iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 1/7
B -
A+
B+
A -
Z
chip size 4.02mm x 3.24mm
FEATURES
APPLICATIONS
Monolithically integrated photodiodes
Excellent matching, high reliability
Differential scanning for tracks A and B
Adjustable threshold for index track Z
Gated index Z with switch-off capability
Adjustable LED current control compensates for temperature
and system ageing effects
50mA LED driver integrated
Control monitoring with alarm output
Electronic test aids
Track outputs TTL-compatible and short-circuit-proof
ESD protection
Optical position decoding for
incremental encoders using the
principle of differential scanning
CHIP
BLOCK DIAGRAM
2001
iC-Haus GmbH
Tel +49-6135-9292-0
Integrated Circuits
Fax +49-6135-9292-192
Am Kuemmerling 18, D-55294 Bodenheim
http://www.ichaus.com
DPB
DNA
DZ
DPA
DNB
ILR
IZ
LED
NERR
NTEST
TIN
TIP
VCC
Z
A
AGND
B
CLR
GND
+5V
OUT_A
NERR
OUT_B
OUT_Z
+5V
RLR
15k
iC-OW
DRIVER
LED-
LED-CURRENT CONTROL
ERROR
TRACK A
TRACK B
TRACK Z
LED
CLR
10nF
15k
RZ
68
RLED
100nF
CLR
RETICLE
CODE
DISC
TEST
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 2/7
B -
A+
B+
A -
Z
TIP
TIN
NTEST
AGND
GND
VCC
A
B
Z
NERR
LED
CLR
IZ
ILR
DESCRIPTION
iC-OW is an evaluator iC for optical incremental linear and rotary motion sensors, such as glass scales or
shaft encoders, for example. A photodiode array, amplifiers, comparators and TTL-compatible push-pull
output drivers are integrated monolithically.
Two tracks, A and B, are evaluated differentially, with index track Z as constant light. The integrated LED
current control with a driver stage enables a transmitter LED with a series resistor to be directly connected to
the device and ensures a constant optical receive power. Two external resistors are used to set the
comparator threshold of the relative index track and to determine the receive photocurrents.
The internal logical AND operation of index track Z to tracks A and B can be switched off for adjustment.
A monitoring circuit generates an error message when the LED current control range is violated. The error
output, designed as an open collector, is low active and functions simultaneously as an input which can turn
off the AND operation of the index track.
All pins are protected against destruction by ESD. The outputs are short-circuit-proof.
CHIP LAYOUT
PAD DESCRIPTION
Name
Function
VCC
+5V Supply Voltage
A
Track A Output
B
Track B Output
Z
Track Z Output
NERR
Error Output (low active) / AND Gate
Disable Input
LED
LED Current Control Output
CLR
Capacitor for LED Current Control
IZ
Index Track Threshold Adjust
ILR
LED Current Control Setup
GND
Ground
AGND
Reference Ground for
ILR, IZ, CLR circuitry
TIP
Positive Test Aid Input
TIN
Negative Test Aid Input
NTEST
Test Enable Input, low active
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 3/7
All voltages are referenced to ground unless otherwise noted.
All currents into the device pins are positive; all currents out of the device pins are negative.
ABSOLUTE MAXIMUM RATINGS
Values beyond which damage may occur; device operation is not guaranteed.
Item
Symbol
Parameter
Conditions
Fig.
Unit
Min.
Max.
G001 VCC
Supply Voltage
0
6
V
G002 V(A,B,Z)
Voltage at Outputs A, B, Z
-0.3
VCC+0.3
V
G003 I(A,B,Z)
Current in Outputs A, B, Z
V(A,B,Z)< 0V or V(A,B,Z)> VCC
-4
4
mA
G004 I(ILR)
I(IZ)
Current in ILR, IZ
-6
1
mA
G005 I(CLR)
Current in CLR
-1
1
mA
G006 I(LED)
Current in LED
V(LED)> VCC
-1
1
mA
G007 I(LED)
Current in LED
V(LED)
#
VCC
-1
60
mA
G008 V(NERR) Voltage at NERR
-0.3
VCC+0.3
V
G009 I(NERR)
Current in NERR
V(NERR)< 0 or V(NERR)> VCC
-4
4
mA
TG1 Tj
Operating Junction Temperature
-25
120
C
TG2 Tj
Storage Temperature Range
-40
150
C
THERMAL DATA
Operating Conditions: VCC= 5V 10%
Item
Symbol
Parameter
Conditions
Fig.
Unit
Min.
Typ.
Max.
T1
Ta
Operating Ambient Temperature
Range
(extended range on request)
-25
125
C
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 4/7
ELECTRICAL CHARACTERISTICS
Operating Conditions: VCC= 5V 10%, RZ= RLR= 15k
S
, CLR= 10nF,
8
= 850nm, Tj= -25..125C, unless otherwise noted
Item
Symbol
Parameter
Conditions
Tj
Fig.
Unit
C
Min.
Typ.
Max.
Total Device
001
VCC
Permissible Supply Voltage
4.5
5.5
V
002
I(VCC)
Supply Current in VCC,
Outputs A, B, Z hi
closed LED control loop, I(LED)
.
3mA, NERR= hi, I(A,B,Z)= 0;
I(DZ,DPx)= -400nA,
I(DNx)= -40..0nA, (x= A,B)
10
mA
003
I(VCC)
Supply Current in VCC,
Outputs A, B, Z lo
see 002; I(DZ,DPx)= -40..0nA
I(DNx)= -400nA
27
5.5
12
mA
mA
004
fo
Cut-off Frequency
for Tracks A and B
sinusoidal waveform,
I(DPx)= -20..-400nA,
I(DNx)= -400..-20nA
500
kHz
005
fo
Cut-off Frequency
for Index Track Z
rectangular waveform,
I(DZ)= -20..-400nA
250
kHz
006
)
tp()
Propagation Delay Deviation
track vs.track at A, B, Z
100
ns
Photodiodes
007
Aph()
Radiant Sensitive Area
diodes DPA, DNA, DPA, DPB
diode DZ
0.95 x 0.74
2.00 x 0.74
mm
2
mm
2
008
S(
8
)max
Spectral Sensitivity
0.5
A/W
009
Sar(
8
)
Spectral Application Range
Sar(
8
)= 0.1 x S(
8
)max
500
1050
A/W
Differential Photocurrent Amplifier, Tracks A and B
101
I(DPx)
I(DNx)
Permissible Sensor Current at
DPA, DNA, DPB, DNB
-600
0
nA
102
CM(P/N) Common Mode DPA vs. DNA,
DPB vs. DNB
0.85
1
1.15
Comparators, Tracks A and B
201
Hys
Hysteresis referred to
[I(DPx) + I(DNx)] / 2
I(DPx,DNx)= -400..0nA
15
20
25
%
Photocurrent Amplifier, Index Track Z
401
I(DZ)
Permissible Sensor Current at DZ
-600
0
nA
Comparator, Index Track Z
801
Hys
Hysteresis referred to I(DZ)
I(DZ)= -400..0nA
7
10
13
%
Push-Pull Outputs A, B, Z
301
Vs()hi
Saturation Voltage hi
Vs()hi= VCC -V();
I()= -400A
-25
27
70
125
0.9
0.8
0.75
0.7
1.1
1.0
0.9
0.9
V
V
V
V
302
Vs()hi
Saturation Voltage hi
Vs()hi= VCC -V();
I()= -1.6mA
-25
27
70
125
1.2
1.1
1.05
1.05
1.5
1.4
1.3
1.3
V
V
V
V
303
Vs()lo
Saturation Voltage lo
I()= 0.8mA
I()= 1.6mA
0.4
0.5
V
V
304
Isc()hi
Short-Circuit Current hi
V()= 0V..2.8V
-8
-1.7
mA
305
Isc()lo
Short-Circuit Current lo
V()= 1V..VCC
2
13
mA
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 5/7
ELECTRICAL CHARACTERISTICS
Operating Conditions: VCC= 5V 10%, RZ= RLR= 15k
S
, CLR= 10nF,
8
= 850nm, Tj= -25..125C, unless otherwise noted
Item
Symbol
Parameter
Conditions
Tj
Fig.
Unit
C
Min.
Typ.
Max.
Push-Pull Outputs A, B, Z (continued)
306
Vc()hi
Clamp Voltage hi
Vc()hi= V()-VCC; I()= 4mA
0.4
1.5
V
307
Vc()lo
Clamp Voltage lo
I()=-4mA
-1.5
-0.4
V
LED Current Control: CLR, ILR, IZ, LED
601
ISUM
Permissible Total Photocurrent
ISUM= I(DPA)+I(DNA) +I(DPB)
+I(DNB)
-1500
-50
nA
602
I(LED)
Permissible Driver Current in LED
0.1
50
mA
603
Vs(LED)
Saturation Voltage lo at LED
I(LED)= 50mA,
I(ILR)> 5A, ISUM= 0
27
0.4
0.8
1.2
V
V
604
Vref()
Reference Voltage at ILR, IZ
I(ILR,IZ)= -150..-5A
1.15
1.22
1.28
V
606
Isc()
Short-Circuit Current in ILR, IZ
V(ILR)= 0, V(IZ)= 0
-5
mA
607
CR1()
Current Ratio I(ILR)/ISUM
closed LED control loop,
ISUM= -800..-50nA
80
100
125
608
CR2()
Current Ratio I(IZ)/I(DZ)
closed LED control loop,
I(DZ)= -400..-10nA
320
400
500
609
Vc()hi
Clamp Voltage hi
at LED, CLR, ILR, IZ
VCC= 0V, I()= 1mA
0.4
1.0
V
610
Vc()lo
Clamp Voltage lo
at LED, CLR, ILR, IZ
VCC= 0V, I()= -1mA
-1.0
-0.4
V
Error Output / AND Gate Disable Input NERR
501
R()
Internal Pull-Up Resistor
20
30
45
k
S
502
Vt()
AND Gate Turn-Off Threshold
Gate disabled if V(NERR)< 0.4V
0.4
1
V
701
Vs()lo
Saturation Voltage lo
I(NERR)= 1.6mA
I(NERR)= 5mA
0.4
0.8
V
V
702
Isc()lo
Short-Circuit Current lo
V(NERR)= 2V..VCC
5
30
mA
703
Vc()hi
Clamp Voltage hi
Vc()hi= V(NERR)-VCC;
NERR=hi, I(NERR)= 4mA
0.4
1.5
V
704
Vc()lo
Clamp Voltage lo
NERR=lo, I(NERR)=-4mA
-1.5
-0.4
V
Test Aid Inputs TIP, TIN, NTEST
A01 CR1()
Current Ratio
I(TIP) / I(DPA,DPB,DZ)
and I(TIN) / I(DNA,DNB)
NTEST= lo, I()= 5..200A
300
400
550
A02 CR2()
Current Ratio
I(TIP,TIN) / I(CLR)
NTEST= lo, I()= 5..200A
1.8
2
2.2
A03 V()on
Test Aid Operation Voltage
at TIP, TIN
NTEST= lo; I()= 5..200A
1.2
2.6
V
A04 Ipd()
Pull-Down Current at TIP, TIN
V(NTEST) open, V(TIP,TIN)< 1V
50
500
A
A05 Rpu()
Pull-Up Resistor at NTEST
V(NTEST)= 0..0.4V
80
210
550
k
S
A06 V0()
Voltage at NTEST
I(NTEST)= 0
0.35
0.7
1.0
V
A07 Vt()
Threshold Voltage lo at NTEST
0.3
V
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