hsdl-9100 Avago Technologies, hsdl-9100 Datasheet - Page 11

• Manufacturer Part Number: hsdl-9100
• Description: Surface-mount Proximity Sensor
• Manufacturer: Avago Technologies

Appendix B: General Application Guide for the HSDL-9100
Description
The Proximity sensor has several possible applications for
multimedia product, Automation, and Personal handled.
The proximity sensor is basically made up of the emitter
(infrared LED) and detector (photodiode). The block
diagram of the sensor is shown in Figure 13. The emitter
will emit IR light pulse. This light travels out in the field
of view and will either hit an object or continue. No light
will be reflected when no object is detected. On the other
hand, the detector will detect the reflected IR light when
it hits the object.
Figure 13. Proximity sensor block diagram
(refer to Pins Configuration Table)
*
Figure 14. Mobile Application Platform
Photodiode
cathode
anode
The LED can be driven by the PWM output or the external timer circuitry.
LED
Memory Expansion
3
2
Photodiode
SDRAM
LED
FLASH
ROM
4
1
Logic Bus Driver
Touch Panel
Photodiode
cathode
anode
LED
Power Management
STN/TFT LCD Panel
Memory I/F
A/D
LCD Control
Mobile Application
Baseband
controller
Antenna
chipset
Interface to the Recommended I/O chip
The HSDL-9100 is general interface with the GPIO pin of
the controller chipset. The LED_A, pin1 is connected to
the PWM port alternatively the external timer circuitry
can be used to drive the LED. The DET_K, pin 4 is interface
to the signal conditioning before driving the GPIO port.
Figure 14 shows the hardware reference design with
HSDL-9100.
Signal Conditional
Peripherial
GPIO
interface
Key Pad
HSDL-9100
interface
sound
PWM
AC97
IrDA
I2S
*IR LED driver
IR Transceiver
Audio Input
PCM Sound