®
MicroConverter, 12-Bit ADCs and DACs
with Embedded 62 kBytes Flash MCU
ADuC831
FEATURES
FUNCTIONAL BLOCK DIAGRAM
ANALOG I/O
8-Channel, 247 kSPS 12-Bit ADC
DC Performance: ꢀ1 LSB INL
AC Performance: 71 dB SNR
DMA Controller for High Speed ADC-to-RAM Capture
2 12-Bit (Monotonic) Voltage Output DACs
Dual Output PWM/ꢁ-ꢂ DACs
On-Chip Temperature Sensor Function ꢀ3ꢃC
On-Chip Voltage Reference
12-BIT
DAC
ADuC831
DAC
DAC
BUF
BUF
12-BIT
DAC
ADC0
ADC1
T/H
12-BIT ADC
16-BIT
ꢁ-ꢂ DAC
MUX
ADC5
16-BIT
ꢁ-ꢂ DAC
ADC6
ADC7
PWM0
PWM1
Memory
HARDWARE
CALIBRATON
MUX
62 kBytes On-Chip Flash/EE Program Memory
4 kBytes On-Chip Flash/EE Data Memory
Flash/EE, 100 Yr Retention, 100 kCycles Endurance
2304 Bytes On-Chip Data RAM
8051 Based Core
8051 Compatible Instruction Set (16 MHz Max)
12 Interrupt Sources, 2 Priority Levels
Dual Data Pointer
16-BIT
PWM
TEMP
SENSOR
16-BIT
PWM
8051-BASED MCU WITH ADDITIONAL
PERIPHERALS
62 kBYTES FLASH/EE PROGRAM MEMORY
4 kBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
Extended 11-Bit Stack Pointer
On-Chip Peripherals
3 ꢅ 16 BIT TIMERS
1 ꢅ REAL TIME CLOCK
POWER SUPPLY MON
WATCHDOG TIMER
INTERNAL
BAND GAP
VREF
OSC
2
PARALLEL
PORTS
UART,I C, AND SPI
Time Interval Counter (TIC)
SERIAL I/O
UART, I2C®, and SPI® Serial I/O
Watchdog Timer (WDT), Power Supply Monitor (PSM)
Power
V
XTAL1 XTAL2
REF
GENERAL DESCRIPTION
Specified for 3 V and 5 V Operation
Normal, Idle, and Power-Down Modes
Power-Down: 20 ꢄA @ 3 V
The ADuC831 is a fully integrated 247 kSPS data acquisition
system incorporating a high performance self-calibrating multi-
channel 12-bit ADC, dual 12-bit DACs, and programmable
8-bit MCU on a single chip.
APPLICATIONS
Optical Networking—Laser Power Control
Base Station Systems
Precision Instrumentation, Smart Sensors
Transient Capture Systems
DAS and Communications Systems
The microcontroller core is an 8052, and therefore 8051-
instruction-set compatible with 12 core clock periods per machine
cycle. 62 kBytes of nonvolatile Flash/EE program memory are
provided on-chip. Four kBytes of nonvolatile Flash/EE data
memory, 256 bytes RAM and 2 kBytes of extended RAM are
also integrated on-chip.
Pin compatible upgrade to existing ADuC812 systems
that require additional code or data memory. Runs
from 1 MHz–16 MHz to external crystal.
The ADuC831 also incorporates additional analog functionality
with two 12-bit DACs, power supply monitor, and a band gap
reference. On-chip digital peripherals include two 16-bit Σ-∆
DACs, dual output 16-bit PWM, watchdog timer, time interval
counter, three timers/counters, Timer 3 for baud rate generation
and serial I/O ports (I2C, SPI and UART).
The ADuC832 is also available. Functionally is the same
as the ADuC831, except the ADuC832 runs from a 32 kHz
external crystal with on-chip PLL.
On-chip factory firmware supports in-circuit serial download and
debug modes (via UART), as well as single-pin emulation mode
via the EA pin. The ADuC831 is supported by QuickStart™ and
QuickStart Plus development systems featuring low cost software
and hardware development tools. A functional block diagram of
the ADuC831 is shown above with a more detailed block diagram
shown in Figure 1.
MicroConverter is a registered trademark and QuickStart is a trademark
of Analog Devices, Inc.
SPI is a registered trademark of Motorola, Inc.
I2C is a registered trademark of Philips Corporation.
REV. 0
The part is specified for 3 V and 5 V operation over the extended
industrial temperature range, and is available in a 52-lead plastic
quad flatpack package and in a 56-lead chip scale package.
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2002. All rights reserved.
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