PRELIMINARY TECHNICAL DATA
MicroConverter, Dual 16-Bit ADCs
with Embedded 62kB FLASH MCU
a
Preliminary Technical Data
ADuC846
FEATURES
FUNCTIONAL BLOCK DIAGRAM
High Resolution Sigma-Delta ADCs
Two Independent ADCs (16-Bit Resolution)
16-Bit No Missing Codes
16-Bit rms (16 Bit p-p) Effective Resolution @ 20 Hz
Offset Drift 10 nV/°C, Gain Drift 0.5 ppm/°C
Memory
62 Kbytes On-Chip Flash/EE Program Memory
4 Kbytes On-Chip Flash/EE Data Memory
Flash/EE, 100 Year Retention, 100 Kcycles Endurance
3 Levels of Flash/EE Program Memory Security
In-Circuit Serial Download (No External Hardware)
High Speed User Download (5 Seconds)
2304 Bytes On-Chip Data RAM
8051-Based Core
8051 Compatible Instruction Set
High Performance Single Cycle Core
32 kHz External Crystal
On-Chip Programmable PLL (12.58 MHz Max)
3 × 16-Bit Timer/Counter
26 Programmable I/O Lines
11 Interrupt Sources, Two Priority Levels
GENERAL DESCRIPTION
Dual Data Pointer, Extended 11-Bit Stack Pointer
On-Chip Peripherals
The ADuC846 is a complete smart transducer front end, integrating
two high resolution sigma-delta ADCs, an 8-bit MCU, and
program/data Flash/EE memory on a single chip.
Internal Power on Reset Circuit
12-Bit Voltage Output DAC
Dual 16-Bit S-D DACs/PWMs
The two independent ADCs (primary and auxiliary) include a
temperature sensor and a PGA (allowing direct measurement of low
level signals). The ADCs with on-chip digital filtering and
programmable output data rates are intended for the measurement of
wide dynamic range, low frequency signals, such as those in weigh
scale, strain-gage, pressure transducer, or temperature measurement
applications.
On-Chip Temperature Sensor
Dual Excitation Current Sources
Time Interval Counter (Wakeup/RTC Timer)
®
2 ®
UART, SPI , and I C Serial I/O
High Speed Baud Rate Generator (incl 115,200)
Watchdog Timer (WDT)
Power Supply Monitor (PSM)
The device operates from a 32 kHz crystal with an on-chip PLL
generating a high frequency clock of 12.58 MHz. This clock is routed
through a programmable clock divider from which the MCU core
clock operating frequency is generated. The microcontroller core is an
optimized single cycle 8052 offering up to 12.58MIPs performance
while maintaining the 8051 instruction set compatibility.
Power
Normal: 2.3mA Max @ 3.6 V (Core CLK = 1.57 MHz)
Power-Down: 20µA Max with Wakeup Timer Running
Specified for 3 V and 5 V Operation
Package and Temperature Range
52-Lead MQFP (14 mm × 14 mm), –40°C to +125°C
56-Lead CSP (8 mm × 8 mm), –40°C to +85°C
APPLICATIONS
62 Kbytes of nonvolatile Flash/EE program memory, 4 Kbytes of
nonvolatile Flash/EE data memory, and 2304 bytes of data RAM are
provided on-chip. The program memory can be configured as data
memory to give up to 60 Kbytes of NV data memory in data logging
applications.
Intelligent Sensors
WeighScales
Portable Instrumentation, Battery Powered Systems
4-20mA Transmitters
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 ADuC846 is supported by a QuickStart™
development system featuring low cost software and hardware
development tools.
Data Logging
Precision System Monitoring
REV. PrA
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. 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
Fax: 781/326-8703
www.analog.com
© 2003 Analog Devices, Inc. All rights reserved.
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