IC-MU_13 Datasheet, PDF (26/59 Pages) IC-Haus GmbH – OFF-AXIS NONIUS ENCODER WITH INTEGRATED HALL SENSORS

iC-MU OFF-AXIS NONIUS ENCODER
WITH INTEGRATED HALL SENSORS
preliminary
Serial interface
Configuring the data format and data length
Rev B1, Page 26/59
MODE_ST selects data
of Output Shift Register
MODE_ST=0x0
MSB
Internal Absolute Data
MT
37 37..29
MODE_ST=0x1
Internal FlexCount ® Data
37
MODE_ST=0x2
Internal Raw Data
37
BitOsUeleTc_tMedSbBy
LSB MSB
MT MPC
26..18 25..17
LSB MSB
MPC MAS
14 13
BitOsUeleTc_tLeSdBby
MSB
ABZ
17
MSB
NON
27
LSB MSB
NON MAS
16 15 14 13
LSB
MAS
0
LSB
ABZ
0
LSB
MAS
0
OUT_LSB
OUT_MSB
OUT_ZERO
MODEA
Output Shift Register
PA3 ^MSB
LSB 0
shift direction
0 ERR WRN _PA2
Figure 12: Determining the output data length
The structure of the output shift register is shown in
Figure 12. The abbreviation MT stands for the multi-
turn data, MPC is short for the number of master peri-
ods in bit, ABZ for the data whose resolution is speci-
fied by the parameter RESABZ (Table 67), NON for the
data of the nonius track and MAS for the data of the
master track. The numbering of the user data starts
at the LSB with zero. OUT_MSB and OUT_LSB deter-
mine which part of the user data is output by the output
shift register.
Data length = 13 + OUT_MSB - OUT_LSB + OUT_ZERO +
optional ERR/WRN (depending on MODEA)
There is an exception for the calculation of the output
data length. If parameter MPC=12 and OUT_LSB = 0,
the number of output bits is given by:
data_length_2 = OUT_MSB + OUT_ZERO + ERR/WRN (de-
pending on MODEA) - 2
MODE_ST selects the type of user data to be output
through the output shift register.
MODE_ST(1:0) Addr. 0x12; bit 5:4
Code
Description
0x0
output absolute position
0x1
output position in user resolution*) (Flexcount®)
0x2
output raw-data of Master- and Noniustrack
0x3
reserved
Note:
*) resolution defined by RESABZ (Table 67)
Table 30: Selection of output data
MODEA(2:0)
Addr. 0x0B; bit 2:0
Function Error
Warning
low active high active low active
SPI
-
-
-
BiSS
x
-
x
SSI
-
-
-
SSI+ERRL x
-
-
SSI+ERRH -
x
-
ExtSSI
x
-
x
high active
-
-
-
-
-
-
Table 31: MODEA: error/warning-bit within serial pro-
tocols
The number of output bits is determined by parame-
ters OUT_MSB, OUT_LSB, OUT_ZERO and the er-
ror/warning bits (see Figure 12 and Table 31):
OUT_MSB configures the bit of the user data which is
output as MSB at pin PA3.