iC-MSBSAFETY, iC-MSB2
SIN/COS SIGNAL CONDITIONER WITH 1Vpp DRIVER
Rev D2, Page 27/29
APPLICATION HINTS
Connecting MR sensor bridges for safety-related applications
For safety-related applications iC-MSBSAFETY requires an external overvoltage protection of supply VDD (Zener
diode with fuse, for instance) and external pull-down resistors at the inputs X3 to X6 towards GNDS (of up to
100 kΩ).
F1
+5V
C1
100nF
C2
100nF
R6
R5
2.2kS 2.2kS
D1
5.6V
VP
SCL
VDDS
VDD
SCL
I2C
ERR
24xx
ERR
SDA
ACO
SDA
VN
iC-MSB
SIGNAL
LEVEL
PZ
NZ
PC
NC
PS
NS
CONTROL
RL
MR0
100S
X1
X2
+
-
INPUT ZERO
MR1
RL
100S
X3
X5
+
-
R1
R2
100kS
INPUT COS
100kS
MR2
X4
X6
+
RL
100S
-
R3
R4
INPUT SIN
100kS 100kS
GNDS
GND
0V
TVS diode array
Figure 7: Example circuit for safety-related applications with iC-MSBSAFETY
.
PLC Operation
ther the supply VDD nor the output pins, which are
There are PLCs with a remote sense supply which re- also monitored, must fall to below ground potential (pin
quire longer for the voltage regulation to settle. At the GND); otherwise the device is not configured and the
same time the PLC inputs can have high-impedance outputs remain permanently set to tristate.
resistances versus an internal, negative supply voltage
which define the input potential for open inputs.
In order to ensure that iC-MSB starts with the PLCs
In this instance iC-MSB’s reverse polarity protection mentioned above pull-up resistors can be used in the
feature can be activated as the outputs are tristate dur- encoder. Values of 100 kΩ are usually sufficient; it
ing the start phase and the resistances in the PLC de- is, however, recommended that PLC specifications be
termine the pin potential. During the start phase nei- specifically referred to here.
ICHAUS [ IC-HAUS GMBH ]
