IC-OV [ICHAUS]
5-BIT OPTO ENCODER; 5位光电编码器
| 型号： | IC-OV |
| 厂家： | 
IC-HAUS GMBH |
| 描述： | 5-BIT OPTO ENCODER |
| 文件： | 总9页 (文件大小：412K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
iC-OV
5-BIT OPTO ENCODER
FEATURES
APPLICATIONS
°
High synchronism and technical reliability due to monolithic
construction plus integrated photodiodes
Short track pitch (600 µm)
Scanning with constant-light evaluation
Photoelectric amplifier with high cut-off frequency
Current comparators with hysteresis
Current-limited TTL-compatible push-pull outputs
Adjustable LED current control for constant receive power
Integrated 40mA driver for the LED
Integrated test aid
Output of track 1 can be inverted to change the counting
direction during Gray Code scanning
°
Scanning with constant-light
evaluation in absolute and
multiturn rotary encoders
°
°
°
°
°
°
°
°
°
CHIP
°
°
Overtemperature circuit-breaker with hysteresis
Detection and fault message when the safe operating range
is exceeded, as the result of undervoltage, over-temperature
or an LED current outside the control range
Low power consumption
°
3.6mm × 2.9mm
BLOCK DIAGRAM
+5V
8
1.0
VCC
CB
100nF
Vref
0.5
12
11
AGND
ISET
RLED
47
1
LED
RSET
14k
DREF
DDC
1
1
LED
MONITOR
IS
LED-CURRENT CONTROL
7
C5
TRACK5
TRACK4
TRACK3
(see TRACK2)
(see TRACK2)
(see TRACK2)
6
C4
5
C3
4
2
C2
TRACK2
TRACK1
3
2
C1
5..25V
14
NINV
iC-OV
RNER
10k
BLCC OVC3
THERMAL
SHUTDOWN
13
1
c2
1
c2
NER
GND
9
TREF
TNRF
LOW VOLTAGE
2
10
TEST
BIAS
ERROR
© 2000
Rev C0
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-OV
5-BIT OPTO ENCODER
Rev C0, 2/9
DESCRIPTION
The device iC-OV is an optoelectronic encoder IC for absolute linear or angle measuring systems, e.g. glass
scales or rotary encoders.
Photodiodes, amplifiers, comparators and TTL-compatible push-pull output drivers for 5 tracks are
monolithically integrated, as well as a reference photodiode to control the LED current. The track pitch is 600
µm.
The outputs switch to high when the amplified photoelectric currents exceed a preset threshold (constant-light
evaluation). The operating point is determined by an external resistor at RSET.
This resistor also establishes the setpoint for the LED current control. The control keeps the optical receive
power constant, irrespective of the temperature or the effects of ageing. The driver stage of the LED current
control makes it possible to connect an LED with series resistor directly.
A monitoring circuit generates a fault message in the event of undervoltage, overtemperature or violation of
the LED current control range. The fault message output is busable (open collector) and low active.
Two test pins permit a complete function test (without photodiodes).
All inputs and outputs are protected against destruction by ESD. The outputs are short-circuit-proof and are
switched off in case of thermal overload.
iC-OV
5-BIT OPTO ENCODER
Rev C0, Page 3/9
CHIP LAYOUT
dimensions in µm; chip size 3.6mm x 2.9mm
PAD DESCRIPTION
Name
Function
LED
GND
C1
C2
C3
C4
C5
VCC
TREF
TNRF
ISET
LED Current Control Output
Ground
Track 1 Push-Pull Output
Track 2 Push-Pull Output
Track 3 Push-Pull Output
Track 4 Push-Pull Output
Track 5 Push-Pull Output
+5V Supply Voltage
Test Aid for photodiode DREF
Test Aid for tracks 1 to 5 and compensation DDC
LED Current Control Setup
AGND Reference Ground for ISET circuitry
NER
Error Message Output, low active
NINV
Track 1 Invert Mode Input, low active
iC-OV
5-BIT OPTO ENCODER
Rev C0, Page 4/9
ABSOLUTE MAXIMUM RATINGS
Values beyond which damage may occur; device operation is not guaranteed.
Item Symbol Parameter
Conditions
Fig.
Unit
Min.
0
Max.
G001 VCC
G002 V(C)
G003 I(C)
Supply Voltage
7
VCC
3
V
Voltage at Outputs C1..5
Current in Outputs C1..5
0
V
V(C)< 0V or V(C)> VCC
-3
-2
-2
-2
-5
0
mA
mA
mA
mA
mA
mA
mA
V
G004 I(TNRF) Current in TNRF
G005 I(TREF) Current in TREF
1
1
G006 I(ISET)
Current in ISET
2
G007 I(AGND) Current in AGND
5
G008 I(LED)
G009 I(LED)
Current in LED to GND
Current in LED
50
3
V(LED)> VCC
0
G010 V(NER) Voltage at NER
0
30
2
G011 I(NINV)
TG1 Tj
Current in NINV
-2
-30
mA
C
Junction Temperature
Storage Temperature
125
TG2 Ts
see package specification
THERMAL DATA
Operating Conditions: VCC= 5V ±10%
Item Symbol Parameter
Conditions
Fig.
Unit
Min.
Typ.
Max.
T1 Ta
Operating Ambient Temperature
Range
see package specification
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-OV
5-BIT OPTO ENCODER
Rev C0, Page 5/9
ELECTRICAL CHARACTERISTICS
Operating Conditions:
VCC= 5V ±10%, Tj= -25..125 C, unless otherwise noted
Item Symbol Parameter
Conditions
Tj
Fig.
Unit
C
Min.
Typ.
Max.
Total Device
001 VCC
Permissible Supply Voltage
Range
4.5
5.5
13
V
002 I(VCC)
Supply Current in VCC,
Outputs C1..5 hi
closed LED Control:
7
8
mA
R(ISET/AGND)= 14k ,
I(LED) 10mA, NER= hi;
I(C1..5)= 0, I(D1..5)= 80nA
003 I(VCC)
004 fo
Supply Current in VCC,
Outputs C1..5 lo
closed LED Control:
15
mA
R(ISET/AGND)= 14k ,
I(LED) 10mA, NER= hi;
I(C1..5)= 0, I(D1..5) 8nA
Cut-off Frequency,
tracks 1..5
sinusoidal waveform,
I(D1..5)= 8..80nA, I(DREF)= 80nA
200
500
kHz
µs
005
tp()
Delay Skew C1..5
rectangular waveform,
I(D1..5)= 8..80nA, I(DREF)= 80nA
0.5
Photodiodes D1..5, DREF
006 S( )max Spectral Sensitivity
= 850nm
0.5
A/W
nm
007 ar
Spectral Application Range
Se( ar)= 0.1×S( )max
1050
Photodiodes D1..5 with Amplifiers
101 Aph(D)
102 CM()
Radiant Sensitive Area
0.2 × 0.1
1
mm²
Common Mode referred to
Reference Photodiode DREF
0.85
8
1.15
16
Difference Comparators, tracks 1..5
201 Hys
Hysteresis referred to
[I(D) + IS] /2
I(D1..5)= 0..80nA
12
%
Push-Pull Outputs C1..5
301 Vs()hi
Saturation Voltage hi
Vs()hi= VCC-V(C);
I()= -1.6mA
1.4
V
V
27
1.1
302 Vs()lo
Saturation Voltage lo
I()= 1.6mA
-25
27
85
0.4
0.4
0.4
0.5
V
V
V
V
0.25
125
303 Isc()hi
304 Isc()lo
Short-Circuit Current hi
Short-Circuit Current lo
V()= 0..2.8V
9
mA
mA
27
27
4
V()= 2V..VCC
10
mA
mA
5
305 tr()
Rise Time
C: lo hi; CL= 30pF
C: hi lo; CL= 30pF
80
40
260
100
1.5
ns
ns
V
306 tf()
Fall Time
307 Vc()hi
Clamp Voltage hi
Vc()hi= V(C)-VCC;
I()= 3mA
0.4
308 Vc()lo
Clamp Spannung lo
I()= -3mA
-1.5
-0.4
V
Test Aid TNRF, TREF
401 CR()
Current Ratio
I(TNRF)/I(D1..5)
test aid active,
I()= 2..200µA
200
400
550
800
402 CR()
Current Ratio
I(TNRF)/I(DDC),
I(TREF)/I(DREF)
test aid active,
I()= 2..200µA
1100
1600
iC-OV
5-BIT OPTO ENCODER
Rev C0, Page 6/9
ELECTRICAL CHARACTERISTICS
Operating Conditions:
VCC= 5V ±10%, Tj= -25..125 C, unless otherwise noted
Item Symbol Parameter
Conditions
Tj
Fig.
Unit
C
Min.
Typ.
Max.
Test Aid TNRF, TREF (continued)
403 It()
Pull-Down Current
(Test Aid Turn-on Threshold)
V()= 0.5V
2
150
µA
µA
µA
µA
µA
-25
27
85
14
17
21
23
125
404 V()on
Turn-on Voltage
test aid active; I(TNRF)= 2..200µA -25
1.9
1.6
1.3
1.1
2.4
2.1
1.8
1.6
2.7
2.4
2.1
1.9
V
V
V
V
and I(TREF)= 100µA, or
I(TNRF)= 100µA and
I(TREF)= 2..200µA
27
85
125
LED Current Control with Reference Photodiode DREF
501 Aph() Radiant Sensitive Area DREF
502 I(DREF) Permis. Photocurrent at DREF
503 I(LED) Permis. Driver Current in LED
0.2 × 0.1
mm²
nA
10
0
200
40
mA
V
504 Vs(LED) Saturation Voltage at LED
I(LED)= 40mA, I(ISET)>10µA,
I(DREF)=0
0.4
0.9
1.4
505 V(ISET) Voltage at ISET
I(ISET)= -100..-10µA
V(ISET)= 0
1.14
1.22
1.28
1.3
V
506 Isc()
507 CR()
508 CR()
Short-Circuit Current in ISET
mA
mA
27
0.5
Current Ratio
I(ISET)/I(DREF)
closed LED control,
I(DREF)= 20..200nA
720
840
1080
1820
1440
Current Ratio
closed LED control,
I(DREF)= 60..120nA
1080
I(ISET)/I(DREF)
509 Vc()hi
510 Vc()lo
Clamp Voltage hi at ISET, LED
Clamp Voltage lo at ISET, LED
VCC= 0, I()= 3mA
VCC= 0, I()= -3mA
0.4
1.5
V
V
-1.5
-0.4
Inverting Mode Input NINV
601 Vt()
Threshold Voltage hi
0.5
1
V
µA
µA
V
602 Ipu()
603 Ipu()
604 Vc()hi
605 Vc()lo
Pull-Up Current
Pull-Up Current
Clamp Voltage hi
Clamp Voltage lo
V(NINV)= 0V, I(D1)< I(DREF)
V(NINV)= 0V, I(D1)> I(DREF)
Vc()hi= V(NINV)-VCC; I()= 3mA
I()= -3mA
80
20
0.4
1.5
-1.5
-0.4
V
Bias, Temperature and Supply Monitor
701 Toff
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Turn-on Threshold VCC
127
5
138
9
150
12
C
C
702 Thys
703 VCCon
704 VCCoff
Thys= Toff-Ton
3.6
3.4
40
3.9
3.8
100
4.4
4.3
250
V
Undervoltage Threshold at VCC decreasing Supply VCC
V
705 VCChys Hysteresis
VCChys= VCCon-VCCoff
I()= 1.6mA
mV
706 Vs(NER) Saturation Voltage lo at NER
-25
27
85
0.4
0.4
0.4
0.5
V
V
V
V
0.3
125
707 Isc(NER) Short-Circuit Current lo in NER
V()= 2V..VCC
8
mA
mA
27
27
5
708 I0(NER) Collector Off-State Current
in NER
NER: off, V()= 25V
10
µA
µA
0.1
iC-OV
5-BIT OPTO ENCODER
Rev C0, Page 7/9
DESCRIPTION OF FUNCTIONS
LED Current Control
The integrated LED current control with driver stage keeps the photoelectric current of the reference photodiode
DREF constant. This compensates for ageing, dirt and the decline in LED efficiency as the temperature rises.
Fig. 1: LED Current Control and Monitor
The photoelectric current of the reference DREF and the dark current of compensation diode DDC are amplified
in the current control. The amplified currents are subtracted from one another, yielding the actual value for the
driver’s negative input to trigger the LED.
At the same time, resistor RSET at the pin ISET sets the setpoint for the positive input of the driver - the voltage
at pin ISET is kept at a constant approx. 1.22V.
If there is an optical feedback loop from the LED to reference photodiode DREF, the driver changes the current
through the LED until the actual value at the negative input corresponds to the setpoint at the positive input.
The photoelectric current through the reference DREF and, therefore, the illuminance for the system as a whole
are kept constant. A monitor circuit detects the violation of the control range and indicates this via the fault
message circuit (block: Error).
The series resistor RLED connected in series to the LED limits the current through the diode and establishes the
operating limit of the control.
The optical feedback between LED and reference photodiode should suffice to yield an LED current of less than
8mA at room temperature. The power driver then also possesses sufficient current reserve to correct the
dropping efficiency of the LED at high temperatures.
iC-OV
5-BIT OPTO ENCODER
Rev C0, Page 8/9
Tracks 1..5
The threshold IS of the current comparators for tracks C1 to C5 is determined by the resistor RSET and is about
0.5 x ISET. The threshold is supplemented by the amplified current of compensation diode DDC to compensate
for the dark currents of photodiodes D1 to D5 and the amplifier input currents. The hysteresis of the current
comparators enhances the interference immunity.
Track 1 can be inverted by connecting pin NINV to ground (GND). If the pin remains open, the internal pull-up
current source generates a high level. When the Gray Code is used, inverting the MSB track is the equivalent to
reversing the movement.
Fault message in case of overtemperature or undervoltage
When the chip temperature is too high or the voltage too low, the push-pull output stages are switched to a
high-impedance state and the error state is signalled to the message circuit (block: Error). Both monitoring
circuits operate with hysteresis; NER= low remains until the cause of the error has been eliminated.
Violating the limits of the LED current control range also generates a low signal at the open collector output NER.
APPLICATIONS INFORMATION
Wiring the Test Aid
To activate the test aid integrated into the iC-OV, the current threshold defined in the Electrical Characteristics
No. 403 must be exceeded at both pins TREF and TNRF. This activates the testing aid which does not switch
back off until the current drops below approx. 1µA.
A clamping circuit as per Fig. 2 also prevents a brief drop below the cut-off threshold. A changeover switch can
be used to reverse the output polarity of the iC-OV.
Fig. 2: Wiring the testing aid
iC-OV
5-BIT OPTO ENCODER
Rev C0, Page 9/9
ORDERING INFORMATION
Type
Package
Order designation
iC-OV Chip
iC-OV
iC-OV
BLCC OVC3 iC-OV BLCC OVC3
For information about prices, terms of delivery, options for other case types, etc., please contact:
iC-Haus GmbH
Tel (+49)6135-9292-0
Fax (+49)6135-9292-192
http://www.ichaus.com
Am Kuemmerling 18
D-55294 Bodenheim
GERMANY
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.
相关型号：
©2020 ICPDF网 联系我们和版权申明