Texas Instruments BQ24180 User manual

User's Guide
SLUU419A–April 2010–Revised April 2011
bq24180 Evaluation Module
The bq24180 evaluation module allows for the complete evaluation of the bq24180, a switch-mode,
charge-management device for single-cell Li-ion and Li-polymer batteries used in a wide range of portable
applications. This document provides a test summary, equipment setup, and the procedures for using with
a single-cell battery or a simulated battery load.
Contents
1 Introduction .................................................................................................................. 2
1.1 EVM Features ...................................................................................................... 2
1.2 General Description ................................................................................................ 2
1.3 I/O Description ...................................................................................................... 2
1.4 Control and Key Parameters Setting ............................................................................ 3
1.5 Recommended Operating Conditions ........................................................................... 3
2 Test Summary ............................................................................................................... 3
2.1 Equipment ........................................................................................................... 3
2.2 DCOUT Load #2 ................................................................................................... 3
2.3 Multimeters and Oscilloscope .................................................................................... 3
2.4 Computer ............................................................................................................ 4
2.5 HPA172 Communication Kit ...................................................................................... 4
2.6 Software ............................................................................................................. 4
3 Equipment Setup ............................................................................................................ 4
4 Procedure for Use With Single-Cell Li-Ion Battery or Simulated Battery Load ..................................... 6
4.1 Charge Voltage and Current Regulation ........................................................................ 6
5 Schematic, Board Layouts, and Bill of Materials ........................................................................ 8
5.1 bq24180EVM Schematic .......................................................................................... 8
5.2 Board Layouts ...................................................................................................... 9
5.3 Bill of Materials .................................................................................................... 13
List of Figures
1 Connections of HPA172 Kit................................................................................................ 4
2 Evaluation Setup............................................................................................................ 5
3 Main Window of bq24180 Evaluation Software......................................................................... 5
4 TP9 –Switch Node at 5-Vdc Input and 1.15-A Charge With 3.3-Vdc Battery ...................................... 7
5 Top Assembly ............................................................................................................... 9
6 Top Copper Layer......................................................................................................... 10
7 Bottom Copper Layer ..................................................................................................... 11
8 Silkscreen................................................................................................................... 12
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Introduction www.ti.com
1 Introduction
1.1 EVM Features
•Evaluation module for bq24180
•High-efficiency, fully integrated NMOS-NMOS synchronous buck charger with 3-MHz frequency
•Integrated power FETs for up to 1.5-A charge rate
•Programmable battery voltage, charge current, and input current via I2C interface
•Input operating range 4-V to 9.5-V normal operation and 9.5-V to 16-V limited operation
•Switched battery power, DCOUT
•LED indication for status signals
•Test points for key signals available for testing purposes. Easy probe hook-up
•Jumpers available. Easy-to-change connections.
1.2 General Description
The bq24180 evaluation module (EVM) is a complete charger module for evaluating a compact, flexible,
high-efficiency, USB-friendly switch-mode charge-management solution for single-cell Li-ion and
Li-polymer batteries used in a wide range of portable applications.
The bq24180 integrates a synchronous PWM controller, power MOSFETs, input current sensing,
high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.
The charge parameters can be programmed through an I2C interface.
For details, see the bq24180 data sheet (SLUSA02).
1.3 I/O Description
Jack Description
J1–DC+ AC adapter or USB, positive output
J1–GND AC adapter or USB, Ground
J2–(CSOUT) Connect to battery positive terminal
J2–BAT–(GND) Battery negative terminal, connect to Ground (DC–)
J5–SCL I2C clock, connect to SCL pin
J5–SDA I2C data, connect to SDA pin
J5–DC–AC adapter or USB, Ground
J4–Communication Connector Connect to 10-pin ribbon cable to USB interface adapter
J3–DCOUT Switched battery connection
J3–GND AC adapter or USB, Ground
J6–TS Connect to external 4.7k NTC thermistor if JMP4 is removed.
J6–STAT External status monitor connection; set JMP3 shunt to EXT
J6–INT Status indication for host processor
J6–GND Ground reference connection
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Simulated Battery Load Circuit
IN5821
www.ti.com Test Summary
1.4 Control and Key Parameters Setting
Jack Description Factory Setting
JMP1 HI 1-2: CD high (disables charge) Jumper on LO (2-3)
LO 2-3: CD low (enables charge)
JMP2 HI 1-2: high (USB source connected) Jumper on (1-2)
LO 1-2: low (adapter source connected)
JMP3 LED 1-2: Connect STAT pin to LED on EVM Jumper on LED (1-2)
EXT 2-3: Connect STAT pin to J6-3
JMP4 HI 1-2: High (charger disabled in default mode) Jumper on LED (2-3)
LO 2-3: TS biased with fixed 4.7-kΩresistor
1.5 Recommended Operating Conditions
Min Typ Max Unit
Supply voltage, VIN Input voltage from ac adapter input 4 5 9 V
Battery voltage, VBAT Voltage applied at VBAT terminal of J8 0 3-4.2 4.44 V
Supply current, IAC Maximum input current from ac adapter input 0 0.1–0.5 1.5 A
Charge current, Ichrg Battery charge current 0.55 0.7 1.5 A
Operating junction temperature range, TJ0 125 °C
2 Test Summary
2.1 Equipment
2.1.1 Power Supplies
Power Supply 1 (PS#1) is a power supply capable of supplying 5 V at 2 A.
Optional Power Supply 2 is for use with optional battery simulated load (PS#2), a power supply capable of
supplying 5 V at 2 A.
2.1.2 Battery Pack or Simulated Load
A Li-ion, single-cell pack with capacity of at least 1200 mAh can be used or a simulated load of 2.8 Ω(two
5.6-Ω,≥10-W power resistors in parallel), with a 0.1-Ωcurrent sense in the return to the UUT and a power
silicon diode (cathode) connected to the BAT+ side of the load.
2.2 DCOUT Load #2
A≥25-Ω,≥3-W power resistor
2.3 Multimeters and Oscilloscope
Three Fluke 75, (equivalent or better) multimeters
Oscilloscope that can capture 10-MHz waveforms
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To Computer
USB port
10 - pin
Ribbon Cable
To EVM
Texas Instruments
© 2006
USB
USB Interface
Adapter
I/O
Equipment Setup www.ti.com
2.4 Computer
A computer with at least one USB port and a USB cable. The bq24180 evaluation software must be
properly installed.
2.5 HPA172 Communication Kit
A HPA172 USB to I2C communication kit.
2.6 Software
1.0 BQ24180A_Gui_Software.zip
Double-click on the SETUP.EXE file. Follow the installation steps.
3 Equipment Setup
1. Set PS#1 for 5 V ±100 mVdc, 1.7 ±0.1-A current limit and then turn off supply. Connect the output of
PS#1 to J1 (DC+, DC–).
2. If simulated battery circuit is used in place of a battery, set the PS#2 for 3.5 V ±100 mVdc, 1.8 ±0.1-A
current limit and then turn off supply.
3. Connect the battery (discharged to ~3.1 V) or simulated battery load to J2 as shown in Figure 2. If
simulated load is used, connect the output of PS#2 (+ lead) to the anode of the simulated load and
return to ground (DC–).
4. Connect the system load to J3 (DCOUT, GND).
5. Connect digital multimeter 1 (DMM#1) across J2 (BAT+, GND), and set to measure DCV (5-V range).
6. Connect DMM#2 across BAT–Sense Resistor (0.1 Ω,≥2 W), and set to measure mVdc (<300-mV
range).
7. Connect DMM#3 across the J3 (DCOUT, GND), and set to measure DCV (5-V range).
8. Connect J4 to HPA172 kit by 10-pin ribbon cable. Connect the USB port of the HPA172 kit to the USB
port of the computer. The connections are shown in Figure 1.
Figure 1. Connections of HPA172 Kit
9. Install jumpers JMP1-2/3 (CD, GND); JMP2-1/2 (PSEL, HI); JMP3-1/2 (LED); JMP4-2/3 (TS_4.7k,
GND)
10. Connect scope to TP9 and set to 2 V/div and 200 ns/div (not shown in setup).
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www.ti.com Equipment Setup
Figure 2. Evaluation Setup
11. Ensure that EQUIPMENT SETUP steps are followed. Turn on the computer. Open the bq24180
evaluation software, by double-clicking on bq24180.exe (file found in the product folder, but needs
uploaded to the computer running the test). The main window of the software is shown in Figure 3.
Figure 3. Main Window of bq24180 Evaluation Software
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Procedure for Use With Single-Cell Li-Ion Battery or Simulated Battery Load www.ti.com
4 Procedure for Use With Single-Cell Li-Ion Battery or Simulated Battery Load
4.1 Charge Voltage and Current Regulation
•Turn on PS#2 if simulated battery load is used and then PS#1.
•Software setup:
(a) Under Settings: Set Maximum Battery Regulation Voltage to 4.3 V via the pulldown window.
(b) Under Settings: Set Maximum Charge Current to 1.55 A via the pulldown window.
(c) Under Registers R0-R7: Click the Write button (W) by the Safety Limit (R6) in the lower right
corner. These values can only be changed on the first write command after having been powered
by the battery.
(d) Under Watchdog Timer: Check the Periodic Resets box, and set time to 20 Sec.
(e) On the Top Tool Bar: Select the Write On Change button to turn to ON.
(f) On the Top Tool Bar: Select the Auto Read button to turn to ON, and set the time to 10 Sec via
the pulldown window.
•Measure and verify the following conditions:
–Verify →Meter #1 is between 3.0 and 3.4 V. (If battery is used and its voltage is over the default
regulation voltage, then there is no charge current.)
–Verify →Meter #2 is between 9 mV and 15 mV (90 to 150 mA)
–Verify →Meter #3 is between 0.0 and 0.1 V.
–Verify →Input Current of PS#1 is between 80 mA and 100 mA.
–Verify →The STAT LED, on the UUT, is off (disabled).
This is an example of default mode where the input current limit is 100 mA, maximum, with a maximum
regulation of 3.5 V. If VBAT >3.5 V, then the charge current goes to zero.
•Operation Changes Via Software:
(a) Under Settings: Set Battery Regulation Voltage to 4.0 V via the pulldown window.
(b) Under Settings: Set USB Host Current Limit to No Limit via the pulldown window.
(c) Under Settings: Set Charge Current (ICHG) to 1.15 A via the pulldown window.
(d) Under Controls: Check the Enable DCOUT box.
(e) Under Controls: Check the Enable STAT Function box.
•Measure and verify the following conditions:
–Verify →Meter #1 is between 3.2 V and 3.6 V.
–Verify →Meter #2 is between 80 mV and 120 mV (800 mA to 1200 mA).
–Verify →Meter #3 is between 3.2 V and 3.6 V.
–Verify →Input Current of PS#1 is between 75 mV and 100 mV (750 mA and 1000 mA).
–Verify →The STAT LED, on the UUT, is on (enabled).
This shows operation in fast charge constant current.
•Measure TP9 with ground sleeve of oscilloscope probe touching TP8 (GND). Set the oscilloscope to
200 ns/div and 2 V/div. The waveform must look like Figure 4 with the following boundaries: frequency
must be 3 MHz ±20%, the amplitude is +5 V ±0.5 V and 0 V to –0.5 V and the duty cycle is 30 ±10%
duty cycle.
•Uncheck the Watchdog Timer box and wait until the charge goes into default mode (less than 35
seconds), and observe that the charge current has dropped to ~125 mA (USB 100-mA input current
limit).
•Ground the TS pin by placing a short between J6-TS and J6-GND. This simulates a high-temperature
fault in default mode and shuts down the charge current in less than 35 seconds. To return to default
mode, remove the short.
A temperature fault in default mode shuts off the charge, whereas a temperature fault in normal
communication mode only notifies the host of a change in its register and does not disable the charge.
•See the data sheet for complete information on all specifications and functions.
•The software menu is intuitive and can be used to change many parameters.
•After evaluation, turn off PS#1 and then PS#2, if used.
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TP9_Switch node
www.ti.com Procedure for Use With Single-Cell Li-Ion Battery or Simulated Battery Load
Figure 4. TP9 –Switch Node at 5-Vdc Input and 1.15-A Charge With 3.3-Vdc Battery
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Schematic, Board Layouts, and Bill of Materials www.ti.com
5 Schematic, Board Layouts, and Bill of Materials
5.1 bq24180EVM Schematic
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www.ti.com Schematic, Board Layouts, and Bill of Materials
5.2 Board Layouts
Figure 5. Top Assembly
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Schematic, Board Layouts, and Bill of Materials www.ti.com
Figure 6. Top Copper Layer
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