TSL2671
DIGITAL PROXIMITY DETECTOR
TAOS118 ? JANUARY 2011
APPLICATION INFORMATION: HARDWARE
If the hardware application requires more than 100 mA of current to drive the LED, then an external transistor
should be used. Note, R2 should be sized adequately to bias the gate voltage given the LDR current mode
setting. See Figure 15.
V BUS
1 m F
V DD(analog)
R2
LED
V DD(digital)
1 m F
R P
R P
R PI
R1
LDR
TSL2671
INT
SCL
SDA
Figure 15. Application Hardware Circuit for Proximity Sensing with External LED Driver Using P-FET
Transistor
PCB Pad Layout
Suggested PCB pad layout guidelines for the Dual Flat No-Lead (FN) surface mount package are shown in
Figure 16.
Note: Pads can be
2500
extended further if hand
1000
1000
soldering is needed.
400
650
1700
650
400
NOTES: A. All linear dimensions are in micrometers.
B. This drawing is subject to change without notice.
Figure 16. Suggested FN Package PCB Layout
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2011, TAOS Inc.
21
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