IM2000S datasheet(14/16 Pages) ETC

14 / 16 page

Figure 3.10: External Lookup Table

IM2000S

AD0-AD7

To Sine

D/A Converter

To Cosine

D/A Converter

Decimal

Lookup

Table

Sine

Decimal

Lookup

Table

Cosine

In reconstructing the sine and cosine

waveforms, the IM2000S addresses

locations 0 - 249 to reconstruct the first

quarter of the waveform. The 250th

location represents the peak or start of

the second quarter. Table 3.4 shows the

addresses generated by the IM2000S for a

resolution of 5 microstep per step

selected by MSEL0 - MSEL3.

Figure 3.10 shows a block diagram

utilizing external lookup tables.

Buss/Stand-alone Mode

The IM2000S may be used either in stand-alone mode or tied

directly to the data buss of a microprocessor/controller.

If the Mode input is HIGH, the IM2000S will be in stand-

alone mode and MSEL0 - MSEL3 and DIR will be updated on

the rising edge of the SCLK input. The EN input is not

dependent on the SCLK input.

If the Mode input is LOW, the IM2000S will be in Buss Mode

and MSEL0 - MSEL3, DIR and EN are latched into the

IM2000S on the rising edge of the WR input. Figure 3.11

shows the timing diagram for the WR input.

Figure 3.11: WR Input Timing

MODE

MSEL0 - MSEL3

DIR, EN

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