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Analog Devices Semiconductor Electronic Components Datasheet

ADuC845 Datasheet

24-/16-Bit ADCs

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Data Sheet
FEATURES
High resolution Σ-Δ ADCs
2 independent 24-bit ADCs on the ADuC845
Single 24-bit ADC on the ADuC847 and
single 16-bit ADC on the ADuC848
Up to 10 ADC input channels on all devices
24-bit no missing codes
22-bit rms (19.5 bit p-p) effective resolution
Offset drift 10 nV/°C, gain drift 0.5 ppm/°C chop enabled
Memory
62-kbyte on-chip Flash/EE program memory
4-kbyte on-chip Flash/EE data memory
Flash/EE, 100-year retention, 100 kcycle endurance
3 levels of Flash/EE program memory security
In-circuit serial download (no external hardware)
High speed user download (5 sec)
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
24 programmable I/O lines, plus 8 analog or
digital input 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 Σ-Δ DACs
On-chip temperature sensor (ADuC845 only)
Dual excitation current sources (200 μA)
Time interval counter (wake-up/RTC timer)
UART, SPI®, and I2C® serial I/O
High speed dedicated baud rate generator (incl. 115,200)
Watchdog timer (WDT)
Power supply monitor (PSM)
MicroConverter® Multichannel
24-/16-Bit ADCs with Embedded 62 kB
Flash and Single-Cycle MCU
ADuC845/ADuC847/ADuC848
Power
Normal: 4.8 mA max at 3.6 V (core CLK = 1.57 MHz)
Power-down: 20 μA 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
Multichannel sensor monitoring
Industrial/environmental instrumentation
Weigh scales, pressure sensors, temperature monitoring
Portable instrumentation, battery-powered systems
Data logging, precision system monitoring
AIN1
AIN10
AINCOM
REFIN2+
REFIN2–
REFIN–
REFIN+
RESET
DVDD
DGND
FUNCTIONAL BLOCK DIAGRAM
AVCO
ADuC845
AVDD
CURRENT
SOURCE
MUX
BUF
PGA
PRIMARY
24-BIT -ADC
12-BIT
DAC
BUF
AGND
TEMP
SENSOR
AUXILIARY
24-BIT -ADC
DUAL 16-BIT
-DAC
DUAL 16-BIT
PWM
MUX
IEXC1
IEXC2
DAC
PWM0
PWM1
EXTERNAL
VREF
DETECT
INTERNAL
BAND GAP
VREF
SINGLE-CYCLE 8061-BASED MCU
POR
OSC
PLL AND PRG
CLOCK DIV
WAKE-UP/
RTC TIMER
62 kBYTES FLASH/EE PROGRAM MEMORY
4 kBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
3 16 BIT TIMERS
BAUD RATE TIMER
POWER SUPPLY MON
WATCHDOG TIMER
4 PARALLEL
PORTS
UART, SPI, AND I 2C
SERIAL I/O
XTAL1 XTAL2
Figure 1. ADuC845 Functional Block Diagram
Rev. D
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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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2004–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

ADuC845 Datasheet

24-/16-Bit ADCs

No Preview Available !

ADuC845/ADuC847/ADuC848
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Revision History ............................................................................... 3 
Specifications..................................................................................... 4 
Abosolute Maximum Ratings ....................................................... 10 
ESD Caution................................................................................ 10 
Pin Configurations and Function Descriptions ......................... 11 
General Description ....................................................................... 15 
8052 Instruction Set ................................................................... 18 
Timer Operation......................................................................... 18 
ALE............................................................................................... 18 
External Memory Access........................................................... 18 
Complete SFR Map .................................................................... 19 
Functional Description .................................................................. 20 
8051 Instruction Set ................................................................... 20 
Memory Organization ............................................................... 22 
Special Function Registers (SFRs)............................................ 24 
ADC Circuit Information.......................................................... 26 
Auxiliary ADC (ADuC845 Only) ............................................ 32 
Reference Inputs ......................................................................... 32 
Burnout Current Sources .......................................................... 32 
Reference Detect Circuit ........................................................... 33 
Sinc Filter Register (SF) ............................................................. 33 
Σ-Δ Modulator............................................................................ 33 
Digital Filter ................................................................................ 33 
ADC Chopping........................................................................... 34 
Calibration................................................................................... 34 
Programmable Gain Amplifier................................................. 35 
Bipolar/Unipolar Configuration .............................................. 35 
Data Output Coding .................................................................. 36 
Excitation Currents .................................................................... 36 
Data Sheet
ADC Power-On .......................................................................... 36 
Typical Performance Characteristics ........................................... 37 
Functional Description.................................................................. 39 
ADC SFR Interface..................................................................... 39 
ADCSTAT (ADC Status Register) ........................................... 40 
ADCMODE (ADC Mode Register)......................................... 41 
ADC0CON1 (Primary ADC Control Register)..................... 43 
ADC0CON2 (Primary ADC Channel Select Register) ........ 44 
SF (ADC Sinc Filter Control Register) .................................... 46 
ICON (Excitation Current Sources Control Register) .......... 47 
Nonvolatile Flash/EE Memory Overview ............................... 48 
Flash/EE Program Memory ...................................................... 49 
User Download Mode (ULOAD)............................................. 50 
Using Flash/EE Data Memory.................................................. 51 
Flash/EE Memory Timing ........................................................ 52 
DAC Circuit Information.......................................................... 53 
Pulse-Width Modulator (PWM).............................................. 55 
On-Chip PLL (PLLCON).......................................................... 60 
I2C Serial Interface ..................................................................... 61 
SPI Serial Interface ..................................................................... 63 
Using the SPI Interface .............................................................. 66 
Dual Data Pointers ..................................................................... 67 
Power Supply Monitor ............................................................... 68 
Watchdog Timer......................................................................... 69 
Time Interval Counter (TIC).................................................... 70 
8052-Compatible On-Chip Peripherals .................................. 73 
Timers/Counters ........................................................................ 75 
UART Serial Interface................................................................ 80 
Interrupt System ......................................................................... 87 
Interrupt Priority........................................................................ 88 
Interrupt Vectors ........................................................................ 88 
Rev. D | Page 2 of 110


Part Number ADuC845
Description 24-/16-Bit ADCs
Maker Analog Devices
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ADuC845 Datasheet PDF






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