IC-MPEVALMP1D datasheet(14/22 Pages) ICHAUS

14 / 22 page

iC-MP 8-BIT HALL ANGLE ENCODER

WITH RATIOMETRIC OUTPUT

Rev B1, Page 14/22

D(51:0)

Parameter

Description

7:0

OFFSET1(7:0)

Offset of the ﬁrst set

11:8

MODE1(3:0)

Mode of the ﬁrst set,

see Table 5 and 6

13:12

ENERR1(1:0)

Error mask of the ﬁrst

set, see Table 8

21:14

OFFSET2(7:0)

Offset of the second set

25:22

MODE2(3:0)

Mode of the second set,

see Table 5 and 6

27:26

ENERR2(1:0)

Error mask of the

second set, see Table 8

35:28

OFFSET3(7:0)

Offset of the third set

39:36

MODE3(3:0)

Mode of the third set,

see Table 5 and 6

41:40

ENERR3(1:0)

Error mask of the third

set, see table 8

45:42

CRCID(3:0)

CRC ID

47:46

ZTEST(1:0)

Zener zap diodes, for

iC-Haus test purposes

only

51:48

TEST(3:0)

See ’TEST MODES’

Table 4: Programming Datastream

MODE1(1:0)

D(9:8)

MODE2(1:0)

D(23:22)

MODE3(1:0)

D(37:36)

Code

Full Scale Angle

360°

270°

180°

90°

Table 5: Linear Analog Output - Mode Bit 1:0

MODE1(2)

D(10)

MODE2(2)

D(24)

MODE3(2)

D(38)

Code

Rotation

CW*

CCW*

*) CW = clockwise, CCW = counter-clockwise

Table 6: Mode Bit 2

MODE1(3)

D(11)

MODE2(3)

D(25)

MODE3(3)

D(39)

Code

Range

(0 % - 100 %) * VDD

(10 % - 90 %) * VDD

Table 7: Linear Analog Output - Mode Bit 3

ENERR

The parameter ENERR indicates two kind of errors. If

the magnetic ﬁeld strength is at low a ’Loss of Mag-

net’ is generated. An ’Excessive Frequency Alarm’ is

generated when the revolution per minute is to high.

Parameter ENERR handles the various error types.

ENERR1(1:0)

D(13:12)

ENERR2(1:0)

D(27:26)

ENERR3(1:0)

D(41:40)

Code

Error

No Error

Loss of Magnet*

Excessive Frequency Alarm

Excessive Frequency Alarm or Loss of Magnet*

*) see ’DESIGN REVIEW’

Table 8: Error masks

Calculating the position offset

Before iC-MP outputs the actual position via the serial

interface or the linear analog output (LAO), an offset is

added internally. This offset consists of the following

parameters:

OFFSET = OFFSET1 xor OFFSET2 xor OFFSET3

The offset is programmed in several stages (see Fig-

ure 16). It is important that the direction of rotation is

programmed prior to this (MODE Bit 2). To determine

the actual conﬁgured offset, all three offset parameters

must be read out. After these parameters have been

xored the actual offset is determined:

Actual Offset = OFFSET1 xor OFFSET2 xor OFFSET3

To calculate the new offset the actual position at the

required offset is required. The formula used to calcu-

late this new offset is as follows:

New Offset = 256 - Actual Position + Actual Offset

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