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JRC NJU39612, Руководство пользователя

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NJU39612

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 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

Содержание NJU39612

Страница 1: ...ivers Package EMP20 BLOCK DIAGRAM NJU39612E2 NJU39612 is a dual 7 bit sign Digital to Analog Converter DAC developed to be used in micro stepping applications together with the dual stepper motor driv...

Страница 2: ...o set data bit 5 in data word 9 D4 Data 4 TTL CMOS level input to set data bit 4 in data word 10 D3 Data 3 TTL CMOS level input to set data bit 3 in data word 11 D2 Data 2 TTL CMOS level input to set...

Страница 3: ...g time requires zero to full scale or full scale to zero output change Settling time is the time required from a code transition until the DAC output reaches within 1 2 LSB of the final output value F...

Страница 4: ...drop from pin to resistor Any VRef between 0 0 V and VDD can be applied but output might be non linear above 3 0 V Power on Reset This function automatically resets all internal flip flops at power o...

Страница 5: ...5 3 8 V Rise and fall time of WR tr tf 1 s ABSOLUTE MAXIMUM RATINGS Parameter Pin no Symbol Min Max Unit Voltage Supply 4 VDD 6 V Logic inputs 5 14 16 VI 0 3 VDD 0 3 V Reference input 1 VRef 0 3 VDD...

Страница 6: ...ycle length tWR 50 ns Reset cycle length tres 80 ns Reference Input Input resistance Rref 6 9 kohm Logic Outputs Logic HIGH output current IOH VO 2 4 V 13 5 mA Logic LOW output current IOL VO 0 4 V 2...

Страница 7: ...NJU39612 Figure 8 Timing Figure 9 Timing of Reset t t t t t t t CS A0 D0 D7 WR DA Sign cs ch as ah ds dh WR t DAC tpwr t t Reset Sign res pres...

Страница 8: ...it is heavily loaded with other tasks With a microprocessor data is stored in ROM RAM area or each step is successively calculated NJU39612 is connected like any peripheral addressable device All part...

Страница 9: ...Time Time when motor is in an intermediate position Time when micro position is almost correct Write signal Motor position Note that position is always a compromise Writing to channel 1 Writing to cha...

Страница 10: ...ulses 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 ri...

Страница 11: ...n DA 1 1 NJU39612 Voltage Reference Control Logic Step Direction Clock Up Dn CE A0 WR CS Vref D0 D7 Counter PROM NJU39612 NJM3777 Figure 13 Typical application in a microprocessor based system Figure...

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