ICHAUS IC-LTA

preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 1/14
FEATURES
APPLICATIONS
♦
♦
♦
♦
♦
♦ Incremental encoder
♦ Brushless motor commutation
♦
♦
♦
♦
♦
♦
♦
♦
♦
Monolithic photodiode array with excellent signal matching
Very compact size for small encoders
Moderate track pitch for relaxed assembly tolerances
Low noise signal amplifiers with high EMI tolerance
Single-pin programming of 3 operating modes:
analog, digital, and x2 interpolation
A-AND-B gated Z index signal
Complementary outputs: A, B, Z and NA, NB, NZ
U, V, W commutation signals (digital/analog)
All outputs +/- 4 mA push-pull, current-limited and
short-circuit-proof
LED power control with 40 mA high-side driver
Single 3.5 V to 5.5 V operation, low power consumption
Operating temperature range of -40 to +85 °C
(optional -40 to +120 °C)
Space saving optoQFN and optoBGA packages
(RoHS compliant)
Custom made code discs on request
PACKAGES
32-pin optoQFN
5 mm x 5 mm x 0.9 mm
15-pin optoBGA
6.2 mm x 5.2 mm x 1.7 mm
BLOCK DIAGRAM
+3.5..5.5V
C1
1μF
iC-LTA
TIP
TIN
SEL
PA
NA
PB
NB
VCC
LED
POWER
CONTROL
SIGNAL
COMPARATION
AND
QUADRATURE
OUTPUT
PA
NA
PB
D1
R1
47
NB
PZ
PZ
NZ
LED
NZ
INDEX
OUTPUT
POWER-ON RESET
U
U
+
V
V
W
W
COMMUTATION
GND
Copyright © 2011 iC-Haus
http://www.ichaus.com
iC-LTA
preliminary
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 2/14
DESCRIPTION
iC-LTA is a versatile optical sensor IC with integrated
photosensors whose signals are converted into voltages by low-noise transimpedance amplifiers. Precise voltage comparators with hysteresis are used to
generate the digital signals, supplied to the output
pins via differential +/- 4 mA push-pull drivers.
The built-in LED power control with its 40 mA driver
stage permits a direct connection of the encoder
LED. Regardless of aging or changes in temperature
the received optical power is kept constant. An internal resistor presets the photocurrent operating point
and thus the desired illumination level.
Selection input SEL chooses for three different operating modes: regular A/B operation, A/B operation
with 2-fold interpolation, or analog operation. With
analog operation the amplified signal voltages are
available at the outputs for inspection and monitoring
encoder assembly.
The typical application of iC-LTA are incremental encoders for motor feedback and commutation. To this
end, iC-LTA provides a differential scanning for A/B
and the index track Z. The layout of the signal amplifiers is such that there is an excellent paired channel
matching, eliminating the needs for signal calibration
in most cases.
Additionally, three more tracks are provided to generate motor commutation information for the U, V and
W outputs, for instance with 120 degree phase shift
to operate 3-phase brushless motors (period count
and phase shift can be varied by the code disc applied).
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 3/14
PACKAGES
PAD LAYOUT
Chip size 2.88 mm x 3.37 mm
PAD FUNCTIONS
No. Name Function
See pin configuration.
MAX. WINDOW 1.900x3.120
OUTSIDE TRACK "RA"
1.156x0.228
0.4349
0.800x0.330 (4x)
0.4401
1.720x0.1503 (2x)
0.5050
0.4500
0.4799
0.3797
0.9200
2.8800
(*): VS. CENTER OF CHIP
3.3700
1.064x0.248
1.3550 (*)
1.108x0.238
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 4/14
PIN CONFIGURATION
oBGA LSH2C (6.2 mm x 5.2 mm)
1
A
B
C
D
2
3
PIN FUNCTIONS
No. Name Function
4
A2 VCC
A3 LED
A4
B1
B2
B3
B4
C1
C2
C3
C4
D1
D2
D3
GND
PA
NA
TIP
U
PB
NB
TIN
V
PZ
NZ
SEL
D4 W
+3.5..5.5 V Supply Voltage
LED Controller, High-Side Current
Source Output
Ground
Push-Pull Output A+ (Sin+)
Push-Pull Output A- (Sin-)
Positive Test Current Input
Push-Pull Output U
Push-Pull Output B+ (Cos+)
Push-Pull Output B- (Cos-)
Negative Test Current Input
Push-Pull Output V
Push-Pull Output Z+ (Index+)
Push-Pull Output Z- (Index-)
Op. Mode Selection Input:
lo = digital,
hi = x2 interpolated
open = analog (alignment)
Push-Pull Output W
For dimensional specifications refer to the relevant package data sheet, available separately.
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 5/14
PIN CONFIGURATION
oQFN32-5x5 (5 mm x 5 mm)
PIN FUNCTIONS
No.
Name Function
1 VCC
2 LED
32 31 30 29 28 27 26 25
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
9 10 11 12 13 14 15 16
3
4
5
6
7
8
9..16
17
PA
NA
PB
NB
PZ
NZ
n.c.
SEL
18
19
20
21
22
23
24
25..32
W
TIN
V
TIP
U
n.c.
GND
n.c.
BP
+3.5..5.5 V Supply Voltage
LED Controller, High-Side Current
Source Output
Push-Pull Output A+ (Sin+)
Push-Pull Output A- (Sin-)
Push-Pull Output B+ (Cos+)
Push-Pull Output B- (Cos-)
Push-Pull Output Z+ (Index+)
Push-Pull Output Z- (Index-)
Op. Mode Selection Input:
lo = digital,
hi = x2 interpolated
open = analog (alignment)
Push-Pull Output W
Negative Test Current Input
Push-Pull Output V
Positive Test Current Input
Push-Pull Output U
Ground
Backside Paddle
Pin numbers marked n.c. are not in use. The backside paddle is not intended as an electrical connection point;
when used as shield a single link to GND is permissible. The test pins TIP and TIN may remain unconnected.
Capacitive pin loads must be avoided when using the analog test signals for alignment purposes.
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 6/14
PACKAGE DIMENSIONS oQFN32-5x5
RECOMMENDED PCB-FOOTPRINT
15
R0.
0.30
0.70
0.50
4.90
3.60
SIDE
0.90
0.30
4.90
3.60
BOTTOM
TOP
5
1.90
3.60
0.50
0.23
0.40
5
3.24
3.60
dra_lta-oqfn32-2_pack_1, 10:1
Maximum molding excess +20 µm / -200 µm versus surface of glass.
All dimensions given in mm.
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 7/14
ABSOLUTE MAXIMUM RATINGS
These ratings do not imply operating conditions; functional operation is not guaranteed. Beyond these ratings device damage may occur.
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
Max.
G001 VCC
Voltage at VCC
-0.3
6
V
G002 I(VCC)
Current in VCC
-20
20
mA
G003 V()
Voltage at Output Pins
PA, NA, PB, NB, PZ, NZ, U, V, W#
-0.3
VCC +
0.3
V
G004 I()
Current in Output Pins
PA, NA, PB, NB, PZ, NZ, U, V, W#
-20
20
mA
G005 V()
Voltage at LED
-0.3
VCC +
0.3
V
G006 I()
Current in LED
-120
20
mA
G007 V()
Voltage at TIP, TIN, SEL
-0.3
VCC +
0.3
V
G008 I()
Current in TIP, TIN, SEL
-20
20
mA
G009 Vd()
ESD Susceptibility at all pins
2
kV
G010 Tj
Junction Temperature
-40
150
°C
G011 Ts
Chip Storage Temperature
-40
150
°C
HBM, 100 pF discharged through 1.5 kΩ
THERMAL DATA
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
Typ.
Max.
T01
Ta
Operating Ambient Temperature Range
(extended range on request)
-40
85
°C
T02
Ts
Permissible Storage Temperature
Range
-40
85
°C
T03
Tpk
Soldering Peak Temperature
245
230
°C
°C
tpk < 20 s, convection reflow
tpk < 20 s, vapor phase soldering
MSL 5A (max. floor live 24 h at 30 °C and
60 % RH);
Please refer to customer information file No. 7
for details.
All voltages are referenced to ground unless otherwise stated.
All currents flowing into the device pins are positive; all currents flowing out of the device pins are negative.
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 8/14
ELECTRICAL CHARACTERISTICS
VCC = 3.5...5.5 V, Tj = -40...125 °C, λLED = λr = 740 nm, unless otherwise noted
Item
No.
Symbol
Parameter
Conditions
Unit
Min.
Typ.
Max.
Total Device
001
VCC
Permissible Supply Voltage
002
I(VCC)
Supply Current in VCC
no load, photocurrents within linear op. range
(no override)
3.5
5.5
V
10
mA
003
Vc()lo
Clamp-Voltage lo at all pins
I() = -4 mA versus GND
004
Vc()hi
Clamp-Voltage hi at all pins
I() = 4 mA
-0.3
V
11
005
Vc()hi
Clamp-Voltage hi at LED, PA, NA, I() = 4 mA, versus VCC
PB, NB, PZ, NZ, U, V, W
V
0.3
1.2
V
006
Vc()hi
Clamp-Voltage hi at
SEL, TIP, TIN
I() = 4 mA, versus VCC
0.7
2.2
V
Se(λar) = 0.25 x S(λ)max
400
950
nm
3
-1.2
Photosensors
101
λar
Spectral Application Range
102
103
λpk
Peak Sensitivity Wavelength
Aph()
Radiant Sensitive Area
PA, PB, NA, NB
PZ, NZ
U, V, W
104
S(λr)
Spectral Sensitivity
105
106
S(λ)max
Max. Spectral Sensitivity
E()mxpk
Permissible Irradiance
680
nm
0.264
0.258
0.264
mm2
mm2
mm2
λLED = 740 nm
0.5
A/W
λLED = λpk
0.55
A/W
λLED = λpk, Vout() < Vout()mx;
PA, PB, NA, NB
0.55
U, V, W
0.4
PZ, NZ
0.45
mW/
cm2
mW/
cm2
mW/
cm2
Photocurrent Amplifiers
201
Iph()
Permissible Photocurrent
Operating Range
0
202
η()r
Photo Sensitivity
for PA, PB, NA, NB
(light-to-voltage conversion ratio) for PZ, NZ, U, V, W
0.1
0.2
203
Z()
Equivalent Transimpedance Gain Z = Vout() / Iph(), Tj = 27 °C;
for PA, PB, NA, NB
for PZ, NZ, U, V, W
0.56
0.66
550
nA
0.3
0.4
0.5
0.6
V/µW
V/µW
0.75
1.0
1
1.36
MΩ
MΩ
204
TCZ
Temperature Coefficient Of
Transimpedance Gain
-0.12
205
∆Z()pn
Transimpedance Gain Matching
SEL open, P vs. N path per diff. channel
-0.2
0.2
%
206
∆Vout()
Dark Signal Matching
of A, B
SEL open, output vs. output
-8
8
mV
207
∆Vout()
Dark Signal Matching
of U, V, W
SEL open, output vs. output
-12
12
mV
208
∆Vout()
Dark Signal Matching
of A, B, Z, U, V, W
SEL open, any output vs. any output
-24
24
mV
209
∆Vout()pn Dark Signal Matching
SEL open, P vs. N path per diff. channel
-2.5
211
fc()hi
Cut-off Frequency (-3 dB)
%/°C
2.5
400
mV
kHz
Analog Test Signals PA, NA, PB, NB, PZ, NZ, U, V, W
301
Vout()mx
Maximum Output Voltage
illumination to E()mxpk
1.04
1.27
1.8
V
302
Vout()d
Dark Signal Level
Load 100 kΩ vs. +2 V
640
770
985
mV
303
Vout()acmx Maximum Signal Level
Vout()acmx = Vout()mx - Vout()d
0.3
0.5
0.75
V
304
Imx()hi
Output Current Limitation hi
SEL open, load current to ground
100
1800
3000
µA
305
Imx()lo
Output Current Limitation lo
SEL open, load current to IC
20
40
200
µA
306
Ri()
Internal Output Resistance
f = 1 kHz
250
750
2250
Ω
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 9/14
ELECTRICAL CHARACTERISTICS
VCC = 3.5...5.5 V, Tj = -40...125 °C, λLED = λr = 740 nm, unless otherwise noted
Item
No.
Symbol
Comparators
401 Vt()hi
Parameter
Conditions
Unit
Min.
Typ.
Max.
Upper Comparator Threshold
Iph()p x Z()p > Iph()n x Z()n,
resp. Iph()p x Z()p > internal VREF
5
12
25
mV
402
Vt()lo
Lower Comparator Threshold
Iph()p x Z()p < Iph()n x Z()n,
resp. Iph()p x Z()p < internal VREF
5
12
25
mV
403
Vt()hys
Comparator Hysteresis
Vt()hys = Vt()hi - Vt()lo
10
24
50
mV
0
mA
LED Power Control
501
Imx()
Permissible LED Output Current
502
Vs()hi
Saturation Voltage hi
Vs()hi = VCC - V(), I() = -40 mA
0.25
-40
503
Isc()hi
Short-Circuit Current hi
V() = 0 V
-150
0.5
1
V
-50
mA
Digital Output Drivers PA, NA, PB, NB, PZ, NZ, U, V, W
601
Vs()lo
Saturation Voltage lo
VCC = 4.5...5.5 V, I() = 4mA, Tj = 70 °C
0.4
V
602
Vs()lo
Saturation Voltage lo
VCC = 4.5...5.5 V, I() = 4mA, Tj = 85 °C
0.5
V
603
Vs()lo
Saturation Voltage lo
VCC = 3.5...4.5 V, I() = 4mA
0.6
V
604
Isc()lo
Short-Circuit Current lo
V() = VCC
70
mA
605
Vs()hi
Saturation Voltage hi
Vs() = VCC - V(), VCC = 4.5...5.5 V, I() = -4 mA
0.4
V
606
Vs()hi
Saturation Voltage hi
Vs() = VCC - V(), VCC = 3.5...4.5 V, I() = -4 mA
0.6
V
607
Isc()hi
Short-Circuit Current hi
V() = 0 V
-70
-7
mA
7
Selection Input SEL
701
Vt1()hi
Upper Threshold Voltage hi
for A/B mode with x2 interpolation
78
80
82
%VCC
702
Vt1()lo
Upper Threshold Voltage lo
for A/B mode with x2 interpolation
68
70
72
%VCC
703
Vt1()hys
Upper Threshold Hysteresis
Vt1()hys = Vt1()hi - Vt1()lo
8
10
12
%VCC
704
Vt2()hi
Lower Threshold Voltage hi
for A/B mode
28
30
32
%VCC
705
Vt2()lo
Lower Threshold Voltage lo
for A/B mode
18
20
22
%VCC
706
Vt2()hys
Lower Threshold Hysteresis
Vt2()hys = Vt2()hi - Vt2()lo
8
10
12
%VCC
707
V0()
Pin-Open Voltage
for analog mode
45
50
55
%VCC
708
Rpd()
Pull-Down Resistor
SEL to GND, V(SEL) = VCC
70
100
140
kΩ
709
Rpu()
Pull-Up Resistor
VCC to SEL, V(SEL) = 0 V
70
100
140
kΩ
710
Vpd()
Pull-Down Voltage vs. VCC/2
Vpd() = V() - VCC/2; I() = 0...5 µA
0.5
V
711
Vpu()
Pull-Up Voltage vs. VCC/2
Vpu() = V() - VCC/2; I() = -5...0 µA
-0.5
V
Test Circuit Inputs TIP, TIN
801
I()test
Permissible Test Current Range
test mode active
802
V()test
Test Pin Voltage
test mode active, I() = 200 µA
600
µA
1.25
803
Ipd()
Test Pin Pull-Down Current
804
Ipd()
Test Pin Pull-Down Current
805
It()on
Test Mode Activation Threshold
806
CR()
Test Mode Current Ratio I()/Iph() test mode active, I() = 200 µA
10
1.5
1.75
V
test mode not active, V() = 0.4 V
60
100
160
µA
V() = VCC
0.7
2
3
mA
µA
80
130
190
1599
3000
5000
2.6
3.45
Power-On-Reset Circuit
901
VCCon
Turn-on Threshold VCC
(power-on release)
increasing voltage at VCC
902
VCCoff
Turn-off Threshold VCC
(power-down reset)
decreasing voltage at VCC
1.4
2.4
903
VCChys
Threshold Hysteresis
VCChys = VCCon - VCCoff
50
170
V
V
300
mV
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 10/14
Z INDEX SIGNAL
T
PA
PB
PZ
T/4
T/4
T/4
T/4
SEL
Figure 1: A-AND-B gated Z index signal at x1 interpolation (SEL = lo)
T
PA
PB
PZ
VCC
T/4 T/4 T/4 T/4
SEL
Figure 2: A-AND-B gated Z index signal at x2 interpolation (SEL = hi)
iC-LTA
preliminary
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 11/14
APPLICATION CIRCUITS
iC-LTA
iC-HD2
Disc
iC-HD2
Figure 3: Circuit example of an incremental/commutation encoder with RS422 line drivers for 5 V applications.
iC-LTA
preliminary
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 12/14
iC-LTA
iC-HD2
Disc
iC-HD2
Figure 4: Circuit example of an incremental/commutation encoder with differential line drivers for a supply
voltage range of 10 V to 30 V.
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 13/14
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Figure 5: Circuit example of an incremental encoder for 24 V applications and long cables (supply voltage
range of 10 V to 30 V, cable length of up to 100 m).
iC-Haus expressly reserves the right to change its products and/or specifications. An info letter gives details as to any amendments and additions made to the
relevant current specifications on our internet website www.ichaus.de/infoletter; this letter is generated automatically and shall be sent to registered users by
email.
Copying – even as an excerpt – is only permitted with iC-Haus’ approval in writing and precise reference to source.
iC-Haus does not warrant the accuracy, completeness or timeliness of the specification and does not assume liability for any errors or omissions in these
materials.
The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of merchantability, fitness
for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which information refers and no
guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or areas of applications of
the product.
iC-Haus conveys no patent, copyright, mask work right or other trade mark right to this product. iC-Haus assumes no liability for any patent and/or other trade
mark rights of a third party resulting from processing or handling of the product and/or any other use of the product.
As a general rule our developments, IPs, principle circuitry and range of Integrated Circuits are suitable and specifically designed for appropriate use in technical
applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. In principle the range of
use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued
annually by the Bureau of Statistics in Wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in
Hanover (Hannover-Messe).
We understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations
of patent law. Our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can
be put to.
preliminary
iC-LTA
6-CH. INCREMENTAL OPTO ENCODER ARRAY
Rev A4, Page 14/14
ORDERING INFORMATION
Type
Package
iC-LTA
-
Options
Order Designation
iC-LTA chip
32-pin optoQFN,
5 mm x 5 mm,
thickness 0.9 mm
glass lid
iC-LTA oQFN32-5x5
15-pin optoBGA,
6.2 mm x 5.2 mm,
thickness 1.6 mm
glass lid
iC-LTA oBGA LSH2C
15-pin optoBGA,
6.2 mm x 5.2 mm,
thickness 1.7 mm
on-chip reticle
iC-LTA oBGA LSH2C-xR
For technical support, information about prices and terms of delivery please contact:
iC-Haus GmbH
Am Kuemmerling 18
D-55294 Bodenheim
GERMANY
Tel.: +49 (61 35) 92 92-0
Fax: +49 (61 35) 92 92-192
Web: http://www.ichaus.com
E-Mail: [email protected]
Appointed local distributors: http://www.ichaus.com/sales_partners