Microcontrollers for industrial, instrumentation, communications and automotive applications
30 June 2004
DSP, Micros & Memory
Infrastructure
Analog Devices offers two families of precision analog Flash microcontrollers that address the growing need for integration, design ease, programmability, and precision analog performance demanded by industrial, instrumentation, communications, and automotive applications. On a single chip, these devices combine precision analog functions, such as high resolution ADCs and DACs, a voltage reference, and temperature sensor with an industry-standard microcontroller and embedded Flash memory.
The ADuC7000 ARM7 family integrates precision analog measurement and control functions with a powerful 32-bit RISC microprocessor. These devices use a single 32-bit bus for instructions and data, integrate a JTAG test port for debug access, and operate at 45 MHz maximum. In addition to the 32-bit ARM instruction set, the core supports an instruction set that is compressed into 16 bits (Thumb mode). The on-chip precision analog I/O includes multichannel fast (1 MSa/s) 12-bit A/D converters; up to four 12-bit voltage-output D/A converters; a low drift (10 ppm/°C) band gap voltage reference; a temperature sensor; and a user-configurable voltage comparator. This all comes packaged in a 6 X 6 mm chip scale package.
The MicroConverter ICs were the first to integrate an industry-standard MCU core, the 8052, with Flash memory, precision analog I/O, and dual 24-bit sigma-delta A/D front ends. Like the ADuC7000 family, these devices are designed for high performance measurement and control, and data acquisition.
ARM7 architecture
The ARM TDMI option provides four additional features: a secondary 16-bit 'Thumb (T)' instruction set, debug (D) support, support for long multiplies (M), and includes the embedded ICE (I) module containing the breakpoint and watchpoint registers, which allow code to be halted for debugging purposes.
Each ADuC7000 device operates from a (2% accurate) on-chip oscillator and PLL generating an internal 45 MHz clock that is routed through a programmable clock divider from which the MCU operating frequency is generated. Power consumption is 1 mA/MHz.
62 Kbytes of nonvolatile Flash/EE and 8 Kbytes of SRAM are provided on-chip with both blocks mapped into a single linear array. ARM code can run directly from SRAM at 45 MHz, given that the SRAM is configured as a 32-bit wide memory array. The 80-pin devices support external memory.
On-chip firmware supports in-circuit serial download via the UART and JTAG serial interface ports while nonintrusive emulation is also supported via the JTAG interface.
MicroConverter products
MicroConverter ICs integrate true 12-bit to 24-bit analog precision, in-circuit reprogrammable Flash/EE memory, and an on-chip 8052 core. MicroConverters with high resolution sigma-delta A/Ds, such as the ADuC845/ADuC847/ADuC848, are particularly suited for applications that call for precise measurement of low frequency signals with a wide dynamic range. Examples include intelligent-sensor calibration and conditioning, smart transmitters, weigh scales, temperature and pressure transducers, 4 to 20 mA control loops, patient monitoring equipment, and portable test-and-measurement gear.
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