ADI ADuCM360热电偶温度监测解决方案

1、ADI ADuCM360热电偶温度监测解决方案ADI公司的ADuCM360是全集成的4kSPS 24位数据采集系统,集成了两个高性能多路Sigma-Delta (Σ-Δ) ADC,32位ARM Cortex M3®MCU和闪存/EE存储器,能直接双线和外接精密传感器接口,并采用电池供电.模拟输入/输出,单端和全差分输入,输入范围±6.64 mV 到±1.2 V,可编程ADC输出速率(4Hz到4kHz),可编程增益从1到128,RMS噪音为43nV 3.75Hz和180nV 50Hz,主要用于工业自动化和过程控制,智能的精密检测系统,4

2、mA到20mA回路智能传感器系统,医疗设备和病人监护.本文介绍了ADuCM360主要特性,方框图,以及采用ADuCM360和外接热电偶的基于USB温度监测器特性,电路图和材料清单与PCB布局图.The ADuCM360 is a fully integrated, 4 kSPS, 24-bit data acqui-sition system incorporating dual, high performance multi-channel sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), 32-bit AR

3、M Cortex M3®MCU, and Flash/EE memory on a single chip. The part is designed for direct interfacing to external precision sensors in both wired and battery powered applications.The ADuCM361 contains all the features of the ADuCM360 except the primary ADC, ADC0 is not available – only the au

4、xiliary ADC, ADC1 is available.The device contains an on-chip 32 KHz oscillator and an internal 16MHz high-frequency oscillator. This clock is routed through a programmable clock divider from which the MCU core clock operating frequency is generated. The maximum core clock speed is 16MHz and this is

5、 not limited by operating voltage or temperature.The microcontroller core is a low power Cortex-M3 core from ARM. It is a 32-bit RISC machine, offering up to 20 MIPS peak performance. The Cortex-M3 MCU incorporates a flexible 11-channel DMA controller supporting all wired (SPI, UART, I2C) communicat

6、ion peripherals. 128k Bytes of non-volatile Flash/EE and 8k Bytes of SRAM are also integrated on-chip.The Analog sub-system consists of dual ADCs each connected to a flexible input MUX. Both ADCs can operate in fully differential and single ended modes. Other on-chip ADC features include dual progra

7、mmable excitation current sources, burn-out current sources and a bias voltage generator of AVDD_REG/2 (900mV) to set the common-mode voltage of an input channel. A low-side internal ground switch is provided to allow powering down of a bridge between conversions. The ADCs contain two parallel filte

8、rs – a Sinc3 or Sinc4 in parallel with a Sinc2. The Sinc3 or Sinc4 filter is for precision measurements. The Sinc2 filter is for fast measurements and for detection of step changes in the input signal The device also contains a low noise, low drift internal band-gap reference or can be configu

9、red to accept up to 2 external reference sources in ratiometric measurement configurations. An option to buffer the external reference inputs is also provided on-chip. A single-channel buffered voltage output DAC is also provided on chip. The ADuCM360/ADuCM361 also integrates a range of on-chip peri

10、pherals which can be configured under microcontroller software control as required in the application. These peripherals include UART, I2C and dual SPI Serial I/O communication controllers, 19-Pin GPIO Ports, 2 General Purpose Timers, Wake-up Timer and System Watchdog Timer. A 16-bit PWM with six ou

11、tput channels is also provided.The ADuCM360/ADuCM361 is specifically designed to operate in battery powered applications where low power operation is critical. The microcontroller core can be configured in a normal operating mode consuming 290μA/MHz (including Flash/SRAM Idd) resulting in an over

12、all system current consumption of 1mA when all peripherals are active.The part can also be configured in a number of low power operating modes under direct program control, including hibernate mode (internal wake-up timer active) consuming only 4μA. In hibernate mode, peripherals such as external

13、 interrupts or the internal wake up timer can wake up the device. This allows the part to operate in an ultra-low power operating mode and still respond to asynchronous external or periodic events.On-chip factory firmware supports in-circuit serial download via a serial wire interface (2-pin JTAG sy

14、stem) and UART while non-intrusive emulation is also supported via the serial wire interface. These features are incorporated into a low-cost QuickStart Development System supporting this Precision Analog Microcontroller family.The part operates from an external 1.8V to 3.6V voltage supply and is sp

15、ecified over an industrial temperature range of -40°C to 125.The ADuCM360 is a fully integrated, 4 kSPS, 24-bit data acqui-sition system incorporating dual, high performance multi-channel sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), 32-bit ARM Cortex M3®MCU, and Flash/E

16、E memory on a single chip. The part is designed for direct interfacing to external precision sensors in both wired and battery powered applications.The ADuCM361 contains all the features of the ADuCM360 except the primary ADC, ADC0 is not available – only the auxiliary ADC, ADC1 is available.T

17、he device contains an on-chip 32 KHz oscillator and an internal 16MHz high-frequency oscillator. This clock is routed through a programmable clock divider from which the MCU core clock operating frequency is generated. The maximum core clock speed is 16MHz and this is not limited by operating voltag

18、e or temperature.The microcontroller core is a low power Cortex-M3 core from ARM. It is a 32-bit RISC machine, offering up to 20 MIPS peak performance. The Cortex-M3 MCU incorporates a flexible 11-channel DMA controller supporting all wired (SPI, UART, I2C) communication peripherals. 128k Bytes of n

19、on-volatile Flash/EE and 8k Bytes of SRAM are also integrated on-chip.The Analog sub-system consists of dual ADCs each connected to a flexible input MUX. Both ADCs can operate in fully differential and single ended modes. Other on-chip ADC features include dual programmable excitation current source

20、s, burn-out current sources and a bias voltage generator of AVDD_REG/2 (900mV) to set the common-mode voltage of an input channel. A low-side internal ground switch is provided to allow powering down of a bridge between conversions. The ADCs contain two parallel filters – a Sinc3 or Sinc4 in p

21、arallel with a Sinc2.The Sinc3 or Sinc4 filter is for precision measurements. The Sinc2 filter is for fast measurements and for detection of step changes in the input signal The device also contains a low noise, low drift internal band-gap reference or can be configured to accept up to 2 external re

22、ference sources in ratiometric measurement configurations. An option to buffer the external reference inputs is also provided on-chip. A single-channel buffered voltage output DAC is also provided on chip. The ADuCM360/ADuCM361 also integrates a range of on-chip peripherals which can be configured u

23、nder microcontroller software control as required in the application. These peripherals include UART, I2C and dual SPI Serial I/O communication controllers, 19-Pin GPIO Ports, 2 General Purpose Timers, Wake-up Timer and System Watchdog Timer. A 16-bit PWM with six output channels is also provided.Th

24、e ADuCM360/ADuCM361 is specifically designed to operate in battery powered applications where low power operation is critical. The microcontroller core can be configured in a normal operating mode consuming 290μA/MHz (including Flash/SRAM Idd) resulting in an overall system current consumption of

25、 1mA when all peripherals are active.The part can also be configured in a number of low power operating modes under direct program control, including hibernate mode (internal wake-up timer active) consuming only 4μA. In hibernate mode, peripherals such as external interrupts or the internal wake

26、up timer can wake up the device. This allows the part to operate in an ultra-low power operating mode and still respond to asynchronous external or periodic events.On-chip factory firmware supports in-circuit serial download via a serial wire interface (2-pin JTAG system) and UART while non-intrusiv

27、e emulation is also supported via the serial wire interface. These features are incorporated into a low-cost QuickStart Development System supporting this Precision Analog Microcontroller family.The part operates from an external 1.8V to 3.6V voltage supply and is specified over an industrial temper

28、ature range of -40 to 125.ADuCM360主要特性:Analog Input/OutputDual (24-bit) ADCs (ADuCM360)Single (24-bit) ADC (ADuCM361)Single Ended and fully Differential inputsProgrammable ADC output rate (4 Hz to 4 kHz)Simultaneous 50Hz/60Hz rejection50SPS Continuous Conversion Mode16.67SPS Single Conversion ModeFl

29、exible input MUX for input channel selection to both ADCsPrimary and Auxiliary (24-bit) ADC channel6 differential or 11 Single-Ended input channels4 internal channels for monitoring DAC, Temperature sensor, IOVDD and AVDD (ADC1 only)Programmable Gain (1 to 128)Selectable input range: ±6.64 mV

30、 to ±1.2 VRMS noise: 43nV 3.75Hz, 180nV 50HzProgrammable sensor excitation current sources10/50/100/150/200/250/300/400/500/600/800uA and 1mA current source optionsOn-chip precision Voltage reference (±4 ppm/)Single 12-bit voltage output DACNPN mode for 4-20mA loop applicationsMicrocon

31、trollerARM Cortex™M3 32-bit processor Serial Wire download and debug Internal Watch crystal for wakeup timer 16MHz Oscillator with 8-way Programmable DividerMemory 128k Bytes Flash/EE Memory, 8k Bytes SRAM In-circuit debug/download via Serial Wire and UARTPower Operates directly from a 3.0V ba

32、ttery Supply Range: 1.8V to 3.6V (max)Power ConsumptionMCU Active Mode: Core consumes 290μA / MHzActive Mode: 1.0mA (All peripherals active), core operating at 500KHzPower down mode: 4μA (WU Timer Active)On-Chip PeripheralsUART, I2C and 2 x SPI Serial I/O16-bit PWM Controller19-Pin Multi-Funct

33、ion GPIO Port2 General Purpose TimersWake-up Timer/Watchdog TimerMulti-Channel DMA and Interrupt ControllerPackage and Temperature Range48 lead LFCSP (7mm x 7mm) package –40 to 125Development ToolsLow-Cost QuickStart™Development SystemThird-Party Compiler and emulator tool SupportMultipl

34、e Functional Safety features for improved diagnosticsADuCM360主要应用:Industrial automation and process controlIntelligent, precision sensing systems4 mA to 20 mA loop-powered smart sensor systemsMedical devices, patient monitoring图1.ADuCM360方框图采用ADuCM360精密模拟微控制器和外接热电偶的基于USB温度监测器This circuit uses the ADuCM360/ADuCM361 precision analog microcontroller in a