8
10. I/O Pins   :62
11. Peripheral DMA Cha:19
12. Enhanced USART   :3
13. SPI:2
14. TWI :1
15. SSC:2
16. MCI:1
17. 16-bit Timers   :9
18. Period Interval Ti   :1
19. Watchdog Timer:1
20. RTC/RTT   :-/1
21. Power-On-Reset   :1
22. On-chip RC Oscilla   :1
23. Crystal Oscillator   :1/1
24. ARM Core   :7TDMI
25. MMU/MPU   :MPU
26. I/O Voltage Domain   :3.3
27. Single Supply   : Y
28. 绿色封装 : LQFP 100

AT91SAM7A3 特性

• Incorporates the ARM7TDMI ® ARM® Thumb® Processor
  – High-performance 32-bit RISC Architecture
  – High-density 16-bit Instruction Set
  – Leader in MIPS/Watt
• EmbeddedICE™ In-circuit Emulation, Debug Communication Channel Support
• 256 Kbytes of Internal High-speed Flash, Organized in 1024 Pages of 256 Bytes
  – Single Cycle Access at Up to 30 MHz in Worst Case Conditions
  – Prefetch Buffer Optimizing Thumb Instruction Execution at Maximum Speed
  – Page Programming Time: 6 ms, Including Page Auto-erase, Full Erase Time: 15 ms
  – 10,000 Write Cycles, 10-year Data Retention Capability, Sector Lock Capabilities
• 32K Bytes of Internal High-speed SRAM, Single-cycle Access at Maximum Speed
• Memory Controller (MC)
  – Embedded Flash Controller, Abort Status and Misalignment Detection
  – Memory Protection Unit
• Reset Controller (RSTC)
  – Based on Three Power-on Reset Cells
  – Provides External Reset Signal Shaping and Reset Sources Status
• Clock Generator (CKGR)
  – Low-power RC Oscillator, 3 to 20 MHz On-chip Oscillator and One PLL
• Power Management Controller (PMC)
  – Power Optimization Capabilities, including Slow Clock Mode (Down to 500 Hz), Idle
  Mode, Standby Mode and Backup Mode
  – Four Programmable External Clock Signals
• Advanced Interrupt Controller (AIC)
  – Individually Maskable, Eight-level Priority, Vectored Interrupt Sources
  – Four External Interrupt Sources and One Fast Interrupt Source, Spurious Interrupt
  Protected
• Debug Unit (DBGU)
  – 2-wire UART and Support for Debug Communication Channel interrupt
• Periodic Interval Timer (PIT)
  – 20-bit Programmable Counter plus 12-bit Interval Counter
• Windowed Watchdog (WDT)
  – 12-bit key-protected Programmable Counter
  – Provides Reset or Interrupt Signal to the System
  – Counter May Be Stopped While the Processor is in Debug Mode or in Idle State
• Real-time Timer (RTT)
  – 32-bit Free-running Counter with Alarm
  – Runs Off the Internal RC Oscillator
• Two Parallel Input/Output Controllers (PIO)
  – Sixty-two Programmable I/O Lines Multiplexed with up to Two Peripheral I/Os
  – Input Change Interrupt Capability on Each I/O Line
  – Individually Programmable Open-drain, Pull-up resistor and Synchronous Output
• Shutdown Controller (SHDWC)
  – Programmable Shutdown Pin and Wake-up Circuitry
• Two 32-bit Battery Backup Registers for a Total of 8 Bytes
• One 8-channel 20-bit PWM Controller (PWMC)
• One USB 2.0 Full Speed (12 Mbits per Second) Device Port
  – On-chip Transceiver, 2376-byte Configurable Integrated FIFOs
• Nineteen Peripheral DMA Controller (PDC) Channels
• Two CAN 2.0B Active Controllers, Supporting 11-bit Standard and 29-bit Extended Identifiers
  – 16 Fully Programmable Message Object Mailboxes, 16-bit Time Stamp Counter
• Two 8-channel 10-bit Analog-to-Digital Converter
• Three Universal Synchronous/Asynchronous Receiver Transmitters (USART)
  – Individual Baud Rate Generator, IrDA® Infrared Modulation/Demodulation
  – Support for ISO7816 T0/T1 Smart Card, Hardware Handshaking, RS485 Support
• Two Master/Slave Serial Peripheral Interfaces (SPI)
  – 8- to 16-bit Programmable Data Length, Four External Peripheral Chip Selects
• Three 3-channel 16-bit Timer/Counters (TC)
  – Three External Clock Inputs, Two Multi-purpose I/O Pins per Channel
  – Double PWM Generation, Capture/Waveform Mode, Up/Down Capability
• Two Synchronous Serial Controllers (SSC)
  – Independent Clock and Frame Sync Signals for Each Receiver and Transmitter
  – I²S Analog Interface Support, Time Division Multiplex Support
  – High-speed Continuous Data Stream Capabilities with 32-bit Data Transfer
• One Two-wire Interface (TWI)
  – Master Mode Support Only, All Two-wire Atmel EEPROM’s Supported
• Multimedia Card Interface (MCI)
  – Compliant with Multimedia Cards and SD Cards
  – Automatic Protocol Control and Fast Automatic Data Transfers with PDC, MMC and SDCard Compliant
• IEEE® 1149.1 JTAG Boundary Scan on All Digital Pins
• Required Power Supplies
  – Embedded 1.8V Regulator, Drawing up to 130 mA for the Core and the External Components, Enables 3.3V Single Supply
  Mode
  – 3.3V VDD3V3 Regulator, I/O Lines and Flash Power Supply
  – 1.8V VDD1V8 Output of the Voltage Regulator and Core Power Supply
  – 3V to 3.6V VDDANA ADC Power Supply
  – 3V to 3.6V VDDBU Backup Power Supply
• 5V-tolerant I/Os
• Fully Static Operation: Up to 60 MHz at 1.65V and 85°C Worst Case Conditions
• Available in a 100-lead LQFP Green Package

AT91SAM7A3 订购型号

Ordering Code	Package	Package Type	Operating Temperature Range
AT91SAM7A3-AU	LQFP 100	Green	Industrial (-40° C to 85° C)

AT91SAM7A3 应用技术支持与电子电路设计开发资源下载

1. AT91SAM7A3 数据手册DataSheet 下载. PDF（简洁版）
2. AT91SAM7A3 数据手册DataSheet 下载. PDF
3. ARM7TDMI 技术白皮书
4. AT91SAM 系列产品选型指南(Brochure, 2 pages, revision E, updated 2/09)
   Product selection guide to Atmel's AT91SAM microcontrollers that give immediate access to market-leading ARM processors.
5. Atmel's ARM-based Microcontroller Excels in Real-Time (White Paper, 6 pages, revision A, updated 3/01)
   Applications such as mobile communicators, PDAs, solid-state music players and internet appliances demand the best possible real-time performance. Atmel's AT91 series of ARM-based microcontrollers incorporates a number of advanced features that enhance the real-time performance of the ARM7TDMI core, making it ideal for applications of this nature.