原标题：ADI ADuCRF101低功耗无线数据采集解决方案

　　ADI公司的ADuCRF101是全集成无线数据采集系统,集成了12位SAR ADC,低功耗ARM Cortex™-M3处理器, 862 MHz- 928 MHz 和431 MHz- 464 MHz RF收发器以及闪存/EE存储器,包括UART, I2C, SPI, GPIO端口和PWM在内的外设,主要用在无线传感器,远程医疗系统,工业和家庭自动化,财产跟踪,安全系统以及医疗保健设备等.本文介绍了ADuCRF101主要特性和优势,框图, ADuCRF101迷你评估板主要特性,电路图和PCB元件布局图.

　　The ADuCRF101 is a fully integrated, data acquisition solution that is designed for low power, wireless applications. It features a 12-bit analog-to-digital converter (ADC), a low power ARM Cortex™-M3 processor, a 862 MHz to 928 MHz and 431 MHz to 464 MHz RF transceiver, and Flash®/EE memory. The ADuCRF101 is packaged in a 9 mm × 9 mm LFCSP.

　　The data acquisition section consists of a 12-bit SAR ADC. The six inputs can be configured in single-ended or differential mode. When configured in single-ended mode, they can be used for ratiometric measurements on sensors that are powered, when required, from the internal low dropout regulator (LDO). An internal battery monitor channel and an on-chip tempera-ture sensor are also available.

　　This wireless data acquisition system is designed to operate in battery-powered applications where low power is critical. The device can be configured in normal operating mode or different low power modes under direct program control. In flexi mode, any peripheral can wake up the device and operate it. In hibernate mode, the internal wake-up timer remains active. In shutdown mode, only an external interrupt can wake up the device.

　　The ADuCRF101 integrates a low power ARM Cortex-M3 processor. It is a 32-bit RISC machine, offering up to 1.25 DMIPS peak performance. The ARM Cortex-M3 processor also has a flexible 14-channel direct memory access (DMA) controller that supports communication peripherals, serial peripheral interface (SPI), UART, and I2C. Also provided on chip are 128 kB of nonvolatile Flash/EE memory and 16 kB of SRAM.

　　A 16 MHz on-chip oscillator generates the system clock. This clock can be internally divided for the processor to operate at a lower frequency, thus saving power. A low power, internal 32 kHz oscillator is available and can be used to clock the four timers, as follows: two general-purpose timers, a wake-up timer, and a system watchdog timer.

　　A range of communication peripherals can be configured, as required, in a specific application. These peripherals include UART, I2C, SPI, GPIO ports, PWM, and RF transceivers.

　　The RF transceiver communicates in the 862 MHz to 928 MHz and 431 MHz to 464 MHz frequency bands using multiple configurations.

　　On-chip factory firmware supports in-circuit serial download via the UART, and nonintrusive emulation and program download are also supported via the serial wire interface. These features are incorporated into a low cost development system supporting this precision analog microcontroller family.

　　The ADuCRF101 operates from 2.2 V to 3.6 V and is specified over an industrial temperature range of −40°C to +85°C. It is available in a 64-lead LFCSP package

　　ADuCRF101应用:

　　Battery powered wireless sensor

　　Medical telemetry systems

　　Industrial and home automation

　　Asset tracking

　　Security systems (access systems)

　　Health and fitness applications

　　ADuCRF101主要特性和优势:

　　Analog I/O

　　6-Channel 12-bit SAR ADC

　　Single-ended and differential inputs

　　Programmable data rate up to 167 kSPS

　　On-chip voltage reference

　　Supply rante: 2.2V to 3.6V

　　Power Consumption

　　280 nA, in power-down mode, nonretained state

　　1.9 µA, in power-down mode, processor memory and transceiver memory retained

　　210 µA/Mhz, Cortex-M3 in active mode

　　12.8 mA transceiver in receive mode, Cortex-M3 in power-down mode

　　9 mA to 32 mA transceiver in transmit mode, Cortex-M3 in power-down mode

　　RF Transceiver

　　Frequency bands, 862 MHz to 928 MHz and 431 MHz to 464 MHz

　　Multiple Configurations supported

　　Receiver sensitivity (BER), −107.5 dBm at 38.4 kbps, 2FSK

　　Single and ended and differential PA

　　Low external BOM

　　Microcontroller

　　32-bit ARM Cortex-M3 processor

　　Serial Wire download and debug

　　External Watch crystal for wakeup timer

　　16 MHz internal Oscillator with 8-way Programmable Divider

　　Memory 128 kB Flash/EE memory, 16 kB SRAM

　　10,000-cycle Flash/EE endurance

　　10-year Flash/EE retention

　　In-circuit download via serial wire and UART

　　On-Chip Peripherals

　　UART, I2C and SPI Serial I/O

　　28-pin GPIO port

　　2 general-purpose, 16-bit timers

　　32-bit wake-up timer

　　16-bit watchdog timer

　　8-channel pulse-width modulation (PWM)

　　Package

　　64-lead, 9 mm × 9 mm LFCSP

　　Temperature range: −40°C to +85°C

　　Tools

　　Low cost development system

　　Third-party compiler and emulator tool support

　　图1. ADuCRF101功能框图

　　ADuCRF101迷你评估板

　　The ADuCRF101 is a fully integrated data acquisition solution designed for low power wireless applications. It features a 12-bit ADC, a low power ARM Cortex™-M3 processor, a 431MHz to 464 MHz and 862 MHz to 928 MHz RF transceiver, and Flash/EE memory, in a 9 mm × 9 mm LFCSP package.

　　The ADuCRF101 mini board allows a user to program, debug and evaluate the performance of the ADuCRF101. Its small form factor makes it the ideal hardware for evaluation of large wireless sensor network.

　　Different hardware kits are available, from a mini board on its own, to a combination of emulator and boards.

　　Software Contents:

　　Keil MDKARM evaluation version integrated software development tool.

　　IAR EWARM evaluation version integrated software development tool.

　　CM3WSD Serial Downloader

　　Example Code

　　Function Libraries

　　Get Started User Guide

　　Datasheets, Application Notes, Etc

　　图2. ADuCRF101迷你评估板外形图