IC-MU_13 Datasheet, PDF (33/59 Pages) IC-Haus GmbH – OFF-AXIS NONIUS ENCODER WITH INTEGRATED HALL SENSORS

iC-MU OFF-AXIS NONIUS ENCODER
WITH INTEGRATED HALL SENSORS
preliminary
Rev B1, Page 33/59
1. All slaves activated via PACTIVE to switch their
SVALID register between MOSI and MISO.
2. The next request for sensor data started with the
first rising edge at SCLK of the next SPI commu-
nication is ignored by the slave.
N.B.: iC-MU does not need additional
processing time to generate valid sensor
data. Therefore "SDAD-transmission" can
be issued directly.
SDAD status
1
no
The end of conversion is signaled by SVALID (SV). Us-
ing this command, the master can poll to the end of
conversion. The sensor data is read out via the com-
mand SDAD transmission.
SVALID
Code
0
1
Description
Sensor data invalid
Sensor data valid
Table 45: SVALID
NCS
SCLK
MOSI
MISO
REQ
OP
OP SV 0-7 SV 8-15 ...
SV == 1?
yes
SDAD-transmission 2
REGISTER
status/data
(ERROR == 1)?
yes
error
handling
Figure 23: Example sequence of the commands
SDAD Status/SDAD-transmission
8 cycles
Figure 21: SDAD status
If only one slave is connected, the corresponding
SVALID bit (SV0) is placed at bit position 7 in the
SVALID byte.
NCS
SCLK
MOSI
MISO
REQ
OP
00000000
OP SV 0 0 0 0 0 0 0 0
MOSI
MISO
OP 0 0 0 0 0 0 0 0
OP SV 0 SV 1 0 0 0 0 0 0
8 cycles
SVALID-vector
Figure 22: SDAD status (Example with one and
two slaves)
SPI interface: Command Read REGISTER (single)
This command enables register data to be read out
from the slave byte by byte.
The master first transmits the Read REGISTER (sin-
gle) command and then address ADR. The slave im-
mediately outputs the command and address at MISO.
1
NCS
SCLK
MOSI
OP ADR
+
MISO
OP
ADR
8 cycles
2
OP
OP STATUS DATA
Figure 24: Read REGISTER (single): set the read
address (1) + command REGISTER
status/data to read-out data (2)
Picture 23 shows the interaction of the two commands
SDAD Status and SDAD transmission. It is not nec-
essary to start each sensor data communication with
the command SDAD Status (1). iC-MU has no pro-
cessing time and can therefore directly output valid
sensor data. Because of that the command sequence
can start with SDAD-transmission (2). Following this,
the command REGISTER status/data should be exe-
cuted to detect an unsuccessful SPI communication.
Following this, using the REGISTER status/data com-
mand (see page 34) the master can poll until the valid-
ity of the DATA following the SPI-STATUS byte is sig-
naled via SPI-STATUS.
SPI interface: Command Write REGISTER (single)
This command enables data to be written to the slave
byte by byte.