ADUC834BSZ Analog Devices 8bit MCU

ADUC834BSZ Overview

The ADuC834 is a complete smart transducer front end,integrating two high resolution - ADCs, an 8-bit MCU, andprogram/data Flash/EE memory on a single chip.

The two independent ADCs (primary and auxiliary) include atemperature sensor and a PGA (allowing direct measurement oflow level signals). The ADCs with on-chip digital filtering andprogrammable output data rates are intended for the measurementof wide dynamic range, low frequency signals, such as those inweigh scale, strain-gage, pressure transducer, or temperaturemeasurement applications.

The device operates from a 32 kHz crystal with an on-chip PLLgenerating a high frequency clock of 12.58 MHz. This clock isrouted through a programmable clock divider from which the MCUcore clock operating frequency is generated. The microcontrollercore is an 8052 and therefore 8051 instruction set compatiblewith 12 core clock periods per machine cycle.

62 Kbytes of nonvolatile Flash/EE program memory, 4 Kbytes ofnonvolatile Flash/EE data memory, and 2304 bytes of data RAMare provided on-chip. The program memory can be configuredas data memory to give up to 60 Kbytes of NV data memory indata logging applications.

On-chip factory firmware supports in-circuit serial download anddebug modes (via UART), as well as single-pin emulation modevia the EA pin. The ADuC834 is supported by a QuickStart™development system featuring low cost software and hardwaredevelopment tools.

Applications

Intelligent sensors
Weigh scales
Portable instrumentation, battery-powered systems
4–20 mA transmitters
Data logging
Precision system monitoring

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
See data sheet for additional features