NJU39612 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU39612

MICROSTEPPING MOTOR CONTROLLER WITH DUAL DAC

Japan Radio Corporation  

NJU39612

s Programming NJU39612

There are basically two different ways of programming the NJU39612. They are called “single-pulse programming”

and “double-pulse programming.” Writing to the device can only be accomplished by addressing one register at a

time. When taking one step, at least two registers are normally updated. Accordingly there must be a certain time

delay between writing to the first and the second register. This programming necessity gives some special stepping

advantages.

Double-pulse Programming

The normal way is to send two write pulses to the device, with the correct addressing in between, keeping the delay

between the pulses as short as possible. Write signals will look as illustrated in figure10. The advantages are:

• low torque ripple

• correct step angles between each set of double pulses

• short compromise position between the two step pulses

• normal microstep resolution

Single-pulse Programming

A different approach is to send one pulse at a time with an equally-spaced duty cycle. This can easily be accom-

plished and any two adjacent data will make up a microstep position. Write signals will look as in figure 11. The

advantages are:

• higher microstep resolution

• smoother motion

The disadvantages are:

• higher torque ripple

• compromise positions with almost-correct step angles

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