ADI ADuC7026 多路数据采集方案

ADI公司的ADuC7019/20/21/22/24/25/26/27/28是全集成的1MSPS 12位数据采集系统,包括了高性能多路ADC,16位/32位MCU和闪存/电可改写(EE)存储器.其中的ADC由多达12个单端输入,输入电压从0V到VREF,而DAC输出则可编程.微控制器内核是ARM7TDMI,16位/32位RISC,其性能高达41MIPS.工作电压从2.7V到3.6V,广泛应用在工业控制和自动化系统,智能传感器和精密仪表以及基站系统和光纤网络系统.本文介绍了ADuC7019/20/21/22/24/25/26/27/28的主要特性和方框图以及ADuC7026评估板的电路图以及所用的元件列表.

The ADuC7019/20/21/22/24/25/26/27/28 are fully integrated,1 MSPS, 12-bit data acquisition systems incorporating high performance multichannel ADCs, 16-bit/32-bit MCUs, and
Flash/EE memory on a single chip.
The ADC consists of up to 12 single-ended inputs. An additional four inputs are available but are multiplexed with the four DAC output pins. The four DAC outputs are only available on certain models (ADuC7020 and ADuC7026). However, in many cases where the DAC outputs are not present, these pins can still be used as additional ADC inputs, giving a maximum of 16 ADC input channels. The ADC can operate in single-ended or differential
input modes. The ADC input voltage is 0 V to VREF. A low drift band gap reference, temperature sensor, and voltage comparator complete the ADC peripheral set.

Depending on the part model, up to four buffered voltage output DACs are available on-chip. The DAC output range is programmable to one of three voltage ranges.

The devices operate from an on-chip oscillator and a PLL generating an internal high frequency clock of 41.78 MHz. This clock is routed through a programmable clock divider from which the MCU core clock operating frequency is generated.

The microcontroller core is an ARM7TDMI, 16-bit/32-bit RISC machine, which offers up to 41 MIPS peak performance. Eight kilobytes of SRAM and 62 kilobytes of nonvolatile Flash/EE
memory are provided on-chip. The ARM7TDMI core views all memory and registers as a single linear array.

On-chip factory firmware supports in-circuit serial download via the UART or I2C serial interface ports, while nonintrusive emulation is also supported via the JTAG interface. These
features are incorporated into a low cost QuickStart™ Development System supporting this MicroConverter  family.

The parts operate from 2.7 V to 3.6 V and are specified over an industrial temperature range of −40°C to +125°C. When operating at 41.78 MHz, the power dissipation is typically 120 mW. The ADuC7019/20/21/22/24/25/26/27/28 are available in a variety of memory models and packages.

主要特性:
Analog I/O
Multichannel, 12-bit, 1 MSPS ADC
Up to 16 ADC channels1
Fully differential and single-ended modes
0 V to VREF analog input range
12-bit voltage output DACs
Up to 4 DAC outputs available
On-chip voltage reference
On-chip temperature sensor (±3°C)
Voltage comparator
Microcontroller
ARM7TDMI core, 16-bit/32-bit RISC architecture
JTAG port supports code download and debug
Clocking options
Trimmed on-chip oscillator (±3%)
External watch crystal
External clock source up to 44 MHz
41.78 MHz PLL with programmable divider
Memory
62 kB flash/EE memory, 8 kB SRAM
In-circuit download, JTAG-based debug
Software-triggered in-circuit reprogrammability
On-chip peripherals
UART, 2 × I2C  and SPI  serial I/O
Up to 40-pin GPIO port1
4× general-purpose timers
Wake-up and watchdog timers (WDT)
Power supply monitor
3-phase, 16-bit PWM generator
Programmable logic array (PLA)
External memory interface, up to 512 kB1
Power
Specified for 3 V operation
Active mode: 11 mA @ 5 MHz, 40 mA @ 41.78 MHz
Packages and temperature range
From 40-lead 6 mm × 6 mm LFCSP to 80-lead LQFP1
Fully specified for –40°C to +125°C operation
Tools
Low cost QuickStart™ development system
Full third-party support
主要应用:
Industrial control and automation systems
Smart sensors, precision instrumentation
Base station systems, optical networking



图1. ADuC702x方框图



图2. ADuC7026评估板电路图
ADuC7026评估板元件列表:
ADuC7026 Evaluation Board Parts List