DESCRIPTION

· The ADuC841/ADuC842/ADuC843 are smart transducer front ends integrating a high-performance self-calibrating multichannel ADC, dual DAC, and a 20 MHz 8-bit MCU (8051 instruction set compatible) on a single chip.

· ADuC841 and ADuC842 differ in clock oscillator circuits; ADuC841 uses an external crystal up to 20 MHz, while ADuC842 uses a 32 kHz crystal with an on-chip PLL.

· ADuC843 is similar to ADuC842 but lacks analog DAC outputs.

· The microcontroller is an optimized 8052 core offering up to 20 MIPS peak performance.

· Memory options include up to 62 kBytes of nonvolatile Flash/EE program memory, 4 kBytes of nonvolatile Flash/EE data memory, 256 bytes RAM, and 2 kBytes of extended RAM.

FEATURES

· Pin-compatible upgrade of ADuC812/ADuC831/ADuC832 with increased performance.

· Single-cycle 20 MIPS 8052 core and 420 kSPS 12-bit ADC.

· Up to 62 kBytes on-chip Flash/EE program memory and 4 kBytes on-chip Flash/EE data memory.

· In-circuit reprogrammable Flash/EE with 100-year retention and 100 kCycle endurance.

· 2304 bytes on-chip data RAM and 8 mm × 8 mm chip scale package.

· 8-channel, 420 kSPS high accuracy 12-bit ADC with on-chip 15 ppm/°C voltage reference.

· DMA controller, high-speed ADC-to-RAM capture, and two 12-bit voltage output DACs.

· Dual output PWM Σ-∆ DACs and on-chip temperature monitor function.

· 8052 based core with 8051 compatible instruction set (20 MHz max).

· High-performance single-cycle core with 32 kHz external crystal and on-chip programmable PLL.

· 12 interrupt sources, 2 priority levels, dual data pointers, and extended 11-bit stack pointer.

· On-chip peripherals include time interval counter, UART, I2C, SPI serial I/O, watchdog timer, and power supply monitor.

· Power supply: 4.5 mA @ 3 V (core CLK = 2.098 MHz) in normal mode, 10 µA @ 3 V in power-down mode.

· Low-cost comprehensive development system with nonintrusive single-pin emulation and IDE-based assembly and C source debugging.

APPLICATIONS

· Optical networking — laser power control.

· Base station systems.

· Precision instrumentation and smart sensors.

· Transient capture systems.

· DAS and communications systems.