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 mod-
erating 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 bat-
tery 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 verifica-
tion 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.
Key Specifications
General
Supply Voltage
MT Counter Supply
On-Chip Oscillator
LED Power Control
ESD Susceptibilty
Operational
Temperature Range
Chip Size
Packages
(RoHS compliant)
Options
Position Acquisition
Singleturn Resolution to 21 bits / 360° (@ sin/cos 8,192 PPR)
Multiturn Resolution to 24 bits
Angle Resolution
Absolute Angle
Accuracy
Operating Speed
Disc LG2S 42-2048: 11+8 bits (524,288 CPT)
Disc LG3S 42-4096: 12+8 bits (1,048,576 CPT)
+/- 1 LSB @ 19 bits
(mounted within 0.7 degree tilt angle)
12,000 RPM max.
4 V to 5.5 V, typ. 10 mA
3.3 V to 5.5 V, typ. 4 μA during power-down
5 MHz
50 mA max. (highside current source output)
2 kV (HBM 100 pF, 1.5 kΩ)
-20 °C to +90 °C
(-40 °C to +125 °C optional)
3.5 mm x 7 mm
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)
on-chip reticle, reference code discs
Pin Functions
Name
VDD, VCCA
GND, AGND
VDDM
LVCC
LED
RSET
VNSIN, VNCOS
ISIN, ICOS
VREF
NPRES
NRES
NDIR
NERR
SCL
SDA
MDI
MCL
SLO
MA
SLI
SYNC
NRD
NWR
P(7...0)
NL
D(15)
D(14)
D(13)
D(12)
D(11)
D(10)
D(9)
D(8)
D(7...0)
Pin Function
+4 V to +5.5 V Digital and Analog Supply Voltage
Digital and Analog Ground
+3.0 to +5.5 V MT Counter Supply Voltage
+4 V to +5.5 V LED Driver Supply Voltage
LED Current Source Output
LED Power Control Adjustment
Inverted Sin/Cos Voltage Outp. [Alignm. D1, D0]
Sin/Cos Current Outputs
+2.5 V Reference Voltage Output
Preset Input / Alignment Mode Enable
Reset Input / Reset Indication Output
Code Direction Reversal
Error Message Output / System Error Input
EEPROM Interface, Clock Output
EEPROM Interface, Data Line
MT Interface, Data Input or Counter Input B
/ Parallel Data Output
MT Interface, Clock Output or Counter Input A
/ Parallel Data Output
I/O Interface, Data Output
/ Parallel Data Output [Alignm. V1 xor V13, TP]
I/O Interface, Clock Input / Parallel Data Output
I/O Interface, Data Input / Parallel Data Output
Synchronization Input / Parallel Data Output
μC Read Signal / Parallel Data Output
μC Write Signal / Parallel Data Output
μC Data Bus / Parallel Data Output
μC Data Request Input / Par. Data Output Latch
Temperature Monitoring
Range, Resolution
Alarm Output
Data Interfaces
Serial I/O Interface
μC Interface
MT Interface
BiSS C, uni-/bidirectional, to 10 MHz
SSI, binary or Gray coded, to 4 MHz
8-bit data bus, 1 MHz access cycle per byte
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)
calibrated sine/cosine, 250 mVp, to 500 kHz
I
2
C compatible, to 16 kbit, CRC error detection
-64 °C to +191 °C, resolution 1 °C (LSB)
adjustable high/low alarm thresholds
Analog Outputs
EEPROM Interface
Data And Control Registers (RAM)
Position Data
Temperature Data
Calibration Data
Configuration and
Operation
3 bytes for singleturn (with interpolation),
3 bytes for multiturn, 2 bytes for CRC
1 byte
5 bytes (signal conditioning, temperature sensor)
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)
Operational Functions
Parameterization
interface mode, resolution, disc model, multiturn
functions, output formats, code direction, alarm
messaging
via interfaces, or pin-triggered execution
missing code step, corrupted single/multiturn
data (disc error), EEPROM link error, illumination
error (LED end-of-life), out-of-range temperature
analog sensor stimulation, alignment aids for
radial position and tilt angle
EEPROM, μC Interface or serial I/O (BiSS C)
Position Preset
Monitoring & Alarm
Test and Alignment
Setup
TVN, TNN, TNP, TVP Test Mode Current Inputs
This tentative information shall not be considered as a guarantee of cha-
racteristics. 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
ICHAUS [ IC-HAUS GMBH ]
