iC-WG
14-BIT DIFFERENTIAL SCANNING OPTO ENCODER
Rev B0, Page 2/11
DESCRIPTION
The iC-WG is an optoelectronic detector IC for linear and angle measuring systems, e.g. glass scales or
rotary encoders. Monolithically integrated are photodiodes, amplifiers and comparators as well as
TTL-compatible push-pull output drivers. All 14 tracks are differentially evaluated.
An integrated LED current control with driver stage makes it possible to directly connect a transmit LED
with series resistor and also guarantees a constant optical received power. The setpoint for the receive
current is adjusted via an external resistor. If the LED current control deviates from its working range, this
is indicated at the error message output.
For the adjustment of a reticle the chip features two adjustment crosses and supplies the analog signals
from three monitor photocurrent amplifiers. For exact radial alignment of the iC-WG (with reticle) to the
code disk, two monitor photodiodes are arranged such that the track position can be checked (option, not
available in the standard SMD package).
Two test pins permit a complete electrical functional test of the IC not including the photodiodes.
All push-pull and analog outputs are protected against ESD and short-circuits. The error message output
NERR is also short-circuit-proof and due to it’s open-collector design bus capable.
PAD DESCRIPTION
Name
Function
GND
IN0
IP0
IN1
IP1
Ground
Track N0 Analog Output (current sink)
Track P0 Analog Output (current sink)
Track N1 Analog Output (current sink)
Track P1 Analog Output (current sink)
RGND Reference Ground for RSR circuitry
RSR
LED
LED Current Control Setup
LED Driver Output
LGND LED Driver Power Ground
NERR Error Message Output, low active
CSR
TIP
TIN
VCC
A13
A12
..
External capacitor for LED control
Positive Test Aid Input
Negative Test Aid Input
+5 to +20V Supply Voltage
Track 13 Push-Pull Output
"
"
A0
Track 0 Push-Pull Output
ICHAUS [ IC-HAUS GMBH ]
