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bq77910
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  • Forum Post: Re: BQ77910 External MOSFET for Battery Balancing

    WM5295
    The bq77910 does not have a separate control pin for an external balance transistor, the gate voltage for the external FET is developed across the Rvcx resistor. A p-channel FET example is shown in the figure (Please visit the site to view this file) N-channel circuit examples are in (Please visit the...
    on Dec 8, 2010

  • Forum Post: Re: How to configure EEPROM on BQ77910?

    WM5295
    In the bq77910 product folder, to the right of the device name is a link labeled "Alert me about changes to this product ". If you sign up there you will get a notification when various changes are made to the folder including availability. The BQ77910GUI-SW evaluation software (Please visit...
    on Jan 13, 2011

  • Forum Post: Re: BQ77PL900, BQ77910 compatibility with Lithium Iron Phosphate

    WM5295
    Either are compatible with Lithium Iron Phosphate batteries within their capabilities. The bq77PL900 would function as an AFE allowing a micro-controller to monitor voltages. It can take action for under voltage, over current and temperature which may be appropriate for the LiFePO4 cells, but would...
    on Jan 24, 2011

  • Forum Post: Re: Can we increase max discharging current based on BQ77910 design?

    WM5295
    The current thresholds are voltage based, so you can extendthe design to higher currents. The overcurrent threshold for example can be set from 25 to 500 mV. Some areas of consideration in a higher current design might include: The value and power rating of the current sense resistor FET selection...
    on Apr 19, 2011

  • Forum Post: Re: Can we increase max discharging current based on BQ77910 design?

    WM5295
    If you are working with an early engineering sample, check any errata that came with it. Some early device samples did not support the CHG output. If there are questions, please contact your local TI sales representative. If you have current devices and a part was working but stopped after testing...
    on Apr 21, 2011

  • Forum Post: Re: Electric Bike battery management

    WM5295
    The best approach may depend on your system requirements and how you want to structure your system. The bq76PL536 and bq77PL900 are really different products. The bq76PL536 is intended to work in stacked systems and communicate with a host. The host would typically make decisions on protection events...
    on Jun 20, 2011

  • Forum Post: Re: BQ77910 CHG pin no 12V output.

    WM5295
    An over-current test or event can result in large transients when the discharge FET turns off with load. Testing a product design thoroughly to be sure the protector is operated within its abs max limits during the events is advised. If the protector IC does not work after the test, some troubleshooting...
    on Jul 8, 2011

  • Wiki Page: bq77908/bq77910 wake up in fault

    WM5295
    When I connect cells to the bq77908 or bq77910, the part is in an OV or UV condition although all cells are within the OV and UV threshold values. Why can this happen? The bq77908 and bq77910 apply the more restrictive condition that the cell voltages must be within the hysteresis limits at start...
    on Jul 8, 2011

  • Forum Post: BQ77910 - technical assistance

    Ran Aloni
    Hi All, I'm in designing stage of using BQ77910. I have 2 questions: 1) in E bike application, we have the demand to control the D-FET, from outside the circuit (a key that turns, closes a switch and somhow needs to close the DSG-FET and stop all discharge. do you have a suggestion of doing that...
    on Jul 20, 2011

  • Wiki Page: bq77908/bq77910 current sense. Why is the trip not as expected?

    WM5295
    Why does the bq77908 or bq77910 current sense level and delay not match my settings? The bq77908/bq77910 responds to current by the voltage at the SENSE+/- pins. These are connected to the sense resistor, possibly through a filter network. The threshold in this description may be described as current...
    on Jul 20, 2011

  • Wiki Page: bq77908/bq77910 Cell simulation resistors

    WM5295
    What value resistors should be used for cell simulation with the bq77908 or bq77910? or Why does the device shutdown when I read registers? The bq77908/bq77910 has open cell detection which periodically loads the cell inputs to determine if a cell is present. This will limit the resistor values...
    on Jul 22, 2011

  • Wiki Page: bq77908/bq77910 temp threshold calculation

    WM5295
    How do I set the temperature threshold for the bq77908? or How do I adjust the VTSB resistor for my thermistor? It may not be apparent at first glance, but the circuit is a simple resistor divider. The device will compare the voltage from the external circuit to the fixed internal over temperature...
    on Jul 22, 2011

  • Wiki Page: bq77908/bq77910 separate charge temperature threshold

    WM5295
    Can I set a lower over-temperature threshold while charging? The bq77908 or bq77910 has a single fixed over temperature threshold. See the datasheet for features to allow the charger to share the thermistor. If the charger provides a "charger present" signal to the pack which is normally...
    on Jul 22, 2011

  • Forum Post: Re: BQ77910 CHG pin no 12V output.

    john xiao
    Hi WM5295: I have according to your requirement to do it. connect the GUI and communication interface and poll the bq77910 status,I find the status shows an over-voltage, measurement the battery voltage,It show 4.14V per cell.EEPROM set OVT is 4.225 and OV Hysteresis is 100mV.So I discharge 10 min...
    on Jul 26, 2011

  • Wiki Page: bq77908/bq77910 abs max for CCAP, DCAP?

    WM5295
    CCAP and DCAP are not in the datasheet absolute maximum table. What are the limits for these pins? Without a datasheet specification, these should be considered the same as the CHG and DSG respectively. Always check for updates and use the latest datasheet.
    on Jul 26, 2011

  • Wiki Page: bq77908/bq77910 status register

    WM5295
    Q: What are the address and bit locations for the status registers so I can check them in my board test program? The bq77908 and bq77910 status registers are not shown in the datasheet, but are shown in the GUI. While the normal operation of the part does not allow access to these, they can be helpful...
    on Jul 28, 2011

  • Wiki Page: bq77908/bq77910 communication: Can I use the EV2300?

    WM5295
    Q: Can I use the EV2300 to communicate with the bq77908 or bq77910? Not practically. The BQ77908-10-GUI-SW GUI software for the part does not support the EV2300. Evaluation software from other gas gauge or protector devices will not support the register set or bit definition of these devices. If you...
    on Jul 28, 2011

  • Forum Post: Re: BQ78PL116 SMBUS pack voltage scaling?

    Benjamin Sarpong
    Hi Modesto, The PL116 has scaling capability, but this only allows you to measure higher voltages. The scaling is explained in page 53 of the TRM ( http://focus.ti.com/lit/ug/sluu481/sluu481.pdf ) In terms of other parts, this will depend on the features you requre, but you can use the following...
    on Jul 29, 2011

  • Forum Post: BQ77910 with series FET for DSG and CHG

    Ran Aloni
    Hi all, I have 2 questions: can someone supply a more specific application note, that specify how should I use serial FET CHG and DSG? how will the bq77910 know when I'm charging (without use of external MCU), since the CHGCTL can't be connected to the CHG- anymore. are there any...
    on Aug 1, 2011

  • Wiki Page: bq77908/bq77910 cell input question

    WM5295
    Why does the bq77910 EVM have a TVS diode at D18? Do I need one in my design? Do I need clamp diodes on the inputs? Which inputs are most sensitive? The bq77908 and bq77910 have 2 absolute maximum ratings on the inputs. One is the differential voltage, the other the single ended voltage. The...
    on Aug 3, 2011

  • Forum Post: Re: BQ77910 with series FET for DSG and CHG

    WM5295
    There will likely be several application notes on the bq77910, butnothing is published yet. Figure 11 in the bq77910 datasheet provides the basic circuit. The EVM has patterns to modify the parallel board to a series circuit. Most simply, remove Q7 and install an appropriate FET (with heatsink if needed...
    on Aug 5, 2011

  • Forum Post: Re: BQ77910 with series FET for DSG and CHG

    Ran Aloni
    Thanks for the fast and detailed reply, It kind of what I have figured myself, I guess the easiest way for me will be to use a parallel connection after all :-)
    on Aug 7, 2011

  • Forum Post: Re: BQ77910 - technical assistance

    Ran Aloni
    Hi Steven, thanks for your answer, I have tried the Open Thermistor solution, as well as shorted thermistor. my problem is that it is common today to close only discharge with a key, and to be able to charge anyway (in E bikes applications...). then using the thermistor to close control the...
    on Aug 8, 2011

  • Wiki Page: bq77908/bq77910 CHGST questions

    WM5295
    What level should I provide for CHGST? If a logic level is used, 3.3V would be a good value for a high. Note that with the low minimum for V CHG_DET1 , the logic will have to provide a very good "low" level. A standard maximum high logic "low" may not be good enough. The CHGST...
    on Aug 9, 2011

  • Forum Post: unreal over current faults on the BQ77910

    Ran Aloni
    Normal 0 false false false EN-US X-NONE HE MicrosoftInternetExplorer4 ...
    on Aug 10, 2011
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