GP2W0002YP Datasheet, PDF (12/14 Pages) Sharp Electrionic Components – Low Power Infrared Transceiver

GP2W0001YP/GP2W0002YP
Low Power Infrared Transceiver
Evaluation Board
Figure 18 shows the recommended evaluation cir-
cuit for the GP2W0001YP/GP2W0002YP devices. This
circuit is provided on an evaluation board for test and
evaluation purposes. Samples are available through
your Sharp support office or Sales Representative.
The resistor value for RL is based on the supply volt-
age. For the one-meter range, the parallel combination
of the three values should be adjusted to approximately
2.2 Ω when V_CC = 3.3 V, yielding a forward current of
300 mA with approximately 200 mW being dissipated in
the resistors. For the 20 cm (reduced) range, the value is
adjusted to 33 Ω, the nominal forward current is 27 mA,
and the resistive power dissipation will be approximately
31 mW.
When the 33 Ω value and a forward current of 27 mA
is used, a total of 31.3 mW is dissipated during LED on-
time. This dissipation is within the rating of the SR1206
package. When used at a data rate of 115 Kbps, the
maximum on time is 18.75% of a bit time when the LED
is ‘ON.’ Since only the logical ‘0’ values of a data string
are sent, the overall duty cycle is below this value.
The board carries three positions to allow the use of
a combination of standard resistor values. To create
the 2.2 Ω value, three 6.6 Ω resistors are connected in
parallel. For the 43 Ω value, one 43 Ω resistor can be
used or three parallel resistors of 130 Ω. The resistor
positions on the board are in the SR1206 footprint,
which supports one-quarter Watt resistors.
This test and evaluation board is not intended for
production applications, and should not be subjected to
long periods at elevated temperature. Operation of the
board should be limited to free-air test conditions.
GND
V_CC
J1
1+
3+
5+
7+
9+
+ ^{2 VCC}
+ ^{4 TxD}
+ ^{6 RxD}
+8
+ ¹⁰
2×5
R₁
47 Ω
R_L 2.2 Ω - 33 Ω
R₅
R₄
R₃
C₂ 1,500 pF 25 V
R₂
1K
C₁
47 µF TANT
1
2
3
4
5
6
LEDA
TxD
SD
RxD
GND
V_CC
GP2W0001YP
Figure 18. GP2W0001YP Test Circuit
GP2W0001YP-36
12
Technical Information