Texas Instruments BQ24296, bq24297 Datasheet

User's Guide

SLUUAQ1–August 2013

bq24296/7 EVM (PWR021) User’s Guide

Contents

1 Introduction .................................................................................................................. 2

1.1 EVM Features ...................................................................................................... 2

1.2 I/O Descriptions .................................................................................................... 2

2 Test Summary ............................................................................................................... 4

2.1 Equipment ........................................................................................................... 4

2.2 Equipment Setup ................................................................................................... 5

2.3 Procedure ........................................................................................................... 6

3 PCB Layout Guideline .................................................................................................... 10

4 Board Layout, Schematic, and Bill of Materials ....................................................................... 11

4.1 Board Layout ...................................................................................................... 11

4.2 Schematic ......................................................................................................... 17

4.3 Bill of Materials .................................................................................................... 18

List of Figures

1 Connections of the HPA172 Kit........................................................................................... 5

2 Original Test Setup for PWR021 (bq2429xEVM) ...................................................................... 5

3 Main Window of the bq2429x Evaluation Software .................................................................... 6

4 CHG Mode Ripple and Duty Cycle: V 5 Boost Mode Ripple and Duty Cycle; V

6 bq2429xEVM Top Layer.................................................................................................. 11

7 bq2429xEVM Second Layer ............................................................................................. 12

8 bq2429xEVM Third Layer ................................................................................................ 13

9 bq2429xEVM Bottom Layer.............................................................................................. 14

10 bq2429xEVM Top Assembly............................................................................................. 15

11 bq2429xEVM Bottom Assembly......................................................................................... 16

12 bq24x9xEVM Schematic.................................................................................................. 17

= 5 V, V

BUS

= 3.7 V ...................................................................... 9

BAT

= 3.7 V.......................................................... 8

BAT

List of Tables

1 Device Data Sheets ........................................................................................................ 2

2 EVM Connections........................................................................................................... 2

3 Jumper Connections........................................................................................................ 3

4 Recommended Operating Conditions.................................................................................... 3

5 Device ID JEITA Settings.................................................................................................. 9

6 Bill of Materials............................................................................................................. 18

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Introduction

1 Introduction

1.1 EVM Features

For detailed features and operation, refer to Table 1 for a list of devices and their data sheets.

The bq24296 and bq24297 evaluation module (EVM) is a complete charger module for evaluating an I2Ccontrolled single NVDC-1 charge using the bq24296 and bq24297 devices.

This EVM doesn’t include the USB-to-GPIO interface board. To evaluate the EVM, a USB-to-GPIO interface board must be ordered separately.

1.2 I/O Descriptions

Table 2 lists the jumper connections available on this EVM.

Jack Description

J1–PMID PMID pin connection/Power bank output J1–VBUS Input: positive terminal J1–GND Input: negative terminal (ground terminal) J2-SYS Connected to system J2-BAT+ Connected to battery pack J2-GND Ground J3 USB-to-GPIO connector (USB Interface Adapter Connector - HPA172) J4–INT INT pin connection J4– OTG OTG pin connection J4-CE CE pin connection J4-GND Ground J5-TS2 External TS2 pin connection J5-GND Ground J6-TS1 External TS1 pin connection J6-GND Ground J7 Mini_USB Connector

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Table 1. Device Data Sheets

Device Document

bq24296/7 SLUSBP6

Table 2. EVM Connections

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Table 3 lists the controls and key parameter settings for this EVM.

Table 4 lists the recommended operating conditions for this EVM.

Introduction

Table 3. Jumper Connections

Jack Description Factory Setting

JP1 For bq24296/7 input current setting: bq24297: Not installed

PSEL LOW: Adaptor input bq24296: PSEL HIGH: USB input Short PSEL to LOW

JP2 D-/PG pin selection bq24297: Short D-/PG to D-

bq24296:

Short D-/PG to PG JP3 STAT, PG, /CE, INT, OTG pin internal pull-up source (VSYS) jumper Installed JP4 USB current limit selection pin during buck mode and PSEL is high (JP1- Not installed

High)/Enable pin during boost mode. In buck mode: OTG = High, IIN limit = 500 mA; OTG = Low, IIN limit = 100 mA. The boost mode is activated when the REG01[5:4] = 10 and OTG pin is HIGH.

JP5 CE pin setting: pull low to enable the charge Not Installed

(GUI also can pull /CE low) JP6 For bq24297 input current limit setting: bq24297: installed

bq24296: Not installed JP7 TS1 resistor divider pull-up source (REGN) connection Installed JP8 internal 10k to ground to TS1 Installed JP9 internal 10k to ground to TS2 Installed JP10 TS2 pin setting: bq24296/7: Short TS2 and TS2-I

Table 4. Recommended Operating Conditions

Symbol Description MIN TYP MAX Unit

Supply voltage, VINbq24296/7 Input voltage from AC adapter 3.9 5 6 VDC Battery voltage, V Supply current, I

Output current, I Operating junction temperature 0 125 °C

range, T

BAT

OUT

Voltage applied at V Maximum input current from AC adapter 0 3 A

input Output current 0 4 A

terminal 0 3.7 4.25 V

BAT

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Test Summary

2 Test Summary

Section 2.1 – Section 2.3 explains the equipment, the equipment setup, and the test procedures.

2.1 Equipment

2.1.1 Power Supplies

Power supply #1 (PS#1): a power supply capable of supplying 5 V at 1 A is required. While this part can handle larger voltage and current, it is not necessary for this procedure.

2.1.2 Load #1 (4-Quadrant Supply, Constant Voltage < 4.5 V)

A 0–20 V/0–5 A, > 30-W system, DC electronic load and setting as constant voltage load mode. Or: Kepco load: BOP 20–5M, DC 0 to ±20 V, 0 to ±5 A (or higher) Or: Real single-cell battery

2.1.3 Load#2 – Use with Boost Mode

PMID to GND load, 10 Ω, 5 W or greater

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2.1.4 Meters

Six Fluke 75 multimeters, (equivalent or better) Or: Four equivalent voltage meters and two equivalent current meters. The current meters must be capable of measuring 5 A+ current.

2.1.5 Computer

A computer with at least one USB port and a USB cable. The bq2429xEVM evaluation software must be properly installed.

2.1.6 USB-to-GPIO Communication Kit (HPA172-USB Interface Adapter)

2.1.7 Software

Unzip the bq2429xEVM_GUI.zip and double-click on the SETUP.EXE file. Follow the installation steps. The software supports the Windows™ XP and Windows 7 operating systems.

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To Computer USB Port

USB Interface

Adapter

I/O

USB

10-pin

Ribbon Cable

‘To EVM’

Texas Instruments

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2.2 Equipment Setup

1. Set PS#1 for 5-V DC, 1-A current limit and then turn off the supply.

2. Connect the output of PS#1 in series with a current meter (multimeter) to J1 (V

3. Connect a voltage meter across J1 (V

4. Turn on the Load, set to constant voltage mode and output to 2.5 V. Turn off (disable) Load. Connect Load in series with a current meter (multimeter), ground side, to J2 (BAT+ and GND) as shown in

Figure 2.

5. Connect a voltage meter across J2 (BAT+ and GND).

6. Connect the HPA172 USB interface adapter to the computer with a USB mini-cable and to J3 with the 10-pin ribbon cable. The connections are shown in Figure 1.

) and J1 (GND).

BUS

and GND).

BUS

Test Summary

Figure 1. Connections of the HPA172 Kit

7. Install shunts as shown in Table 3.

Figure 2. Original Test Setup for PWR021 (bq2429xEVM)

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Test Summary

8. Turn on the computer. Launch the bq2429x evaluation software. The main window of the bq2429x software is shown in Figure 3.

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Figure 3. Main Window of the bq2429x Evaluation Software

2.3 Procedure

2.3.1 Current Settings

1. Make Sure EQUIPMENT SETUP steps are followed. ILIM Setting: Set the potentiometer to its lowest value for max input current by connecting an ohmmeter between point TP9 and ground. Turn the screw on the potentiometer counterclockwise until the resistance drops to its lowest point (this should be in the range of 125 Ω to 175 Ω, the value of R7)

2. Launch the Bq2429x EVM GUI software, if not already done

3. Turn on PS#1 Measure → V (J2(SYS), J2(GND)) = 4.10 ±300 mV

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2.3.2 Charge Voltage and Current Regulation of VINand Device ID Verification

Follow the steps and verify the outputs and IC for the EVM.

2.3.2.1 Software setup (all of Section 2.3.2.1 is done in the GUI):

1. Device address: bq24296/7

2. Click the Read button

3. Select Disabled for I2C Watchdog Timer Limit

4. Set Input Voltage Limit to 4.2 V

5. Set Input Current Limit to 500 mA

6. Set Charge Voltage Limit to 4.208 V

7. Set Fast Charge Current, ICHG to 512 mA

8. Set Pre-Charge Current to 256 mA

9. Deselect Enable Termination (see the following image)

Test Summary

10. Click the Read button twice Observe → Everything normal at FAULT box Observe → D1 (STAT) is on Observe → D2 (/PG) is on for the bq24296EVM

2.3.2.2 Enable Load#1 from Section 2.2 step 4. Measure the voltage across J2 at two different points:

Measure → V(J2(SYS), J2(GND)) = 3.65 V ±300 mV Measure → V(J2(BAT), J2(GND)) = 2.5 V ±200 mV

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CHG Mode: VBUS = 5 V VBAT = 3.7 V

Vsw

Vsys_AC coupled

Vprnid_AC coupled

Test Summary

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2.3.2.3 Increase the Constant Voltage Load to 3.7 V

Measure → V(J2(SYS), J2(GND)) = 3.75 V ±200 mV Measure → IBAT = 500 mA ±200 mA Measure → V(J2(BAT), J2(GND)) = 3.7 V ±200 mV

2.3.2.4 In the software, set Fast Charge Current, ICHG to 1.012 A

Measure → Iin = 500 mA ±200 mA

2.3.2.5 Verify Scope Measurements (See Figure 4 – 500 ns/div)

C1 (AC coupled 20 mV/div): Vac_PMID (TP20 to GND) – Ripple excluding high frequency spikes < 10 mV C2 (5 V/div): Vdc_SW (TP2) - Frequency between 1.25 MHz and 1.5 MHz, duty cycle between 73% and

81% C3 (AC coupled 20 mV/div): Vac_VSYS (TP3 to GND) - excluding high frequency spikes < 15 mV

Figure 4. CHG Mode Ripple and Duty Cycle: V

bq24296/7 EVM (PWR021) User’s Guide SLUUAQ1–August 2013

BUS

= 5 V, V

= 3.7 V

BAT

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+ 16 hidden pages

Texas Instruments BQ24296, bq24297 Datasheet

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Introduction

1.1 EVM Features

1.2 I/O Descriptions

2 Test Summary

2.1 Equipment

2.1.1 Power Supplies

2.1.2 Load #1 (4-Quadrant Supply, Constant Voltage < 4.5 V)

2.1.3 Load#2 – Use with Boost Mode

2.1.4 Meters

2.1.5 Computer

2.1.6 USB-to-GPIO Communication Kit (HPA172-USB Interface Adapter)

2.1.7 Software

2.2 Equipment Setup

2.3 Procedure

2.3.1 Current Settings

2.3.2 Charge Voltage and Current Regulation of VINand Device ID Verification

2.3.2.4 In the software, set Fast Charge Current, ICHG to 1.012 A