DLPLCR4500EVM: DLPC350

Yu-Chuan Su

Prodigy 60 points

Part Number: DLPLCR4500EVM
Other Parts Discussed in Thread: DLPC350

Hi TI experts,

I am trying to use the DLPC350 I2C1 (J17) connector on a DLPLCR4500EVM to turn off its LEDs.

I used an Arduino board as the master, and the following code to access the DLPLCR4500EVM

Wire.beginTransmission(0x1A);
Wire.write(0x10);
Wire.write(0x00);
Wire.endTransmission();

However, the LEDs were still on and not affected.

The Arduino master did find the DLPLCR4500EVM with an address of 0x1A.

Actually, I did similar work using the J11 connector on a 4710EVM successfully with

Wire.beginTransmission(0x1B);
Wire.write(0x52);
Wire.write(0x00);
Wire.endTransmission();

Any thoughts, or suggestions?

Regards,

over 1 year ago

0 Lori Wang over 1 year ago

TI__Expert 8470 points

Hello user,

Welcome to the E2E forum and thank you for your interest in DLP® technology.

Our team expert will look into your question and get back to you soon.

Regards,

Lori

0 Alexander Chan over 1 year ago

TI__Expert 8100 points

Hi Yu-chuan,

In the DLPC350 programmers guide, it does mention the following.

https://www.ti.com/lit/pdf/dlpu010

Perhaps check I2C_ADDR_SEL value to make sure you are using the right I2C address.

Also please ensure you are meeting I2C timing requirements.

Thanks,

Alex Chan

0 Yu-Chuan Su over 1 year ago in reply to Alexander Chan

Prodigy 60 points

Hi Alex,

Many thanks for the reply.

The I2C_ADDR_SEL state was low and the address found by an I2C scanner was 0x1A.

As I mentioned, I did almost the same thing to a 4710EVM successfully.

Just wondering what the difference is between 4500EVM and 4710EVM regarding I2C communication.

Regards,

0 Akhil Guntumadugu over 1 year ago

TI__Expert 3675 points

Hello Yu Chan,

Before sending the sub-address you need to send ox34 or ox35 based on read/write operation.

TO diable all LEDs you need to send 0x1A, 0x34, 0x10, 0x00

where 0x1A: controller I2C address

0x34: Write operation

0x10: LED enable register sub-address

0x00: Data to diable all LEDs

Please refere to Section 1.1 (1.1.3 for write transmission) od the programers guide shared by Alex: https://www.ti.com/lit/pdf/dlpu010

Regards,

Akhil

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DLPLCR4500EVM: DLPC350