Datasheet

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bq20z655

www.ti.com

SLUSAH8A –APRIL 2011–REVISED MAY 2012

SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION

ENABLED WITH IMPEDANCE TRACK™

Check for Samples: bq20z655

FEATURES

APPLICATIONS

• Next Generation Patented Impedance Track™

• Medical and Test Equipment

Technology Accurately Measures Available

• Portable Instrumentation

Charge in Li-Ion and Li-Polymer Batteries

• Rechargeable Battery Packs

– Better Than 1% Error Over the Lifetime of

• Industrial Equipment

the Battery

• Supports the Smart Battery Specification

DESCRIPTION

SBS V1.1

The bq20z655 SBS-compliant gas gauge and

• Flexible Configuration for 2-Series to 4-Series

protection IC, incorporating patented Impedance

Track™ technology, is a single IC solution designed

Li-Ion and Li-Polymer Cells

for battery-pack or in-system installation. The

• Powerful 8-Bit RISC CPU with Ultralow Power

bq20z655 measures and maintains an accurate

Modes

record of available charge in Li-Ion or Li-Polymer

• Charge Enable (CE) Affects the Normal

batteries using its integrated high-performance

Operation on the Charge FET when the Battery

analog peripherals. The bq20z655 monitors capacity

Is in Charge/Relax Mode

change, battery impedance, open-circuit voltage, and

other critical parameters of the battery pack which

• Full Array of Programmable Protection

reports the information to the system host controller

Features

over a serial-communication bus. Together with the

– Voltage, Current, and Temperature

integrated analog front-end (AFE) short-circuit and

• Satisfies JEITA Guidelines

overload protection, the bq20z655 maximizes

functionality and safety while minimizing external

• Added Flexibility to Handle More Complex

component count, cost, and size in smart battery

Charging Profiles

circuits.

• Lifetime Data Logging

The implemented Impedance Track™ gas gauging

• Drives 3, 4, or 5 Segment Liquid Crystal

technology continuously analyzes the battery

Display and LED for Battery-Pack Conditions

impedance, resulting in superior gas-gauging

• Supports SHA-1 Authentication

accuracy. This enables remaining capacity to be

calculated with discharge rate, temperature, and cell

• Complete Battery Protection and Gas Gauge

aging all accounted for during each stage of every

Solution in One Package

cycle with high accuracy.

• Available in a 44-Pin TSSOP (DBT) Package

Table 1. AVAILABLE OPTIONS

PACKAGE

(1)

44-PIN TSSOP (DBT) Tube 44-PIN TSSOP (DBT) Tape and Reel

–40°C to 85°C bq20z655DBT

(2)

bq20z655DBTR

(3)

(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com.

(2) A single tube quantity is 40 units.

(3) A single reel quantity is 2000 units.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2Impedance Track is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (25 pages)

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bq20z655 www.ti.com SLUSAH8A – APRIL 2011 – REVISED MAY 2012 SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION ENABLED WITH IMPEDANCE TRACK™ Check for Samples: bq20z655 FEATURES APPLICATIONS • • • • • 1 2 • • • • • • • • • • • • Next Generation Patented Impedance Track™ Technology Accurately Measures Available Charge in Li-Ion and Li-Polymer Batteries – Better Than 1% Error Over the Lifetime of the Battery Supports the Smart Battery Specification SBS V1.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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bq20z655 www.ti.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com TYPICAL LCD IMPLEMENTATION Figure 2 shows a typical LCD implementation. bq20z655 27 25 24 23 12 S5 SEG4 S4 SEG3 S3 SEG2 S2 SEG1 LCD 5 Seg Display 26 SEG5 S1 BP COM 330 KΩ (x6) 8 21 REG33 220 KΩ DSPL 0.1 µF Figure 2.
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bq20z655 www.ti.com SLUSAH8A – APRIL 2011 – REVISED MAY 2012 TERMINAL FUNCTIONS TERMINAL (1) I/O (1) DESCRIPTION NO. NAME 1 DSG O 2 PACK IA, P 3 VCC P Positive device supply input. Connect to the center connection of the CHG FET and DSG FET to ensure device supply either from battery stack or battery pack input. 4 ZVCHG O P-chan pre-charge FET gate drive 5 GPOD OD 6 PMS I Pre-charge mode setting input. Connect to PACK to enable 0v pre-charge using charge FET connected at CHG pin.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com TERMINAL FUNCTIONS (continued) TERMINAL I/O (1) DESCRIPTION NO. NAME 38 VC5 IA, P Cell voltage sense input and cell balancing input for the negative voltage of the bottom cell in cell stack. 39 VC4 IA, P Cell voltage sense input and cell balancing input for the positive voltage of the bottom cell and the negative voltage of the second lowest cell in cell stack.
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bq20z655 www.ti.com SLUSAH8A – APRIL 2011 – REVISED MAY 2012 RECOMMENDED OPERATING CONDITIONS (continued) Over operating free-air temperature range (unless otherwise noted) PIN VIN Input voltage range MIN NOM MAX UNIT VC(n) – VC(n+1); n = 1,2,3,4 0 5 V VC1, VC2, VC3, VC4 0 VSS V VC5 0 0.5 V –0.5 0.5 V V ASRN, ASRP PACK, PMS 0 25 V(GPOD) Output voltage range GPOD 0 25 V I(GPOD) Drain current (1) GPOD 1 mA C(REG25) 2.5V LDO capacitor REG25 1 µF C(REG33) 3.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Over operating free-air temperature range (unless otherwise noted), TA = –40°C to 85°C, V(REG25) = 2.41 V to 2.59 V, V(BAT) = 14 V, C(REG25) = 1 µF, C(REG33) = 2.2 µF; typical values at TA = 25°C (unless otherwise noted) PARAMETER ΔV(REG25LOA Load regulation D) I(REG25MAX) Current limit TYP MAX 0.2 mA ≤ I(REG25OUT) ≤ 2 mA TEST CONDITIONS MIN 7 25 0.
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bq20z655 www.ti.com SLUSAH8A – APRIL 2011 – REVISED MAY 2012 ELECTRICAL CHARACTERISTICS (continued) Over operating free-air temperature range (unless otherwise noted), TA = –40°C to 85°C, V(REG25) = 2.41 V to 2.59 V, V(BAT) = 14 V, C(REG25) = 1 µF, C(REG33) = 2.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Over operating free-air temperature range (unless otherwise noted), TA = –40°C to 85°C, V(REG25) = 2.41 V to 2.59 V, V(BAT) = 14 V, C(REG25) = 1 µF, C(REG33) = 2.2 µF; typical values at TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS Effective input resistance (6) MIN TYP MAX UNIT 8 MΩ COULOMB COUNTER Input voltage range –0.
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bq20z655 www.ti.com SLUSAH8A – APRIL 2011 – REVISED MAY 2012 POWER-ON RESET Over operating free-air temperature range (unless otherwise noted), TA = –40°C to 85°C, V(REG25) = 2.41 V to 2.59 V, V(BAT) = 14 V, C(REG25) = 1 µF, C(REG33) = 2.2 µF; typical values at TA = 25°C (unless otherwise noted) PARAMETER VIT- Negative-going voltage input VHYS Power-on reset hysteresis tRST RESET active low time TEST CONDITIONS Active low time after power up or watchdog reset MIN TYP MAX UNIT 1.7 1.8 1.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com SMBus TIMING CHARACTERISTICS (continued) TA = –40°C to 85°C Typical Values at TA = 25°C and VREG25 = 2.
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bq20z655 www.ti.com SLUSAH8A – APRIL 2011 – REVISED MAY 2012 FEATURE SET Primary (1st Level) Safety Features The bq20z655 supports a wide range of battery and system protection features that can easily be configured.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com Lifetime Data Logging Features The bq20z655 offers lifetime data logging, where important measurements are stored for warranty and analysis purposes.
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bq20z655 www.ti.com SLUSAH8A – APRIL 2011 – REVISED MAY 2012 CONFIGURATION Oscillator Function The bq20z655 fully integrates the system oscillators therefore, no external components are required for this feature. System Present Operation The bq20z655 periodically verifies the PRES pin and detects that the battery is present in the system via a low state on a PRES input. When this occurs, the bq20z655 enters normal operating mode.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com COMMUNICATIONS The bq20z655 uses SMBus v1.1 with Master Mode and package error checking (PEC) options per the SBS specification. SMBus On and Off State The bq20z655 detects an SMBus off state when SMBC and SMBD are logic-low for ≥ 2 seconds. Clearing this state requires either SMBC or SMBD to transition high. Within 1 ms, the communication bus is available. SBS Commands Table 2.
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bq20z655 www.ti.com SLUSAH8A – APRIL 2011 – REVISED MAY 2012 Table 2.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com Table 3.
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bq20z655 www.ti.
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bq20z655 SLUSAH8A – APRIL 2011 – REVISED MAY 2012 www.ti.com REVISION HISTORY Changes from Original (April 2011) to Revision A Page • Changed Thermal Information .............................................................................................................................................. 2 • Changed System Partitioning Diagram .................................................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device BQ20Z655DBTR Package Package Pins Type Drawing TSSOP DBT 44 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 24.4 Pack Materials-Page 1 6.8 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 11.7 1.6 12.0 24.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ20Z655DBTR TSSOP DBT 44 2000 367.0 367.0 45.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.