Power Management
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Power Management

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  • Forum Post: TPS659xx: I2C external pullup

    Gandhar Dighe
    Q: Are external pull ups necessary for I2C bus from PMIC device to OMAP? A: No. If the capacitance specification of I2C standard is followed then there is no need for external pull-up, internal pull ups are sufficient. If external pull ups are used then make sure that the internal pull ups are disabled...
    on Jan 22, 2009

  • Forum Post: Re: 20Z75 breakdown after I connect it with MSP430's SMbus

    SW5307
    Leonardo, I think most likely you have a timing issue. The best approach to me is to first thoroughly read the SMBus communication specification, which you could download from http://smbus.org/ Then to establish confidence with your communication routine, you could use an oscilloscope to monitor...
    on Sep 4, 2009

  • Forum Post: problems with i2c access to the bq27501

    Ben Wu
    I'm trying to get the software written for accessing the bq27501 chip through i2c. The datasheet information regarding the i2c interface isn't very good, however, slua467a.pdf that seems to help. The problem I'm having is that I'm not able to read the chip firmware version (or anything...
    on Nov 10, 2009

  • Forum Post: TPS65950 Problem with LED control (for turning backlight on/off)

    SabineKäß
    Hi, I'm using the OMAP3EVM and try to use the power management to control the backlight. The program has to run directly on the hardware - not within linux. I have implemented the I2C Master Transmitter Mode (polling method) as explained in figure 18-29 of the OMAP35x Application Processor...
    on Apr 19, 2010

  • Forum Post: bq77pl900

    Larry Shilkoff
    I'm trying to use the evaluation software to exercise the bq77pl900 battery protector. I haven't been able to get the chip to respond to the software. I can see the I2C signals on the comm line, and the clock and data are on the correct lines. I'm delivering ~8 vdc to pin 9 (Batt). According...
    on May 11, 2010

  • Forum Post: Re: Example I2C code for the BQ27510

    dMax
    We now have an app note with sample C code for the MSP430 to demonstrate communication with our single-cell fuel gauges (using I2C and HDQ). It also has examples for communicating with our authentication ICs (using HDQ and SDQ). You can find it in the Application Notes section of the product folders...
    on May 13, 2010

  • Forum Post: TPS65073 with OMAP3530 clarifications requested

    Bjorn Wesen
    Hi! I'm designing an OMAP3530-system which only requires a simple PMU so I think the TPS65073 would fit well. However, the design-in Wiki and the TPS6507x documentation is a bit sparse or downright ambigous on a couple of points which I thought I'd ask here: 1) If not using a battery...
    on May 18, 2010

  • Forum Post: changing bq2060A SMBus ID adress

    Stefan 50900
    Hello, is it possible to change the SMBus ID adress ? I need to use up to 5 batteriepacks, each equipped with the bq2060A, in parallel circuit and want to transfer the battery data of each battery via one SMBus to the PC. Thanks for helping! Stefan
    on May 28, 2010

  • Forum Post: Re: TPS65950 I2C Control Interface Hangs

    DavidVescovi
    Our problem was improper decoupling caps populated on our custom board. The problem showed up as intermittent I2C errors. Just on first look it looks like you have two threads compeating for the same resource (I2C bus). The MADC reading the battery voltage and the other reading the RTC time. If it...
    on Jun 5, 2010

  • Forum Post: Re: TPS65950 I2C Control Interface Hangs

    DavidVescovi
    One other note, There should be a software lock on the complete I2C "transaction" ..not just the bus access. Some transactions require multiple packets and the complete transaction should be protected or else out of sequence problems can occur. Your problem looks to be more bus related so probably...
    on Jun 7, 2010

  • Wiki Page: Sample C code available for single-cell fuel gauges and battery authentication ICs

    Antonio Fadhel
    Sample C code available for single-cell fuel gauges and battery authentication ICs by 317599 We have a new app note online (SLVA413) which has sample C code for the MSP430 platform that you can use to talk to many of our single-cell fuel gauges as well as our battery authentication ICs. It includes...
    on Jul 12, 2010

  • Forum Post: TSP65930 IIC interface to OMAP35x

    Terry Jendon
    A customer is using the TPS65930 that is interfacing with an OMAP35x processor and has some questions (see below) What is the IIC exchange between the tsp65930 and the OMAP? What does it decode to? Where does it originate? H ow it is acknowledged? Can it be overridden with hardware or...
    on Jul 30, 2010

  • Forum Post: BQ27510 - write data flash

    Victorien v
    hello, I'm developping a driver in C language to control a fuel guage BQ27510. I have no problem to read the standard/sub/extend command and to write the standard command. but I can't write data on "data flash" with the extend command. the function is this one : if(!(FuelGauge_WriteExtendedCmd...
    on Aug 3, 2010

  • Forum Post: Re: Interfacing BQ77pl900 with MSP430f1611

    WM5295
    From a hardware perspective there are a number of things to check, likely with a scope: Is the bq77PL900 awake, out of reset and have FETs on so there is a non-zero status to read? Is VLOG supplied? When the code is run, do the I2C lines toggle at the VLOG level, or at all? Is the resulting...
    on Sep 2, 2010

  • Forum Post: Generate keypress interrupt through software

    Mark P55787
    I have been working on prototyping some functionality using the TPS65950 and the OMAP3530 with the TWL4030_keypad driver. I can open the /dev/eventx file that is created after loading the driver and get driver information as follows: # dmesg | grep input input: TWL4030 Keypad as /devices/platform...
    on Sep 3, 2010

  • Forum Post: Re: BQ27541 hanging the I2C bus

    Ming Yu
    Shaheen, What is the hardware die rev on these bq27541 devices? you can send command 0x0003 and read back from control register the HW version What is the host I2C speed? The difference between bq27541-V200 and bq27541 is firmware upgrade and the change list should be on the website. ...
    on Nov 16, 2010

  • Forum Post: Will the bq77PL900 talk over I2C with an MSP430F2272?

    Scott Brenneman
    I don't have hardware yet, so I can't try this out, but reading the datasheets I see an apparent incompatibility between the bq77PL900 and the MSP430 in the area of the I2C interface. The bq77PL900 says that it doesn't send ACKs, but the MSP430 appears to require them and reacts when it doesn't...
    on Dec 10, 2010

  • Forum Post: BQ27541 I2C Question

    Bill Zimmermann
    The BQ27541 datasheet recommends 10K for the pullup resistors for the I2C clock & data pins. In the timing specifications for the I2C bus, the max risetime spec is 300 nS. With 10K pullups, in my application the rise time is around 4 uSec. How important is it to meet the risetime specification (assuming...
    on Feb 14, 2011

  • Forum Post: Re: TPS65070 CON_CTRL1 Parameter Setting

    Daniel Acevedo
    What are you trying to achieve by programming through I2C? If start-up sequencing, I recommend using one of the TPS6507xx variants which provide preprogrammed internal sequencing to power up the processor. Once the processor is powered up, it can issue I2C commands to the TPS6507xx.
    on Mar 3, 2011

  • Forum Post: BQ24765 - Not responding on SMbus - No acknowledgment When trying to read using SMbus

    Rizwan Hirani
    Hi There, This is regarding BQ24765 battery charger IC. In one of our custom design we are using BQ24765 as batterty charger to charge 14.4V Li ION battery. It is observed that , battery tries to send commands to battery charger IC @ the adress b'0001 001_ , but there is no acknowledged. ...
    on Mar 14, 2011

  • Forum Post: BQ2415X - Exiting Hi Z Mode

    Tyler Pate
    Q: Once the device (BQ24153A, BQ24156A, BQ24158) exits the standard path on the operational flow chart (pg. 15 in datasheet) and enters the high impedance mode, how does one return the device to normal operation?
    on Mar 22, 2011

  • Wiki Page: BQ2415X - Exiting Hi Z Mode

    Tyler Pate
    Q: BQ2415X - Exiting Hi Z Mode Q: Once the device (BQ24153A, BQ24156A, BQ24158) exits the standard path on the operational flow chart (pg. 15 in datasheet) and enters the high impedance mode, how does one return the device to normal operation? A: You must perform an I2C write or power cycle the...
    on Mar 22, 2011

  • Forum Post: BQ2415X: Application & Removal of VBUS, effect on IC State

    Tyler Pate
    Q: What happens if VBUS is applied, then removed and VSCOUT is at first above the VLOWV but then drains below it? If I then reapply VBUS, will it start charging or will it stay in Hi Z mode?
    on Mar 22, 2011

  • Wiki Page: BQ2415X: Application & Removal of VBUS, effect on IC State

    Tyler Pate
    Q: BQ2415X: Application & Removal of VBUS, effect on IC State Q: What happens if VBUS is applied, then removed and VSCOUT is at first above the VLOWV but then drains below it? If I then reapply VBUS, will it start charging or will it stay in Hi Z mode? A The IC will not enter the battery...
    on Mar 22, 2011

  • Forum Post: Re: TPS65950 I2C Control Interface Hangs

    Gil Zhaiek
    Hi All, I was wondering how this problem was fixed? We are using same OMAP 343x and same TPS65950 and our i2c hangs too. We develop in Android Linux platform. Basically, this problem occurs rarely. I have a while loop that does a register dump for all of the devices on the I2C bus, and...
    on Apr 7, 2011
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