ADUC831BSZ

The ADuC831 is a fully integrated 247 kSPS data acquisition system incorporating a high performance self-calibrating multichannel 12-bit ADC, dual 12-bit DACs, and programmable 8-bit MCU on a single chip. The microcontroller core is an 8052, and therefore 8051- instruction-set compatible with 12 core clock periods per machine cycle. 62 kBytes of nonvolatile Flash/EE program memory are provided on-chip. Four kBytes of nonvolatile Flash/EE data memory, 256 bytes RAM and 2 kBytes of extended RAM are also integrated on-chip. The ADuC831 also incorporates additional analog functionality with two 12-bit DACs, power supply monitor, and a band gap reference. On-chip digital peripherals include two 16-bit Σ-∆ DACs, dual output 16-bit PWM, watchdog timer, time interval counter, three timers/counters, Timer 3 for baud rate generation and serial I/O ports I²C, SPI and UART. 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. The ADuC831 is supported by QuickStart and QuickStart Plus development systems featuring low cost software and hardware development tools.

Applications

• Optical Networking—Laser Power Control
• Base Station Systems
• Precision Instrumentation, Smart Sensors
• Transient Capture Systems
• DAS and Communications Systems
• Pin compatible upgrade to existing ADuC812 systems that require additional code or data memory. Runs from 1 MHz–16 MHz to external crystal.

Key features

• ANALOG I/O 8-Channel, 247 kSPS 12-Bit ADC
• DC Performance: 1 LSB INL
• AC Performance: 71 dB SNR
• DMA Controller for High Speed ADC-to-RAM Capture
• 2 12-Bit (Monotonic) Voltage Output DACs
• Dual Output PWM/ - DACs
• On-Chip Temperature Sensor Function ±3℃
• On-Chip Voltage Reference
• Memory 62 kBytes On-Chip Flash/EE Program Memory
• 4 kBytes On-Chip Flash/EE Data Memory
• Flash/EE, 100 Yr Retention, 100 kCycles Endurance
• 2304 Bytes On-Chip Data RAM
• 8051 Based Core 8051 Compatible Instruction Set (16 MHz Max)
• 12 Interrupt Sources, 2 Priority Levels
• Dual Data Pointer
• Extended 11-Bit Stack Pointer
• On-Chip Peripherals Time Interval Counter (TIC)
• UART, I²C, and SPI Serial I/O
• Watchdog Timer (WDT), Power Supply Monitor (PSM)
• Power Specified for 3V and 5 V Operation
• Normal, Idle, and Power-Down Modes
• Power-Down: 20 μA @ 3 V