Texas Instruments Bq26220EVM-001 Manuale utente

User’s Guide

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User’s Guide

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION

PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided

may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective

considerations, including product safety measures typically found in the end product incorporating the goods.

As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic

compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned

within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE

WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,

IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY

PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user

indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products

received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction

of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic

discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE

TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not

exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM

User’s Guide prior to handling the product. This notice contains important safety information about temperatures

and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

DYNAMIC WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 2.6 V to 4.5 V and the output range of 2.6 V

to 4.5 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.

If there are questions concerning the input range, please contact a TI field representative prior to connecting

the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible

permanent damage to the EVM. Please consult the EVM User’s Guide prior to connecting any load to the EVM

output. If there is uncertainty as to the load specification, please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than 70°C. The EVM

is designed to operate properly with certain components above 70°C as long as the input and output ranges are

maintained. These components include but are not limited to linear regulators, switching transistors, pass

transistors, and current sense resistors. These types of devices can be identified using the EVM schematic

located in the EVM User’s Guide. When placing measurement probes near these devices during operation,

please be aware that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

SLUU151 –April 2003

4bq26220EVM-001 Single Cell Battery Monitor Evaluation Module

bq26220EVM-001 Single Cell Battery Monitor Evaluation

Module

Portable Powe

Contents

1 bq26220EVM–001 Battery Monitor Evaluation Module 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Circuit Module 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 EVM Hardware and Software Setup 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Operation 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Introduction

The bq26220EVM-001 is a complete evaluation system for the bq26220 flash-based battery

monitoring IC. The EVM includes one bq26220 circuit module, an EV2200 PC interface board

for gas-gauge evaluation, a PC serial cable, and Windows-based PC software.The circuit

module includes one bq26220 and all other components on-board necessary to monitor capacity

and other critical parameters in a one-cell Li-Ion battery pack.The circuit module connects

directly across the cell in a battery. With the EV2200 interface board and software, the user can

read the bq26220 data registers and evaluate the functions of the bq26220 under different

charge and discharge conditions

1.1 Features

The following list highlights some of the features of the bq26220 single cell battery monitor.

•Complete evaluation system for the bq26220 battery monitor IC

•Populated circuit module for quick setup

•PC software and interface board for easy evaluation

•Software allows data logging for system analysis

1.2 Kit Contents

•bq26220 circuit module with sense resistor

•EV2200 PC interface board

•Set of evaluation software disks entitled EV2200–26220

•PC serial cable

•Set of support documentation

1.3 Ordering Information

Table 1. Ordering Information

EVM Part Number Additional Devices Chemistry Pack Voltage Capacity

bq26220EVM–001 None Li-Ion/NiMH/NiCd 2.6 V to 4.5 V Any

SLUU151 –April 2003

bq26220EVM-001 Single Cell Battery Monitor Evaluation Module

2 Circuit Module

The circuit module in the bq26220EVM-001 is a complete and compact example solution for battery

monitoring of a single-cell Li-on pack.The circuit module incorporates a bq26220 battery monitor IC and all

other components necessary to accurately protect and monitor the charge and discharge of one Li-Ion

cell. This EVM can also be used for 3-series NiMH applications.

Contacts on the circuit module provide direct connection to the cell (BAT+, BAT–) and the serial

communications port (HDQ).The system load and charger connect across PACK+ and PACK–.

2.1 Pin Descriptions

•BAT+/PACK+ Cell positive/pack positive

•BAT–Cell negative

•PACK–Pack negative

•HDQ Serial communications port

•STAT Status output

•GPIO Programmable input/output port

2.2 Circuit Module Schematic

The schematic shows the circuit for the bq26220EVM-001 implementation.

2.2.1 Schematic

Figure 1 is the bq26220EVM-001 (SLUP165) circuit module schematic diagram.

GPIO

SRP

SRN

BAT

RBI

VCC

VSS

HDQ

bq26220PW

5.6 V

HDQ

PACK+

GPIO

PACK–

BAT–

R7 100 kΩ

UDG–03024

R6 20 mΩ

R5 100 kΩ

R3 100 Ω

100 ΩR2

100 Ω

0.1 µF

0.1 µFC2

0.1 µF

100 Ω

NOTE: R1, R2, and D1 are required for external use only.

Figure 1. bq26220EVM–001 Schematic

SLUU151 –April 2003

6bq26220EVM-001 Single Cell Battery Monitor Evaluation Module

2.3 Circuit Module Physical Layouts

This section contains the board layout and assembly drawings for the bq26220EVM-001 circuit module (SLUP165)

2.3.1 Board Layout

Figure 2 shows the PCB layers and assembly drawing for the circuit module.

Figure 2. Top Assembly

Figure 3. Silk 1

SLUU151 –April 2003

bq26220EVM-001 Single Cell Battery Monitor Evaluation Module

Figure 4. Layer 1

Figure 5. Layer 2

SLUU151 –April 2003

8bq26220EVM-001 Single Cell Battery Monitor Evaluation Module

2.4 List of Materials

Table 2. List of Materials

Ref Des Qty-001 Description MFG MFG Part# Size

PCB 1 Printed-circuit board, 0.031, FR4, SMOBC, HASL Any See FAB DWG

Terminal 1 Terminal block 3.5 mm On Shore ED555/2DS 3.5 mm ×2

Terminal 1 Terminal block 3.5 mm On Shore ED555/2DS 3.5 mm ×3

C1, C2, C3 3Capacitor, ceramic, 0.1 µF, 16 V, ±10%, X7R Panasonic ECJ-1VB1C104K 603

R6 1 Resistor, 0.020 Ω, 1/2 W, 1% IRC LR2010-01-R020-F 2010

R5, R7 2Resistor, 100 kΩ, 1/16 W, 5% Panasonic ERJ-3GSYJ104 603

R1, R2, R3, R4 4Resistor, 100 Ω, 1/16 W, 5% Venkel ERJ-3GSYJ101 603

D1, D2 2Diode, zener, 5.6 V Zetex BZX84C5V6 SPT-23

U1 1 Integrated circuit, gas gauge, bq26220PW TI bq26220PW TSSOP-8

Component count 16

Assembly Notes:

1. This assembly is ESD sensitive.

2. This assembly must comply with IPC–A–610 class 2 or better.

3. This assembly must be clean of flux residues and contaminants.

4. Use of no-clean flux is not acceptable.

2.5 Performance Specification Summary

This section summarizes the performance specifications of the bq26220EVM-001 circuit module. Table 3 gives the

performance specifications of the circuit.

Table 3. Performance Specification Summary(1)

Specification MIN TYP MAX UNIT

Input voltage BAT+/BAT–2.6 4.5 V

Charge and discharge current 4 A

Note: Maximum charge and discharge current. is limited by the PCB design and power dissipation of the 20-mΩ, 1/2 W sense resistor included

on the PCB.

SLUU151 –April 2003

bq26220EVM-001 Single Cell Battery Monitor Evaluation Module

3 EVM Hardware and Software Setup

This section describes how to install the EV2200-26220 PC software and how to connect the components

of the EVM.

3.1 Software Installation

The following steps install the EV2200-26220 software:

1. Insert disk 1 into a 3 1/2 inch floppy drive.

2. Select the 3 1/2 inch drive using My Computer.

3. Double-click on the Setup.exe icon.

4. The setup program prompts for the remaining disks and installs a Windows application group.

3.2 Hardware Installation

There are three hardware components to the bq26220EVM-001:

1. The bq26220EVM-001 circuit module

2. The EV2200 PC interface board

3. The PC

3.2.1 Connecting the bq26220EVM-001 Circuit Module to a Battery Pack

Figure 6 shows how to connect the bq26220EVM-001 circuit module to a Li-Ion cell and the system load/charger.

Cell

Load

bq26220EVM-001

Circuit Module

Charger

PACK

BAT–

PACK–

BAT

PACK

PACK–

Battery Pack

Figure 6. bq26220EVM-001 Circuit Module Connection to Cells and System Load/Charger

SLUU151 –April 2003

10 bq26220EVM-001 Single Cell Battery Monitor Evaluation Module

3.2.2 PC Interface Connection

The following steps configure the hardware for interface to the PC:

1. Connect bq26220EVM–001 to the EV2200 using wire leads as in the following table.

Table 4. Circuit Module-to-EV2200 Connection

bq26220 Based Battery EV2200

HDQ SMBD/HDQ1

PACK–VSS

2. Connect the PC serial cable to the EV2200 and the PC COM port.

The bq26220EVM-001 is now set up for operation.

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