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cell simulator on tida-00255

Calino Perez
Intellectual 550 points
Other Parts Discussed in Thread: TIDA-00255, BQ78350

Hi,

"The board includes a resistive cell simulator selected with S3 and S4. The cell simulator is used where appropriate with external test equipment to provide clear demonstration of the operation. The cell simulator is a test convenience on the evaluation board and should not be considered part of a system design. It would normally be provided in a test fixture when desired. Inclusion of a cell simulator on a system board will cause discharge of the system cells."

tida-00255 15 cell monitor/protector schematic includes a sheet PWR254_sim. Is the "resistive cell simulator" a device used to generate arbitrary by ways somehow analogous of and adjustable voltage source, and adjustable resistor, for testing the bq769x0 and bq78350 basic functions?

Calino

  • 0
    TI__Intellectual 2065 points

    Cell simulators are just the resistors (string between BAT+ and -) to provide basic testing of the bq769x0. Ref Users guide for a sch.

    Here is a extract from Usersguide sec6.1: "

    Cell Simulator
    The EVM includes a resistive cell simulator made up of 200 ohm series resistors. The top section of the
    switch S3 connects the BATT+ node to the top of the resistor string. The bottom of the resistor string is
    connected to BATT-. The individual cell taps are connected to the cell monitor signals by other sections of
    the dip switch. When operating with a power supply all switch sections should be closed. When operating
    with cells, all the dip switch sections should be open to prevent loading the cells and discharging the
    battery. The cell simulator resistors are located on the bottom of the board. These may become warm
    during operation. The orange LED near the dip switch indicates the cell simulator has power.
    26"