IC-OG_12 Datasheet, PDF (2/10 Pages) IC-Haus GmbH – 8-BIT DIFFERENTIAL SCANNING OPTO ENCODER

iC-OG
preliminary
8-BIT DIFFERENTIAL SCANNING OPTO ENCODER
Rev D1, Page 2/10
DESCRIPTION
iC-OG is an optoelectronic sensor IC for linear and
rotary motion control systems, such as glass scales
or shaft encoders, for example.
Photodiodes, amplifiers, comparators and TTL-
compatible push-pull output drivers are integrated
monolithically. Each of the 8 tracks is evaluated dif-
ferentially; 3 tracks feature additional high-side and
low-side current sources and output a push-pull ana-
log signal.
The integrated LED current control with its driver
stage connects to the encoder LED and ensures a
constant optical received power. A series resistor
is used here as current limiter, and thus defines the
control’s operating range. If the LED current control
reaches operating limits, error message output NER
indicates a low signal (LED end-of-life, or open loop
conditions).
Tracks 0 and 1 with their differential scanning pho-
todiodes provide a sum current for LED controlling,
averaged by the capacitor at pin CSR. The sum cur-
rent is compared with the setpoint adjusted by the
external resistor at pin ISET.
Two test pins (TIP, TIN) allow a full test of all chip
functions to be carried out excluding the photodiodes.
All push-pull and analog outputs are protected
against ESD and short-circuit damage. The error
message output NER is also protected against short-
circuiting and can be used in bus systems due to its
open-collector output.
PACKAGES
PAD LAYOUT / CHIP LAYOUT
Chip size 3.05 mm x 5.1 mm
PAD FUNCTIONS
No. Name Function
See pin functions.
Notes
The optical sensor axis is not exactly
the chip center.