Texas Instruments bq40z80EVM User manual

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User's Guide
SLUUBZ5–November 2018
bq40z80EVM Li-Ion Battery Pack Manager Evaluation
Module
This evaluation module (EVM) is a complete evaluation system for the bq40z80 battery management
system. The EVM includes one bq40z80, two bq771807 secondary protectors, and a link to Microsoft®
Windows®based PC software. The circuit module includes one bq40z80 integrated circuit (IC), two
bq771807 secondary protectors, and all other onboard components necessary to monitor and predict
capacity, perform cell balancing, monitor critical parameters, protect the cells from overcharge, over-
discharge, short-circuit, and overcurrent in 2-, 3-, 4-, 5-, 6-, or 7-series cell Li-ion or Li-polymer battery
packs. The circuit module connects directly across the cells in a battery. The bq40z80EVM can use the
on-board EV2400 or an external EV2400 interface board and software to read the bq40z80 data registers,
program the chipset for different pack configurations, log cycling data for further evaluation, and evaluate
the overall functionality of the solution under different charge and discharge conditions.
Contents
1 Features....................................................................................................................... 2
1.1 Kit Contents.......................................................................................................... 2
1.2 Ordering Information ............................................................................................... 2
1.3 Documentation ...................................................................................................... 2
1.4 bq40z80 and bq771807 Circuit Module Performance Specification Summary............................. 2
2 bq40z80EVM Quick Start Guide........................................................................................... 3
2.1 Items Needed for EVM Setup and Evaluation .................................................................. 3
2.2 Software Installation................................................................................................ 3
2.3 EVM Connections................................................................................................... 4
2.4 Update Firmware.................................................................................................... 5
3 Battery Management Studio................................................................................................ 6
3.1 Registers Screen.................................................................................................... 6
3.2 Setting Programmable bq40z80 Options ........................................................................ 7
3.3 Calibration Screen.................................................................................................. 8
3.4 Chemistry Screen ................................................................................................. 10
3.5 Firmware Screen .................................................................................................. 11
3.6 Advanced Comm SMB Screen.................................................................................. 12
4 bq40z80EVM Circuit Module Schematic................................................................................ 14
4.1 Pre-Charge......................................................................................................... 15
4.2 Pre-Discharge...................................................................................................... 15
4.3 LED Control........................................................................................................ 15
4.4 Emergency Shutdown ............................................................................................ 15
4.5 Testing Fuse-Blowing Circuit .................................................................................... 15
5 Circuit Module Physical Layouts ......................................................................................... 16
5.1 Board Layout....................................................................................................... 16
5.2 bq40z80 RevBSchematic ........................................................................................ 22
6 bq40z80EVM Bill of Materials ............................................................................................ 24
7 Related Documentation from Texas Instruments ...................................................................... 28
List of Figures
1 bq40z80 Circuit Module Connection to Cells and System Load or Charger......................................... 4
2 Registers Screen ............................................................................................................ 6
3 Data Memory Screen........................................................................................................ 7

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4 Calibration Screen........................................................................................................... 8
5 Chemistry Screen .......................................................................................................... 10
6 Firmware Screen........................................................................................................... 11
7 Advanced Comm Screen.................................................................................................. 12
8 bq40z80EVM RevB Top Composite..................................................................................... 16
9 bq40z80EVM RevB Bottom Composite................................................................................. 17
10 bq40z80EVM RevB Top Layer........................................................................................... 18
11 bq40z80EVM RevB Internal Layer 2 - GND............................................................................ 19
12 bq40z80EVM RevB Internal Layer 3 - Signal .......................................................................... 20
13 bq40z80EVM RevB Bottom Layer ....................................................................................... 21
Trademarks
Impedance Track is a trademark of Texas Instruments.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.
1 Features
• Complete evaluation system for the bq40z80EVM Li-Ion Battery Pack Manager Evaluation Module and
bq771807 independent overvoltage protection ICs
• Populated circuit module for quick setup
• Jumpers for configuring multifunction pins
• Software that allows data logging for system analysis
1.1 Kit Contents
• bq40z80 and bq771807 circuit module
• Cable to connect the EVM to a PC using the on-board EV2400. If an external EV2400 is used, it can
be purchased separately.
1.2 Ordering Information
For complete ordering information, see the product page at www.ti.com.
Table 1. Ordering Information
EVM PART NUMBER CHEMISTRY CONFIGURATION CAPACITY
bq40z80EVM Li-ion 1-, 2-, 3-, 4-, 5-, 6-, or 7-cell Any
1.3 Documentation
See the device data sheets for bq40z80 and bq771807 and technical reference manuals (TRMs) on
www.ti.com for information on device firmware and hardware.
1.4 bq40z80 and bq771807 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq40z80 and bq881707 EVM.
Table 2. Performance Specification Summary
Specification Minimum Typical Maximum Units
Input voltage Pack+ to Pack– 3 15 32 V
Charge and discharge current 0 2 7 A

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2 bq40z80EVM Quick Start Guide
This section provides the step-by-step procedures required to use a new EVM and configure it for
operation in a laboratory environment.
2.1 Items Needed for EVM Setup and Evaluation
• bq40z80 and bq771807 circuit module
• EV2400 communications interface adapter or use on-board EV2400 function
• Cable to connect the EVM to an EV2400 communications interface adapter OR micro-USB cable to
connect EVM directly to a computer
• If using an external EV2400 communications adapter, it requires a USB cable to connect the
communications interface adapter (EV2400 or on-EVM) to the computer
• Computer setup with Windows XP, or higher, operating system
• Access to the Internet to download the Battery Management Studio software setup program
• One-to-seven battery cells or 1-kΩresistors to configure a cell simulator
• A DC power supply that can supply 32 V and 2 A (constant current and constant voltage capability is
desirable). 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.
2.2 Software Installation
Find the latest software version in the bq40z80 tool folder on www.ti.com. Version 1.3.83 or greater is
required to use all the bq40z80 features. Use the following steps to install the bq40z80 Battery
Management Studio software:
1. Download and run the Battery Management Studio setup program from the Development Tools section
of the bq40z80EVM product folder on www.ti.com. See Section 3 for detailed information on using the
tools in the Battery Management Studio.
2. If the communications interface adapter was not previously installed, after the Battery Management
Studio installation, a TI USB driver installer pops up. Click “Yes” for the agreement message and follow
its instructions.
3. Plug the EVM into a USB port using the USB cable. The Windows system may show a prompt that
new hardware has been found. When asked, "Can Windows connect to Windows Update to search for
software?", select "No, not this time", and click "Next". In the next dialog window, it indicates "This
wizard helps you install software for: TI USB Firmware Updater". Select "Install the software
automatically (Recommended)" and click "Next". It is common for the next screen to be the Confirm
File Replace screen. Click "No" to continue. If this screen does not appear, then go to the next step.
After Windows indicates that the installation was finished, a similar dialog window pops up to install the
second driver. Proceed with the same installation preference as the first one.

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2.3 EVM Connections
This section covers the hardware connections for the EVM. See Figure 1.
Figure 1. bq40z80 Circuit Module Connection to Cells and System Load or Charger
• Direct connection to the cells: 1N (BAT–), 1P, 2P, 3P, 4P, 5P, 6P, 7P (BAT+)
Attach the cells to the J12 terminal block. A specific cell connection sequence is not required; although,
it is good practice to start with lowest cell in the stack (cell 1), then attach cells 2 through 7 in
sequence. The U1 and U2 devices should not be damaged by other cell connection sequences, but
there is a possibility that the bq771807 could blow the fuse. Attaching cells starting with cell 1 should
eliminate this risk. A short should be placed across unused voltage sense inputs up to 7P.
Table 3. Cell Connection Configuration
Number of
Cells J12 Terminal Block Connections
1N 1P 2P 3P 4P 5P 6P 7P
1⊕-cell1+ ⊕short ⊕short ⊕short ⊕short ⊕short ⊕short ⊕
2⊕-cell1+ ⊕-cell2+ ⊕short ⊕short ⊕short ⊕short ⊕short ⊕
3⊕-cell1+ ⊕-cell2+ ⊕-cell3+ ⊕short ⊕short ⊕short ⊕short ⊕
4⊕-cell1+ ⊕-cell2+ ⊕-cell3+ ⊕-cell4+ ⊕short ⊕short ⊕short ⊕
5⊕-cell1+ ⊕-cell2+ ⊕-cell3+ ⊕-cell4+ ⊕-cell5+ ⊕short ⊕short ⊕
6⊕-cell1+ ⊕-cell2+ ⊕-cell3+ ⊕-cell4+ ⊕-cell5+ ⊕-cell6+ ⊕short ⊕
7⊕-cell1+ ⊕-cell2+ ⊕-cell3+ ⊕-cell4+ ⊕-cell5+ ⊕-cell6+ ⊕-
cell7+ ⊕

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A resistor cell simulator can be used instead of battery cells. Connect a resistor between each of the
contacts on the J12 connector. For example, from 1N to 1P, from 1P to 2P, and so forth, until the
desired number of cells has been achieved. A power supply can provide power to the cell simulator.
Set the power supply to the desired cell voltage × the number of cells and attach the ground wire to 1N
and the positive wire to 4P. For example, for a 6S configuration with a 3.6-V cell voltage, set the power
supply to 6 × 3.6 = 21.6 V.
• Serial communications port (SMBC, SMBD)
If the external EV2400 is used, attach the communications interface adapter cable to J19 and to the
SMB port on the EV2400. The jumper settings for J18 should be to connect pins 2 and 3, and the
jumper settings for J should be to connect pins 1 and 2. This allows the external EV2400 to talk to the
bq40z80 over SMBus.
Alternately, the on-board EV2400 can be used by connecting a micro-USB cable to the EVM at J
directly to a computer. To use the on-board EV2400, the jumper settings for J18 should be to connect
pins 1 and 2, and the jumper settings for J should be to connect pins 2 and 3. This allows the on-board
EV2400 to talk to the bq40z80 over SMBus.
• System load and charger connections across PACK+ and PACK–
Attach the load or power supply to the J terminal block. The positive load or power supply wire should
be connected to at least one of the first two terminal block positions labeled PACK+. The ground wire
for the load or power supply should be connected to the last terminal block positions labeled PACK–.
• System-present pin (SYS PRES)
To start charge or discharge test, connect the SYS PRES position on the J terminal block to PACK–.
The SYS PRES can be left open if the non-removable (NR) bit is set to 1 in the Pack Configuration A
register. To test sleep mode, disconnect the SYS PRES pin.
• Wake-up the device up from shutdown (WAKE)
Press the Wake pushbutton switch (S1) to temporarily connect Bat+ to Pack+. This applies voltage to
the PACK pin on the bq40z80 to power-up the regulators and start the initialization sequence.
• Parameter setup
The default data flash settings configure the device for 7-series Li-Ion cells. The user should change
the | Data Flash | Settings | DA Configuration register to set up the number of series cells to match the
physical pack configuration. This provides basic functionality to the setup. Other data flash parameters
should also be updated to fine tune the gauge to the pack. See the bq40z80 TRM for help with setting
the parameters.
2.4 Update Firmware
The bq40z80 may need updated firmware. Contact TI support if the device is pre-release, or find the latest
firmware version in the appropriate bq40z80 folder on www.ti.com. Use the following steps to install the
bq40z80 Battery Management Studio software:
1. Run Battery Management Studio from the Start |Programs |Texas Instruments |Battery
Management Studio menu sequence, or the Battery Management Studio shortcut.
2. Follow the directions in Section 3.5, select the firmware .srec file downloaded from www.ti.com, and
click the Program button.
3. Once programming is finished, the EVM is ready to use with the latest firmware.

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3 Battery Management Studio
3.1 Registers Screen
Run Battery Management Studio from the Start | Programs | Texas Instruments | Battery Management
Studio menu sequence, or the Battery Management Studio shortcut. The Registers screen (see Figure 2)
appears. The Registers section contains parameters used to monitor gauging. The Bit Registers section
provides bit level picture of status and fault registers. A green flag indicates that the bit is 0 (low state) and
a red flag indicates that the bit is 1 (high state). Data begins to appear once the Refresh (single-time scan)
button is selected, or it scans continuously if the Scan button is selected.
Figure 2. Registers Screen
The Battery Management Studio program provides a logging function which logs the values that are
selected by the Log check boxes located beside each parameter in the Register section. To enable this
function, select the Log button; this causes the Scan button to be selected. When logging is stopped, the
Scan button is still selected and has to be manually deselected.
The Log Interval can be set by opening a Watch tab, and using the pull-down at the far right to select the
desired Log Interval in milli-seconds.

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3.2 Setting Programmable bq40z80 Options
The bq40z80 data memory comes configured per the default settings detailed in the bq40z80 TRM.
Ensure that the settings are correctly changed to match the pack and application for the solution being
evaluated.
NOTE: The correct setting of these options is essential to get the best performance. The settings
can be configured using the Data Memory screen (see Figure 3).
Figure 3. Data Memory Screen

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3.3 Calibration Screen
The voltages, temperatures, and currents should be calibrated to provide good gauging performance.
Press the Calibration button to select the Advanced Calibration window. See Figure 4.
Figure 4. Calibration Screen
3.3.1 Voltage Calibration
• Measure the voltage from 1P to 1N (VSS) and enter this value in the Applied Cell 1 Voltage field and
select the Calibrate Voltage box.
• Measure the voltage from 6P to 1N (VSS) and enter this value in the Applied Battery Voltage field and
select the Calibrate Battery Voltage box.
• Measure the voltage from Pack+ to Pack– and enter this value in the Applied Pack Voltage field and
select the Calibrate Pack Voltage box. If the voltage is not present, then turn the charge and discharge
FETs on by entering a 0x0022 command in the Manufacturer Access register on the Register screen.
• If the device is configured for 7S, measure the voltage from 7P to 1N (VSS) and enter this value in the
Applied Cell-7 Positive Terminal Voltage field and select the Calibrate Battery Voltage box.
• Press the Calibrate Gas Gauge button to calibrate the voltage measurement system.
• Deselect the Calibrate Voltage boxes after voltage calibration has completed.
3.3.2 Temperature Calibration
• Enter the room temperature in each of the Applied Temperature fields and select the Calibrate box for
each thermistor to be calibrated. The temperature values must be entered in degrees Celsius.
• Press the Calibrate Gas Gauge button to calibrate the temperature measurement system.
• Deselect the Calibrate boxes after temperature calibration has completed.

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3.3.3 Current Calibration
The Board Offset calibration option is not offered in Battery Management Studio, because it is not required
when using the bq40z80EVM. The Board Offset calibration option is available in bqProduction.
• Connect and measure a 2-A current source from 1N (–) and Pack– (+) to calibrate without using the
FETs. (TI does not recommend calibration using the FETs.)
• Enter –2000 in the Applied Current field and select the Calibrate Current box.
• Press the Calibrate Gas Gauge button to calibrate.
• Deselect the Calibrate Current box after current calibration has completed.
NOTE: Current can also be calibrated using the FETs. Measure the current in the discharge path
and enter this value in the Applied Current field.

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3.4 Chemistry Screen
The chemistry file contains parameters that the simulations use to model the cell and its operating profile.
It is critical to program a Chemistry ID that matches the cell into the device. Some of these parameters
can be viewed in the Data Flash section of the Battery Management Studio.
Press the Chemistry button to select the Chemistry window.
Figure 5. Chemistry Screen
• The table can be sorted by clicking the desired column. for example: Click the Chemistry ID column
header.
• Select the ChemID that matches your cell from the table (see Figure 5).
• Press the Update Chemistry in the Data Flash button to update the chemistry in the device.

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3.5 Firmware Screen
Press the Firmware button to select the Firmware Update window. This window allows the user to export
and import the device firmware.
Figure 6. Firmware Screen
3.5.1 Programming the Flash Memory
The upper section of the Firmware screen is used to initialize the device by loading the default .srec into
the flash memory (see Figure 6).
• Search for the .srec file using the Browse button.
• Select the Execute after programming box to automatically return the device to Normal mode after
programming has completed.
• Press the Program button and wait for the download to complete.
3.5.2 Exporting the Flash Memory
The lower section of the Firmware screen is used to export all of the flash memory from the device (see
Figure 6).
• Press the Browse button and enter an .srec filename.
• Press the Read Srec to save the flash memory contents to the file. Wait for the download to complete.

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3.6 Advanced Comm SMB Screen
Press the Advanced Comm SMB button to select the Advanced SMB Comm window. This tool provides
access to parameters using SMB and Manufacturing Access commands. See Figure 7.
Figure 7. Advanced Comm Screen

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Examples:
Reading an SMB Command.
• Read SBData Voltage (0x09)
– SMBus Read Word. Command = 0x09
– Word = 0x3A7B, which is hexadecimal for 14971 mV
Sending a MAC Gauging() to enable IT via ManufacturerAccess().
• With Impedance Track™ disabled, send Gauging() (0x0021) to ManufacturerAccess().
– SMBus Write Word. Command = 0x00. Data = 00 21
Reading Chemical ID() (0x0006) via ManufacturerAccess()
• Send Chemical ID() to ManufacturerAccess()
– SMBus Write Word. Command = 0x00. Data sent = 00 06
• Read the result from ManufacturerData()
– SMBus Read Block. Command = 0x23. Data read = 00 01
– That is 0x0100, chem ID 100

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4 bq40z80EVM Circuit Module Schematic
This section contains information on modifying the EVM and using various features on the reference
design. The jumpers on the board allow different pin configurations. The pin configuration in the registers
must match the jumper configuration on the bq40z80EVM . The Pin Configuration register can be set in
the Data Memory section of bqStudio. If a register is set to an undefined setting, the output is configured
as high-Z.
Table 4. bq40z80 EVM-RevB Jumper and Pin Configuration Register Settings
General Description Pin Configuration Register Setting Jumper
Connections Comments
Pack connector with
SYS_PRES J1 Connect PACK+ and PACK– to the appropriate pins on the battery pack
Header for cell
connections J12
Pin 1: 7P, Pin2: 6P, Pin3: 5P, Pin4: 4P, Pin5: 3P, Pin6:
2P, Pin7: 1P, Pin8: 1N(GND). If using less than 7 cells,
tie the unused cell pins (6P, 5P, etc) to the highest cell in
the stack
Pin
12
V7SENSE [MFP12_SEL2:MFP12_SEL0]=000
(EVM DEFAULT) J20[1,2], J7[1,2] Connects Pin 12 as V7SENSE to the middle of the voltage divider
TS3 [MFP12_SEL2:MFP12_SEL0]=001 J20[2,3] Connects Pin 12 as TS3 to a 10k NTC
ADCIN1 [MFP12_SEL2:MFP12_SEL0]=010 J20[1,2], J7[2,3] Connects Pin 12 to Pin 1 of J11. Connect a voltage between 0 V and 1 V to have the ADC read the voltage
at this pin
GPIO [MFP12_SEL2:MFP12_SEL0]=011
(DEVICE DEFAULT) J20[1,2], J7[2,3] Connects Pin 12 to Pin 1 of J11. Use this pin as a GPIO
Pin
13
/DISP [MFP13_SEL2:MFP13_SEL0]=000
(EVM DEFAULT) J21[1,2], J14[1,2] Connects Pin 13 (/DISP) to TP5 and S3
TS4 [MFP13_SEL2:MFP13_SEL0]=001 J21[2,3] Connects Pin 12 as TS4 to a 10k NTC
ADCIN2 [MFP13_SEL2:MFP13_SEL0]=010 J21[1,2], J14[2,3] Connects Pin 13 to Pin 5 of J11. Connect a voltage between 0 V and 1 V to have the ADC read the voltage
at this pin
GPIO [MFP13_SEL2:MFP13_SEL0]=011
(DEVICE DEFAULT) J21[1,2], J14[2,3] Connects Pin 13 to Pin 5 of J11. Use this pin as a GPIO
Pin
15
VC7EN [MFP15_SEL1:MFP15_SEL0]=00
(EVM DEFAULT) J6[1,2] Connects Pin 15 (VC7EN) to the gate of Q6 to enable
the voltage divider so a scaled voltage of the top of stack
is applied to VC7SENSE
/DISP [MFP15_SEL1:MFP15_SEL0]=01 J6[2,3], J8[1,2] Connects Pin 15 (/DISP) to TP5 and S3
GPIO [MFP15_SEL1:MFP15_SEL0]=10
(DEVICE DEFAULT) J6[2, 3], J8[2, 3] Connects Pin 15 (GPIO) to Pin 2 of J11
Pin
16
CB7EN [MFP16_SEL1:MFP16_SEL0]=00
(EVM DEFAULT) J10[1,2] Connects Pin 17 (CB7EN) to the gate of Q11 for external cell balancing for the 7th cell
PDSG [MFP16_SEL1:MFP16_SEL0]=01 J10[2, 3], J9[1,2] Connects Pin 16 (PDSG) to the gate of Q7 to enable pre-
discharge through Q5
GPIO [MFP16_SEL1:MFP16_SEL0]=10
(DEVICE DEFAULT) J10[2,3], J9[2,3] Connects Pin 62 to Pin 4 of J11. Use this pin as a GPIO
Pin
17
/PRES [MFP17_SEL2:MFP17_SEL0]=000
(EVM DEFAULT) J5[1,2] Connects Pin 17 (/PRES) to Pin 3 of J2
SHUTDN [MFP17_SEL2:MFP17_SEL0]=001 J5[1,2] Connects Pin 17 (/SHUTDN) to S3 pushbutton
/DISP [MFP17_SEL2:MFP17_SEL0]=010 J5[2,3], J3[1,2] Connects Pin 17 (/DISP) to TP5 and S2
PDSG [MFP17_SEL2:MFP17_SEL0]=011 J5[2,3], J3[2, 3],
J4[1,2] Connects Pin 17 (PDSG) to the gate of Q7 to enable pre- discharge through Q5
GPIO [MFP17_SEL2:MFP17_SEL0]=100
(DEVICE DEFAULT) J5[2,3], J3[2,3], J4[2,3] Connects Pin 17 (GPIO) to Pin 3 of J11
Pin
20
LEDCNTLA [MFP20_SEL2:MFP20_SEL0]=000
(EVM DEFAULT) J15[2,3] Connects pin 20 to LEDs to be used as LEDCNTLA. Must be used with LEDCNTLB and LEDCNTLC
PDSG [MFP20_SEL2:MFP20_SEL0]=010 J15[1,2], J13[1,2] Connects pin 20 (PDSG) to the gate of Q7 to enable pre- discharge through Q5. In this mode, Pins 21 and Pin 22
are used as GPIOs.
GPIO [MFP20_SEL2:MFP20_SEL0]=001
(DEVICE DEFAULT) J15[1,2], J13[2,3] Connects Pin 20 to Pin 6 of J11. Use this pin as a GPIO

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General Description Pin Configuration Register Setting Jumper
Connections Comments
Pin
21
LEDCNTLB [MFP20_SEL2:MFP20_SEL0]=000
(EVM DEFAULT) J17[1,2] Connects pin 21 to LEDs to be used as LEDCNTLB. Must be used with LEDCNTLA and LEDCNTLC
GPIO [MFP20_SEL2:MFP20_SEL0]=010 or [MFP20_SEL2:MFP20_SEL0]=001
(DEVICE DEFAULT) J17[2,3] Connects Pin 21 to Pin 7 of J11. Use this pin as a GPIO
Pin
22
LEDCNTLC [MFP20_SEL2:MFP20_SEL0]=000
(EVM DEFAULT) J16[1,2] Connects pin 22 to LEDs to be used as LEDCNTLC. Must be used with LEDCNTLA and LEDCNTLB
GPIO [MFP20_SEL2:MFP20_SEL0]=010 or [MFP20_SEL2:MFP20_SEL0]=001
(DEVICE DEFAULT) J16[2,3] Connects Pin 22 to Pin 8 of J11. Use this pin as a GPIO
4.1 Pre-Charge
The EVM provides a power resistor and FET to support a reduced current pre-charge path to charge the
pack when cell voltages are below the pre-charge voltage threshold. This reduces heating that could lead
to cell damage or reduced operating lifetime. For a 7-series cell application, the FET must be rated above
the max voltage, and for this reason the CSD18504Q5A was chosen. The TI CSD18504Q5A is a 50A, 40-
V device with Rds(on) of 5.3 mΩwhen the gate drive voltage is 10 V. The user can change R1 to setup the
pre-charge current to a different value. R1 is calculated to limit the precharge current to the desired rate.
Be sure to account for the power dissipation of the series resistor. The pre-charge current is limited to
(VCHARGER – VBAT)/R1 and maximum power dissipation is (Vcharger – Vbat)2/R1.
4.2 Pre-Discharge
The EVM provides a pre-discharge FET (Q5) and control options through jumpers to enable a pin to
function as PDSG to turn the FET on and off. The pre-discharge FET is used in applications where there
is a need to soft-start into a large capacitive load, such as a starter cap for a motor, in order to reduce the
instantaneous load current. The pre-discharge FET will slowly charge the cap based on voltage or time.
See the bq40z80 Technical Reference Manual,SLUUBT5 for full details.
4.3 LED Control
The EVM is configured to support six LEDs to provide state-of-charge information for the cells. If
configured with the correct jumpers, press the LED DISPLAY button to illuminate the LEDs for
approximately 4 seconds. Alternately, the LED's can be turned on with in the Commands tab with the
LED_TOGGLE to test the LED function, or DISPLAY_PRESS to display the Relative State of Charge.
4.4 Emergency Shutdown
The Emergency Shutdown function allows the user to disable the charge and discharge FETs with an
external GPIO pin. The EMSHUT and NR bits must be set high in the DA Configuration register to enable
this feature. Press the SHUTDOWN pushbutton switch for one second to disable these FETs, and press it
again for one second to enable them.
NOTE: Remember to remove the SYS PRES-to-PACK– short, if present.
4.5 Testing Fuse-Blowing Circuit
To prevent the loss of board functionality during the fuse-blowing test, the actual chemical fuse is not
provided on the EVM. FET Q drives the FUSE test point low if a fuse-blow condition occurs. FUSE is
attached to an open drain FET, so a pull-up resistor is required to check whether the FUSE pulls low. A
FUSEPIN test point is attached to the gate of Q; so, monitoring FUSEPIN can be used to test this
condition without adding a pull-up resistor. Fuse placement on the application board is shown in the
bq40z80 data sheet. A chemical fuse can also be soldered to the EVM for in-system testing. When using
the chemical fuse, remove the shorting resistor R1 from the board.

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bq40z80EVM Li-Ion Battery Pack Manager Evaluation Module
5 Circuit Module Physical Layouts
This section contains the printed-circuit board (PCB) layout, assembly drawings, and schematic for the
bq40z80 and bq771807 circuit modules.
5.1 Board Layout
This section shows the dimensions, PCB layers (see through ), and assembly drawing for the bq40z80
modules.
Figure 8. bq40z80EVM RevB Top Composite

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Figure 9. bq40z80EVM RevB Bottom Composite

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Figure 10. bq40z80EVM RevB Top Layer

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Figure 11. bq40z80EVM RevB Internal Layer 2 - GND

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Figure 12. bq40z80EVM RevB Internal Layer 3 - Signal