ADuCM320i Data Sheet
GENERAL DESCRIPTION
The ADuCM320i is a fully integrated single package device that
incorporates high performance analog peripherals together
with digital peripherals controlled by an 80 MHz ARM®
Cortex™-M3 processor and integral flash for code and data.
The ADC on the ADuCM320i provides 14-bit, 1 MSPS data
acquisition on up to 16 input pins that can be programmed for
single-ended or differential operation. The voltage at the IDAC
output pins can also be measured by the ADC, which is useful for
controlling the power consumption of the current DACs.
Additionally, chip temperature and supply voltages can be
measured.
The ADC input voltage is 0 V to V
REF
. A sequencer is provided,
which allows a user to select a set of ADC channels to be measured
in sequence without software involvement during the sequence.
The sequence can optionally repeat automatically at a user
selectable rate.
Up to eight VDACs are provided with output ranges that are
programmable to one of two voltage ranges.
Four IDAC sources are provided. The output currents are
programmable with a range of 0 mA to 150 mA. A low drift
band gap reference and voltage comparator completes the
analog input peripheral set.
The ADuCM320i can be configured so that the digital and analog
outputs retain their output voltages and currents through a
watchdog or software reset sequence. Thus, a product can remain
functional even while the ADuCM320i is resetting itself.
The ADuCM320i has a low power ARM Cortex-M3 processor
and a 32-bit RISC machine that offers up to 100 MIPS peak
performance. Also integrated on chip are 2 × 128 kB Flash/EE
memory and 32 kB of SRAM. The flash comprises two separate
128 kB blocks supporting execution from one flash block and
simultaneous writing/erasing of the other flash block.
The ADuCM320i operates from an on-chip oscillator or a
16 MHz external crystal and a PLL at 80 MHz. This clock can
optionally be divided down to reduce current consumption.
Additional low power modes can be set via software. In normal
operating mode, the ADuCM320i digital core consumes about
300 µA per MHz.
The device includes an MDIO interface capable of operating at
up to 4 MHz. The capability to simultaneously execute from
one flash block and write/erase the other flash block makes the
ADuCM320i ideal for 10G, 40G, and 100G optical applications.
User programming is eased by incorporating PHYADR and
DEVADD hardware comparators. In addition, the nonerasable
kernel code plus flags in user flash provide assistance by
allowing user code to robustly switch between the two blocks
of user flash code and data spaces.
The ADuCM320i integrates a range of on-chip peripherals that
can be configured under software control, as required in the appli-
cation. These peripherals include 1 × UART, 2 × I
2
C, and 2 × SPI
serial input/output (I/O) communication controllers, GPIO,
32-element programmable logic array, 3 general-purpose timers,
plus a wake-up timer and system watchdog timer. A 16-bit
PWM with seven output channels is also provided.
GPIO pins on the device power up in high impedance input
mode. In output mode, the software chooses between open-
drain mode and push-pull mode. The pull-up resistors can be
disabled and enabled in software. In GPIO output mode, the
inputs can remain enabled to monitor the pins. The GPIO pins
can also be programmed to handle digital or analog peripheral
signals, in which case the pin characteristics are matched to the
specific requirement.
A large support ecosystem is available for the ARM Cortex-M3
processor to ease product development of the ADuCM320i.
Access is via the ARM serial wire debug port (SW-DP). On-chip
factory firmware supports in-circuit serial download via I
2
C.
These features are incorporated into a low cost QuickStart™
development system supporting this precision analog
microcontroller family.
Note that throughout this data sheet, multifunction pins, such
as VDAC0/P5.3, are referred to either by the entire pin name or
by a single function of the pin, for example, VDAC0, when only
that function is relevant.
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