Texas Instruments BQ77216 User manual

User’s Guide
BQ77216 Evaluation Module
Willy Massoth
ABSTRACT
The BQ77216EVM evaluation module (EVM) is a complete evaluation system for the BQ77216, a 3-cell to 16-
cell Li-Ion battery protection integrated circuit. The EVM consists of a BQ77216 circuit module which is used for
simple evaluation of the BQ77216 protection function. The circuit module includes one BQ77216 integrated
circuit (IC), thermistor, and all other onboard components necessary to signal the condition from overcharge,
overdischarge, and overtemperature in a 16-series cell Li-Ion or Li-Polymer battery pack. The circuit module
connects directly across the cells in a battery, or can be connected with a power supply and the included cell
simulator resistors.
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Table of Contents
1 Features...................................................................................................................................................................................3
1.1 Kit Contents........................................................................................................................................................................3
1.2 Ordering Information.......................................................................................................................................................... 3
1.3 BQ77216 Circuit Module Performance Specification Summary.........................................................................................3
1.4 Required Equipment.......................................................................................................................................................... 3
2 BQ77216 EVM Getting Started Guide....................................................................................................................................4
2.1 Before You Begin............................................................................................................................................................... 4
2.2 Warnings and Cautions...................................................................................................................................................... 4
2.3 Quick Start..........................................................................................................................................................................4
3 BQ77216 Circuit Module Use.................................................................................................................................................6
3.1 Cell Simulator.....................................................................................................................................................................6
3.2 Reducing the Cell Count.................................................................................................................................................... 6
3.3 Connecting Cells................................................................................................................................................................ 6
3.4 Hardware Configuration..................................................................................................................................................... 7
4 BQ77216EVM Circuit Module Physical Construction..........................................................................................................8
4.1 Board Layout......................................................................................................................................................................8
4.2 Bill of Materials.................................................................................................................................................................12
4.3 Schematics.......................................................................................................................................................................13
5 Related Documents from Texas Instruments.....................................................................................................................16
6 Revision History................................................................................................................................................................... 16
List of Figures
Figure 2-1. EVM Connection for Basic Operation........................................................................................................................5
Figure 4-1. Top Silk Screen......................................................................................................................................................... 8
Figure 4-2. Top Assembly............................................................................................................................................................ 9
Figure 4-3. Top Layer...................................................................................................................................................................9
Figure 4-4. Bottom Layer........................................................................................................................................................... 10
Figure 4-5. Bottom Silk Screen..................................................................................................................................................10
Figure 4-6. Bottom Assembly.....................................................................................................................................................11
Figure 4-7. Schematic Diagram................................................................................................................................................. 14
Figure 4-8. Cell Simulator.......................................................................................................................................................... 15
List of Tables
Table 1-1. Ordering Information................................................................................................................................................... 3
Table 1-2. Performance Specification Summary..........................................................................................................................3
Table 3-1. Reducing Cell Count................................................................................................................................................... 6
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Table 4-1. BQ77216 Circuit Module Bill of Materials................................................................................................................. 12
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1 Features
• Complete evaluation system for the BQ77216 3-cell to 16-cell Li-Ion and Phosphate battery protector
• Populated circuit module for 16-cell configuration for quick setup
• Resistor cell simulator for quick setup with only a power supply
1.1 Kit Contents
• BQ77216 circuit module
1.2 Ordering Information
For complete ordering information, refer to the product folder at www.ti.com/tool/BQ77216EVM.
Table 1-1. Ordering Information
EVM Part Number Chemistry Configuration Capacity
BQ77216EVM Li-Ion 16 cells Any
Note
Capacity is shown as Any since the board does not control current as delivered. If using available
component patterns monitor board currents and temperatures to operate within the limits of the
components and laboratory environment. Refer to the physical construction section for board details.
1.3 BQ77216 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the BQ77216 circuit module in its default 16-cell
series FET configuration.
Typical voltage depends on the number of cells configured. The board does not control current. If populating
additional components limit currents to appropriate levels.
Table 1-2. Performance Specification Summary
Specification Min Typ Max Unit
Input voltage BATT+ with respect to BATT– 5 – 71 V
Continuous current 0 - 1 A
Operating temperature range 20 25 30 °C
1.4 Required Equipment
The following equipment is required to operate the BQ77216 EVM in a simple demonstration:
• DC power supply, 0–71 V at 1 A
• DC voltmeter
• Test leads to connect equipment
Additional equipment may be desired to operate the BQ77216 with a more extensive demonstration.
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2 BQ77216 EVM Getting Started Guide
2.1 Before You Begin
The following warnings and cautions are noted for the safety of anyone using or working close to the BQ77216
EVM. Observe all safety precautions.
2.2 Warnings and Cautions
Warning The BQ77216EVM is not rated as a high voltage EVM, has smaller clearances
than normally used on high voltage boards and does not have an isolation
boundary. If you apply high voltage to this board, all terminals should be
considered high voltage. Electric shock is possible when connecting the board to
live wire. The board should be handled with care by a professional. For safety, use
of isolated test equipment with overvoltage and overcurrent protection is highly
recommended.
!
Caution Do not leave the EVM powered when unattended.
CAUTION
The BQ77216 does not limit performance to the ratings of the EVM. Set equipment appropriately to
limit voltage and current for safe operation.
CAUTION
The circuit module has signal traces, components, and component leads on the bottom of the board.
This may result in exposed voltages, hot surfaces or sharp edges. Do not reach under the board
during operation.
CAUTION
The circuit module may be damaged by over temperature. To avoid damage, monitor the
temperature during evaluation and provide cooling, as needed, for your system environment. Do not
operate beyond the current and voltage limits in the Sepcification Table.
CAUTION
Some power supplies can be damaged by application of external voltages. If using more than 1
power supply, check your equipment requirements and use blocking diodes or other isolation
techniques, as needed, to prevent damage to your equipment.
CAUTION
Connections for rated current must be made at the terminal block. Test points are not rated for the
board current.
2.3 Quick Start
The BQ77216 is configured for cell count by the connections on the board. By default the board is set up for 16
cells and this quick start is for all 16 cells. When fewer cells are used, refer to Section 3 and adjust the supply
voltage appropriately.
These steps describe quick connection of the BQ77216 EVM to demonstrate operation of the protector function
the EVM. For more detailed descriptions, refer to other sections of the user guide.
Refer to Figure 2-1 for the following steps.
1. Install the cell simulator shunts.
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2. Connect a 0-V DC power supply capable of 250 mA minimum between the “BAT-” and "BAT+" terminals and
adjust to approximately 45 V.
3. Connect a meter to a VSS test point and monitor the COUT or DOUT test points, or the corresponding
signals at J4 terminals 4 or 5.
4. Observe that both the COUT (J4 pin 4) and DOUT (J4 pin 5) are low, approximately 0 V.
5. Remove the cell simulator shunt for cell 2, J6 pins 17 and 18.
6. Observe the COUT and DOUT signals are low.
7. Install the cell 2 cell simulator shunt at J6 pins 17 and 18.
8. Adjust the supply voltage to approximately 71 V. Observe the COUT transitions to approximately 7 V after 4
seconds. Confirm DOUT remains low if desired.
9. Adjust the supply voltage to approximately 31 V. Observe DOUT is approximately 7 V after 4 seconds as the
part transitions to UV mode. Observe COUT is low if desired.
10.Make other adjustments as desired for evaluation. See other sections of this user guide for details of
operation.
11.When complete with this quick start demonstration, turn off the power supply.
Refer to other sections of this user guide for additional details.
DC Power Supply
+ -
DMM
+ -
Connect as
needed for
evaluation
Figure 2-1. EVM Connection for Basic Operation
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