Low Power, Precision Analog Microcontroller
with Dual Sigma-Delta ADCs, ARM Cortex-M3
Data Sheet
FEATURES
Pin compatible with the
ADuCM360/ADuCM361
Analog input/output
Dual 24-bit ADCs (ADuCM362)
Single 24-bit ADC (ADuCM363)
Programmable ADC output rate (3.5 Hz to 3.906 kHz)
Simultaneous 50 Hz/60 Hz noise rejection
At 50 SPS continuous conversion mode
At 16.67 SPS single conversion mode
Flexible input mux for input channel selection to both ADCs
Two 24-bit multichannel ADCs (ADC0 and ADC1)
6 differential or 12 single-ended input channels
4 internal channels for monitoring DAC, temperature
sensor, IOVDD/4, and AVDD/4 (ADC1 only)
Programmable gain (1 to 128)
Gain of 1 with input buffer on/off supported
RMS noise: 52 nV at 3.53 Hz, 200 nV at 50 Hz
Programmable sensor excitation current sources
On-chip precision voltage reference
Two external reference options supported by both ADCs
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 wake-up timer
16 MHz oscillator with 8-way programmable divider
Memory
Up to 256 kB Flash/EE memory, 24 kB SRAM
In-circuit debug/download via serial wire and UART
ADuCM362/ADuCM363
Power supply range: 1.8 V to 3.6 V (maximum)
Power consumption, MCU active mode
Core consumes 290 μA/MHz
Overall system current consumption of 1.0 mA with core
operating at 500 kHz (both ADCs on, input buffers off,
PGA gain of 4, one SPI port on, and all timers on)
Power consumption, power-down mode: 4 μA (wake-up
timer active)
On-chip peripherals
2× UART, I
2
C, and 2 × SPI serial input/output (I/O)
16-bit pulse-width modulation (PWM) controller
19-pin multifunction GPIO port
2 general-purpose timers
Wake-up timer/watchdog timer
Multichannel DMA and interrupt controller
DMA support for both SPI channels
Package and temperature range
48-lead, 7 mm × 7 mm LFCSP
Specified for −40°C to +125°C operation
Development tools
Low cost QuickStart Development System
Third-party compiler and emulator tool support
Multiple diagnostic functions that support SIL certification
APPLICATIONS
Industrial automation and process control
Intelligent precision sensing systems
4 mA to 20 mA loop-powered smart sensor systems
Medical devices, patient monitoring
Rev. 0
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ADuCM362/ADuCM363
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Revision History ............................................................................... 2
General Description ......................................................................... 3
Functional Block Diagrams ............................................................. 4
Specifications..................................................................................... 6
Microcontroller Electrical Specifications .................................. 6
RMS Noise Resolution of ADC0 and ADC1 .......................... 11
I
2
C Timing Specifications .......................................................... 15
Data Sheet
SPI Timing Specifications ......................................................... 16
Absolute Maximum Ratings ......................................................... 18
Thermal Resistance .................................................................... 18
ESD Caution................................................................................ 18
Pin Configuration and Function Descriptions........................... 19
Typical Performance Characteristics ........................................... 22
Typical System Configuration ...................................................... 23
Outline Dimensions ....................................................................... 24
Ordering Guide .......................................................................... 24
REVISION HISTORY
10/2016—Revision 0: Initial Version
Rev. 0| Page 2 of 24
Data Sheet
GENERAL DESCRIPTION
The
ADuCM362/ADuCM363
are fully integrated, 3.9 kSPS,
24-bit data acquisition systems that incorporate dual, high
performance, multichannel sigma-delta (Σ-Δ) analog-to-digital
converters (ADCs), a 32-bit ARM Cortex™-M3 processor, and
Flash/EE memory on a single chip. The
ADuCM362/
ADuCM363
are designed for direct interfacing to external
precision sensors in both wired and battery-powered applications.
The
ADuCM363
contains all the features of the
ADuCM362,
except that only one 24-bit Σ-Δ ADC (ADC1) is available.
The
ADuCM362/ADuCM363
contain an on-chip 32 kHz
oscillator and an internal 16 MHz high frequency oscillator. The
high frequency oscillator is routed through a programmable clock
divider from which the operating frequency of the processor core
clock is generated. The maximum core clock speed is 16 MHz;
this speed is not limited by operating voltage or temperature.
The microcontroller core is a low power ARM Cortex-M3
processor, a 32-bit RISC machine that offers up to 20 MIPS peak
performance. The Cortex-M3 processor incorporates a flexible,
11-channel DMA controller that supports all wired communica-
tion peripherals (both SPIs, both UARTs, and I
2
C). Also
integrated on chip are up to 256 kB of nonvolatile Flash/EE
memory and 24 kB of SRAM.
The analog subsystem 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, diagnostic current
sources, and a bias voltage generator of AVDD_REG/2 (900 mV)
to set the common-mode voltage of an input channel. A low-side
internal ground switch is provided to allow power-down of an
external circuit (for example, a bridge circuit) between conversions.
Optional input buffers are provided for the analog inputs and the
external reference inputs. These buffers can be enabled for all PGA
gain settings.
The ADCs contain two parallel filters: a sinc3 or sinc4 filter in
parallel with a sinc2 filter. The sinc3 or sinc4 filter is used for
precision measurements. The sinc2 filter is used for fast measure-
ments and for the detection of step changes in the input signal.
ADuCM362/ADuCM363
The devices contain a low noise, low drift internal band gap
reference, but they can be configured to accept one or two
external reference sources in ratiometric measurement config-
urations. An option to buffer the external reference inputs is
provided on chip. A single-channel buffered voltage output
DAC is also provided on chip.
The
ADuCM362/ADuCM363
integrate a range of on-chip
peripherals, which can be configured under microcontroller
software control as required in the application. The peripherals
include two UARTs, I
2
C, and dual SPI serial I/O communication
controllers; a 19-pin GPIO port; two general-purpose timers;
a wake-up timer; and a system watchdog timer. A 16-bit PWM
controller with six output channels is also provided.
The
ADuCM362/ADuCM363
are 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 that consumes 290 μA/MHz (including flash/
SRAM I
DD
). An overall system current consumption of 1 mA can
be achieved with both ADCs on (input buffers off), PGA gain of
4, one SPI port on, and all timers on.
The
ADuCM362/ADuCM363
can be configured in a number of
low power operating modes under direct program control,
including a hibernate mode (internal wake-up timer active) that
consumes only 4 μA. In hibernate mode, peripherals, such as
external interrupts or the internal wake-up timer, can wake up
the devices. This mode allows the devices to operate with ultralow
power while still responding 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; non-
intrusive emulation is also supported via the serial wire interface.
These features are incorporated into a low cost QuickStart™
Development System that supports this precision analog micro-
controller family.
The devices operate from an external 1.8 V to 3.6 V voltage
supply and are specified over an industrial temperature range of
−40°C to +125°C.
Rev. 0 | Page 3 of 24
ADuCM362/ADuCM363
FUNCTIONAL BLOCK DIAGRAMS
DAC
AVDD
AGND
BUFFER
V
BIAS
GENERATOR
ON-CHIP
OSCILLATOR
(1% TYP)
16MHz
12-BIT
DAC
ON-CHIP
1.8V ANALOG
LDO
ON-CHIP
1.8V DIGITAL
LDO
POWER-ON
RESET
Data Sheet
RESET
XTALO
XTALI
AIN0
AIN1
AIN2
AIN3
AIN4/IEXC
AIN5/IEXC
AIN6/IEXC
AIN7/VBIAS0/IEXC/
EXTREF2IN+
AIN8/EXTREF2IN–
AIN9/DACBUFF+
AIN10
AIN11/VBIAS1
MUX
V
REF
24-BIT
Σ-∆
ADC
SINC3/
SINC4
FILTER
ARM
CORTEX-M3
PROCESSOR
16MHz
AMP
BUF
MOD2
GAIN
Σ-∆
MODULATOR
GPIO PORTS
UART PORTS
2 × SPI PORTS
I
2
C PORTS
TIMER0
TIMER1
WATCHDOG
WAKE-UP TIMER
PWM
SERIAL WIRE
DEBUG,
PROGRAMMING
AND DEBUG
19 GENERAL-
PURPOSE
I/O PORTS
SINC2
FILTER
V
REF
24-BIT
Σ-∆
ADC
SINC3/
SINC4
FILTER
MEMORY
256kB FLASH
24kB SRAM
AMP
BUF
MOD2
GAIN
Σ-∆
MODULATOR
DMA AND
INTERRUPT
CONTROLLER
DAC, TEMP,
IOVDD/4,
AVDD/4
SELECTABLE
V
REF
SOURCES
PRECISION
REFERENCE
SWDIO
SWCLK
ADuCM362
DVDD_REG
AVDD_REG
IREF
CURRENT
SOURCES
BUFFER
BUFFER
GND_SW
VREF– VREF+
INT_REF
IOVDD
IOVDD
Figure 1.
ADuCM362
Functional Block Diagram
Rev. 0| Page 4 of 24
14919-001
Data Sheet
DAC
AVDD
AGND
BUFFER
V
BIAS
GENERATOR
12-BIT
DAC
ON-CHIP
1.8V ANALOG
LDO
ON-CHIP
1.8V DIGITAL
LDO
ADuCM362/ADuCM363
POWER-ON
RESET
RESET
AIN0
AIN1
AIN2
AIN3
AIN4/IEXC
AIN5/IEXC
AIN6/IEXC
AIN7/VBIAS0/IEXC/
EXTREF2IN+
AIN8/EXTREF2IN–
AIN9/DACBUFF+
AIN10
AIN11/VBIAS1
MUX
V
REF
SINC2
FILTER
24-BIT
Σ-∆
ADC
SINC3/
SINC4
FILTER
ARM
CORTEX-M3
PROCESSOR
16MHz
ON-CHIP
OSCILLATOR
(1% TYP)
16MHz
XTALO
XTALI
GPIO PORTS
UART PORTS
2 × SPI PORTS
I
2
C PORTS
TIMER0
TIMER1
WATCHDOG
WAKE-UP TIMER
PWM
SERIAL WIRE
DEBUG,
PROGRAMMING
AND DEBUG
19 GENERAL-
PURPOSE
I/O PORTS
MEMORY
256kB FLASH
24kB SRAM
AMP
BUF
MOD2
GAIN
Σ-∆
MODULATOR
DMA AND
INTERRUPT
CONTROLLER
DAC, TEMP,
IOVDD/4,
AVDD/4
SELECTABLE
V
REF
SOURCES
PRECISION
REFERENCE
SWDIO
SWCLK
ADuCM363
DVDD_REG
AVDD_REG
IREF
CURRENT
SOURCES
BUFFER
BUFFER
GND_SW
VREF– VREF+
INT_REF
IOVDD
IOVDD
Figure 2.
ADuCM363
Functional Block Diagram
Rev. 0 | Page 5 of 24
14919-014
