IC-OGCHIP

iC-OG 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER Rev C1, Page 1/9 FEATURES Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Monolithic construction with integrated photodiodes ensures excellent matching and technical reliability Short track spacing of 600 µm Elimination of dark currents through differential scanning Photocurrent amplifier with high cut-off frequency Comparators with precise signal-related hysteresis Current-limited push-pull outputs Adjustable LED current control for constant received power Integrated power driver for the LED LED current monitor with error message output Integrated test aid Low power consumption from 5V supply voltage Available as a 20-pin BLCC or as chip Options: extended temperature range of -40..110 °C, customized packages, reticle assembly APPLICATIONS Ë Ë Optical position decoding using the principle of differential scanning Incremental and absolute encoder with a resolution of up to 8 bits CHIP 3.05mm × 5.1mm BLOCK DIAGRAM 5V +/- 10% 20 C1 100nF 7 R1 27kΩ C2 100nF 6 1 ISET AGND VCC VCC 12 : 1 1.2V LED 5 R2 30Ω D1 LED R3 10kΩ LED-CURRENT CONTROL DDC AMPLIFIER MONITOR NER 10 ERROR CSR AMPLIFIER COMPARATOR IP IN PUSH-PULL OUTPUT S0 NI0 19 2 18 3 17 4 DP0 DN0 ANALOG OUTPUT TRACK 0 S1 DP1 DP2 DN1 DN2 AMPLIFIER (see TRACK 0) TRACK 1 TRACK 2 PUSH-PULL OUTPUT NI1 S2 (see TRACK 0) NI2 COMPARATOR S3 16 DP3 DN3 TRACK 3 S4 15 DP4 DP5 DP6 DP7 9 8 TIP DN4 DN5 DN6 DN7 (see TRACK 3) TRACK 4 S5 14 (see TRACK 3) TRACK 5 S6 13 (see TRACK 3) TRACK 6 S7 12 (see TRACK 3) TRACK 7 c2 1 TEST TIN BIAS c2 1 iC-OG BLCC OGC 1.2V GND 11 Copyright © 1999, 2010, iC-Haus www.ichaus.com iC-OG 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER Rev C1, Page 2/9 DESCRIPTION The iC-OG device is an optoelectronic detector IC for linear and angle measuring systems, such as glass scales or shaft encoders, for example. Photodiodes, amplifiers, comparators and TTL-compatible push-pull output drivers are integrated monolithically. Each of the 8 tracks is evaluated differentially; there are also analog outputs available from three of the special feature tracks. The integrated LED current control with a driver stage enables a transmit diode with series resistor to be directly connected and ensures a constant optical received power. The setpoint for the receive current is adjusted using an external resistor. Should the LED current control deviate from its working range, this is reported at the error message output. Two test pins allow a full test of all functions to be carried out excluding the photodiodes. All push-pull and analog outputs are protected against ESD and short-circuit damage. The error message output NER is also protected against short-circuiting and can be used in bus systems due to its open-collector output. iC-OG 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER Rev C1, Page 3/9 CHIP LAYOUT Dimensions in µm; chip size 3.05 mm × 5.1 mm PAD DESCRIPTION Name CSR NI0 NI1 NI2 LED AGND ISET TIN TIP NER GND S7 .. S0 VCC Function External capacitor for LED control Track 0 Analog Push-Pull Output Track 1 Analog Push-Pull Output Track 2 Analog Push-Pull Output LED Driver Output Reference Ground for ISET and CSR circuitry LED Current Control Setup Negative Test Aid Input Positive Test Aid Input Error Message Output, low active Ground Track 7 Push-Pull Output .. Track 0 Push-Pull Output +5V Supply Voltage iC-OG 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER Rev C1, Page 4/9 ABSOLUTE MAXIMUM RATINGS Values beyond which damage may occur; device operation is not guaranteed. Item Symbol Parameter Supply Voltage Voltage at Outputs S0..7 Current in Outputs S0..7 Voltage at Analog Outputs NI0..2 Current in Analog Outputs NI0..2 Current in TIP, TIN Current in ISET Current in AGND Current in LED Current in LED Voltage at CSR Current in CSR Voltage at NER ESD Susceptibility Junction Temperature Storage Temperature see package specification HBM, 100 pF discharged through 1.5 kΩ -40 V(LED)< 0 or V(LED)> VCC 0< V(LED) < VCC V(S)< 0V or V(S)> VCC Conditions Fig. Min. G001 VCC G301 V(S) G302 I(S) G501 V(NI) G502 I(NI) G601 I(TIP) I(TIN) G701 I(ISET) G702 I(AGND) G703 I(LED) G704 I(LED) G705 V(CSR) G706 I(CSR) GA01 V(NER) E001 Vd() TG1 Tj TG2 Ts -0.3 -0.3 -3 -0.3 -3 -1 -1 -5 -3 0 -0.3 -3 -0.3 Max. 6 VCC+0.3 3 VCC+0.3 3 1 0.1 5 3 150 VCC+0.3 3 6 2 125 V V mA V mA mA mA mA mA mA V mA V kV °C Unit THERMAL DATA Operating Conditions: VCC= 5V ±10% Item T1 Symbol Ta Parameter Operating Ambient Temperature Range Conditions see package specification Fig. Min. Typ. Max. 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-OG 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER Rev C1, Page 5/9 ELECTRICAL CHARACTERISTICS Operating Conditions: VCC= 5V ±10%, Tj= -40..125 °C, unless otherwise noted. Item Symbol Parameter Conditions Tj EC Total Device 001 002 VCC I(VCC) Permissible Supply Voltage Range Supply Current in VCC, Outputs S0..7 hi LED control active: R(ISET/AGND)= 140kΩ, I(LED). 8mA, NER=hi; I(DP0..7)= 30nA, I(DN0..7)= 3nA, I(S0..7)= 0; LED control active: R(ISET/AGND)= 14kΩ, I(LED). 80mA, NER=hi; I(DP0..7)= 3nA, I(DN0..7)= 30nA, I(S0..7)= 0; sinusoidal waveform, I(DP0..7)= 3..30nA I(DN0..7)= 30..3nA see No. 4 sinusoidal waveform, I(DP0..7)= 6..60nA I(DN0..7)= 60..6nA see No. 6 0.2 × 0.3 λ= 850nm S(λar)= 0.1×S(λ)max 500 0.85 I(DPi, DNi)= 3..90nA 8 1 11 0.5 1050 90 1.15 17 % 200 100 4.5 10 5.5 V mA Fig. Min. Typ. Max. Unit 003 I(VCC) Supply Current in VCC, Outputs S0..7 lo 10 mA 004 fo Cut-off Frequency, tracks 0..7 Propagation Delay Cut-off Frequency, tracks 0..7 Propagation Delay kHz 005 006 tp(D-A) 2.5 µs kHz 007 101 102 103 104 105 201 Aph(D) S(λ)max λar I(D) CM() Hys 1.5 µs mm² A/W nm nA Photodiodes and Amplifiers, tracks 0..7 Radiant Sensitive Area Spectral Sensitivity Range of Spectral Sensitivity Permissible Photocurrent Common Mode DPi to DNi Hysteresis referred to [I(DPi) + I(DNi)] /2 Saturation Voltage hi Saturation Voltage hi Saturation Voltage lo Short-Circuit Current hi Short-Circuit Current lo Slew-Rate hi Slew-Rate lo Clamp Clamp Voltage hi Clamp Clamp Voltage lo Difference Comparators, tracks 0..7 Push-Pull Outputs S0..7 301 302 303 304 305 306 307 308 309 Vs()hi Vs()hi Vs()lo Isc()hi Isc()lo tr() tf() Vc()hi Vc()lo Vs()hi= VCC-V(); I()= -40µA 27 Vs()hi= VCC-V(); I()= -400µA 27 I()= 1.6mA 27 V()= 0V..VCC-1.2V V()= 0.4V..VCC CL()= 30pF 27 CL()= 30pF 27 Vc()hi= V()-VCC; S()= hi, I()= 3mA S()= lo, I()= -3mA 0.4 -1.5 40 115 1.5 -0.4 -7 1.8 24 61 380 0.22 -4.6 7.3 -1.4 13 130 0.83 0.4 0.69 1.05 0.95 V V V V V V mA mA V/µs V/µs V/µs V/µs V V iC-OG 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER Rev C1, Page 6/9 ELECTRICAL CHARACTERISTICS Operating Conditions: VCC= 5V ±10%, Tj= -40..125 °C, unless otherwise noted. Item Symbol Parameter Conditions Tj EC Analog Outputs NI0..2 501 502 503 CR() I0() fo() Current Ratio I(NIi) / (I(DPi)-I(DNi)) Leakage Current Cut-off Frequency V(NIi)= 0.3V..VCC-1.2V, I(DPi)= 3..90nA, I(DNi)= 90..3nA V(NI)= 0.3V..VCC-1.2V, I(DPi,DNi)= 0 V(NIi)= constant, sinussoidal waveform, I(DPi)= 3..30nA, I(DNi)= 30..3nA V(NIi)= constant, sinussoidal waveform, I(DPi)= 6..60nA, I(DNi)= 60..6nA R(VCC/NIi)= 50kΩ, R(NIi/GND)= 50kΩ, CL()= 30pF Vc()hi= V()-VCC; I()= 3mA I()= -3mA Test aid active, I()= 2..200µA V()= 0.4V -40 27 85 125 Test aid active, I(TIP)= 2..200µA and I(TIN)= 100µA, or I(TIP)= 100µA and I(TIN)= 2..200µA ISUM= I(DP0) +I(DN0) +I(DP1) +I(DN1) -40 27 85 125 1.9 1.6 1.2 1.1 0 550 27 -1.5 100 720 1.5 µA kHz 1250 Fig. Min. Typ. Max. Unit 504 fo() Cut-off Frequency 200 kHz 505 fo() Cut-off Frequency 50 80 kHz 506 507 601 Vc()hi Vc()lo CR() Clamp Voltage hi Clamp Voltage lo Current Ratio I(TIP) / I(DPi,DDC) and I(TIN) / I(DNi) Pull-Down Current (Test Aid Turn-on Threshold) 0.4 -1.5 750 1100 1.5 -0.4 1600 V V Test Aid TIP, TIN 602 It() 2.5 14 19 25 28 2.4 2.1 1.8 1.6 125 µA µA µA µA µA V V V V nA 603 V()on Turn-on Voltage 2.7 2.4 2.1 1.9 360 LED Current Control ISET, AGND, LED, CSR 701 ISUM Permissible Sum Current of photodiodes DP0, DN0, DP1, DN1 Permis. Driver Current in LED Saturation Voltage at LED I(LED)= 80mA, I(ISET)> 20µA, V(CSR)= VCC -40 27 85 125 1.15 8 -40 27 85 125 70 0.4 -1.5 12.0 11.9 11.75 11.65 92 130 1.5 -0.4 V V 702 703 I(LED) Vs(LED) 0 0.96 0.88 0.79 0.72 1.22 80 1.35 mA V V V V V V 704 705 V(ISET) CR() Voltage at ISET Current Ratio I(ISET) / I(CSR) R(ISET/AGND)= 10..150kΩ V(CSR)= 0.3V, ISUM= 0, R(ISET)= 10..150kΩ 1.35 15 706 707 708 CR() Vc()hi Vc()lo Current Ratio I(CSR) / ISUM Clamp Voltage hi at ISET, LED, CSR Clamp Voltage lo at ISET, LED, CSR V(CSR)= 1..3V, I(ISET)= 0 Vc()hi= V()-VCC; I()= 3mA VCC= 0V, I()= -3mA iC-OG 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER Rev C1, Page 7/9 ELECTRICAL CHARACTERISTICS Operating Conditions: VCC= 5V ±10%, Tj= -40..125 °C, unless otherwise noted. Item Symbol Parameter Conditions Tj EC Control Monitor NER 801 802 803 Vs() Isc() I0() Saturation Voltage lo Short-Circuit Current lo Collector Off-state Current I(NER)= 3.2mA V(NER)= VCC NER: off, V(NER)= 0..6V 0.27 15 0.4 27 10 V mA µA Fig. Min. Typ. Max. Unit DESCRIPTION OF FUNCTIONS LED current control The integrated LED current control with a driver stage controls the LED in accordance with the sum of the photocurrents from the tracks 0 and 1. Compensation is made for age and dirt, as well as for the reduced efficiency of the LED caused by rises in temperature. Fig. 1: LED Current Control and Monitoring The photodiodes DPO, DNO, DP1 and DN1 act as reference diodes. The sum is output via a current sink to the comparison point pin CSR. Simultaneously, the resistor R1 at pin ISET (the voltage at the ISET pin is kept at a constant of approximately 1.22V) supplies a reference current for the current source from VCC, which also works towards the comparison point pin CSR. The comparison point also receives the amplified current from the compensation diode DDC in order to compensate for dark currents and for the amplifier input currents. If there is an optical feedback from the LED to the reference photodiodes, the voltage at the CSR pin adjusts to satisfy the needs of the power driver for the required transmit current at pin LED. In this instance, the voltage ratio between I(ISET) and the sum of the photodiode current ISUM is constant (Electrical Characteristics Nos. 706 and 707). The current flowing through the resistor R1 is the setpoint for the control and directly presets the desired level of illumination. An internal capacitor ensures that the control is stable. The comparison point pin CSR is lead out in the BLCC20 package, enabling an external capacitor C2 to be connected to adapt the control behaviour. Lower values for R1 require larger values for C2, which also improve the power-supply rejection ratio for the control. Values from 10nF upwards are recommended. iC-OG 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER Rev C1, Page 8/9 A resistor in series with the LED limits the current in pin LED and sets the operating limits of the control. The optical feedback between the LED and the reference photodiodes should be good enough to establish an LED current of less than 15mA at room temperature. Only under these conditions does the power driver have a sufficient current reserve to correct the LED's decline in efficiency even at high temperatures. Control Monitor and Error Message Output The control monitor observes the potential at the CSR pin. Voltages which bring the power driver to saturation or off-state are recognized and indicated at the open-collector output by NER= low. APPLICATIONS INFORMATION Using the test aid The threshold current defined in the electrical characteristic No. 602 must be exceeded at both pins TIP and TIN simultaneously to activate the iC-OG's built-in test aid. Once it has been activated, the test aid does not switch back to off-state until the current drops below approx. 1µA. A clamp circuit as shown in Figure 2 also prevents falling below the test aid turn-on threshold for a short time. The output polarity of the iC-OG is to be changed over with the switch. Fig. 2: Wiring the test aid This specification is for a newly developed product. iC-Haus therefore reserves the right to change or update, without notice, any information contained herein, design and specification; and to discontinue or limit production or distribution of any product versions. Please contact iC-Haus to ascertain the current data. 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 on this site and does not assume liability for any errors or omissions in the 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. iC-OG 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER Rev C1, Page 9/9 ORDERING INFORMATION Type iC-OG iC-OG Package BLCC OGC Order designation iC-OG Chip iC-OG BLCC OGC For technical support, information about prices and terms of delivery 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 E-mail sales@ichaus.com Appointed local distributors: http://www.ichaus.de/support_distributors.php