®
MicroConverter , Dual 16-Bit/24-Bit ꢀ-ꢁ
a
ADCs with Embedded 62 kB Flash MCU
ADuC834
FEATURES
FUNCTIONAL BLOCK DIAGRAM
High Resolution ꢀ-ꢁ ADCs
AV
DD
2 Independent ADCs (16-Bit and 24-Bit Resolution)
24-Bit No Missing Codes, Primary ADC
21-Bit rms (18.5-Bit p-p) Effective Resolution @ 20 Hz
Offset Drift 10 nV/ꢃC, Gain Drift 0.5 ppm/ꢃC
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
ADuC834
AV
DD
IEXC1
IEXC2
CURRENT
SOURCE
AIN1
AIN2
PRIMARY
24-BITꢀ-ꢁ ADC
BUF
PGA
MUX
MUX
12-BIT
DAC
BUF
DAC
AIN3
AIN4
AIN5
AGND
DUAL
16-BIT
ꢀ-ꢁDAC
AUXILIARY
16-BITꢀ-ꢁ ADC
PWM0
PWM1
MUX
TEMP
SENSOR
DUAL
16-BIT
PWM
EXTERNAL
INTERNAL
BAND GAP
REFIN–
REFIN+
V
REF
DETECT
V
REF
8051-BASED MCU WITH ADDITIONAL
PERIPHERALS
RESET
62 KBYTES FLASH/EE PROGRAM MEMORY
4 KBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
8051-Based Core
8051 Compatible Instruction Set
32 kHz External Crystal
DV
DD
POR
3 ꢂ 16 BIT TIMERS
BAUDRATE TIMER
POWER SUPPLY MON
WATCHDOG TIMER
DGND
PLL AND PROG
CLOCK DIV
On-Chip Programmable PLL (12.58 MHz Max)
3 ꢂ 16-Bit Timer/Counter
UART, SPI, AND I2C
SERIAL I/O
4 ꢂ PARALLEL
PORTS
WAKE-UP/
RTC TIMER
OSC
26 Programmable I/O Lines
XTAL1 XTAL2
11 Interrupt Sources, Two Priority Levels
Dual Data Pointer, Extended 11-Bit Stack Pointer
On-Chip Peripherals
Internal Power on Reset Circuit
12-Bit Voltage Output DAC
GENERAL DESCRIPTION
The ADuC834 is a complete smart transducer front end,
integrating two high resolution ⌺-⌬ ADCs, an 8-bit MCU, and
Dual 16-Bit ꢀ-ꢁ DACs/PWMs
On-Chip Temperature Sensor
program/data Flash/EE memory on a single chip.
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.
Dual Excitation Current Sources
Time Interval Counter (Wake-Up/RTC Timer)
UART, SPI®, and I2C® Serial I/O
High Speed Baud Rate Generator (Including 115,200)
Watchdog Timer (WDT)
Power Supply Monitor (PSM)
Power
Normal: 2.3 mA Max @ 3.6 V (Core CLK = 1.57 MHz)
Power-Down: 20 ꢄA Max with Wake-Up Timer Running
Specified for 3 V and 5 V Operation
Package and Temperature Range
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 8052 and therefore 8051 instruction set compatible
with 12 core clock periods per machine cycle.
52-Lead MQFP (14 mm
56-Lead LFCSP (8 mm
ꢂ
14 mm), –40
ꢃC to +125ꢃC
ꢂ
8 mm), –40 C to +85ꢃC
ꢃ
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.
APPLICATIONS
Intelligent Sensors
Weigh Scales
Portable Instrumentation, Battery-Powered Systems
4–20 mA Transmitters
Data Logging
Precision System Monitoring
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 ADuC834 is supported by a QuickStart™
development system featuring low cost software and hardware
development tools.
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, 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
Fax: 781/326-8703
www.analog.com
© 2002 Analog Devices, Inc. All rights reserved.
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