Connecting 3 LEDs Red, Green IR to ADPD105

subbu on Nov 29, 2021

Hi,

I am working on testing of EVAL-ADPD105. ADPD105 Supports connecting 3 LEDs through LEDX1, LEDX2, LEDX3. I want to connect Red, IR, Green LED to these pins. But based on the register configuration we can enable only 2 LEDs in a particular time slot based on register configuration in 0x14.

If We want to control the 3rd LED How can be do that.

0 GlenBu

on Nov 30, 2021 6:55 PM
Hi there,

The ADPD105 operates two independent time slots, Time Slot A and Time Slot B, allowing two measurements. You can only enable one LED driver in either Time Slot A or Time Slot B by setting proper bit in register 0x14. Unfortunately the ADPD105 does not support a third time slot hence you have to connect at least two LEDs of different color to a single LED driver if your application allows.

We encourage you to take a look at our latest photometric AFE ADPD4100 (https://www.analog.com/en/products/adpd4101.html). The ADPD4100 support up to 12 time slots and can enable up to 4 LED drivers during any time slot for fine control of the LED current.

Regards,

Glen B.
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