IC-PI datasheet(34/49 Pages) ICHAUS

34 / 49 page

preliminary

iC-PI PROGRAMMABLE 12-BIT

Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

Rev B1, Page 34/48

tance intermediately. Afterwards, the applied angle is

continuously tracked again.

Full-Scale Interpolation (Over 2x 180°)

DUAL

Addr. 0x07, bit 7

Code

Mode

0x0

Analog input function

0x1

2-bit digital input function

Table 49: Dual Input Mode

Utilizing the digital input mode for channel CH0 (DUAL =

1, see Table 49), the signals applied to the inputs X1

and X2 are interpreted as a Gray-coded multiturn posi-

tion. iC-PI uses this information to distinguish between

the first and second half of the mechanical revolution,

when sin/cos signals with 2 cycles per turn are applied

(refer to input signal X3 in Figure 18).

Figure 18: Signal example for interpolation factor x8

(for DUAL = 1).

For X1 and X2, the following pin signals are expected:

Pin X1

Pin X2

Quadrant Information

State

Quadrant

First quadrant

Second quadrant

Third quadrant

Fourth quadrant

Table 50: Quadrant Detection (for DUAL = 1)

The count and index signals change based on the val-

ues of three registers: SELRES, CFGZPOS, and DUAL.

SELRES determines the conversion resolution and

CFGZPOS the angle at which the signal is output. If

DUAL = 0 (analog), the signals are output within one

sine period, else DUAL = 1 (digital) and the signals are

output once per every two sine periods, which corre-

spond to one revolution.

The internal absolute position can be shifted by the

incremental signals and the commutation signals. The

shift range is within 1 sine period for DUAL = 0, and 2

sine periods for DUAL = 1.

OFFSET

Addr. 0x26, bit 7:0

Code

Absolute position offset

0x00

0°

0x01

1.4°

. . .

0xFF

358.6°

Table 51: Absolute Position Offset

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