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bq77908
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  • 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

  • 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

  • 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

  • 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

  • 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

  • Wiki Page: bq77910 reset: How can I recover from a permanent fail?

    WM5295
    My design has SHTDIS=1, the bq77910 wakes up during cell connection and has set the open cell fault before I get all cells connected. The datasheet indicates this is a permanent failure. How can I prevent this and recover from it? How can I reset the bq77910? One solution to the open cell fault...
    on Aug 11, 2011

  • Wiki Page: bq77908/bq77910 unexpected shutdown or FETs cycle questions

    WM5295
    Why does the DSG output turn off when I connect a load to the battery - the current pulse does not exceed the short circuit limit? Why does the DSG FET cycle on a short circuit event? Why does the bq77908 shut down when my microcontroller does "X"? A probable cause for these situations...
    on Aug 11, 2011

  • Forum Post: bq77908 High side P-FET drive

    Kohei Sasaki
    I saw the "bq34z100 Overview.ppt". In this material, bq77908 drives high side P-FETs. Is this a mistake? My customer want to use high side P-FETs. Does the combination circuit of N-FET and P-FET make it possible? If you have reference circuit schematic, please give me. (Please visit...
    on Sep 5, 2012

  • Forum Post: bq77908 Connection Problem with USB-to-GPIO Adapter

    Konstantin Nickel
    Hi guys, I have some trouble connecting the bq77908 with the USB-to-GPIO Adapter to my computer (Firmware on Adapter: V2.0.19). Everytime I try to get a connection with the Evaluation or Programming Software an error message shows up and says it can't find the chip. Thereby the CHGST Signal is...
    on Jun 5, 2013

  • Forum Post: RE: bq77908 Connection Problem with USB-to-GPIO Adapter

    Konstantin Nickel
    Ok first of all thanks for the input. I am using a self developed board but there is only a 100ohm resistor in line and a 10k pulldown between the ZD GPIO output and the ZEDE input of the chip. As I measured now the ZEDE voltage as the adapter and the chip were connected and "Find Target"...
    on Jun 7, 2013

  • Forum Post: RE: bq77908 Connection Problem with USB-to-GPIO Adapter

    Konstantin Nickel
    Ok I made now the different measurements. Unfortunately I don't have a TI EVM to compare these but my board has the same interface construction, it is completly transfered from page 30 of the sluu854 which I am using later to describe devices. First of all at the GPIO adapter output without any...
    on Jun 11, 2013

  • Forum Post: RE: bq77908 Connection Problem with USB-to-GPIO Adapter

    Konstantin Nickel
    Ok thanks for all your input so far. I gained connection now, there was a bad diode left on the SCLK which pulled it low. Last question I have is if the ZEDE can be pulled high all the time at programming the EEPROM later. The problem I have is that the 2V out of the USB-to-GPIO are too less to activate...
    on Jun 13, 2013

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