IC-MQ_15 Datasheet, PDF (40/43 Pages) IC-Haus GmbH – Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
APPLICATION NOTES: CIRCUIT EXAMPLES
Rev F3, Page 40/43
Figure 26 is a circuit diagram of an optical encoder
with an incremental output of quadrature signals as
RS422-compatible differential signals which can be ter-
minated by 100 Ω at the controller end. By way of an
alternative the magnetic encoder in Figure 27 uses
magneto-resistive sensor bridges. An external overvolt-
age protection circuit may be realized employing TVS
diodes plus a PolyFuse in the VDD line, for instance.
C1
100nF
Disc
iC-LSHB
VCC
PSIN
DLED
RLED
47
PSIN
PCOS NSIN
C2
100nF
VP
SCL
24xx
VN^SDA
NCOS
NSIN
PCOS
NCOS
PZ
PZ
NZ
NZ
GND
R1
R2
2.2k
2.2k
C5
100nF
SCL
VDDS
VDD
I2C
SDA
ACO
SIGNAL
LEVEL
CONTROL
Reverse
Polarity
Protection
iC-MQ
X4 ₊
- ^X6
X3 ₊
- ^X5
X1 ₊
- ^X2
GNDS
GND
C3
100nF
ERR
C4
1μF
R3
1k
DLED
PZ
NZ
PB
NB
PA
NA
TVS-Diode-Array
Figure 26: Optical encoder application example.
F1
+5V
D1
5.6V
ERR
PZ
NZ
PB
NB
PA
NA
0V
C2
100nF
VP
SCL
24xx
SDA
VN
MR2
MR1
MR0
R1
R2
2.2k
2.2k
C5
100nF
SCL
VDDS
VDD
I2C
SDA
ACO
SIGNAL
LEVEL
CONTROL
Reverse
Polarity
Protection
iC-MQ
R1
1K
X4 ₊
- ^X6
X3 ₊
- ^X5
X1 ₊
- ^X2
R2
1K
GNDS
GND
C3
100nF
ERR
C4
1μF
R3
1k
DLED
PZ
NZ
PB
NB
PA
NA
F1
+5V
D1
5.6V
ERR
PZ
NZ
PB
NB
PA
NA
0V
TVS-Diode-Array
Figure 27: Magnetic encoder application example.
When iC-MQ is used in 24 V systems, with supply volt-
ages of 5 V to 30 V for example, it can be combined
with iC-DL which acts as a line driver with an integrated
line adaptation feature (Figure 28).
A reduced driving capability of iC-MQ is sufficient
(SIK = 00) to operate iC-DL so that the current required
is reduced at the 5 V end. If an LDO voltage regulator
is selected, the circuit is suitable for a supply range of
4.5 V to 30 V without any changes having to be made.
The wiring of the iC-DL error message output (pin NER)
to the PLC is not necessary if the iC-MQ error mask
is set for output shutdown (EMASKO). In the event of
error the pull-down current sources ensure that a low
signal is produced at the iC-DL inputs on all lines which