BQ78Z100 Impedance Track™ Battery Fuel (Gas) Gauge for 1-Series to 2-Series | TI.com

BQ78Z100 (ACTIVE) Impedance Track™ Battery Fuel (Gas) Gauge for 1-Series to 2-Series

 

Description

The bq78z100 device provides a fully integrated pack-based solution with a flash programmable custom reduced instruction-set CPU (RISC), safety protection, and authentication for 1-series to 2-series cell Li-Ion and Li-Polymer battery packs.

The bq78z100 gas gauge communicates via an I2C-compatible interface or single-wire HDQ interface and combines an ultra-low-power, high-speed TI bqBMP processor, high-accuracy analog measurement capabilities, integrated flash memory, an array of peripheral and communication ports, an N-channel FET drive, and a SHA-1 Authentication transform responder into a complete, high-performance battery management solution.

The bq78z100 device provides an array of battery and system safety functions, including overcurrent in discharge, short circuit in charge, and short circuit in discharge protection for the battery, as well as FET protection for the N-channel FETs, internal AFE watchdog, and cell balancing. Through firmware, the devices can provide a larger array of features including protection against overvoltage, undervoltage, overtemperature, and more.

Features

  • High-Accuracy Coulomb Counter with Input Offset
    Error < 1 µV (Typical)
  • High-Side FET Drive Allows Serial Bus
    Communication During Fault Conditions
  • Analog Front End with Two Independent ADCs
    • Support for Simultaneous Current and Voltage
      Sampling
  • Bus Communications Interface Options
    • I2C
    • HDQ
  • SHA-1 Hash Message Authentication Code
    (HMAC) Responder for Increased Battery Pack
    Security
    • Split Key (2 × 64) Stored in Secure Memory
  • Programmable Protection Levels for:
    • Overcurrent in Discharge
    • Short-Circuit Current in Charge
    • Short-Circuit Current in Discharge
    • Overvoltage
    • Undervoltage
    • Overtemperature
  • Supports a 1-mΩ to 3-mΩ Current Sense Resistor
  • Compact 12-Terminal SON Package (DRZ)

Parametrics

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Part number Order Number of series cells Cell chemistry Battery capacity (Max) (mAh) Communication interface Battery capacity (Min) (mAh) External capacity indication Implementation Gas gauge algorithm Cell balancing Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ78Z100 Order now 1-2 Cells     Li-Ion/Li-Polymer     14000     HDQ     100     None     Pack     Impedance Track     External
Internal    
Cell Balancing
Integrated Protector
SHA-1 Authentication    
-40 to 85     SON | 12     12SON: 10 mm2: 2.5 x 4 (SON | 12)    
BQ27750 Order now Single Cell     Li-Ion/Li-Polymer
LiFePO4    
14000     I2C     100     None     Pack     Impedance Track         Accumulated Coulomb Count
Battery Management Unit
Integrated Protector
SHA-1 Authentication    
-40 to 85     SON | 12     12SON: 10 mm2: 2.5 x 4 (SON | 12)    
BQ28Z610 Order now 1-2 Cells     Li-Ion/Li-Polymer     14000     I2C     100     None     Pack     Impedance Track     External
Internal    
Battery Management Unit     -40 to 85     SON | 12     12SON: 10 mm2: 2.5 x 4 (SON | 12)    
BQ4050 Order now 2-4 Cells
Single Cell    
Li-Ion/Li-Polymer
LiFePO4    
29000     SMBus     500     LED     Pack     CEDV     External
Internal    
CEDV     -40 to 85     VQFN | 32     32VQFN: 16 mm2: 4 x 4 (VQFN | 32)    
BQ40Z50-R1 Order now 2-4 Cells
Single Cell    
Li-Ion/Li-Polymer
LiFePO4    
29000     SMBus     100     LED     Pack     Impedance Track     External
Internal    
Cell Balancing
Integrated Protector
SHA-1 Authentication
Turbo Mode    
-40 to 85     VQFN | 32     32VQFN: 16 mm2: 4 x 4 (VQFN | 32)