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bq20z95

www.ti.com

SLUS757C –JULY 2007–REVISED OCTOBER 2013

SBS 1.1-COMPLIANT GAS GAUGE and PROTECTION ENABLED WITH IMPEDANCE

TRACK™

Check for Samples: bq20z95

FEATURES

DESCRIPTION

• Next Generation Patented Impedance Track™

The bq20z95 SBS-compliant gas gauge and

Technology Accurately Measures Available

protection IC is a single IC solution designed for

Charge in Li-Ion and Li-Polymer Batteries

battery-pack or in-system installation. The bq20z95

– Better Than 1% Error Over Lifetime of the

measures and maintains an accurate record of

Battery

available charge in Li-Ion or Li-Polymer batteries

using its integrated high-performance analog

• Supports the Smart Battery Specification

peripherals, monitors capacity change, battery

SBS V1.1

impedance, open-circuit voltage, and other critical

• Flexible Configuration for 2-Series to 4-Series

parameters of the battery pack as well and reports

Li-Ion and Li-Polymer Cells

the information to the system host controller over a

• Powerful 8-Bit RISC CPU With Ultra-Low

serial-communication bus. Together with the

Power Modes

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

overload protection, the bq20z95 maximizes

• Full Array of Programmable Protection

functionality and safety while minimizing external

Features

component count, cost, and size in smart battery

– Voltage, Current, and Temperature

circuits.

• Supports SHA-1 Authentication

The implemented Impedance Track™ gas gauging

• Complete Battery Protection and Gas Gauge

technology continuously analyzes the battery

Solution in One Package

impedance, resulting in superior gas-gauging

accuracy. This enables remaining capacity to be

• Small 44-Pin TSSOP (DBT) Package

calculated with discharge rate, temperature, and cell

aging all accounted for during each stage of every

APPLICATIONS

cycle with high accuracy.

• Notebook PCs

• Medical and Test Equipment

• Portable Instrumentation

Table 1. AVAILABLE OPTIONS

PACKAGE

(1)

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

–40°C to 85°C bq20z95DBT

(2)

bq20z95DBTR

(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 50 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 (21 pages)

PAGE 1
bq20z95 www.ti.com SLUS757C – JULY 2007 – REVISED OCTOBER 2013 SBS 1.1-COMPLIANT GAS GAUGE and PROTECTION ENABLED WITH IMPEDANCE TRACK™ Check for Samples: bq20z95 FEATURES 1 • 2 • • • • • • • Next Generation Patented Impedance Track™ Technology Accurately Measures Available Charge in Li-Ion and Li-Polymer Batteries – Better Than 1% Error Over Lifetime of the Battery Supports the Smart Battery Specification SBS V1.
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bq20z95 SLUS757C – JULY 2007 – REVISED OCTOBER 2013 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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bq20z95 www.ti.com SLUS757C – JULY 2007 – REVISED OCTOBER 2013 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.
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bq20z95 SLUS757C – JULY 2007 – REVISED OCTOBER 2013 www.ti.com TERMINAL FUNCTIONS (continued) TERMINAL I/O (1) DESCRIPTION VC3 IA, P Cell voltage sense input and cell balancing input for the positive voltage of the second lowest cell in cell stack and the negative voltage of the second highest cell in 4-series cell applications.
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bq20z95 www.ti.com SLUS757C – JULY 2007 – REVISED OCTOBER 2013 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) PARAMETER PIN MIN VSS Supply voltage VCC, VBAT 4.5 V(STARTUP) Minimum startup voltage VCC, BAT, PACK 5.5 VIN Input Voltage Range NOM MAX UNIT 25 V V VC(n) – VC(n+1); n = 1,2,3,4 0 5 V VC1, VC2, VC3, VC4 0 VSUP V VC5 0 0.5 V –0.5 0.
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bq20z95 SLUS757C – JULY 2007 – REVISED OCTOBER 2013 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 tWDWT TEST CONDITIONS Watchdog detect time MIN TYP MAX UNIT 50 100 150 µs 2.41 2.5 2.59 V 2.
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bq20z95 www.ti.com SLUS757C – JULY 2007 – REVISED OCTOBER 2013 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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bq20z95 SLUS757C – JULY 2007 – REVISED OCTOBER 2013 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 MIN Offset error (4) Offset error drift (4) TA = 25°C to 85°C Full-scale error (5) Full-scale error drift TYP MAX 140 250 µV 2.5 18 μV/°C ±0.
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bq20z95 www.ti.com SLUS757C – JULY 2007 – REVISED OCTOBER 2013 DATA FLASH CHARACTERISTICS (Over Recommended Operating Temperature and Supply Voltage) (continued) Typical Values at TA = 25°C and V(REG25) = 2.
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bq20z95 SLUS757C – JULY 2007 – REVISED OCTOBER 2013 TLOW SCLK www.ti.com TR THD:STA TF THIGH THD:DAT THD:STA TSU:STA TSU:STO TSU:DAT SDATA TBUF P S S P Start Stop TLOW:SEXT SCLK ACK† SCLK ACK† TLOW:MEXT TLOW:MEXT TLOW:MEXT SCLK SDATA A. SCLKACK is the acknowledge-related clock pulse generated by the master. Figure 1.
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bq20z95 www.ti.com SLUS757C – JULY 2007 – REVISED OCTOBER 2013 FEATURE SET Primary (1st Level) Safety Features The bq20z95 supports a wide range of battery and system protection features that can easily be configured.
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bq20z95 SLUS757C – JULY 2007 – REVISED OCTOBER 2013 www.ti.com Power Modes The bq20z95 supports three power modes to reduce power consumption: • • • In NORMAL mode, the bq20z95 performs measurements, calculations, protection decisions and data updates in 1-s intervals. Between these intervals, the bq20z95 is in a reduced power stage. In SLEEP mode, the bq20z95 performs measurements, calculations, protection decisions, and data updates in adjustable time intervals.
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bq20z95 www.ti.com SLUS757C – JULY 2007 – REVISED OCTOBER 2013 COMMUNICATIONS The bq20z95 uses SMBus v1.1 with MASTER mode and package error checking (PEC) options per the SBS specification. SMBus On and Off State The bq20z95 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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bq20z95 SLUS757C – JULY 2007 – REVISED OCTOBER 2013 www.ti.com Table 2. SBS COMMANDS (continued) SBS Cmd Mode Name Format Size in Bytes Min Value Max Value Default Value Unit 0x2f R/W Authenticate String 20+1 — — — ASCII 0x3c R CellVoltage4 unsigned int 2 0 65535 — mV 0x3d R CellVoltage3 unsigned int 2 0 65535 — mV 0x3e R CellVoltage2 unsigned int 2 0 65535 — mV 0x3f R CellVoltage1 unsigned int 2 0 65535 — mV Table 3.
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bq20z95 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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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 BQ20Z95DBTR 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) BQ20Z95DBTR 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 JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.