a
MicroConverter ®, Multichannel
12-Bit ADC with Embedded Flash MCU
ADuC812
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
2 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)
3 16-Bit Timer/Counters
High Current Drive Capability—Port 3
9 Interrupt Sources, 2 Priority Levels
Power
Specified for 3 V and 5 V Operation
Normal, Idle, and Power-Down Modes
On-Chip Peripherals
UART and SPI® Serial I/O
2-Wire (400 kHz I2C® Compatible) 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 instruction 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. Thirty-two
programmable I/O lines, I2C 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 flexible power management schemes suited to low power applications. The part is
specified for 3 V and 5 V operation over the industrial temperature range and is available in a 52-lead, plastic quad
flatpack package, and in a 56-lead, chip scale package.
FUNCTIONAL BLOCK DIAGRAM
P0.0–P0.7
AIN0 (P1.0)–AIN7 (P1.7)
AIN
MUX
P1.0–P1.7
ADC
CONTROL
AND
CALIBRATION
LOGIC
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
T/H
P3.0–P3.7
P2.0–P2.7
DAC0
BUF
DAC0
DAC1
BUF
DAC1
DAC
CONTROL
T0 (P3.4)
MICROCONTROLLER
2.5V
REF
VREF
8051 BASED
MICROCONTROLLER CORE
8K ؋ 8 PROGRAM
FLASH EEPROM
BUF
WATCHDOG
TIMER
640 ؋ 8 USER
FLASH EEPROM
TEMP
SENSOR
POWER SUPPLY
MONITOR
UART
256 ؋ 8 USER
RAM
ADuC812
CREF
3 ؋ 16-BIT
TIMER/COUNTERS
2-WIRE
SERIAL I/O
SPI
MUX
T1 (P3.5)
T2 (P1.0)
T2EX (P1.1)
INT0 (P3.2)
INT1 (P3.3)
ALE
PSEN
OSC
EA
RESET
AVDD
AGND
DVDD
DGND
XTAL1 XTAL2 RxD TxD SCLOCK MOSI/ MISO
(P3.0) (P3.1)
SDATA (P3.3)
REV. F
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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. Trademarks and
registered trademarks are the property of their respective companies.
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Fax: 781/461-3113
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