IC-HF Datasheet, PDF (12/36 Pages) IC-Haus GmbH – 6-CH. ENCODER LINK, RS-422 DRIVER/RECEIVER

iC-HF
preliminary
6-CH. ENCODER LINK, RS-422 DRIVER/RECEIVER
Rev C1, Page 12/36
municating with a sensor using BiSS protocol and
RS-422 physical layer, suitable for industrial environ-
ments. The sensor’s BiSS lines should be connected
to pins X4, X5 and X6 of iC-HF. The BiSS/SSI master
must use pin pairs Q4/NQ4, Q5/NQ5 and Q6/NQ6 for
BiSS communication.
Channel 4 is configured as an RS-422 output driver
and carries SLO signal. SLO from the sensor in single
ended form must be connected to input pin X4. The
signal SLO will be delivered by pins Q4/NQ4 to the
master following the RS-422 standard.
1 μF
SLO
VDDS
GNDS
X1
NX1
X2
NX2
X3
NX3
X4
VDD
3..5.5V
REVERSE POLARITY PROTECTION GND
1 μF
Encoder Link
Encoder Link
Encoder Link
RS422 output
TRI
Q1
NQ1
Q2
NQ2
Q3
NQ3
Q4
NQ4
SLO
MA
X5
RS422 Input Q5
+
_
TRI
NQ5
MA
SLI
X6
RS422 Input Q6
+
_
TRI
NQ6
SLI
PTC
ECM
OEN
FMSEL1
FMSEL2
NERRI
BYP EBIS TRI
CONTROL
LOGIC
OVT
PoDo
1
BYPR
ENCODER LINK
REQUEST
DETECTION
OVT
PoDo
OVERTEMP
POWER DOWN
Q1
NQ1
NERR
iC-HF
Channels 5 and 6 are configured as RS-422 input
drivers. Channel 5 carries MA signal and delivers it
to the sensor through pin X5 in a single ended signal.
Channel 6 does the same with SLI signal.
Figure 11: A/B/Z and BiSS/SSI mode, 6 lines in En-
coder Link State
1 μF
SLO
VDDS
GNDS
X1
NX1
X2
NX2
X3
NX3
X4
VDD
3..5.5V
REVERSE POLARITY PROTECTION GND
1 μF
RS422 Output
Q1
TRI
NQ1
Q2
RS422 Output
NQ2
Q3
RS422 Output
NQ3
RS422 Ouput
Q4
TRI
NQ4
SLO
MA
X5
RS422 Input Q5
+
_
TRI
NQ5
MA
SLI
X6
RS422 Input Q6
+
_
TRI
NQ6
SLI
PTC
ECM
OEN
FMSEL1
FMSEL2
NERRI
BYP EBIS TRI
CONTROL
LOGIC
OVT
PoDo
1
BYPR
ENCODER LINK
REQUEST
DETECTION
OVT
PoDo
OVERTEMP
POWER DOWN
Q1
NQ1
NERR
iC-HF
Figure 10: A/B/Z and BiSS/SSI mode, 3 channels
line driver
To enter Encoder Link State, ECM pin must be set hi
and two signals must be input at pins Q1 and NQ1
following a specific timing sequence. This timing se-
quence is called the Encoder Link Sequence. For more
information about entering Encoder Link State on page
20.
BiSS bus structure
If FMSEL2 = 1 and FMSEL1 = 1, iC-HF is configured in
BiSS bus structure mode. This mode allows to com-
municate with a sensor BiSS and including the sensor
in a BiSS bus structure/topology. Signals will follow
RS-422 protocol, making it suitable for industrial envi-
ronments. For using this mode it is necessary that the
sensor connected to iC-HF has an BiSS bus compatible
interface.
In BiSS bus structure mode each differential channel
carries a specific line from BiSS bus:
In A/B/Z and BiSS/SSI mode it is possible to enter En-
coder Link State. Only channels 1, 2 and 3 can enter
Encoder Link state in this mode. Signals at pins X1
to X3 are directly linked to output pins Q1 to Q3 and
signals at pins NX1 to NX3 to output pins NQ1 to NQ3.
Altogether, 6 lines are available in A/B/Z and BiSS/SSI
mode under Encoder Link State.
Channel Number
1
2
3
4
5
6
Input/Output
output
output
output
input
input
input
BiSS Signal
MA output
SLO
SL output
MA input
SLI
SL input
Table 5: Differential channel function in BiSS bus struc-
ture mode