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Analog Devices ADuC812 User Manual

Aduc812, Microconverter, Multichannel 12-bit adc with embedded flash mcu

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REV. B

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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.

a

ADuC812

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., 2001

MicroConverter

®

, Multichannel

12-Bit ADC with Embedded FLASH MCU

FUNCTIONAL BLOCK DIAGRAM

MICROCONTROLLER

8051 BASED

MICROCONTROLLER CORE

POWER SUPPLY

MONITOR

WATCHDOG

TIMER

2-WIRE

SERIAL I/O

640

؋ 8 USER

FLASH EEPROM

256

؋ 8 USER

RAM

SPI

12-BIT

SUCCESSIVE

APPROXIMATION

ADC

ADC

CONTROL

AND

CALIBRATION

LOGIC

T/H

TEMP

SENSOR

2.5V
REF

AIN

MUX

BUF

DAC0

MOSI/

SDATA

MISO

(P3.3)

SCLOCK

TxD

(P3.1)

RxD

(P3.0)

XTAL2

XTAL1

DGND

DV

DD

AGND

AV

DD

DAC0

DAC1

T0 (P3.4)

T1 (P3.5)

T2 (P1.0)

T2EX (P1.1)

INT0 (P3.2)
INT1 (P3.3)

ALE

PSEN
EA

RESET

ADuC812

P3.0–P3.7

P2.0–P2.7

P1.0–P1.7

P0.0–P0.7

AIN0 (P1.0)–AIN7 (P1.7)

V

REF

UART

8K

؋ 8 PROGRAM

FLASH EEPROM

DAC

CONTROL

3

؋ 16-BIT

TIMER/COUNTERS

OSC

MUX

DAC1

BUF

C

REF

BUF

FEATURES
ANALOG I/O

8-Channel, High Accuracy 12-Bit ADC
On-Chip, 100 ppm/

؇C Voltage Reference

High-Speed 200 kSPS
DMA Controller for High-Speed ADC-to-RAM Capture
Two 12-Bit Voltage Output DACs
On-Chip Temperature Sensor Function

MEMORY

8K Bytes On-Chip Flash/EE Program Memory
640 Bytes On-Chip Flash/EE Data Memory
256 Bytes On-Chip Data RAM
16M Bytes External Data Address Space
64K Bytes External Program Address Space

8051-COMPATIBLE CORE

12 MHz Nominal Operation (16 MHz Max)
Three 16-Bit Timer/Counters
High Current Drive Capability—Port 3
Nine Interrupt Sources, Two Priority Levels

POWER

Specified for 3 V and 5 V Operation
Normal, Idle, and Power-Down Modes

ON-CHIP PERIPHERALS

UART Serial I/O
2-Wire (I

2

C

®

-Compatible) and SPI

®

Serial I/O

Watchdog Timer
Power Supply Monitor

APPLICATIONS
Intelligent Sensors Calibration and Conditioning
Battery Powered Systems (Portable PCs, Instruments,

Monitors)

Transient Capture Systems
DAS and Communications Systems
Control Loop Monitors (Optical Networks/Base Stations)

GENERAL DESCRIPTION
The ADuC812 is a fully integrated 12-bit data acquisition system
incorporating a high performance self calibrating multichannel
ADC, dual DAC and programmable 8-bit MCU (8051 instruc-
tion set compatible) on a single chip.

The programmable 8051-compatible core is supported by 8K
bytes Flash/EE program memory, 640 bytes Flash/EE data
memory and 256 bytes data SRAM on-chip.

Additional MCU support functions include Watchdog Timer,
Power Supply Monitor and ADC DMA functions. 32 Pro-
grammable I/O lines, I

2

C-compatible, SPI and Standard UART

Serial Port I/O are provided for multiprocessor interfaces and
I/O expansion.

Normal, idle, and power-down operating modes for both the
MCU core and analog converters allow for flexible power man-
agement schemes suited to low power applications. The part is
specified for 3 V and 5 V operation over the industrial tem-
perature range and is available in a 52-lead, plastic quad
flatpack package.

MicroConverter is a registered trademark of Analog Devices, Inc.
I

2

C is a registered trademark of Philips Corporation.

SPI is a registered trademark of Motorola Inc.

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