IC-MN Datasheet, PDF(49/59 Page) IC-Haus GmbH – 25-BIT NONIUS ENCODER WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION

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IC-MN Datasheet, PDF (49/59 Pages) IC-Haus GmbH – 25-BIT NONIUS ENCODER WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION

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iC-MN 25-BIT NONIUS ENCODER

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

MT INTERFACE with EXTENDED FUNCTIONS

Rev D1, Page 49/59

The serial multiturn interface can be operated in the

BiSS C protocol which enables multiturn sensor error

messages to be evaluated (via the error and warning

bits, each of which are low active) and communica-

tion to be monitored (evaluation of the CRC bits, see

Figure 25).

The error behavior of the multiturn interface has al-

ready been described in Figures 20 and 21; only a set

error bit (low) or a CRC error are now also classiï¬ed

as a communication error.

MODE_MT

Code

Notes

Addr. 0x40; bit 4:3

Function

Internal multiturn period counting

BiSS C protocol

If MODE_MT is altered during operation, command

SOFT_RES must be issued (see page 42).

Table 90: MT Interface operation mode

SWC_MT

Code

Addr. 0x41; bit 6

CRC polynomial (HEX)

0x43

0x25

Table 91: MT Interface CRC polynomial

NCRC_MT

Code

Note

Addr. 0x41; bit 4

Function

CRC veriï¬cation active

Disabled

*) Only permitted with MODE_MT = 01.

Table 92: MT Interface CRC veriï¬cation

MTMA

MTSLI

ACK START

MSB

LSB NERR NWRN MSB

LSB

DL_MT + SBL_MT

MT_ERR +

MT_WRN

CRC (NCRC_MT = 0)

tout

Figure 25: Example of the MT interface line signals with BiSS C protocol

Direct Communication To Multiturn Sensor

Making use of the BiSS Interface bus capabilities, iC-

MN can connect the external multiturn sensor to the

BiSS master controller when GET_MT is enabled. To

this end pin MA receiving the BiSS masterâs clock sig-

nal is fed through to pin MTMA and the MTSLI pin is

activated in place of the SLI pin. Upon enabling this

mode the singlecycle timeout must have elapsed and

an additional init command carried out by the BiSS

master, before it can run the ï¬rst register communi-

cation.

Example: external multiturn sensor built with iC-MN is

connected to the MT interface of a ï¬rst iC-MN, prepar-

ing the singleturn data. With GET_MT enabled, the

external multiturn can then be addressed via BiSS ID

0 and the singleturn via BiSS ID 1. This temporal

chain operation eases device parameterization during

encoder manufacturing.

GET_MT

Code

Addr. 0x41; bit 5

Function

Disabled

MT sensor communication enabled

Table 93: Direct BiSS communication enable for MT

sensor via I/O Interface

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