IC-LNG_14 Datasheet, PDF (2/30 Pages) IC-Haus GmbH – 16-BIT OPTO ENCODER

iC-LNG 16-BIT OPTO ENCODER ^preliminary
WITH SPI AND SERIAL / PARALLEL OUTPUTS
Rev B1, Page 2/30
DESCRIPTION
iC-LNG is an optoelectronic encoder IC for absolute
linear and angle measuring systems, such as glass
scales and encoders. Photodiodes, amplifiers, and
comparators, the entire signal conditioning unit, and
interfaces for position data output have been mono-
lithically integrated into the device.
An integrated LED current control with a driver stage
allows a transmitting LED to be directly connected
(e.g. iC-SN85). The optical receive power is kept
constant by the control unit, regardless of tempera-
ture and aging effects. The receive power setpoint
can be programmed. Should the LED current control
exit its operating range, this is indicated at the error
message output (end-of-life alarm at pin ERR).
The photocurrent offset and photocurrent amplitude
of the analog sine/cosine signals can be calibrated.
These calibrated voltage signals are lead out to pins
PSIN, NSIN, PCOS, and NCOS and are used by the
integrated 6-bit interpolator.
iC-LNG synchronizes the interpolator and singleturn
data to form a contiguous Gray-coded position data
word. A shift register or SPI interface are available
for position data output. iC-LNG also outputs incre-
mental A/B/Z signals, the resolution of which can be
programmed.
After startup iC-LNG is configured using the SPI in-
terface. To make connection to a 3.3 V microcon-
troller easier, all digital I/O ports, including the SPI,
can be run on 3.3 V.
Test currents can be applied to test pins TPS, TNS,
TPC, and TNC to simulate photocurrents. Allocation
to various tracks can be selected as required, en-
abling a full function test of the IC with the exception
of the sensors.