ADI公司的ADUCM360是24位數據采集系統解決方案,集成了兩個多路24位Sigma-Delta ADC,32位ARM Cortex M3 MCU以及閃存/EE存儲器,能直接和外部精密的傳感器接口.單端和全差分輸入,可編程ADC輸出速率(4Hz到4kHz),同時對50Hz/60Hz抑制,主要用在工業(yè)自動化和過程控制,智能精密的傳感器系統,4-20mA回路智能傳感器系統,醫(yī)療設備和病人監(jiān)護.本文介紹了ADuCM360主要特性, 方框圖以及ADUCM360/361評估板主要特性,電路圖和PCB布局圖.
The ADuCM360 is a fully integrated, 4 kSPS, 24-bit data acquisition system incorporating dual, high performance multi-channel sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), 32-bit ARM 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 auxiliary 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 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) communication 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 programmable 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 filters – 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 configured 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 peripherals 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 output 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 overall 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 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 system) 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 specified over an industrial temperature range of -40℃ to 125℃.
The ADuCM360 is a fully integrated, 4 kSPS, 24-bit data acquisition system incorporating dual, high performance multi-channel sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), 32-bit ARM 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 auxiliary 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 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) communication 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 programmable 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 filters – 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 configured 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 peripherals 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 output 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 overall 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 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 system) 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 specified over an industrial temperature range of -40℃ to 125℃.
ADuCM360主要特性:
Analog Input/Output
Dual (24-bit) ADCs (ADuCM360)
Single (24-bit) ADC (ADuCM361)
Single Ended and fully Differential inputs
Programmable ADC output rate (4 Hz to 4 kHz)
Simultaneous 50Hz/60Hz rejection
50SPS Continuous Conversion Mode
16.67SPS Single Conversion Mode
Flexible input MUX for input channel selection to both ADCs
Primary and Auxiliary (24-bit) ADC channel
6 differential or 11 Single-Ended input channels
4 internal channels for monitoring DAC, Temperature sensor, IOVDD and AVDD (ADC1 only)
Programmable Gain (1 to 128)
Selectable input range: ±6.64 mV to ±1.2 V
RMS noise: 43nV @3.75Hz, 180nV @ 50Hz
Programmable sensor excitation current sources
10/50/100/150/200/250/300/400/500/600/800uA and 1mA current source options
On-chip precision Voltage reference (±4 ppm/℃)
Single 12-bit voltage output DAC
NPN mode for 4-20mA loop applications
Microcontroller
ARM Cortex™-M3 32-bit processor Serial Wire download and debug Internal Watch crystal for wakeup timer 16 MHz Oscillator with 8-way Programmable Divider Memory 128k Bytes Flash/EE Memory, 8k Bytes SRAM In-circuit debug/download via Serial Wire and UART
Power Operates directly from a 3.0V battery Supply Range: 1.8V to 3.6V (max)
Power Consumption
MCU Active Mode: Core consumes 290μA / MHz
Active Mode: 1.0mA (All peripherals active), core operating at 500KHz
Power down mode: 4μA (WU Timer Active)
On-Chip Peripherals
UART, I2C and 2 x SPI Serial I/O
16-bit PWM Controller
19-Pin Multi-Function GPIO Port
2 General Purpose Timers
Wake-up Timer/Watchdog Timer
Multi-Channel DMA and Interrupt Controller
Package and Temperature Range
48 lead LFCSP (7mm x 7mm) package –40℃ to 125℃
Development Tools
Low-Cost QuickStart™ Development System
Third-Party Compiler and emulator tool Support
Multiple Functional Safety features for improved diagnostics
ADuCM360/1應用:
Industrial automation and process control
Intelligent, precision sensing systems
4 mA to 20 mA loop-powered smart sensor systems
Medical devices, patient monitoring
圖1. ADuCM360方框圖
ADUCM360/361開發(fā)系統
The ADuCM360/ ADuCM361 is a low power fully integrated, 24-bit data acquisition system incorporating dual, high performance multi-channel sigma-delta (Σ-Δ) ADCs, ARM Cortex M3® MCU, and Flash/EE memory on a single chip.
ADI provides low cost development platforms for the Cortex M3 based ADuCxxx microcontrollers.
The hardware is designed for simplicity, flexibility and ease of use. This facilitates performance evaluation of the device with the minimum external components. The supplied interface and Jlink Lite boards connect to the miniboard, providing supply, UART communication and debug capability.
The QuickStart Plus Kit for the ADuCM360/361 Precision Analog Microcontrollers features true non-intrusive JTAG emulation and an assembly & C-source debugging environment. This provides a comprehensive hardware development environment.
QuickStart Plus Kit Contents:
Hardware Contents:
Evaluation Board
USB Cables
J Link Lite
Interface Board
Software Contents:
Keil MDKARMevaluation 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.
debugging environment. This provides a comprehensive hardware development environment.
圖2. ADUCM360/361開發(fā)系統外形圖
圖3. ADUCM360評估板電路圖
圖4. ADUCM360評估板PCB布局圖:頂層
圖5. ADUCM360評估板PCB布局圖:底層
詳情請見:
http://www.analog.com/static/imported-files/data_sheets/ADuCM360_361.pdf
