Details, datasheet, quote on part number: BQ20Z70
PartBQ20Z70
CategoryPower Management => Battery Management
DescriptionSBS 1.1 Compliant Gas Gauge Enabled w/Impedance Track Tech For bq29330
The bq20z70 SBS-compliant gas gauge IC, incorporating patented Impedance Track™ technology, is designed for battery-pack or in-system installation. The bq20z70 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z70 monitors capacity change, battery impedance, open-circuit voltage, and other critical parameters of the battery pack, and reports the information to the system host controller over a serial-communication bus. It is designed to work with the bq29330 analog front-end (AFE) protection IC to maximize functionality and safety, and minimize component count and cost in smart battery circuits.

The Impedance Track technology continuously analyzes the battery impedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to be calculated with discharge rate, temperature, and cell aging all accounted for during each stage of every cycle.
CompanyTexas Instruments, Inc.
DatasheetDownload BQ20Z70 datasheet
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Features, Applications

SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACKTM TECHNOLOGY FOR USE WITH THE bq29330
FEATURES

Next Generation Patented Impedance TrackTM Technology accurately Measures Available Charge in Li-Ion and Li-Polymer Batteries Better than 1% Error Over Lifetime of the Battery Instant Accuracy ­ No Learning Cycle Required Supports the Smart Battery Specification SBS V1.1 Powerful 8-Bit RISC CPU With Ultra-Low Power Modes Works With the TI bq29330 Analog Front-End (AFE) Protection IC to Provide Complete Pack Electronics Solution Full Array of Programmable Protection Features ­ Voltage, Current and Temperature Fully Integrated High Accurate Clock Flexible Configuration for to 4 Series Li-Ion and Li-Polymer Cells Integrated Field Programmable FLASH Memory Eliminates the Need for External Configuration Memory Smart Battery Charger Control Feature Two 16-Bit Delta-Sigma Converter ­ Accurate Voltage and Temperature Measurements ­ Integrating Coloumb Counter for Charge Flow Better Than 0.65 nVh of Resolution Self-Calibrating Supports SHA-1 Authentication 20-Pin TSSOP (PW)

APPLICATIONS
Notebook PCs Medical and Test Equipment Portable Instrumentation
DESCRIPTION

The bq20z70 SBS-compliant gas gauge IC, incorporating patented Impedance TrackTM technology, is designed for battery-pack or in-system installation. The bq20z70 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals. The bq20z70 monitors capacity change, battery impedance, open-circuit voltage, and other critical parameters of the battery pack, and reports the information to the system host controller over a serial-communication bus. It is designed to work with the bq29330 analog front-end (AFE) protection IC to maximize functionality and safety, and minimize component count and cost in smart battery circuits. The Impedance Track technology continuously analyzes the battery impedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to be calculated with discharge rate, temperature, and cell aging all accounted for during each stage of every cycle. AVAILABLE OPTIONS

PACKAGE 85°C 20-PIN TSSOP (PW) Tube (1) 20-PIN TSSOP (PW) Tape & Reel bq20z70PWR (2)
A single tube quantity is 50 units. 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. IMPEDANCE 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.

Temperature Measurement & Protection 32kHz Clock Generator bq29330 Validation & Control System Interface

LDO & Therm. Drive & Reset Watchdog & Protection Timing
Cell & Pack Voltage Measurement Impedance TrackTM Gas Gauging
Voltage Level Translator Overcurrent & Short Circuit Protection

TERMINAL NO. NAME XALERT TS2 TS1 CLKOUT PRES PFIN SAFE SMBD NC SMBC SDATA SCLK VSS SRP SRN MRST VSS VCC VCELL+ VCELLI/O (1) I/OD ­ I/OD IA DESCRIPTION Alert interrupt input from bq29330. Connect directly to bq29330 XALERT pin 2nd thermistor voltage input connection to monitor temperature 1st thermistor voltage input connection to monitor temperature 32.768kHz output for bq29330 watchdog. Connect directly to bq29330 WDI pin Active low input to sense system insertion Active low input to sense secondary protector output status Active high output to enforce additional level of safety, e.g. fuse blow SMBus data open drain bidirectional pin used for communication with bq20z70 Not used - leave floating SMBus clock open drain bidirectional pin used for communication with bq20z70 Data transfer line from and to bq29330. Connect directly to SDATA pin of bq29330 Data clock line to bq29330. Connect directly to SCLK pin of bq29330 VSS Connection for a small-value resistor to monitor the battery charge and discharge current flow Connection for a small-value resistor to monitor the battery charge and discharge current flow Master reset input that forces the device into reset when held low. Connect directly to XRST pin of bq29330 Negative supply. Both VSS needs to be connected together Positive supply Positive differential cell input. Connect directly to CELL+ pin of bq29330 Negative differential cell input. Connect directly to CELL- pin of bq29330

I = Input, IA = Analog input, I/O = Input/output, I/OD = Input/Open-drain output, O = Output, OA = Analog output, P = Power

over operating free-air temperature range (unless otherwise noted) (1)

RANGE VCC relative to VSS (2) V(IOD) relative to VSS (2) VI relative to VSS (2) TA Tstg (1) (2) Supply voltage range on VCC pin XALERT, PFIN, SAFE, SMBD, SMBC, SDATA, SCLK, TS2, TS1, CLKOUT, PRES, SRP, SRN, MRST, VCELL+,VCELLOperating free-air temperature range Storage temperature range V to VCC to 150°C

Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. VSS refers to Voltage at VSS pin.

PARAMETER VDD IDD Supply voltage Operating mode current TEST CONDITIONS VDDA and VDDD No flash programming + bq29330 Sleep mode + bq29330 MIN 2.4 TYP MAX 2.6 UNIT V µA

This value does not include the bq29330 Submit Documentation Feedback 3

 

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