MicroConverter® Multichannel
24-/16-Bit ADCs with Embedded 62 kB
Flash and Single-Cycle MCU
ADuC845/ADuC847/ADuC848
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)
Rev. D
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
FUNCTIONAL BLOCK DIAGRAM
AVDD
ADuC845
AVCO
CURRENT
SOURCE
IEXC1
IEXC2
AIN1
BUF
PGA
PRIMARY
24-BIT - ADC
12-BIT
DAC
BUF
DAC
MUX
AGND
AIN10
AINCOM
AUXILIARY
24-BIT - ADC
TEMP
SENSOR
REFIN2+
DUAL 16-BIT
- DAC
PWM0
MUX
DUAL 16-BIT
PWM
PWM1
REFIN2–
REFIN–
REFIN+
EXTERNAL
VREF
DETECT
INTERNAL
BAND GAP
VREF
SINGLE-CYCLE 8061-BASED MCU
RESET
DVDD
62 kBYTES FLASH/EE PROGRAM MEMORY
4 kBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
POR
DGND
PLL AND PRG
CLOCK DIV
OSC
XTAL1
WAKE-UP/
RTC TIMER
3 16 BIT TIMERS
BAUD RATE TIMER
4 PARALLEL
PORTS
POWER SUPPLY MON
WATCHDOG TIMER
UART, SPI, AND I 2C
SERIAL I/O
04741-001
Data Sheet
XTAL2
Figure 1. ADuC845 Functional Block Diagram
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