preliminary iC-LTA 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 1/13 FEATURES APPLICATIONS ♦ ♦ ♦ ♦ ♦ ♦ Incremental encoder ♦ Brushless DC motor commutation ♦ Industrial drives ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ 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 interpolated Analog signals for alignment and resolution enhancement Selectable index gating: 1 T, 0.5 T (B-gated), 0.25 T (AB-gated) Complementary outputs: A, B, Z and NA, NB, NZ High output frequency for speedy drives and high resolution U, V, W commutation signals, analog and digital 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 °C to +110 °C (+120 °C) Space saving optoQFN / optoBGA packages (RoHS compliant) Custom made code disc and reticle designs 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 LED POWER CONTROL SIGNAL COMPARATION AND QUADRATURE OUTPUT LED PA NA PB D1 R1 47 NB PZ PZ NZ VCC NZ INDEX OUTPUT T1 POWER-ON RESET U U + V V W COMMUTATION CA W GND Copyright © 2010, 2013 iC-Haus http://www.ichaus.com iC-LTA preliminary 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 2/13 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. 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 the A/B track 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. 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 B1, Page 3/13 PACKAGING INFORMATION PAD LAYOUT Chip size 2.88 mm x 3.37 mm PAD FUNCTIONS No. Name Function See pin configuration. MAX. WINDOW 1.900x3.120 1.108x0.238 U 1.064x0.248 0.800x0.330 (4x) V 1.720x0.1503 (2x) W PA 0.4349 0.4401 PB NA NB PZ NZ 0.9200 2.8800 (*): VS. CENTER OF CHIP 0.5050 0.4500 0.4799 0.3797 3.3700 1.156x0.228 1.3550 (*) OUTSIDE TRACK "RA" preliminary iC-LTA 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 4/13 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 B1, Page 5/13 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 18 19 20 21 22 23 PA NA PB NB PZ NZ n.c.2) SEL W TIN V TIP U T1 24 GND 25..32 n.c. BP +3.5..5.5 V Supply Voltage LED Controller, High-Side Current Source Output Push-Pull Output A+ / Analog Sin+ 1) Push-Pull Output A- / Analog SinPush-Pull Output B+ / Analog Cos+ Push-Pull Output B- / Analog CosPush-Pull Output Z+ / Analog Z+ Push-Pull Output Z- / Analog ZOp. Mode Selection Input: lo = digital hi = x2 interpolated open = analog (alignment aid) Push-Pull Output W / Analog W Negative Test Current Input 3) Push-Pull Output V / Analog V Positive Test Current Input 3) Push-Pull Output U / Analog U Index Length Selection Input: lo = 0.5 T (B-gated), hi = 1 T (ungated/T-gated), open = 0.25 T (A and B-gated) Ground Backside Paddle 4) 1) Capacitive pin loads must be avoided when using the analog output signals. 2) Pin numbers marked n.c. are not in use. 3) The test pins TIP and TIN may remain unconnected. 4) The backside paddle may have a single link to GND. A current flow across the paddle is not permissible. preliminary iC-LTA 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 6/13 PACKAGE DIMENSIONS oQFN32-5x5 All dimensions given in mm. Maximum molding excess +20 µm / -75 µm versus surface of glass/reticle. Maximum package thickness tolerance +/- 0.1 mm. RECOMMENDED PCB-FOOTPRINT 15 R0. 0.50 0.30 4.90 0.70 0.90 3.60 SIDE BOTTOM TOP 5 1.90 0.50 0.23 0.40 5 3.60 3.60 3.24 0.30 4.90 3.60 dra_lta-oqfn32-2_pack_1, 10:1 preliminary iC-LTA 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 7/13 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 Range -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 package oQFN32-5x5, oBGA LSH2C -40 110 °C T02 Ts Permissible Storage Temperature Range package oQFN32-5x5, oBGA LSH2C -40 110 °C T03 Tpk Soldering Peak Temperature package oBGA LSH2C; tpk < 20 s, convection reflow tpk < 20 s, vapor phase soldering 245 230 °C °C 245 230 °C °C TOL (time on label) 8 h; Please refer to customer information file No. 7 for details. T04 Tpk Soldering Peak Temperature package oQFN32-5x5; 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 B1, Page 8/13 ELECTRICAL CHARACTERISTICS Operating conditions: 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 op. range 3.5 5.5 V 10 mA 003 Vc()lo Clamp-Voltage lo at all pins I() = -4 mA versus GND -1.2 -0.3 V 004 Vc()hi Clamp-Voltage hi at all pins I() = 4 mA 005 Vc()hi 11 V Clamp-Voltage hi at LED, PA, NA, I() = 4 mA, versus VCC PB, NB, PZ, NZ, U, V, W 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 Photosensors 101 λar Spectral Application Range 102 103 λpk Peak Sensitivity Wavelength Aph() Radiant Sensitive Area 104 S(λr) 106 E()mxpk 680 nm PA, PB, NA, NB PZ, NZ U, V, W 0.264 0.258 0.264 mm2 mm2 mm2 Spectral Sensitivity λLED = 740 nm λLED = 850 nm 0.5 0.3 A/W A/W Permissible Irradiance 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 2.5 400 500 mV kHz Analog Outputs 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 Isc()hi Short-Circuit Current hi SEL open, load current to ground 100 1800 3000 µA 305 Isc()lo Short-Circuit Current lo SEL open, load current to IC 20 40 200 µA 306 Ri() Internal Output Resistance f = 1 kHz 250 750 2250 Ω 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 Comparators 401 Vt()hi 402 Vt()lo Lower Comparator Threshold Iph()p x Z()p < Iph()n x Z()n, resp. Iph()p x Z()p < internal VREF -25 -12 -5 mV 403 Vt()hys Comparator Hysteresis Vt()hys = Vt()hi - Vt()lo 10 24 50 mV preliminary iC-LTA 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 9/13 ELECTRICAL CHARACTERISTICS Operating conditions: 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. LED Power Control 501 Iop() Permissible LED Output Current 502 Vs()hi Saturation Voltage hi Vs()hi = VCC - V(LED), I() = -40 mA 0.25 -40 503 Isc()hi Short-Circuit Current hi V() = 0 V -150 0 0.5 mA 1 V -50 mA Digital Output Drivers PA, NA, PB, NB, PZ, NZ, U, V, W 601 fout Maximum Output Frequency 602 Vs()lo Saturation Voltage lo VCC = 4.5...5.5 V, I() = 4mA, Tj = 70 °C 0.4 V 603 Vs()lo Saturation Voltage lo VCC = 4.5...5.5 V, I() = 4mA, Tj = 85 °C 0.5 V 604 Vs()lo Saturation Voltage lo VCC = 3.5...4.5 V, I() = 4mA 0.6 V 605 606 Isc()lo Short-Circuit Current lo V() = VCC 70 mA Vs()hi Saturation Voltage hi Vs()hi = VCC - V(), I() = -4 mA; VCC = 4.5...5.5 V VCC = 3.5...4.5 V 0.4 0.6 V V -7 mA 607 Isc()hi Short-Circuit Current hi 800 kHz 7 V() = 0 V -70 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 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 10 600 µA 1.25 1.5 1.75 V test mode not active, V() = 0.4 V 60 100 160 µA V() = VCC 0.7 2 3 mA 80 130 190 µA 1599 3000 5000 2.6 3.45 Power-On-Reset Circuit 901 VCCon Turn-on Threshold VCC (power-on release) increasing voltage at VCC V 902 VCCoff Turn-off Threshold VCC (power-down reset) decreasing voltage at VCC 1.4 2.4 903 VCChys Threshold Hysteresis VCChys = VCCon - VCCoff 50 170 300 mV V Index Length Selection Input T1 A01 Vt1()hi Upper Threshold Voltage hi for index length 1 T 78 80 82 %VCC A02 Vt1()lo Upper Threshold Voltage lo for index length 1 T 68 70 72 %VCC A03 Vt1()hys Upper Threshold Hysteresis Vt1()hys = Vt1()hi - Vt1()lo 8 10 12 %VCC A04 Vt2()hi Lower Threshold Voltage hi for index length 0.5 T (B-gated) 28 30 32 %VCC A05 Vt2()lo Lower Threshold Voltage lo for index length 0.5 T (B-gated) 18 20 22 %VCC A06 Vt2()hys Lower Threshold Hysteresis Vt2()hys = Vt2()hi - Vt2()lo 8 10 12 %VCC A07 V0() Pin-Open Voltage for index length 0.25 T (AB-gated) 45 50 55 %VCC A08 Rpu() Pull-Up Resistor VCC to T1, V(T1) = 0 V 70 100 140 kΩ A09 Rpd() Pull-Down Resistor T1 to GND, V(T1) = VCC 70 100 140 kΩ A10 Vpd() Pull-Down Voltage vs. VCC/2 Vpd() = V() - VCC/2; I() = 0...5 µA 0.5 V A11 Vpu() Pull-Up Voltage vs. VCC/2 Vpu() = V() - VCC/2; I() = -5...0 µA -0.5 V preliminary iC-LTA 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 10/13 DIGITAL OUTPUT SIGNALS T iC-LTA’s photo-sensor array requires an external reticle (placed either on side of the IC or on side of the LED), and thus allows for a free definition of the optical radius and cycles per revolution for the A and B encoder quadrature signals. PA PB AB-gated PZ B-gated T/4 T/4 T/4 ungated T/4 The pulse count, period length and phase shift for the U, V, W commutation signals is also determined by the code disc design. ö C U Contracted code disc designs and IC packaging with custom reticle can be offered on request; contact iCHaus for details. V W C/6 C/6 C/6 C/6 C/6 C/6 Figure 1: Typical encoder quadrature and motor commutation signals. ANALOG OUTPUT SIGNALS GND CA T1 When the operating mode selection input SEL is left open, all digital outputs are disabled and analog output signals are available for test and alignment. PA PB PZ VCC If analog signals are desired permanently, noise immunity can be improved by wiring pin SEL to an external VCC/2 reference. U SEL Figure 2: Analog signal output (pin SEL open). INDEX GATING VCC T GND CA T1 PA PB PZ T/4 T/4 T/4 T/4 SEL Figure 3: Ungated index signal (T1 = high) at x1 interpolation (SEL = low). preliminary iC-LTA 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 11/13 VCC T GND CA T1 PA PB PZ VCC T/4 T/4 T/4 T/4 SEL Figure 4: T-gated index signal (T1 = high) at x2 interpolation (SEL = high). T GND CA T1 PA PB PZ T/4 T/4 T/4 T/4 SEL Figure 5: B-gated index signal (T1 = low) at x1 interpolation (SEL = low). T GND CA T1 PA PB PZ VCC T/4 T/4 T/4 T/4 SEL Figure 6: B-gated index signal (T1 = low) at x2 interpolation (SEL = high). T GND CA T1 pin open PA PB PZ T/4 T/4 T/4 T/4 SEL Figure 7: AB-gated index signal (T1 = open or VCC/2) at x1 interpolation (SEL = low). preliminary iC-LTA 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 12/13 T GND CA T1 pin open PA PB PZ VCC T/4 T/4 T/4 T/4 SEL Figure 8: AB-gated index signal (T1 = open or VCC/2) at x2 interpolation (SEL = high). APPLICATION CIRCUITS Please refer to iC-PTxx series IC’s application notes which are available separately. DESIGN REVIEW: Notes on Chip Functions iC-LTA_Y No. Function, Parameter/Code Description and Application Hints 1 Index gating 1/4 T Package oBGA LSH2C: Index length preset to 1/4 T (AB-gated). (Package oQFN32-5x5 is not available.) Table 4: Chip release iC-LTA_Y iC-LTA_X No. Function, Parameter/Code Description and Application Hints 1 Index length selection input T1 Package oBGA LSH2C: Index length preset to 1/4 T (AB-gated). Package oQFN32-5x5: Index length selection input T1 available on pin no. 23. Table 5: Chip release iC-LTA_X 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. preliminary iC-LTA 6-CH. INCREMENTAL OPTO ENCODER ARRAY Rev B1, Page 13/13 ORDERING INFORMATION Type Package Options Order Designation iC-LTA 15-pin optoBGA, 6.2 mm x 5.2 mm, thickness 1.7 mm AB-gated index, glass lid iC-LTA oBGA LSH2C AB-gated index, on-chip reticle iC-LTA oBGA LSH2C-xR selectable index gating, glass lid iC-LTA oQFN32-5x5 selectable index gating, on-chip reticle iC-LTA oQFN32-5x5-xR iC-LTA 32-pin optoQFN, 5 mm x 5 mm, thickness 0.9 mm 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