IC-MN datasheet(48/62 Pages) ICHAUS

48 / 62 page

iC-MN 25-BIT NONIUS ENCODER

WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION

Rev F2, Page 48/62

DL_MT

Addr. 0x3E; bit 7:5

Code

Multiturn bit count*

0x00

...

0x0C

0x0D

0x0E

0x0F

Notes

*) Does not include synchronization bits of the

external MT sensor.

Table 84: MT data length (and counter depth)

SBL_MT

Addr. 0x41; bit 1:0

Code

MT synchronization bit

length

Synchronization range

(ST resolution)

1 bit

90°

2 bit

90°

3 bit

135°

4 bit

157.5°

Table 85: MT synchronization bit length

LNT_MT

Addr. 0x41; bit 2

Code

Function (single sync. bit, SBL_MT = 0x00)

Trailing

Leading

Table 86: Leading/trailing gear box assembly

Via CHK_MT the device can be configured so that the

counted multiturn period is verified every 8 ms. An error

in the multiturn check (the comparison of the counted

multiturn period and the external multiturn position data)

is signaled via the error bit (MT_CTR is set in the status

CHK_MT

Addr. 0x40; bit 6

Code

Function

Verification disabled

Cyclic verification each 8 ms

Table 87: Period counter verification

GRAY_MT

Addr. 0x41; bit 3

Code

Data format

Binary coded

Gray coded

Table 88: MT Interface data format

Error Handling

If a communication error appears when reading in ex-

ternal multiturn data during the startup phase (such as

pin MTSLI reading a permanent logic 0 or the external

MT sensor not responding), the first conversion and re-

quest for the external multiturn data are repeated (with

a break of 128 µs) up to three times (see Figure 21). If

the error persists after a fourth attempted readin, the

device goes into normal operating mode. Conversion

requests for the singleturn position data are possible,

but MT_ERR remains permanently set.

The error handling in normal operating mode when

the multiturn data verification is activated is shown in

Figure 22. If there is an error in communication no

further readouts are attempted and MT_ERR remains

permanently set.

read external

multiturn

mt-error-counter ++

set MT_ERR

proceed with

startup-sequence

no further multiturn-readouts

started

sync to flashcounter

proceed with

startup-sequence

yes

serial-communication error?

mt_error-counter < 4

startup

sequence with

16 ms timeout

Figure 21: Error handling during start up phase

start timer

read external

multiturn

serial

communication

error?

set MT_ERR

sync to flashcounter

and compare to counted

multiturn-value

compare-error?

set MT_CTR

normal operation:

ready for

sensordata-requests

yes

timer == 8 ms?

CHK_MT?

yes

Figure 22: Error handling during normal operation

with cyclic period counter verification

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