GENERAL DESCRIPTION

INTRODUCTION

The ST72141K2-Auto devices are members of the ST7 microcontroller family designed specifically for motor control applications and including A/D conversion and SPI interface capabilities. They include an on-chip Motor Controller peripheral for control of electric brushless motors with or without sensors. An example application, for 6-step control of a Permanent Magnet DC motor, is shown in Figure 1.

■ Memories

– 8 Kbytes Program memory (OTP/EPROM)

– 256 bytes RAM

■ Clock, Reset and Supply Management

– Enhanced reset system

– Low voltage supply supervisor

– 3 power saving modes

■ 14 I/O Ports

– 14 multifunctional bidirectional I/O lines with: External interrupt capability (2 vectors), 13 alternate function lines, 3 high sink outputs

■ Motor Control peripheral

– 6 PWM output channels

– Emergency pin to force outputs to HiZ state

– 3 analog inputs for rotor position detection with no need for additional sensors

– Comparator for current limitation

■ 3 Timers

– Two 16-bit timers with: 2 input captures, 2 output compares, external clock input, PWM and Pulse generator modes

– Watchdog timer for system integrity

■ Communications Interface

– SPI synchronous serial interface

■ Analog Peripheral

– 8-bit ADC with 8 input pins

■ Instruction Set

– 8-bit data manipulation

– 63 basic instructions

– 17 main addressing modes

– 8 x 8 unsigned multiply instruction

– True bit manipulation

■ Development Tools

– Full hardware/software development package