Texas Instruments bq2427 Series User Manual Download Page 10 | Manualshive

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Test Summary

Figure 5. Main Window of bq2427x EVM Evaluation Software

2.4

Recommended Test Procedure

The following test procedure is useful in evaluating the charger IC outside of a real system, especially
when no battery is available to connect to the output (i.e., Load #1).

2.4.1

System Voltage and Default Charge Settings

1. Ensure that the

steps are followed.

2. Connect the output of PS #1 in series with CM #1 to J2 (USB, GND).

3. Connect voltage meter 1 (VM #1) across J1 or TP2 and J3 (USB, GND).

4. With PS #2 disabled, turn on PS #1.

5. Ensure the electronic load is on current mode and set the current to 1 A or turn down the resistor

decade box until CM #3 measures 1000 ±100 mA.

10

QFN-Packaged bq24270/271 Evaluation Modules

SLUU924 – April 2012

Submit Documentation Feedback

Copyright © 2012, Texas Instruments Incorporated

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Summary of Contents for bq2427 Series

Page 1: ...st Summary 6 2 1 Definitions 6 2 2 Recommended Test Equipment 6 2 3 Recommended Test Equipment Setup 7 2 4 Recommended Test Procedure 10 3 Printed Circuit Board Layout Guideline 11 4 Bill of Materials and Board Layout 13 4 1 Bill of Materials 13 4 2 Board Layout 15 List of Figures 1 HPA758A Schematic 3 2 BAT_Load PR1010 Schematic 7 3 Connections of HPA172 Kit 8 4 Original Test Setup for bq24270 27...

Page 2: ...data sheet SLUSB10 1 2 bq24270 271EVM Features The bq24270 271EVM evaluation module EVM is a complete charger module for evaluating compact flexible high efficiency USB friendly switch mode battery charge The module also evaluates power path management solutions for single cell Li ion and Li polymer battery powered systems used in a wide range of portable applications Key EVM features include Inpu...

Page 3: ...w ti com Introduction 1 3 Schematic Figure 1 HPA758A Schematic 3 SLUU924 April 2012 QFN Packaged bq24270 271 Evaluation Modules Submit Documentation Feedback Copyright 2012 Texas Instruments Incorporated ...

Page 4: ...ative header J10 BAT Battery positive header J11 BAT Battery positive terminal J11 GND Battery negative terminal J12 GND Battery negative header J13 DRV DRV reference voltage positive header J14 DRV DRV reference voltage positive terminal J14 GND DRV reference voltage negative terminal J15 GND DRV reference voltage negative header 1 5 Test Points Test Point Description TP1 AGND TP2 Kelvin to USB T...

Page 5: ...he resistor divider formed by R1 and R3 has been sized to accommodate a 10 kΩ thermistor If a different thermistor is used R1 and R3 must be resized 2 3 TS SIM Connects a potentiometer to the TS so that the potentiometer can emulate a thermistor The potentiometer has been preset to approximately 3 4 kΩ so that the TS voltage is 0 5 x V DRV JP7 bq24270 only Shorted Shorting jumper for USB data line...

Page 6: ...al jumper Jxx terminals are open JPx YY ON Internal jumper Jxx adjacent terminals marked as YY are shorted Measure A B Check specified parameters A B If measured values are not within specified limits the unit under test has failed Observe A B Observe if A B occur If they do not occur the unit under test has failed Assembly drawings have location for jumpers test points and individual components 2...

Page 7: ...ntegrated circuit IC enters Default mode Note that the 27 minute safety timer is not reset by this function and eventually times out if charging does not complete unless the Safety Timer Time Limit is expanded or disabled via the GUI One way to reset the safety timer is to allow the 30 second watchdog timer to expire See Figure 3 in the data sheet for more information about the timers Also it is g...

Page 8: ...d or resistor decade box in series with a current meter multimeter to J5 and J9 or J7 SYS GND Ensure the electronic load is in current mode and set to 0 A or the resistor decade box is set to the maximum resistance 6 Connect VM 3 across J5 or TP4 and J9 SYS GND 7 Connect VM 4 across J13 and J15 DRV GND 8 Connect J6 to HPA172 kit by the 10 pin ribbon cable Connect the USB port of the HPA172 kit to ...

Page 9: ...ure 4 Original Test Setup for bq24270 271EVM HPA758 11 Turn on the computer Open the bq2427x evaluation software and click USB DEVICE when prompted at start up The main window of the software is shown in Figure 5 9 SLUU924 April 2012 QFN Packaged bq24270 271 Evaluation Modules Submit Documentation Feedback Copyright 2012 Texas Instruments Incorporated ...

Page 10: ...t Charge Settings 1 Ensure that the Section 2 3 steps are followed 2 Connect the output of PS 1 in series with CM 1 to J2 USB GND 3 Connect voltage meter 1 VM 1 across J1 or TP2 and J3 USB GND 4 With PS 2 disabled turn on PS 1 5 Ensure the electronic load is on current mode and set the current to 1 A or turn down the resistor decade box until CM 3 measures 1000 100 mA 10 QFN Packaged bq24270 271 E...

Page 11: ... by VM 2 across BAT and GND measures 3 2 V 50 mV 10 Adjust the power supply so that VM 1 still reads 6 V 100 mV if necessary then Measure on CM 2 ICHRG 1000 mA 100 mA Measure on CM 1 IIN 850 mA Observe D1 and D2 are on 11 Turn off PS 1 and PS 2 2 4 3 Helpful hints 1 Observe the taper current as the battery voltage approaches the set regulation voltage allow the battery to charge or if using BAT_Lo...

Page 12: ...ossible A star ground design approach is typically used to keep circuit block currents isolated high power low power small signal which reduces noise coupling and ground bounce issues A single ground plane for this design gives good results This small layout and a single ground plane eliminates ground bounce issues and having the components segregated minimizes coupling between signals 6 The high ...

Page 13: ...0 303 Inches UX60 MB 5ST Hiroise 1 1 J6 N2510 6002 RB Connector Male Straight 2x5 pin 100mil spacing 4 0 338 x 0 788 inch N2510 6002 RB 3M Wall 3 3 JP1 JP2 JP6 PEC03SAAN Header Male 3 pin 100mil spacing 0 100 inch x 3 PEC03SAAN Sullins 0 1 JP3 PEC03SAAN Header Male 3 pin 100mil spacing 0 100 inch x 3 Sullins 1 0 JP7 PEC03SAAN Header Male 2 pin 100mil spacing 0 100 inch x 2 PEC02SAAN Sullins 1 1 L1...

Page 14: ...olor Keyed 0 100 x 0 100 inch 5002 Keystone 1 0 U1 BQ24270RGE IC 1 5A Single Input Single Cell Switchmode Li Ion QFN 24 BQ24271RGE TI BATTERY CHARGER with Power Path Management and I2C Interface 0 1 U1 BQ24271RGE IC 1 5A Single Input Single Cell Switchmode Li Ion QFN 24 BQ24271RGE TI BATTERY CHARGER with Power Path Management and I2C Interface 4 4 Shunt 100 mil Black 0 100 929950 00 3M 1 1 PCB 3 0...

Page 15: ... of Materials and Board Layout 4 2 Board Layout Figure 6 Top Assembly Layer 15 SLUU924 April 2012 QFN Packaged bq24270 271 Evaluation Modules Submit Documentation Feedback Copyright 2012 Texas Instruments Incorporated ...

Page 16: ...ll of Materials and Board Layout www ti com Figure 7 Top Layer 16 QFN Packaged bq24270 271 Evaluation Modules SLUU924 April 2012 Submit Documentation Feedback Copyright 2012 Texas Instruments Incorporated ...

Page 17: ...om Bill of Materials and Board Layout Figure 8 First Internal Layer 17 SLUU924 April 2012 QFN Packaged bq24270 271 Evaluation Modules Submit Documentation Feedback Copyright 2012 Texas Instruments Incorporated ...

Page 18: ...Materials and Board Layout www ti com Figure 9 Second Internal Layer 18 QFN Packaged bq24270 271 Evaluation Modules SLUU924 April 2012 Submit Documentation Feedback Copyright 2012 Texas Instruments Incorporated ...

Page 19: ...ti com Bill of Materials and Board Layout Figure 10 Bottom Layer 19 SLUU924 April 2012 QFN Packaged bq24270 271 Evaluation Modules Submit Documentation Feedback Copyright 2012 Texas Instruments Incorporated ...

Page 20: ...ency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES 003 rules which are designed to provide reasonable protection against radio frequency interference Operation of the equipment may cause interference with radio communications in which case the user at his own expense will be required to take whatever measures may be required t...

Page 21: ... its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary for successful communication This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this l...

Page 22: ...er you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect to this product Also please do not transfer this product unless you give the same notice above to the transferee Please note that if you could not follow the instructions above you will be subject to penalties of Radio Law of Japan Texas Instruments Japan Limited address 24 1 Nishi Shi...

Page 23: ... property damage personal injury or death If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and intended loads Any loads applied outside of the specified output range may result in unintended and or inaccurate operation and or possible permanent damage to the EVM and or interface electronics Plea...

Page 24: ...ency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES 003 rules which are designed to provide reasonable protection against radio frequency interference Operation of the equipment may cause interference with radio communications in which case the user at his own expense will be required to take whatever measures may be required t...

Page 25: ... its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary for successful communication This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this l...

Page 26: ...er you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect to this product Also please do not transfer this product unless you give the same notice above to the transferee Please note that if you could not follow the instructions above you will be subject to penalties of Radio Law of Japan Texas Instruments Japan Limited address 24 1 Nishi Shi...

Page 27: ... property damage personal injury or death If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and intended loads Any loads applied outside of the specified output range may result in unintended and or inaccurate operation and or possible permanent damage to the EVM and or interface electronics Plea...

Page 28: ...regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures monitor failures and their consequence...

Page 29: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments BQ24271EVM 758 ...

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