LM3644: IR laser driver does not working

muhammet kocak

Prodigy 50 points

Part Number: LM3644

Hi I want to drive LM3644 using MCU. My strobe signal from Camera is connected to LM3644.

TX Pin diasbled 0

Strobe type 0

Strobe enable 1

Torch pin 0

Mode IR drive 01

LED2 off 0

LED 1 ENABLE

0x25 my enable register value. There is no connection error between IC and MCU, There is no error flag from the flag registers.

Where could I doing mistake at ? My IR laser is not working.

over 1 year ago

0 Jared Zhou over 1 year ago

TI__Genius 14085 points

Hi Kocak,

Using IR mode requires not only configuring the Enable register, but also toggling the STROBE pin.

So now you have configured the Enable register, you need to check your STROBE pin connection and toggle it. Then, you will see the IR laser is working.

Btw, you can find more detail information in Section 8.3.3 IR mode in datasheet, the link is below:

https://www.ti.com/lit/ds/symlink/lm3644.pdf?ts=1685065047374&ref_url=https%253A%252F%252Fwww.google.com%252F

Best Regards,

Jared

Power management

Power management forum

LM3644: IR laser driver does not working