®
MicroConverter 12-Bit ADCs and DACs with
Embedded High Speed 62-kB Flash MCU
ADuC841/ADuC842/ADuC843
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Pin compatable ugrade of ADuC812/ADuC831/ADuC832
12-BIT
DAC
DAC1
ADuC841/ADuC842/ADuC843
Increased performance
BUF
Single-cycle 20 MIPS 8052 core
High speed 420 kSPS 12-bit ADC
Increased memory
12-BIT
DAC
DAC1
BUF
ADC0
ADC1
T/H
12-BIT ADC
Up to 62 kBytes on-chip Flash/EE program memory
4 kBytes on-chip Flash/EE data memory
In-circuit reprogrammable
Flash/EE, 100 year retention, 100 kCycle endurance
2304 bytes on-chip data RAM
Smaller package
16-BIT
Σ-∆ DAC
MUX
ADC5
16-BIT
Σ-∆ DAC
ADC6
ADC7
PWM0
PWM1
HARDWARE
CALIBRATON
MUX
16-BIT
PWM
TEMP
SENSOR
8 mm × 8 mm chip scale package
52-lead PQFP—pin compatable upgrade
16-BIT
PWM
20 MIPS 8052 BASED MCU WITH ADDITIONAL
PERIPHERALS
Analog I/O
8-channel, 420 kSPS high accuracy, 12-bit ADC
On-chip, 15 ppm/°C voltage reference
DMA controller, high speed ADC-to-RAM capture
Two 12-bit voltage output DACs1
Dual output PWM ∑-∆ DACs
62 kBYTES FLASH/EE PROGRAM MEMORY
4 kBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
PLL2
OSC
3 × 16 BIT TIMERS
1× REAL TIME CLOCK
POWER SUPPLY MON
WATCHDOG TIMER
INTERNAL
BAND GAP
VREF
UART, I2C, AND SPI
SERIAL I/O
4 × PARALLEL
PORTS
On-chip temperature monitor function
C
XTAL1 XTAL2
REF
8052 based core
8051 compatible instruction set (20 MHz max)
High performance single-cycle core
Figure 1.
32 kHz external crystal, on-chip programmable PLL
12 interrupt sources, 2 priority levels
Dual data pointers, extended 11-bit stack pointer
GENERAL DESCRIPTION
The ADuC841/ADuC842/ADuC843 are complete smart
transducer front ends, that integrates a high performance self-
calibrating multichannel ADC, a dual DAC, and an optimized
single-cycle 20 MHz 8-bit MCU (8051 instruction set
compatible) on a single chip.
On-chip peripherals
Time interval counter (TIC)
UART, I2C®, and SPI® Serial I/O
Watchdog timer (WDT)
Power supply monitor (PSM)
The ADuC841 and ADuC842 are identical with the exception of
the clock oscillator circuit; the ADuC841 is clocked directly
from an external crystal up to 20 MHz whereas the ADuC842
uses a 32 kHz crystal with an on-chip PLL generating a
programmable core clock up to 16.78 MHz.
Power
Normal: 4.5 mA @ 3 V (core CLK = 2.098 MHz)
Power-down: 10 µA @ 3 V2
Development tools
Low cost, comprehensive development system
incorporating nonintrusive single-pin emulation,
IDE based assembly and C source debugging
The ADuC843 is identical to the ADuC842 except that the
ADuC843 has no analog DAC outputs.
APPLICATIONS
Optical networking—laser power control
Base station systems
Precision instrumentation, smart sensors
Transient capture systems
The microcontroller is an optimized 8052 core offering up to
20 MIPS peak performance. Three different memory options
are available offering up to 62 kBytes of nonvolatile Flash/EE
program memory. Four kBytes of nonvolatile Flash/EE data
memory, 256 bytes RAM, and 2 kBytes of extended RAM are
also integrated on-chip.
DAS and communications systems
1 ADuC841/ADuC842 only.
2 ADuC842/ADuC843 only, ADuC841 driven directly by external crystal.
(continued on page 15)
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. 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 owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
www.analog.com
© 2003 Analog Devices, Inc. All rights reserved.
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