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 # 5 1 5 01 1 1 0 ! 070 68$'57$3465' 51 1 46 5 6 61 1 64 4 84 8 68 6 7 70 75 865 $84 & 45468 480 2340546357 3636 5 1 1 4 84 6875 & 07 755 '64$7 6 360 8 8 7 8 807% 3636 57 5775787 0 $80 71 41 4 4 4 9 481 9 89 +,- 755 5'07676 8 4 7555 875 ' 64$7 57$'4 65 89 9 ! 1" 70 675&4 360 8 57$' 1" 7 48 758'57 76 7 3 3 * & & 36468 48 7 $80 1" $80 1 0() 6875 & 07 070 6 8755 5 '64$7 6 360 8 8 570 755 0 ! 65 7555 7 71 41 84 4 8 4 89 481 7 48 7 48 7 $80 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