ADUC834_02 Datasheet, PDF (1/80 Pages) Analog Devices – MicroConverter, Dual 16-Bit/24-Bit ADCs with Embedded 62 kB Flash MCU

a MicroConverter®, Dual 16-Bit/24-Bit ⌺-⌬
ADCs with Embedded 62 kB Flash MCU
ADuC834
FEATURES
High Resolution ⌺-⌬ ADCs
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/؇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
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
Dual Data Pointer, Extended 11-Bit Stack Pointer
On-Chip Peripherals
Internal Power on Reset Circuit
12-Bit Voltage Output DAC
Dual 16-Bit ⌺-⌬ DACs/PWMs
On-Chip Temperature Sensor
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 ␮A Max with Wake-Up 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 LFCSP (8 mm ؋ 8 mm), –40؇C to +85؇C
APPLICATIONS
Intelligent Sensors
Weigh Scales
Portable Instrumentation, Battery-Powered Systems
4–20 mA Transmitters
Data Logging
Precision System Monitoring
REV. 0
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FUNCTIONAL BLOCK DIAGRAM
AIN1
AIN2
AIN3
AIN4
AIN5
REFIN–
REFIN+
RESET
DV_DD
DGND
AV_DD
ADuC834
MUX
BUF
PGA
PRIMARY
24-BIT ⌺-⌬ ADC
AV_DD
CURRENT
SOURCE
12-BIT
DAC
BUF
IEXC1
IEXC2
DAC
MUX
AGND
TEMP
SENSOR
AUXILIARY
16-BIT ⌺-⌬ ADC
DUAL
16-BIT
⌺-⌬ DAC
DUAL
16-BIT
PWM
MUX
EXTERNAL
VREF
DETECT
INTERNAL
BAND GAP
VREF
POR
8051-BASED MCU WITH ADDITIONAL
PERIPHERALS
62 KBYTES FLASH/EE PROGRAM MEMORY
4 KBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
PLL AND PROG
CLOCK DIV
3 ؋ 16 BIT TIMERS POWER SUPPLY MON
BAUD R ATE TIMER WATCHDOG TIMER
OSC
WAKE- UP/
RTC TIMER
4 ؋ PARALLEL
PORTS
UART, SPI, AND I²C
SERIAL I/O
PWM0
PWM1
XTAL1 XTAL2
GENERAL DESCRIPTION
The ADuC834 is a complete smart transducer front end,
integrating two high resolution ⌺-⌬ ADCs, an 8-bit MCU, and
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.
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.
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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone] © 2002 Analog Devices, Inc. All rights reserved.