ADUCM361
RECOMMENDED FOR NEW DESIGNSLow Power Precision Analog Microcontroller, ARM Cortex M3 with single Sigma-Delta ADC
Part Details
- Analog input/output
- Single (24-bit) ADC
- 6 differential or 12 single-ended input channels
- Programmable Gain Amplifiers (PGA) (1-128)
- Flexible input MUX for input channel selection
- Buffers for external reference connection
- Programmable sensor excitation current sources
- On-chip precision voltage reference
- Single 12-bit voltage output DAC
- NPN mode for 4 mA to 20 mA 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
- 128 kB Flash/EE Memory, 8k Bytes SRAM
- In-circuit debug/download via Serial Wire and UART
- Power
- Operates directly from a 3.0V battery
- Power consumption
- MCU Active Mode: Core consumes 290μA / MHz
- Active Mode: 1.0mA (All peripherals active), core operating at 500KHz
- Supply Range: 1.8V to 3.6V (max)
- Power down mode: 4μA (WU Timer Active)
- On-chip peripheral
- UART, I2C and 2 x SPI serial I/O
- 16-bit PWM controller
- 19-pin multifunction GPIO Port
- See data sheet for additional features
- Package and temperature range
- 48-lead LFCSP (7mm x 7mm) package –40°C to 125°C
- Development tools
- Low cost QuickStart Development System
- Third-party compiler and emulator tool support
- Multiple functional safety features for improved diagnostics
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 PrecisionThe 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 PowerThe 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 UseOn-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
- Industrial
- Industrial Automation and Process Control
- 4 mA to 20 mA Loop-Powered Smart Sensor Systems
- Temperature Sensor
- Pressure Sensor
- Flow Meter
- Smart Transmitters
- Medical
- Portable Medical devices
- Patient monitoring
- Instrumentation
- Data Acquisition Modules
- Handheld Instruments
Documentation
Data Sheet 2
User Guide 3
Application Note 5
Technical Articles 1
Frequently Asked Question 1
Circuit Note 2
Webcast 2
This is the most up-to-date revision of the Data Sheet.
Software Resources
Evaluation Software 1
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| 4-20mA Current Loop D/A Converters 3 | ||
| AD5421 | PRODUCTION | 16-Bit, Serial Input, Loop-Powered, 4mA to 20mA DAC |
| AD5412 | PRODUCTION | Single Channel, 12-Bit, Current Source & Voltage Output DAC, HART Connectivity |
| AD5422 | PRODUCTION | Single Channel, 16-Bit, Current Source & Voltage Output DAC, HART Connectivity |
| Digital Temperature Sensors 1 | ||
| ADT7410 | PRODUCTION | ±0.5°C Accurate, 16-Bit Digital I2C Temperature Sensor |
| HART Interface Solutions 2 | ||
| AD5700 | PRODUCTION | Low Power HART Modem |
| AD5700-1 | PRODUCTION | Low Power HART Modem with Precision Internal Oscillator |
| Positive Linear Regulators (LDO) 1 | ||
| ADP1720 | PRODUCTION | 50 mA, High Voltage, Micropower Linear Regulator |
| RS-232 and RS-562 1 | ||
| ADM3202 | PRODUCTION | High-Speed, 2-Channel RS232/V.28 Interface Devices |
| USB Isolators 2 | ||
| ADUM3160 | PRODUCTION | Full/Low Speed USB Digital Isolator |
| ADUM4160 | PRODUCTION | Full/Low Speed USB Digital Isolator |
Tools & Simulations
Design Tool 2
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Open ToolEvaluation Kits
ADUCM360/361 DEVELOPMENT SYSTEM
Resources
Software
Reference Designs
USB - Based, Thermocouple Temperature Measurement System Using ARM Cortex - M3
Part Used
Design & Integration Tools
14-Bit, 4-20 mA, Loop Powered, Thermocouple Temperature Measurement System Using ARM Cortex-M3