CCS/TPS65982-EVM: I2C communication with TPS65982

Karol Mika

Part Number: TPS65982-EVM
Other Parts Discussed in Thread: TPS65982

Tool/software: Code Composer Studio

Hello,

I have question regarding I2C communication with TPS65982 Evaluation module. I'm trying to read some information like available PD profiles using I2C interface. I conected my stm32f0 discovery board with TPS65982 EVM but I2C communication won't work. Library on stm for i2c is reliable because I used it without any problems with other IC, but on TPS65982 I can't makie it work. On my logic analyzer I see data that I'm sending but there is no ACK from TPS, and also no back data. Could anyone help me with some ideas what I might do wrong here ?

To reduce possible questions, below are some basic information about my set up:
- connection to I2C1 on pin 18 and 20
- I2C Clock speed: 100kHz
- Address: 0x38
- TPS65982 is sourced by some PD Charger using USB Type C connection (12V)

Thanks in advance,
Karol Mika

over 7 years ago

0 Praneet Kumar over 7 years ago

TI__Genius 16370 points

Karol, Hope you are using Pin-18 and Pin-20 for SCL and SDA respectively. Can you share the I2C logs? Can you have a barrel-jack connected to the EVM when trying to access the I2C?

Thanks & Regards,
Praneet

0 Praneet Kumar over 7 years ago in reply to Praneet Kumar

TI__Genius 16370 points

Karol, Let me know if you still need help w/ this post?

-/Praneet

0 Aramis P. Alvarez over 7 years ago in reply to Praneet Kumar

TI__Genius 10370 points

Hi Karol,

Since it's been a while that we hear from you, I'm going to go ahead consider this thread closed. Feel free to re-post a new thread if you have any further issues with our parts. If this answers your question, PLEASE select This resolved my issue

0 Karol Mika over 7 years ago in reply to Aramis P. Alvarez

Prodigy 70 points

Hi,

Thanks for your suggestion but it didn't solve my problem. Sorry that you didn't hear from me for so long but I had to take care of more important projects. Yes, I'm using pin18 (for SCL) and pin19 (for SDA). I've also try to use barrel jack connection, but it didn't change anything. Here are my I2C logs:

Once again, thanks for your insights.

Best Regards
Karol Mika

0 Praneet Kumar over 7 years ago in reply to Karol Mika

TI__Genius 16370 points

Karol,

0x38 is the 7-bit address.

I think the issue is caused 'coz you are not left shifting the address - Use "(slave_addr << 1) | rw" (rw = 1 for read and 0 for write).

Below is my I2C log snippet for communicating w/ our device on address 0x38 for write and read respectively.

-/Praneet

0 Karol Mika over 7 years ago in reply to Praneet Kumar

Prodigy 70 points

Praneet,

thank you so much for your advice. It helps me to resolve my issue. You were right, mistake I made was using 0x38(write) and 0x39(read) addr instead of 0x70(write) and 0x71(read).

Best Regards

Interface

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CCS/TPS65982-EVM: I2C communication with TPS65982