IC-MN_16 Datasheet, PDF (53/62 Pages) IC-Haus GmbH – 25-BIT NONIUS ENCODER WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION

iC-MN 25-BIT NONIUS ENCODER
WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION
STARTUP BEHAVIOR
Rev F2, Page 53/62
Figure 29 shows the startup behavior of iC-MN. After
turning on the power supply (power-on reset) iC-MN
reads the configuration data from the EEPROM. If the
data can be read without error, a timeout of 8 ms is
allowed to elapse.
If the multiturn interface has been configured for an
external sensor, the device waits for a longer timeout of
16 ms to elapse. The multiturn data is then read in and
the first conversion performed in order to determine the
absolute position (see page 48). iC-MN then goes into
normal operation.
Behaviour On Error During Startup
If an error occurs while the EEPROM data is being
read (a CRC error or communication error with the
EEPROM), the current readin process is canceled and
restarted. Following a third failed attempt the readin
procedure is ended and the internal iC-MN configura-
tion registers (addresses 0x00 to 0x4D) initialized with
a zero.
In doing so, NBISS = 0 selects for the BiSS C protocol
for the I/O interface enabling BiSS C register communi-
cation.
startup
read EEPROM
(max 3 times on error)
EEPROM ok?
serial-interface active
for configuration
(no sensor data request
MODE_MT = 00
possible)
yes
no
8 ms timeout
16 ms timeout
via command SOFT_RES
command execution
no
normal operation:
ready for
sensor data requests
MODE_ST:
sync_mode is
yes
nonius?
yes
first conversion to get
initial period information
MODE_MT = 00
no
multiturn-startup
Figure 29: Startup behavior
If an attempt to read sensor data is made iC-MN would
reply an 8-bit zero value with set error and warning bits
(sequence: start bit 1x high, 1x SCD bit, position 8x
zero, error/warning 2x zero, CRC 6x high followed by
zero bits when the clock signal is continued).
Note:
Following the successful initial configuration of iC-MN
using the I/O interface the command SOFT_RES must
be executed in order to switch iC-MN to normal oper-
ation (see P. 42).
If during the initial configuration process CFG_E2P
is configured to bank-wise addressing (see P. 54 ff),
please note that bank-wise addressing mode is only
enabled after command SOFT_RES.