IC-MN Datasheet, PDF(42/59 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 (42/59 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

COMMAND and STATUS REGISTERS

Rev D1, Page 42/59

Execution Of Internal Commands

The command register at address 0x77 can be ac-

cessed fully independent of the internal state of op-

eration. Depending on the data value written to this

triggered.

MN_CMD

Code

0x0

0x1

0x2

0x3

0x4

...0xF

Addr. 0x77; bit 2:0

Command

Description

SOFT_RES

Soft reset

(new startup using

internal conï¬g. data)

WRITE_CONF

Transfers internal conï¬g.

data to the EEPROM

SOFT_PRES

Calls preset routine

CRC_CHECK

CRC veriï¬cation of the

internal conï¬g. data

TOG_BISS

Temporal toggle of

interface protocol:

BiSS C â SSI

No function

Table 70: Implemented commands

The command SOFT_RES resets internal state ma-

chines, counters, and the status registers. The conï¬g-

uration RAM is not reset here. During the command

execution a write access to the conï¬guration RAM is

still possible, whereas the external EEPROM is not ac-

cessible.

If the device is in nonius mode (see page 30), the ï¬rst

conversion is used to determine the period and the re-

sult stored as an initial value for the period fraction of

the internal ï¬ash counter. If an external multiturn de-

vice is conï¬gured (MODE_MT = 00), its data is read

in and stored as the initial value for the multiturn data

fraction of the internal ï¬ash counter.

With WRITE_CONF the internal conï¬guration is stored

to the EEPROM. The CRC (CRC_E2P) is automat-

ically updated and written to address 0x4E or 0x4F.

For a description of the preset routine initiated by

SOFT_PRES see page 50.

CRC_CHECK starts a CRC veriï¬cation of the inter-

nal conï¬guration RAM. During the check the internal

data bus may not be accessed. Should the check not

conï¬rm the conï¬guration data as error free, status bit

EPR_ERR is set.

command can be used for SSI encoders to later enable

parameterization, for example.

Execution Of Protocol Commands

iC-MN supports selected BiSS C protocol commands:

CMD

Selected address

(IDS > 0x00)

Execute SOFT_PRES

Execute CRC_CHECK

Broadcast address

(IDS = 0x00)

Table 71: Implemented protocol commands

Automatic Reset Function

AUTORES can be used to set whether the command

SOFT_RES is automatically generated or not if the er-

ror AM_MIN occurs.

AUTORES

Code

Addr. 0x44; bit 1:0

Function

No automatic reset

SOFT_RES after error AM_MIN, timeout 8 ms

SOFT_RES after error AM_MIN, timeout 16 ms

SOFT_RES after error AM_MIN, timeout 32 ms

Table 72: Automatic reset function

For as long as the amplitude of the master track is too

low or the AM_MIN error is set, SOFT_RES is active.

When AM_MIN is no longer set, the timeout conï¬g-

ured using AUTORES expires. It is only after this that

SOFT_RES is reset and the device subsequently re-

turns to normal operation.

Should an AM_MIN error occur while a command or

the preset function is being carried out, SOFT_RES is

only implemented once the command has been termi-

nated.

The behavior of the I/O interface with an active

SOFT_RES depends on the protocol selected. For

BiSS C a zero is returned as a data value and the error

and warning bits are set; for SSI the last data value to

be output is repeated (the error bit is set if conï¬gured

via SSIE). In both cases the error state is indicated at

pin NERR by a low signal.

Command TOG_BISS only causes the communication

protocol to switch temporarily (BiSS â SSI, or SSI â

BiSS). RAM parameter NBISS is not altered here. The

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