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I2C
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  • Forum Post: Using PCA9306 for OMAP3503 application and I notice the PCA9306 is dumping 21- 27ma current into the 1.8V rail

    Lance Forman
    We are using two PCA9306 devices for I2C level translation on OMAP3503 application and I notice the PCA9306 is dumping 21- 27ma current into the 1.8V rail. It is translating from 1.8V logic to 3.3V logic. I have 1.1K pullup on SDL and SDA lines to 3.3V and 4.7K pulllup on the 1.8V logic side. ...
    on Feb 3, 2010

  • Forum Post: Problem during the first ic2 read operation

    Murilo Travaglia
    Hi all, I'm debuging the i2c communication in my board. To do read and write operations I'm using an I/O Expander, PCF8575. After enabling the i2c, if my first operation is read in I/O Expander I get an error and read operation isn't done. If a try to do same operation I get an error...
    on Dec 2, 2010

  • Forum Post: Possible PCA9555 power-on-reset problem, will TCA9555 help?

    Stan70812
    Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 ...
    on Apr 8, 2011

  • Forum Post: 16-bit I2C addressing?

    Doug McKenney
    We need more that 10 bits of address for our custom sensor chip. We may have up to 64K of them in a system. We'll be using a lot of TI chips - extenders, repeaters, hubs, etc. The I2C standard only allows 7 or 10 bit addressing. I need some ideas to enable 16-bit addressing in I2C. Any ideas out...
    on May 23, 2011

  • Forum Post: Re: TCA9535 communications with I2C master device

    Salvatore Torre
    If I have Vref1 connected to 3.3V and Vref2 connected to 5V, can I connect EN to 3.3V? The datasheet only shows application circuits where 5V is connected to EN (via a 200k series resistor), but my MCU outputs 3.3V. Thanks.
    on Jun 9, 2011

  • Forum Post: Advice on I2C star configuration

    Bernard McDavitt
    Hi, I am currently designing a product which will require I2C to be configured in a star configuration and could use some advice on the best approach. The product is for LED lighting and will have one micro-controller in the center, with 3 to 5 smaller boards using the TLC59116 LED driver...
    on Aug 6, 2011

  • Forum Post: Simple I2C level translator

    Owen Wetzel
    Hello all, this might be viewed as a very simplistic topic, but I will ask nonetheless. I have been using, rather unsuccesfully, the PCA9306 from NXP to interface a 3.3V MCU to a 5V (TTL) host device. Everything works fine with cables (I use cables on the input and output side) that are short ...
    on Aug 12, 2011

  • Forum Post: TS3USB221 on I2C Signals

    Ivy Ong
    Hi, I would like to ask if TS3USB221 can be use to switch I2C Signals? Thanks
    on Nov 13, 2011

  • Forum Post: SCL and SDA trace separation?

    Tim Baker
    Hi, For the two I2C bus traces, SCL and SDA, is there any requirement on their separation? Even in fast I2C mode which runs at 400KHz, it is still much slower than DDR2 memory, USB and many other high-speed devices. However, for DDR2, USB and SATA, there are specific requirements on routing...
    on Dec 21, 2011

  • Forum Post: SCL and SDA length difference?

    Tim Baker
    Hi, For SCL and SDA traces, is there any requirement on equal length? Assuming 400KHZ fast I2C mode, if by board routing constraints SCL and SDA traces cannot have equal length, how much could they differ in length? Tim
    on Dec 21, 2011

  • Forum Post: I2C: 4mil SCL and SDA separation, how slow should clock be?

    Tim Baker
    Hi, Does anyone have idea on the minimum separation for SCL and SDA traces of I2C? It is very common for ICs using I2C protocol to have SCL and SDA pins next to each other, and at many times traces extending from the two pins are also parallel. However, on a really dense board where routing...
    on Dec 22, 2011

  • Forum Post: PCA9306 VREF1/VREF2 current sink

    Huang P.J.
    Hi, I am using PCA9306, one question is related the power supplies I need to provided to VREF1 and VREF2 pins. When IO SCL1/SDA1 or SCL2/SDA2 sink a big current, for example 100mA(datasheet limit is 128mA). Do they reflect to VREF1/2 that my power supplies need a good reguation capability? or...
    on Jan 20, 2012

  • Forum Post: MSP430F2272 interfacing with Led controller TCA6507 via I2C

    Abdullah Ziya ARGILLI
    I have designed the circuit which can be found below, but my MSP430F2272 can't communicate with TCA6507. I'm using 5.6kOhm pullup resistors, the supply voltage of both ICs are 3.3V with same ground. I've also tried to add up 10kOhm pullup resistor (15k total) but nothing changed. When SDA...
    on Jan 21, 2012

  • Forum Post: TCA9535 Interrupt

    Sudip Saha
    Hi, I am using TCA9535 in my project to interface a keypad to uController (MSP430F5529). The interrupt pin of TCA9535 is connected to (Interrupt enabled) input pin of uController. I have observed that when a key is pressed the interrupt goes low, however when the uController reads the input registers...
    on Feb 14, 2012

  • Forum Post: PCA9515A I2C buffer

    Mark Bartels
    Hello fellow engineers, I am using the ti version of PCA9515A I2C buffer on a development board that I designed and layed out. I am using a 3.3V I2C bus driven by an mbed microcontroller with 5.1k pull up resistors before and after the buffer. On this dev board I have 4 of these buffers (not in series...
    on Mar 30, 2012

  • Forum Post: TCA4311A Startup problem

    Ankit Kumar
    I am using TCA4311A I2C bus Buffer and i am facing problem in power on startup of this device i.e. the buffer_ready output does not go high. I have checked the voltages on all pins and the following is observed: VCC = 3.3V SDAOUT = 3.3V SCLOUT = 3.3V EN = 3.3V But BUFF_REady output...
    on Apr 17, 2012

  • Forum Post: TCA 8418 (Key Pad Controller)

    AVINASH NEETHI
    Hi All, I am currently working on am335x processor .I that particularly in tca8414 keypad controller chip. can any one provide the sample code for I2C keyboard controller driver for U-Boot(chip: tca8418 ) ,not for linux. Thanks and Regards Avinash
    on May 1, 2012

  • Forum Post: TXB v/s TXS device selection

    Anool Mahidharia
    I'm working on a design involving processors at different voltage levels. 1. I need to interface a uSD card with an Atmel ATMega328. Is the TXB0104 a suitable and correct device for such an application ? 2. I need to set up bi-directional communication between a Broadcom BCM2835 processor...
    on Jun 9, 2012

  • Forum Post: RE: TXB v/s TXS device selection

    Anool Mahidharia
    Hi, Junjie, Thanks for that clarification. I was confused because the suggestion I got on the Raspberry-Pi forum was to go for the TXB series device. I'll post back here after we actually test it out.
    on Jun 11, 2012

  • Forum Post: RE: TCA 8418 I2C Communication

    Linux_Arasi
    Hi... Thank you for kind responsble answer... This TCA8418 driver is loaded as a module to kernel 3.2.0. It is ported after cross compiling to am335x process eventhought event is not found in /dev directory.This am335x i2c is communicating throught I2C_2 SDA,SCL lines. I found in my /dev dirctory...
    on Jul 23, 2012

  • Forum Post: RE: I2C Level Shifting

    Augusto
    Para Albert..! Adquirir recentemente o:"MSP430FG4618/F2013 Experimenter’s Board". Possível desenvolver uma solução para o meu problema com o:"MSP430FG4618/F2013 Experimenter's Board." Augusto.
    on Aug 2, 2012

  • Forum Post: RE: TCA 8418 I2C Communication

    Linux_Arasi
    Hi... I am trying to interface TCA8418 keyboard with am335x processor throught I2C communication.So I have cross compiled the TI kernel version 3.2.0 for arago toolchain. Now I2C_3 line is working fine to communicate board with processor. Eventhought TCA8418 driver added as a module, Compilation...
    on Aug 2, 2012

  • Forum Post: RE: TCA 8418 I2C Communication

    Linux_Arasi
    Hi .... Thank you for valuable answer... As per your advice have modified everthing in kernel regarding TCA8418 driver, Except below mentioned file because it's already existed in kernel as board-am335xevm.c File:arch/arm/mach-omap2/board-am33xevm.c so i didn't change anything.(i am using...
    on Aug 3, 2012

  • Forum Post: RE: TCA 8418 I2C Communication

    Linux_Arasi
    Hi.. Thank you very much for your respose Now i understood the problem is in am335x board file, Needs in include platform data definitions about the TCA8418 device. Can you suggest me how to add platform data definitions to board file, Becase i am new this beaglebone environment and i have e...
    on Aug 4, 2012

  • Forum Post: I2C comm error with PCA9518D

    Edmond Ng
    I have been using NXP's PCA9518D and I2C communication is fine. However, once i started switching to TI's PCA9518D, my I2C communication error starts going up in a 12hr test. Error ranges from lost communication to a module to no ack response. My question is; Is the TI PCA9518D a direct replacement...
    on Aug 10, 2012
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