ICHAUS IC-LGC 21-bit optical position encoder with serial/parallel and sin/cos output Datasheet

iC-LGC
21-BIT OPTICAL POSITION ENCODER WITH
SERIAL/PARALLEL AND SIN/COS OUTPUT
iC-LGC is an optoelectronic encoder iC for absolute position
sensors. Photosensors, amplifiers and comparators, the entire
signal conditioning and data processing unit and fast I/O interfaces are monolithically integrated on the chip.
Applications
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Absolute position encoders for safety-related controls
Analog and digital motor feedback systems
Robotics, tooling machines, servo drives
Features
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System-on-chip design with integrated photosensors
Excellent matching and reliability
Differential scanning for EMI immunity and operation
up to 125 °C
Enlarged assembly tolerance due to pre-positioned
and post-positioned code scanning
13 digital tracks pitched at just 500 μm
2 sine/cosine tracks with analog signal conditioning
Singleturn resolution of 16 to 21 bits by 3-bit flash or
8-bit S&H ADC
Multiturn data processing via 2-pin A/B or SSI interface,
embedded low power counter for battery supply
LED power control with a 50 mA highside driver
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Adjustable temperature sensor with min/max alarm
Operational monitoring and alarm/warning messaging:
missing code step, disc data error, configuration error,
LED end-of-life, out-of-range temperature
Safety features: CRC-protected setup with verification,
CRC-protected data output with life counter
Operating modes: hardware encoder (up to 16 bits), serial
encoder (SSI, BiSS C), parallel encoder (8-bit parallel µC)
4 to 5.5 V single supply operation, low power consumption
Small-outline optoBGA or BLCC package for SMT
Available accessories: LED lamps and code discs
Options: extended temperature range of -40 to +125 °C,
customized COB modules, customized code designs
40-pin BLCC Package LG5C
10.2 mm x 11.9 mm
44-pin optoBGA Package LG21C
8.0 mm x 10.0 mm
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-LGC
21-BIT OPTICAL POSITION ENCODER
The scanning unit uses pre-positioned and post-positioned
photosensors for each track to ease encoder assembly by moderating tolerances. Differential evaluation of all sensors enables
operation at high ambient temperatures. An integrated LED
power control with a highside driver guarantees illumination
regardless of temperature or ageing effects.
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.
External multiturn sensors can be operated via an SSI or A/B
counter interface; the count is maintained when a backup battery is connected. iC-LGC synchronizes and combines all data
to generate a single-step-proof position data word. The chip's
operation is monitored with configurable alarms; CRC verification of configuration data is also available.
The serial I/O interface in BiSS C protocol (SSI is optional) has
permanent bidirectional register communication. The user can
access released data areas (e.g. OEM data in the EEPROM)
without interfering with control cycles. Alternatively, the 8-bit
parallel microcontroller interface can be used for configuration
and data exchange.
Pin Functions
Key Specifications
General
Supply Voltage
4 V to 5.5 V, typ. 10 mA
MT Counter Supply
3.3 V to 5.5 V, typ. 4 µA during power-down
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)
Operational
Temperature Range
-20 °C to +90 °C
(-40 °C to +125 °C optional)
Chip Size
3.5 mm x 7 mm
Packages
(RoHS compliant)
40-pin BLCC LG5C (10.2 x 11.9 x 1.6 mm)
44-pin optoBGA LG21C (8.0 x 10.0 x 1.6 mm)
Options
on-chip reticle, reference code discs
Position Acquisition
Singleturn Resolution to 21 bits / 360° (@ sin/cos 8,192 PPR)
Multiturn Resolution to 24 bits
Angle Resolution
Disc LG2S 42-2048: 11+8 bits (524,288 CPT)
Disc LG3S 42-4096: 12+8 bits (1,048,576 CPT)
Absolute Angle
Accuracy
+/- 1 LSB @ 19 bits
(mounted within 0.7 degree tilt angle)
Operating Speed
12,000 RPM max.
Temperature Monitoring
Range, Resolution
-64 °C to +191 °C, resolution 1 °C (LSB)
Alarm Output
adjustable high/low alarm thresholds
Name
Pin Function
VDD, VCCA
+4 V to +5.5 V Digital and Analog Supply Voltage
GND, AGND
Digital and Analog Ground
Data Interfaces
VDDM
+3.0 to +5.5 V MT Counter Supply Voltage
Serial I/O Interface
LVCC
+4 V to +5.5 V LED Driver Supply Voltage
BiSS C, uni-/bidirectional, to 10 MHz
SSI, binary or Gray coded, to 4 MHz
LED
LED Current Source Output
μC Interface
8-bit data bus, 1 MHz access cycle per byte
RSET
LED Power Control Adjustment
MT Interface
VNSIN, VNCOS
Inverted Sin/Cos Voltage Outp. [Alignm. D1, D0]
ISIN, ICOS
Sin/Cos Current Outputs
2-pin A/B quadrature counter, to 300 Hz
2-pin serial SSI (200 kHz, 12+1 to 24+1 bit,
1 binary word or 3 to 6 Gray-coded words)
VREF
+2.5 V Reference Voltage Output
Analog Outputs
calibrated sine/cosine, 250 mVp, to 500 kHz
NPRES
Preset Input / Alignment Mode Enable
EEPROM Interface
I2C compatible, to 16 kbit, CRC error detection
NRES
Reset Input / Reset Indication Output
Data And Control Registers (RAM)
NDIR
Code Direction Reversal
Position Data
NERR
Error Message Output / System Error Input
3 bytes for singleturn (with interpolation),
3 bytes for multiturn, 2 bytes for CRC
SCL
EEPROM Interface, Clock Output
Temperature Data
1 byte
SDA
EEPROM Interface, Data Line
Calibration Data
5 bytes (signal conditioning, temperature sensor)
MDI
D(15)
MT Interface, Data Input or Counter Input B
/ Parallel Data Output
Configuration and
Operation
MCL
D(14)
MT Interface, Clock Output or Counter Input A
/ Parallel Data Output
33 bytes CRC-protected configuration, error byte,
life counter byte, command/status byte;
BiSS C direct access registers (bank switch,
EDS, profile, S/N, ID and measurement data)
SLO
D(13)
I/O Interface, Data Output
/ Parallel Data Output [Alignm. V1 xor V13, TP]
MA
D(12)
I/O Interface, Clock Input / Parallel Data Output
SLI
D(11)
I/O Interface, Data Input / Parallel Data Output
SYNC
D(10)
Synchronization Input / Parallel Data Output
NRD
D(9)µC Read Signal / Parallel Data Output
NWR
D(8)µC Write Signal / Parallel Data Output
P(7...0)
D(7...0)µC Data Bus / Parallel Data Output
NLµC Data Request Input / Par. Data Output Latch
Operational Functions
Parameterization
interface mode, resolution, disc model, multiturn
functions, output formats, code direction, alarm
messaging
Position Preset
via interfaces, or pin-triggered execution
Monitoring & Alarm
missing code step, corrupted single/multiturn
data (disc error), EEPROM link error, illumination
error (LED end-of-life), out-of-range temperature
Test and Alignment
analog sensor stimulation, alignment aids for
radial position and tilt angle
Setup
EEPROM, μC Interface or serial I/O (BiSS C)
TVN, TNN, TNP, TVP Test Mode Current Inputs
This tentative information shall not be considered as a guarantee of characteristics. Rights to technical changes reserved.
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
Rev. 1.0
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