IC-LNG_14 Datasheet, PDF (19/30 Pages) IC-Haus GmbH – 16-BIT OPTO ENCODER

iC-LNG 16-BIT OPTO ENCODER ^preliminary
WITH SPI AND SERIAL / PARALLEL OUTPUTS
PACTIVE
Code
0
1
Description
Sensor data channel deactivated
Sensor data channel activated
Table 12: Sensor data via SPI
CS
SCLK
MOSI
MISO
REQ
OP
OP
Rev B1, Page 19/30
SD1 SD2
...
If PACTIVE is not set, on commands Sensor data sta-
tus or Sensor data transmission the ERROR bit is
set in the STATUS byte (Table 14), indicating that the
command has not been carried out. The slave imme-
diately outputs the data at MISO which has been sent
by the master through MOSI.
If only one slave is connected up with one register and
one sensor data channel, it must be ensured that the
RACTIVE and PACTIVE bits are last in the data byte
(Figure 6).
NB:
If the slaves are connected in a chain (full duplex
chain), with this command the master can determine
the number of connected register and sensor data
channels. To this end it can send a 1 after the opcode,
which is repeated at MISO after the number of register
and sensor data channels (Figure 6).
8 cycles
Figure 7: SDAD transmission: read SD
With command Sensor data transmission the master
can not only read sensor data (SD) out from the slave;
at the same time it can also transmit actuator data (AD)
to the slave. iC-LNG ignores the transmitted actuator
data.
REQ
CS
SCLK
MOSI
OP
AD1 AD2
...
MISO
OP
SD1 SD2
...
8 cycles
Figure 8: SDAD transmission: read SD, write AD
CS
SCLK
MOSI
MISO
OP
1 0 0 0 0 0 RA PA
OP
00100000
8 cycles
RACTIVE / PACTIVE vector
Figure 6: Setting ACTIVATE: RACTIVE/PACTIVE
(one slave)
Sensor data status
Should the master not know the processing time, it can
request sensor data using the command Sensor data
status. iC-LNG does not need any processing time;
therefore, SVALID is always valid.
The command causes
Sensor data transmission
iC-LNG samples its position data on the first rising
edge at SCLK if CS is switched to 1 (REQ). The sensor
data shift register is looped-in between signals MOSI
and MISO for SPI communication and can then be
clocked out. The size of the sensor data shift regis-
ter must be set to 16 bits (cf. section on shift register
output, page 25).
1. all slaves activated with PACTIVE to switch their
SVALID register between MOSI and MISO.
2. The next request for sensor data, triggered on
the first rising edge at SCLK when CS has again
been set to 1, is ignored by the slave.
If invalid data is sampled in the shift register, the ER-
ROR bit is set in the STATUS byte (Table 14) and ze-
roes are output as the data word.
The end of conversion is signaled by SVALID (SV).
With this command the master can poll to the end of
conversion. The sensor data is readout on the com-
mand Sensor data transmission.