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The bq20z75 SBS-compliant gas gauge and protection IC is a single IC solution designed for battery-pack or in-system installation. The bq20z75 measures and maintains an accurate record of available charge in Li-ion or Li-polymer batteries using its integrated high-performance analog peripherals, monitors capacity change, battery impedance, open-circuit voltage, and other critical parameters of the battery pack as well and reports the information to the system host controller over a serial-communication bus. Together with the integrated analog front-end (AFE) short-circuit and overload protection the bq20z75 maximizes functionality, safety and minimize external component count, cost and size in smart battery circuits.
The implemented Impedance Track™ gas gauging 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 with high accuracy.
BQ20Z75 Maximum Ratings
DESCRIPTION
PIN
UNIT
VMAX
VIN
Supply voltage range
VBAT, VCC
0.3V to 34V
Input voltage range
PACK, PMS
0.3V to 34V
VC(n)-VC(n+1); n = 1,2, 3, 4
0.3V to 8.5V
VC1, VC2, VC3, VC4
0.3V to 34V
VC5
0.3V to 1.0V
PFIN, SMBD, SMBC,DISP
0.3V to 6.0V
TS1, TS2, VCELL+,PRES; ALERT
0.3 V to V REG25 + 0.3 V
MRST, GSRN, GSRP,RBI
0.3 V to V REG25 + 0.3 V
ASRN, ASRP
1.0V to 1.0V
VOUT
Output voltage range
DSG, CHG, GPOD
0.3V to 34V
ZVCHG
0.3V to V BAT
TOUT, ALERT,REG33,
0.3 V to 6.0V
RESET
0.3 V to 7.0V
REG25, SAFE, TOUT
0.3V to 2.75V
ISS
Maximum combined sink current for input pins
PRES, PFIN, SMBD,SMBC
50mA
TA
Operating free-air temperature range
40°C to 85°C
TF
Functional temperature
40°C to 100°C
Tsld
Storage temperature range
65°C to 150°C
Tsld
Lead temperature (soldering, 10s)
300°C
(1) 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.
BQ20Z75 Features
` 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 Instant Accuracy No Learning Cycle Required ` Supports the Smart Battery Specification SBS V1.1 ` Flexible Configuration for 2 to 4 Series Li-Ion and Li-Polymer Cells ` Powerful 8-Bit RISC CPU With Ultra-Low Power Modes ` Full Array of Programmable Protection Features Voltage, Current and Temperature ` Supports SHA-1 Authentication ` small 38-Pin TSSOP (DBT) Package
BQ20Z75 Typical Application
· Notebook PCs · Medical and Test Equipment · Portable Instrumentation