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iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 1/7 FEATURES 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 APPLICATIONS Optical position decoding for incremental encoders using the principle of differential scanning
CHIP
A+ B-
B+ A-
Z
chip size 4.02mm x 3.24mm
BLOCK DIAGRAM
+5V
VCC
CLR 100nF
CODE DISC
A DPA DPB TRACK A
OUT_A
+5V LED
DNB
DNA TRACK B
B
OUT_B
RETICLE
RLED 68
iC-OW
DZ Z TRACK Z TIP LEDTIN NTEST TEST
ERROR OUT_Z
NERR
NERR
LED DRIVER GND
LED-CURRENT CONTROL CLR
CLR 10nF
ILR
RLR 15k
IZ
RZ 15k
AGND
(c) 2001 iC-Haus GmbH Integrated Circuits Am Kuemmerling 18, D-55294 Bodenheim
Tel +49-6135-9292-0 Fax +49-6135-9292-192 http://www.ichaus.com
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 2/7 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 VCC A B Z NERR LED CLR IZ ILR GND AGND Function +5V Supply Voltage Track A Output Track B Output Track Z Output Error Output (low active) / AND Gate Disable Input LED Current Control Output Capacitor for LED Current Control Index Track Threshold Adjust LED Current Control Setup Ground Reference Ground for ILR, IZ, CLR circuitry Positive Test Aid Input Negative Test Aid Input Test Enable Input, low active
ILR IZ CLR LED
A+ BTIP TIN NTEST
B+ A-
NERR
Z B
Z
AGND GND
A VCC
TIP TIN NTEST
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 3/7 ABSOLUTE MAXIMUM RATINGS
Values beyond which damage may occur; device operation is not guaranteed. Item Symbol Parameter Conditions Fig. Min. G001 VCC G002 V(A,B,Z) G003 I(A,B,Z) G004 I(ILR) I(IZ) G005 I(CLR) G006 I(LED) G007 I(LED) Supply Voltage Voltage at Outputs A, B, Z Current in Outputs A, B, Z Current in ILR, IZ Current in CLR Current in LED Current in LED V(LED)> VCC V(LED)# VCC V(A,B,Z)< 0V or V(A,B,Z)> VCC 0 -0.3 -4 -6 -1 -1 -1 -0.3 V(NERR)< 0 or V(NERR)> VCC -4 -25 -40 Max. 6 VCC+0.3 4 1 1 1 60 VCC+0.3 4 120 150 V V mA mA mA mA mA V mA C C Unit
G008 V(NERR) Voltage at NERR G009 I(NERR) TG1 Tj TG2 Tj Current in NERR Operating Junction Temperature Storage Temperature Range
THERMAL DATA
Operating Conditions: VCC= 5V 10% Item Symbol Parameter Conditions Fig. Min. T1 Ta Operating Ambient Temperature Range (extended range on request) -25 Typ. Max. 125 C Unit
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.
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 4/7 ELECTRICAL CHARACTERISTICS
Operating Conditions: VCC= 5V 10%, RZ= RLR= 15kS, CLR= 10nF, 8= 850nm, Tj= -25..125C, unless otherwise noted Item Symbol Parameter Conditions Tj C Total Device 001 VCC 002 I(VCC) Permissible Supply Voltage 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) see 002; I(DZ,DPx)= -40..0nA I(DNx)= -400nA sinusoidal waveform, I(DPx)= -20..-400nA, I(DNx)= -400..-20nA rectangular waveform, I(DZ)= -20..-400nA 27 500 5.5 4.5 5.5 10 V mA Fig. Min. Typ. Max. Unit
003 I(VCC) 004 fo
Supply Current in VCC, Outputs A, B, Z lo Cut-off Frequency for Tracks A and B Cut-off Frequency for Index Track Z Propagation Delay Deviation track vs.track at A, B, Z
12
mA mA kHz
005 fo 006
250 100
kHz ns
)tp()
Photodiodes 007 Aph() 008 S(8)max 009 Sar(8) Radiant Sensitive Area Spectral Sensitivity Spectral Application Range Sar(8)= 0.1 x S(8)max 500 diodes DPA, DNA, DPA, DPB diode DZ 0.95 x 0.74 2.00 x 0.74 0.5 1050 mm2 mm2 A/W A/W
Differential Photocurrent Amplifier, Tracks A and B 101 I(DPx) I(DNx) Permissible Sensor Current at DPA, DNA, DPB, DNB -600 0.85 1 0 1.15 nA
102 CM(P/N) Common Mode DPA vs. DNA, DPB vs. DNB 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 -25 27 70 125 0.9 0.8 0.75 0.7 1.2 1.1 1.05 1.05 1.1 1.0 0.9 0.9 1.5 1.4 1.3 1.3 0.4 0.5 -8 2 -1.7 13 V V V V V V V V V V mA mA
302 Vs()hi
Saturation Voltage hi
Vs()hi= VCC -V(); I()= -1.6mA
303 Vs()lo 304 Isc()hi 305 Isc()lo
Saturation Voltage lo Short-Circuit Current hi Short-Circuit Current lo
I()= 0.8mA I()= 1.6mA V()= 0V..2.8V V()= 1V..VCC
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 5/7 ELECTRICAL CHARACTERISTICS
Operating Conditions: VCC= 5V 10%, RZ= RLR= 15kS, CLR= 10nF, 8= 850nm, Tj= -25..125C, unless otherwise noted Item Symbol Parameter Conditions Tj C Push-Pull Outputs A, B, Z (continued) 306 Vc()hi 307 Vc()lo Clamp Voltage hi Clamp Voltage lo Vc()hi= V()-VCC; I()= 4mA I()=-4mA 0.4 -1.5 1.5 -0.4 V V Fig. Min. Typ. Max. Unit
LED Current Control: CLR, ILR, IZ, LED 601 ISUM 602 I(LED) Permissible Total Photocurrent Permissible Driver Current in LED I(LED)= 50mA, I(ILR)> 5A, ISUM= 0 I(ILR,IZ)= -150..-5A V(ILR)= 0, V(IZ)= 0 closed LED control loop, ISUM= -800..-50nA closed LED control loop, I(DZ)= -400..-10nA VCC= 0V, I()= 1mA VCC= 0V, I()= -1mA 27 1.15 -5 80 320 0.4 -1.0 100 400 125 500 1.0 -0.4 V V ISUM= I(DPA)+I(DNA) +I(DPB) +I(DNB) -1500 0.1 0.4 0.8 1.22 1.28 -50 50 1.2 nA mA V V V mA
603 Vs(LED) Saturation Voltage lo at LED 604 Vref() 606 Isc() 607 CR1() 608 CR2() 609 Vc()hi 610 Vc()lo Reference Voltage at ILR, IZ Short-Circuit Current in ILR, IZ Current Ratio I(ILR)/ISUM Current Ratio I(IZ)/I(DZ) Clamp Voltage hi at LED, CLR, ILR, IZ Clamp Voltage lo at LED, CLR, ILR, IZ
Error Output / AND Gate Disable Input NERR 501 R() 502 Vt() 701 Vs()lo 702 Isc()lo 703 Vc()hi 704 Vc()lo Internal Pull-Up Resistor AND Gate Turn-Off Threshold Saturation Voltage lo Short-Circuit Current lo Clamp Voltage hi Clamp Voltage lo Gate disabled if V(NERR)< 0.4V I(NERR)= 1.6mA I(NERR)= 5mA V(NERR)= 2V..VCC Vc()hi= V(NERR)-VCC; NERR=hi, I(NERR)= 4mA NERR=lo, I(NERR)=-4mA 5 0.4 -1.5 20 0.4 30 45 1 0.4 0.8 30 1.5 -0.4 kS V V V mA V V
Test Aid Inputs TIP, TIN, NTEST A01 CR1() Current Ratio I(TIP) / I(DPA,DPB,DZ) and I(TIN) / I(DNA,DNB) Current Ratio I(TIP,TIN) / I(CLR) Test Aid Operation Voltage at TIP, TIN Pull-Down Current at TIP, TIN Pull-Up Resistor at NTEST Voltage at NTEST Threshold Voltage lo at NTEST NTEST= lo, I()= 5..200A 300 400 550
A02 CR2() A03 V()on A04 Ipd() A05 Rpu() A06 V0() A07 Vt()
NTEST= lo, I()= 5..200A NTEST= lo; I()= 5..200A V(NTEST) open, V(TIP,TIN)< 1V V(NTEST)= 0..0.4V I(NTEST)= 0
1.8 1.2 50 80 0.35
2
2.2 2.6 500 V A kS V V
210 0.7
550 1.0 0.3
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 6/7 APPLICATIONS INFORMATION Figure 1 shows the schematic of the electronic system of an incremental rotary encoder. iC-Haus devices iC-OW and line driver iC-WE are used. The rotary encoder requires the supply voltages VCC= +5V and VB= +5V to +30V (line driver) and supplies the conditioned signals of tracks A and B and index track Z at the outputs. It is possible to transmit these signals over lines of 100m in length directly connected to the device. The system's upper cut-off frequency is typically 300kHz for tracks A and B. Internal monitoring functions are available for the chip temperature of the line driver, for the supply voltages and for the LED current control. The ERROR port provides an error message signal which can be logically linked to other, external error signals by a simple connection.
Fig. 1: incremental encoder application circuit
iC-OW
INCREMENTAL OPTO ENCODER
Rev A1, Page 7/7 ORDERING INFORMATION
Type iC-OW
Package -
Order designation iC-OW chip
For information about prices, terms of delivery, options for other case types, etc., please contact: iC-Haus GmbH Am Kuemmerling 18 D-55294 Bodenheim GERMANY Tel +49-6135-9292-0 Fax +49-6135-9292-192 http://www.ichaus.com
This specification is for a newly developed product. iC-Haus therefore reserves the right to modify data without further notice. Please contact us to ascertain the current data. The data specified is intended solely for the purpose of product description and is not to be deemed guaranteed in a legal sense. Any claims for damage against us - regardless of the legal basis - are excluded unless we are guilty of premeditation or gross negligence. We do not assume any guarantee that the specified circuits or procedures are free of copyrights of third parties. Copying - even as an excerpt - is only permitted with the approval of the publisher and precise reference to source.

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