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參數資料
| 型號： | USB-EA-CONVZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 1/68頁 |
| 文件大?。?/td> | 0K |
| 描述： | SUPPORT BOARD ADUC8XX |
| 標準包裝： | 1 |
| 類型： | 仿真器 |
| 適用于相關產品： | ADuC8xx |
| 所含物品： | 模塊 |
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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
ADuC824
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Analog Devices, Inc., 2002
MicroConverter, Dual-Channel
16-/24-Bit ADCs with Embedded FLASH MCU
FEATURES
High Resolution Sigma-Delta ADCs
Two Independent ADCs (16- and 24-Bit Resolution)
Programmable Gain Front End
24-Bit No Missing Codes, Primary ADC
13-Bit p-p Resolution @ 20 Hz, 20 mV Range
18-Bit p-p Resolution @ 20 Hz, 2.56 V Range
Memory
8 KB On-Chip Flash/EE Program Memory
640 Bytes On-Chip Flash/EE Data Memory
Flash/EE, 100 Year Retention, 100 Kcycles Endurance
256 Bytes On-Chip Data RAM
8051-Based Core
8051-Compatible Instruction Set (12.58 MHz Max)
32 kHz External Crystal, On-Chip Programmable PLL
Three 16-Bit Timer/Counters
26 Programmable I/O Lines
11 Interrupt Sources, Two Priority Levels
Power
Specified for 3 V and 5 V Operation
Normal: 3 mA @ 3 V (Core CLK = 1.5 MHz)
Power-Down: 20
A (32 kHz Crystal Running)
On-Chip Peripherals
On-Chip Temperature Sensor
12-Bit Voltage Output DAC
Dual Excitation Current Sources
Reference Detect Circuit
Time Interval Counter (TIC)
UART Serial I/O
I2C-Compatible and SPI Serial I/O
Watchdog Timer (WDT), Power Supply Monitor (PSM)
APPLICATIONS
Intelligent Sensors (IEEE1451.2-Compatible)
Weigh Scales
Portable Instrumentation
Pressure Transducers
4–20 mA Transmitters
MicroConverter is a registered trademark of Analog Devices, Inc.
SPI is a registered trademark of Motorola, Inc.
I
2C is a registered trademark of Philips Semiconductors, Inc.
GENERAL DESCRIPTION
The ADuC824 is a complete smart transducer front-end, inte-
grating two high-resolution sigma delta ADCs, an 8-bit MCU,
and program/data Flash/EE Memory on a single chip. This low
power device accepts low-level signals directly from a transducer.
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 are
intended for the measurement of wide dynamic range, low-frequency
signals, such as those in weigh scale, strain-gauge, pressure trans-
ducer, or temperature measurement applications. The ADC output
data rates are programmable and the ADC output resolution will
vary with the programmed gain and output rate.
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,
in turn, 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. The microcontroller core machine cycle consists
of 12 core clock periods of the selected core operating frequency.
8 Kbytes of nonvolatile Flash/EE program memory are provided
on-chip. 640 bytes of nonvolatile Flash/EE data memory and
256 bytes RAM are also integrated on-chip.
The ADuC824 also incorporates additional analog functionality
with a 12-bit DAC, current sources, power supply monitor,
and a bandgap reference. On-chip digital peripherals include a
watchdog timer, time interval counter, three timers/counters,
and three serial I/O ports (SPI, UART, and I
2C-compatible).
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. A functional block diagram of the ADuC824 is
shown above with a more detailed block diagram shown in
Figure 12.
The part operates from a single 3 V or 5 V supply. When operating
from 3 V supplies, the power dissipation for the part is below
10 mW. The ADuC824 is housed in a 52-lead MQFP package.
FUNCTIONAL BLOCK DIAGRAM
8 KBYTES FLASH/EE PROGRAM MEMORY
640 BYTES FLASH/EE DATA MEMORY
256 BYTES USER RAM
3
16 BIT
TIMER/COUNTERS
1
TIME INTERVAL
COUNTER
4
PARALLEL
PORTS
8051-BASED MCU WITH ADDITIONAL
PERIPHERALS
ON-CHIP MONITORS
POWER SUPPLY
MONITOR
WATCHDOG TIMER
I2C-COMPATIBLE
UART AND SPI
SERIAL I/O
PGA
ADuC824
PROG.
CLOCK
DIVIDER
XTAL2
XTAL1
BUF
AVDD
AGND
MUX
TEMP
SENSOR
REFIN+
REFIN–
EXTERNAL
VREF
DETECT
INTERNAL
BANDGAP
VREF
AIN1
AIN2
AIN3
AIN4
AIN5
AUXILIARY
16-BIT
-
ADC
PRIMARY
24-BIT
-
ADC
MUX
OSC
AND
PLL
12-BIT
VOLTAGE O/P
DAC
BUF
CURRENT
SOURCE
MUX
AVDD
IEXC1
IEXC2
DAC
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