ADUCM360 AD [Analog Devices], ADUCM360 Datasheet - Page 4

• Manufacturer Part Number: ADUCM360
• Description: Low Power Precision Analog Microcontroller
• Manufacturer: AD [Analog Devices]

ADuCM360/ADuCM361
GENERAL DESCRIPTION
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/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, I
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.
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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°C to
125°C.
Preliminary Technical Data