ADMCF327

The ADMCF327 is a low cost, single-chip DSP-based controller,suitable for permanent magnet synchronous motors, ac induction motors, and brushless dc motors. The ADMCF327 integrates a 20 MIPS, fixed-point DSP core with a complete set of motor control and system peripherals that permits fast, efficient development of motor controllers.

The DSP core of the ADMCF327 is the ADSP-2171, which is completely code-compatible with the ADSP-21xx DSP family
and combines three computational units, data address generators and a program sequencer. The computational units comprise an ALU, a multiplier/accumulator (MAC) and a barrel shifter.The ADSP-2171 adds new instructions for bit manipulation,multiplication (× squared), biased rounding and global interrupt masking.

The system peripherals are the power-on reset circuit (POR),the watchdog timer and a synchronous serial port. The serial port is configurable, and double buffered, with hardware support for UART and SCI port emulation.

The ADMCF327 provides 512 × 24-bit program memory RAM,4K × 24-bit program memory ROM, 4K × 24-bit program FLASH memory, and 512 × 16-bit data memory RAM. The user code will be stored and executed from the flash memory.The program and data memory RAM can be used for dynamic data storage or can be loaded through the serial port from an external device as in other ADMCxxx family parts. The program memory ROM contains a monitor function as well as useful routines for erasing, programming, and verifying the flash memory.

The motor control peripherals of the ADMCF327 provide a 12-bit analog data acquisition system with six analog input channels,and an internal voltage reference. In addition, a three-phase,16-bit, center-based PWM generation unit can be used to produce high accuracy PWM signals with minimal processor overhead.The ADMCF327 also contains two auxiliary PWM outputs and nine lines of digital I/O.

Because the ADMCF327 has a limited number of pins, functions such as the auxiliary PWM and the serial communication port are multiplexed with the nine programmable input/output (PIO)pins. The pin functions can be independently selected to allow maximum flexibility for different applications.