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Texas Instruments bq76920EVM User Manual Download Page 45

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Revision History

45

SLVU924D – March 2014 – Revised November 2018

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Copyright © 2014–2018, Texas Instruments Incorporated

Revision History

•

Added paragraph and figure to

Connecting Cells

section.

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24

•

Changed

Connecting to a Host

section paragraph and added figure.

............................................................

25

•

Added spark gap paragraph.

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28

•

Added spark gaps, changed fiducials to uninstalled, and bq78350 version in the BOM table.

...............................

37

•

Changed gauge documents to -R1 and added references in related documents.

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43

Summary of Contents for bq76920EVM

Page 1: ...face GUI software the user can view the device registers adjust protection limits and enable FET control outputs Contents 1 Features 3 1 1 Kit Contents 3 1 2 Ordering Information 3 1 3 bq76920 Circuit...

Page 2: ...istry View 19 14 Calibration View 20 15 Example Voltage Calibration Successful 20 16 Advanced Comm SMB View 21 17 Simulating Current Setup 22 18 Example 3 Cell Simple Evaluation Configuration 23 19 Ex...

Page 3: ...ttery construction Refer to the physical construction section for board details 1 3 bq76920 Circuit Module Performance Specification Summary This section summarizes the performance specifications of t...

Page 4: ...ture To avoid damage monitor the temperature during evaluation and provide cooling as needed for your system environment CAUTION Some power supplies can be damaged by application of external voltages...

Page 5: ...C power supply capable of 250 mA minimum to the BATT terminals and adjust to approximately 18 V The illuminated LED indicates the cell simulator resistor divider is powered 9 Press and release the BOO...

Page 6: ...BOOT switch 12 Start the bqStudio software The EVM has shipped with different versions of the bq78350 firmware Observe the windows which display as the software starts If a Register View window appear...

Page 7: ...ears next to the button 21 Measure the voltage of the BATT terminals Divide the value by the number of cells and enter the value in mV in the Ext Average Cell Voltage box Click on the Calibrate Voltag...

Page 8: ...for the EVM This software is used when evaluating the AFE alone without the gauge For evaluation with the bq78350 gauge refer to Section 5 The bq76940 bq76930 bq76920 software supports the bq76920 AFE...

Page 9: ...n window appears as shown in Figure 3 The bq76940 bq76930 bq76920 software uses popup help tips on many of the control features Figure 3 bq76940 bq76930 bq76920 Evaluation Software Display The softwar...

Page 10: ...If the AFE on the EVM has been changed to a different address the address must be entered The value is the 7 bit address and is shifted left 1 bit position when observed on the bus The byte communica...

Page 11: ...ments bq76940 Load configuration This button allows loading the control register values from a file A pop up box allows selection of the file another pop up box lets you select whether to write the va...

Page 12: ...Figure 6 illustrates the Sequence view of the GUI This is useful to send timed sequences of register reads or writes to the device It can be selected using the SEQUENCE button on the left side of the...

Page 13: ...start section Connect the EVM and related equipment Power the EVM Boot the EVM Start the software Read and change registers as desired If the board is powered off during the evaluation process Power...

Page 14: ...of the bq78350 for evaluation bqStudio will not communicate with the AFE and the I2C connector of the EVM should not be connected while using bqStudio Although the software runs without connection to...

Page 15: ...me view can be opened from the menu selection Help Welcome bqStudio contains a user guide for general operation of the software Refer to the menu selection Help Help Contents for information Once the...

Page 16: ...the device rather than a version input from the Target Selection Wizard An example of the dashboard display is shown in Figure 10 If the version read by the autodetect is the same as the version previ...

Page 17: ...electing the bit in the pop up when the register or its value is selected Figure 12 shows the bit field for the AFE Cell Map which is one of the most basic settings that must typically be changed with...

Page 18: ...y View The bq78350 uses the chemistry of the cells to estimate the state of charge of the pack after a reset Chemistry information is not loaded to the device as a Data Memory parameter but by using t...

Page 19: ...is voltage must be calibrated Measure the battery voltage calculate the average cell value and enter the value in the box Clicking the Calibrate Voltage button runs the calibration Values left blank o...

Page 20: ...om 20 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright 2014 2018 Texas Instruments Incorporated bq76920 Evaluation Module User s Guide Figure 14 Calibration View Figur...

Page 21: ...he bq76920 IC and related circuitry to demonstrate the features of the IC Surface mount FETs are provided for the high current path A thermistor provides temperature sensing on the board Other compone...

Page 22: ...17 Simulating Current Setup The power supply technique can also be used with the bq78350 to provide current for calibration or to show current flow However the simulated current will not provide good...

Page 23: ...will shut down the AFE and require re boot of the board To avoid shutdown simulate a charge current until the cell count configuration can be corrected Figure 18 Example 3 Cell Simple Evaluation Confi...

Page 24: ...ons to remove the load Cell connection is generally considered safest from the bottom up This minimizes the step size of the voltage applied to the board Recommended connection sequence for the EVM wh...

Page 25: ...ing C0 on the board by closing the C0 dip switch during cell connection can reduce stress on the VC0 input of the AFE Open the switch after cell connection for sensing at the cell 6 5 Connecting to a...

Page 26: ...be useful for evaluation Test points are not typically populated The patterns may be used as probe points or wires or test points could be soldered to provide probing if desired Normally the power fi...

Page 27: ...mount a higher current diode or other transient suppression component HS1 is a position to mount a suitable heatsink if needed Other heatsink options may be available in the evaluation environment R34...

Page 28: ...t terminals through banana jacks Control connections are on the left top Pack terminals are on the right side using banana jacks Wide trace areas are used reducing voltage drops on the high current pa...

Page 29: ...cuit Module Physical Construction 29 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright 2014 2018 Texas Instruments Incorporated bq76920 Evaluation Module User s Guide F...

Page 30: ...le Physical Construction www ti com 30 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright 2014 2018 Texas Instruments Incorporated bq76920 Evaluation Module User s Guide...

Page 31: ...Circuit Module Physical Construction 31 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright 2014 2018 Texas Instruments Incorporated bq76920 Evaluation Module User s Guid...

Page 32: ...dule Physical Construction www ti com 32 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright 2014 2018 Texas Instruments Incorporated bq76920 Evaluation Module User s Gui...

Page 33: ...Circuit Module Physical Construction 33 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright 2014 2018 Texas Instruments Incorporated bq76920 Evaluation Module User s Gui...

Page 34: ...le Physical Construction www ti com 34 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright 2014 2018 Texas Instruments Incorporated bq76920 Evaluation Module User s Guide...

Page 35: ...uit Module Physical Construction 35 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright 2014 2018 Texas Instruments Incorporated bq76920 Evaluation Module User s Guide Fi...

Page 36: ...Physical Construction www ti com 36 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright 2014 2018 Texas Instruments Incorporated bq76920 Evaluation Module User s Guide F...

Page 37: ...8x0 8mm LTST C190KFKT Lite On H1 H2 H5 H6 4 Machine Screw Round 4 40 x 1 4 Nylon Philips panhead Screw NY PMS 440 0025 PH B F Fastener Supply H3 H4 H7 H8 4 Standoff Hex 0 5 L 4 40 Nylon Standoff 1902C...

Page 38: ...ch SPST 7Pos Rocker TH 9 65X8X19 8mm 76SB07ST Grayhill SH J4 SH J5 SH J9 SH J10 SH J12 3 SH J12 5 SH J12 7 SH J12 9 SH J13 3 9 1x2 Shunt 100mil Gold plated Black Shunt 969102 0000 DA 3M SNT 100 BK G S...

Page 39: ...e Bill of Materials continued Designator Qty Value Description Package Reference Part Number MFG Alternate Part Number Alternate MFG TP1 0 Black Test Point TH Multipurpose Black Keystone5011 5011 Keys...

Page 40: ...1 F C17 0 1 F C18 1 F C14 0 R16 1 00k R17 1 00Meg R18 50V Q3 BSS84W 7 F 16V D5 MMSZ5246B 7 F DNP 1 25V D4 GND 10 0k t R20 4700pF C15 GND GND TP9 DNP TP11 DNP TP13 DNP TP14 DNP TP7 DNP TP18 DNP TP24 D...

Page 41: ...LT 16 17 Addr select GG_PWR GG_SCL GG_SDA GG_ALERT GG_ KEYIN GG_ PRES SMBA 16V D13 MMSZ5246B 7 F 5 6V D11 5 6V D10 5 6V D20 5 6V D19 TP37 TP33 DNP KEYIN PRES 1 2 3 4 5 6 7 8 9 10 J12 PEC05DAAN GND GG_...

Page 42: ...15 DNP BATT Test points BATT C5 C4 C3 C2 C1 C0 1 00k R64 bq76920EVM Circuit Module Physical Construction www ti com 42 SLVU924D March 2014 Revised November 2018 Submit Documentation Feedback Copyright...

Page 43: ...rom Original March 2014 to A Revision Page Changed EVM Connection for Basic Gauge Operation image 7 Changed software display image 9 Changed registers view image 10 Revision History Changes from A Rev...

Page 44: ...nd added clarification in first paragraph 8 Added Interface Adapter section with bq769x0 specific instructions 8 Added Battery Management Studio Software section 13 Added sentence to end of Evaluating...

Page 45: ...rporated Revision History Added paragraph and figure to Connecting Cells section 24 Changed Connecting to a Host section paragraph and added figure 25 Added spark gap paragraph 28 Added spark gaps cha...

Page 46: ...e resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reprod...

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