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Using BQ20z80

rohit devmore
Intellectual 635 points
Other Parts Discussed in Thread: BQ20Z80

M using EVM BQ20z80

1)and going to do chemistry cycling, as in datasheet they have told to connect vout of I2c or HDq to load.

will it be fine if i connect external power supply

 

2)is it compulsory to do cycling for continuous 24 hrs.

 

thanx and regards

rohit

 

  • 0
    TI__Expert 6470 points

    1. The load will need to be switched off and on by the program, which uses the VOUT pin. So, you will need to use a relay or FET as shown in the schematic in bqEasy. Click on the schematic to see more detail. An external power supply is not needed, unless such a device is used to sink current instead of a C/5 resistor.

    2. Chemistry "Learning" in section 4 of bqEasy can take 24 hours or more to "learn" your chemistry. Chemistry "Cycling" in section 5 will not take that long.

     

  • 0 in reply to Doug Williams4811
    Intellectual 635 points

    Thanks,

     

    See what i am doing is,for chemistry selection is

    1) battery charged to full.

    2) load connected to pack + and PACK-, and SMBUS is conneted to evm, and instead of VOUT through I2c m givin 5 v suppl externally to gate of mosfet, as vout pin of I2c of EV2300 IS SUPPLYING 5 V. m DOING THIS BECOZ, my Vout pin of HDQ or I2C is not showing any voltage when USB connected and checked with DMM.

    is it gonna work?

     

    another question,

    u said load is to be switched of by program,

    how is that m not connecting Vout of I2c, its external 5V.

    please reply

     

    thanks and regards

    rohit

  • 0 in reply to Doug Williams4811
    Intellectual 635 points

    During chemistry selection cycling, when they say relax for two hours,

    i just remove the load at pack+, pack-

    and SMBUS is cpnnected and cell are at 1N and 4P, relaxing

     

    m confused about the procedure of cycling, although i have read all the related document with the application book

    pls help.

     

    Thanks and regards,

    rohit

  • 0
    TI__Expert 6470 points

    Rohit,

    You must use the VOUT pin to control your load. Otherwise, it definitely will not work.

  • 0 in reply to Doug Williams4811
    Intellectual 635 points

    sir, 

    when i connect the USB to PC, the output at EV2300 i.e. the vout pin of I2C or DOESnot show any voltage,  only VCC shows the 3.3v output ,  i.e. why i connected the external 5V supply,

     

    During chemistry learning,  SMBUS is to be keep connected,  and load is through Vout pin of I2C,   this is the procedure,   isn`t it?

     

    but my Vout at I2c do not give any output,  any alternative or option??

     

    please tell the set up in detail if possible

     

    thanks and regards

    rohit