GP2W0110YPS Datasheet, PDF (11/14 Pages) Sharp Electrionic Components – Low Power Infrared Transceiver

Low Power Infrared Transceiver
GP2W0110YPS/GP2W0114YPS
Designing an IR Cosmetic Window
Figure 15 and its calculations show an example and
design tip for a cabinet and IR cosmetic window with
+18° viewing angles, in both vertical and horizontal
axes. All values for the transceiver dimensions are only
for design reference, and are given in mm. The IrDA
specifications require a +15° viewing angle at the trans-
ceiver. The +18° angle shown provides a little extra
clearance to allow for slight manufacturing variations,
so that the required angle is always met.
The optical window size should be the minimum size
of W × H rectangular or elliptical in order to maintain
IrDA data transfer performance. The dimensions for
width can be calculated by the formula of:
W = 2 × L × tan18 + w
And the dimensions for height can be calculated by
the formula of:
H = 2 × L × tan18 + h
In the case of having a view angle of ±18°, which
conforms to or exceeds the IrDA Serial Infrared Physi-
cal Layer Link Specifications. Any values to be calcu-
lated with above formula are given in mm.
The dimension 7.9 mm as used in Figure 15 and its
calculations, is the physical length of the transceiver.
This distance also includes the side angles of the optical
lenses to simplify the overall calculation. The height of
the transceiver is 2.15 mm with the shield; however, the
actual transceiver face in the optical resin is 2.0 mm.
These dimensions are listed in the mechanical drawings.
L
w
18°
(7.9)
18°
L
W
18°
h
(2.0)
18°
NOTE: Dimensions are in mm.
Figure 15. Optical Window Aperture
H
GP2W0110YPS-12
IrDA Technical Information
11