31

Note that the built-in IR LED cathode is internally connected to the LED-K pin.

The APDS-9500 provides for an additional LED drive with the LDR_2 pin. If an external IR LED is to be used, connect it

to the LDR_2 pin as shown below.

It is possible to combine the drive current of the two LED drive pins together. In this case, the connection is shown

below.

GND

NC

LED-A

LDR_2

LED-K_1

SPI_CLK

SPI_CSn

VDDAY_I/O

VDDA_I/O

VDD18_I/O

VDD

SPI_DATA

SPI_MCLK

VIO

APDS-9500

10 μF

1 μF

VLED

External LED

GND

NC

LED-A

LDR_2

LED-K_1

SPI_CLK

SPI_CSn

VDDAY_I/O

VDDA_I/O

VDD18_I/O

VDD

SPI_DATA

SPI_MCLK

VIO

APDS-9500

10 μF

1 μF

VLED