Analog Devices Inc. ADuCM36x ARM Cortex-M3 MCUs

Analog Devices ADuCM36x Microcontrollers (MCUs) provide a fully integrated, 3.9kSPS, 24-bit data acquisition system. These MCUs incorporate high-performance sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), a 32-bit ARM Cortex™-M3 processor. The ADuCM36x devices also include an on-chip 32kHz oscillator and an internal 16MHz high-frequency oscillator. The ADuCM36x integrates on-chip peripherals such as the UART, I²C, and dual SPI serial I/O communication controllers. Additional peripherals include a 16-bit PWM with 6 output channels, 19-pin GPIO ports, 2 general-purpose timers, a wake-up timer, and a system watchdog timer.

Designers can configure the microcontroller in a normal operating mode that consumes 290μA/MHz (including flash/SRAM IDD). The normal operating mode results in an overall system current consumption of 1mA when all peripherals are active. With its low-power operation, the ADuCM36x MCUs are ideally suited to operate in battery-powered applications where low-power operation is critical.

Features

Analog input/output
- Programmable ADC output rate (3.5Hz to 3.906kHz)
- Simultaneous 50Hz/60Hz noise rejection
  - At 50SPS continuous conversion mode
  - At 16.67SPS single conversion mode
- Flexible input mux for input channel selection to both ADCs
- Two 24-bit multi-channel ADCs (ADC0 and ADC1)
  - 6 differential or 11 single-ended input channels
  - 4 internal channels for monitoring DAC, temperature sensor, IOVDD/4, and AVDD/4 (ADC1 only)
  - RMS noise: 52nV at 3.53Hz, 200nV at 50Hz
- Programmable sensor excitation current sources
- On-chip precision voltage reference
- Single 12-bit voltage output DAC
- NPN mode for 4mA to 20mA loop applications
Microcontroller
- ARM Cortex-M3 32-bit processor
- Serial wire download and debug
- Internal watch crystal for wake-up timer
- 16MHz oscillator with 8-way programmable divider
Power
- Power supply range: 1.8V to 3.6V (maximum)
- Power consumption, MCU active mode
  - Core consumes 290μA/MHz
  - Overall system current consumption of 1.0mA with core operating at 500kHz
- Power consumption, power-down mode: 4μA (wake-up timer active)

On-chip peripherals
- UART, I²C, and 2 × SPI serial I/O
- 16-bit PWM controller with 6 output channels
- 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, 7mm × 7mm LFCSP
- Specified for −40°C to +125°C operation
Memory
- In-circuit debug/download via serial wire and UART
Development tools
- QuickStart Development System
- Third-party compiler and emulator tool support
- Multiple functional safety features for improved diagnostics
Applications
- Industrial automation and process control
- Intelligent precision sensing systems
- 4mA to 20mA loop-powered smart sensor systems
- Medical devices, patient monitoring