The ADuCM361 is a fully integrated, 4 kSPS, 24-bit data acquisition system incorporating high performance multi-channel sigma-delta (Σ-Δ) analog-to-digital converter (ADC), 32-bit ARM Cortex M3® MCU, and Flash/EE memory on a single chip allowing direct interfacing to external precision sensors in both wired and battery powered applications.
The ADuCM361 contains all the features of the ADuCM360 except that one of the AFE’s is removed.
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, not limited by operating voltage or temperature.
The microcontroller core is a low power ARM Cortex-M3, 32-bit RISC machine, offering up to 20 MIPS peak performance, incorporating a flexible 11-channel DMA controller supporting SPI, UART, I2C communication peripherals. 128k Bytes Flash/EE and 8k Bytes SRAM are integrated on-chip.Benefits: Flexibility with Precision
The Analog sub-system consists of an ADC connected to a flexible input MUX, operateingin fully differential and single ended modes. Other ADC features include dual programmable excitation current sources, burn-out current sources and a bias voltage generator to set the common-mode voltage of an input channel. A low-side internal ground switch allows bridge power down between conversions. The ADC contains two parallel filters – 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 contains a low noise, low drift internal band-gap reference or can accept up to 2 external reference sources in ratiometric measurement configurations. A single-channel buffered voltage output DAC is available. A range of on-chip peripherals are integrated on-chip. These include UART, I2C and dual SPI Serial I/O communication controllers, 19-Pin GPIO Ports, 2 General Purpose Timers, Wake-up Timer, Watchdog Timer and a 16-bit PWM with six output channels.Low Power
The ADuCM361 is 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 with all peripherals active.
The part can 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.Ease of Use
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.Applications
|Title||Content Type||File Type|
|ADuCM360/ADuCM361: Low Power, Precision Analog Microcontroller with Dual Sigma-Delta ADCs, ARM Cortex-M3 Data Sheet (Rev C, 10/2014) (pdf, 418 kB)||Data Sheets|
|AN-1320: ADuCM360/ADuCM361 Self Diagnostic Features (pdf, 160 kB)||Application Notes|
|AN-1111: Options for Minimizing Power Consumption When Using the ADuCM360/ADuCM361 (pdf, 244 kB)||Application Notes|
|AN-1160: Cortex-M3 Based ADuCxxx Serial Download Protocol (pdf, 144 kB)||Application Notes|
AN-1159: I2C-Compatible Interface on Cortex-M3 Based Precision Analog Microcontroller (ADuCxxx Family)
(pdf, 227 kB)
|CN0319: 14-Bit, 4-20 mA, Loop Powered, Ther mocouple Temperature Measurement System Using ARM Cortex-M3 (pdf, 343 kB)||Circuit Note|
|CN-0221: USB-Based Temperature Monitor Using the ADuCM360 Precision Analog Microcontroller and an External Thermocouple (pdf, 366 kB)||Circuit Note|
|UG-367: Using the ADuCM360/ADuCM361 Low Power, Precision Analog Microcontroller with Dual Sigma-Delta ADCs, ARM Cortex-M3 (pdf, 1642 kB)||User Guides|
|UG-457: ADuCM360 Development Systems Getting Started Tutorial (pdf, 995 kB)||User Guides|
|Glossary of EE Terms||Glossary||HTML|
|Title||Content Type||File Type|
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
|Utilities and Conversions||HTML|
|Development Tools||Software Configurable Products||HTML|
|ADuCM360/361 Power Calculator (xlsx, 41 kB)||Design Calculators||XLSX|
|ADuCM360/ADuCM361 Digital Filter Response Model (xlsx, 509 kB)||Design Tool||XLSX|
|ADuCM360/361 code examples and function libraries (zip, 1143 kB)||Code Examples||ZIP|
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