iC-LG 21-BIT OPTICAL POSITION ENCODER WITH SERIAL/PARALLEL AND SIN/COS OUTPUT iC-LG is an optoelectronic encoder iC for absolute linear or angular measuring systems, such as glass scales and shaft encoders. Photosensors, amplifiers and comparators, the entire signal conditioning unit and interfaces for the position data output are monolithically integrated on the chip. Applications – Optical high-resolution absolute position encoders – Analog and digital moto feedback systems – Robotics, tooling machines, servo motors Features – Excellent matching and reliability granted by system-on-chip design with integrated photosensors – Differential track evaluation and signal-related hysteresis comparators grant EMI immunity and operation up to 125 °C – High assembly tolerance due to synchronized scanning principle using pre- and post-positioned photosensors – 13 digital tracks pitched at just 500 µm – 2 sine/cosine analog tracks with enlarged photosensors and electronic calibration features – Position data resolution of 16 to 21 bits by on-chip interpolation (by 3-bit flash or 8-bit S&H ADC) – Services external multiturn encoders and interpolation ICs – LED power control with a 50 mA highside driver – Adjustable on-chip temperature sensor with a min/max alarm – Operational monitoring with alarm output for missing code, corrupted single/multiturn data (disc error), EEPROM link error, illumination error (end of life), out-of-range temperature – Interface modes: parallel encoder, serial BiSS/SSI, µC – 4 to 5.5 V single supply operation, low power consumption – Options: extended temperature range of -40 to +125 °C, customized COB assemblies, reticles and code discs 40-pin BLCC Package LG5C 10.2 mm x 11.9 mm Scale 3:1 Am Kuemmerling 18 • D -55294 Bodenheim, Germany Tel. +49 61 35 / 92 92-30 0 • Fax +49 61 35 / 92 92-19 2 • http://www.ichaus.com iC-LG 21-BIT OPTICAL POSITION ENCODER The differential evaluation of all tracks enables operation at high ambient temperatures. Scanning uses pre- and post-positioned photosensors for each track, permitting high adjustment tolerances during system assembly. An integrated LED power control with a highside driver guarantees illumination regardless of temperature or aging effects. Key Specifications General Supply Voltage single 4 V to 5.5 V Supply Current typ. 10 mA The chip features offset and amplitude calibration for the analog output signals also fed to the integrated 3-bit flash and the 8-bit SAR interpolators. On-Chip Oscillator 5 MHz LED Power Control 50 mA max. (highside current source output) ESD Susceptibilty 2 kV (HBM 100 pF, 1.5 kΩ) External multiturn sensor slaves can be operated via an SSI interface. Here, iC-LG is master and synchronizes all data to produce a contiguous, single-step-proof position data word. Additionally, temperature data is available from an on-chip sensor, featuring adjustable high/low alarms to monitor encoder and drive operation. Operational Temperature Range -20 °C to +90 °C (-40 °C to +125 °C optional) Chip Size 3.5 mm x 7 mm Packages 40-pin BLCC LG5C (10.2 x 11.9 x 1.7 mm) smaller optoBGA package on request Options on-chip reticle, code discs The fast BiSS interface (SSI mode is optional) and an 8-bit microcontroller interface are available to output the position data and to configure the chip. An external EEPROM can also provide setup and OEM data. Pin Functions BiSS µC PAR Name 1 NDIR 2 SYNC 3 NPRES Preset Input / Alignment Mode Enable 4 NRES Reset Input / Reset Active Message Pin Function Reversal of Rotation Dir. Input Synch. Input / Parallel Data Output 5 NRD D(9) Read Signal / Par. Data Output 6 NWR D(8) Write Signal / Par. Data Output 9 VREF 10 RSET 13...20 Max. Singleturn Resolution 21 bits / 360° (extendable by consecutive electronics) Max. Multiturn Resolution 24 bits Angle Resolution (disc LG2S) 11+3 bits, 11+8 bits (524,288 CPT) Absolute Angle Accuracy +/- 1 LSB @ 19 bits (mounted within 0.7 DEG tilt angle) Max. Operating Speed 12,000 RPM Interface Mode No. D(10) Position Acquisition +2.5 V Reference Voltage Output LED Power Control Adjustment P(7...0) D(7...0) Data Bus µC / Par. Data Output Temperature Monitoring Range, Resolution -64 °C to +191 °C, resolution 1 °C (LSB) Alarm Output adjustable high/low alarm thresholds Data I/O BiSS Interface serial two-wire link, triggered position capture, data rate of up to 15 Mbit/s (SSI mode: 4 Mbit/s) µC Interface 8-bit data bus, 1 MHz access cycle per byte SSI, 200 kbit/s, 12+1 to 24+1 bit, binary coded (single word) or Gray coded (3 to 6 words) 21 SCL Clock Output, Configuration Interface Multiturn Sensor Interface 22 SDA Data Line, Configuration Interface Analog Outputs 23 VDDM +5 V Multiturn Functions Supply Voltage sine/cosine wave output to 500 kHz, 0.5 Vpp calibrated 24 LVCC +5 V LED Driver Supply Voltage Serial EEPROM 100 kbit/s, compatible with I2C, 1 to 16 kbits 25 LED LED Current Source Output 26 VNCOS Cosine Voltage Output (inverted) (Alignment Mode: Voltage Output D0) 27 ICOS Cosine Current Output 28 VNSIN Sine Voltage Output (inverted) (Alignment Mode: Voltage Output D1) 29 ISIN Sine Current Output 30 VCCA +5 V Analog Supply Voltage 31 AGND Analog Ground 32 GND Digital Ground 33 VDD +5 V Digital Supply Voltage 34 NERR Error Message I/O 35 NL RAM Position Data 3 bytes for singleturn (with interpolation), 3 bytes for multiturn Temperature Data 1 byte Calibration Data 5 bytes (analog signals and temperature sensor calibration) Configuration Data 27 bytes for configuration, 8 bytes for device ID Operational Functions Device Configuration via EEPROM, BiSS, µC Interface Parameterization resolution, disc model, multiturn functions, output code format, sense of rotation, alarm messages Output Latch Enable Input 36 MDI Data Input, Multiturn Interface Position Preset selectable by pin, BiSS, µC Interface 37 MCL D14 Clock Output, Multit. / Par. Data Output Monitoring & Alarm 38 SLO D13 Data Output, BiSS / Par. Data Output (Alignment M.: V1 xor V13, Test M.: TP) missing code, corrupted single/multiturn data (disc error), EEPROM link error, illumination error (end of life), out-of-range temperature 39 MA D12 Clock Input, BiSS / Par. Data Output Test Modes analog sensor stimulation 40 SLI D11 Data Input, BiSS / Par. Data Output Alignment Modes radial position and tilt angle alignment aids 7, 8, 11, 12 Test Mode Current Input Am Kuemmerling 18 • D -55294 Bodenheim, Germany Tel. +49 61 35 / 92 92-30 0 • Fax +49 61 35 / 92 92-19 2 • http://www.ichaus.com