Datasheet

12
Figure 15. HSDL9100 conguration with controller chipset
The next section discusses interfacing conguration with
general processor including the recommended signal
conditional circuitry.
The DET_A pin of HSDL-9100 is connected to the lter
circuit then to the comparator before interfacing with
the GPIO pin. The lter circuit is implement to provide
the ambient light lter. The PWM is pulse to drive the
LED_K pin alternative the external timer 555 can also be
replaced. The detector distance can be varies with the
increase/decrease of the LED current supply.
Interfacing circuitry with signal conditional circuitry
10 Ω
GND
PWM
220 Ω
BC848
LEDK
LEDA
VCC
DETK
DETA
GND GND
BC846B
1 MΩ
VCC
VCC
24 KΩ
36 KΩ
22 KΩ
220 pf
VCC
47 kΩ
300 Ω
GND
Signal conditioning circuitry
GPIO
HSDL-9100
controller chipset