The RMV856 is a high-performance stepper motor controller IC that provides all the tools for performing sophisticated motion control, in a quick and easy way. An asynchronous serial port provides the control link between the microcontroller or host computer and the IC. 

  A refined algorithm provides stepping rates from 16 to 8500 steps/sec. with linear acceleration-deceleration and all the necessary functions for executing smooth and complex motion profiles. External control lines make the stepper controller to react according to external events such as limit switches, home sensors and shaft position encoders. Three stepping modes are available in order to driving the phase outputs. The device can also operate in external driver mode, providing signals for interfacing with standard high-power drivers. A power save control feature allows stand by power to be reduced while the motor is idle for a given period of time.

A remarkable feature, the velocity profiling mode, gives the user the freedom to program any kind of ramping or speed shaping using the internal 128 bytes FIFO.

The RMV856 has been conceived as peripheral IC which can be connected as any one of the possible 16 controllers of a multi-motor system, which allows them to operate using a RS232 or RS485 link. 

Thirteen general-purpose bi-directional digital lines provide data handshaking and control of external devices. An SPI (Serial Peripheral Interface) port is also available for controlling 3 or 2 wire devices such as Analog to Digital Converters (ADC's) or Digital to Analog Converters (DAC's). This interface can operate either as 8 or 16 bit width mode, and the clock speed is also selectable between 115.2 Kbits/sec and 1.8432 Mbits/sec.

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