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

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

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)

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Parametrics Compare all products in Battery Fuel Gauge

 
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)
Pin/Package
BQ78Z100 BQ27542-G1 BQ27750 BQ28Z610 BQ4050 BQ40Z50-R1 BQ78350-R1
1-2 Cells     Single Cell     Single Cell     1-2 Cells     2-4 Cells
Single Cell    
2-4 Cells
Single Cell    
>4 Cells    
Li-Ion/Li-Polymer     Li-Ion/Li-Polymer     Li-Ion/Li-Polymer
LiFePO4    
Li-Ion/Li-Polymer     Li-Ion/Li-Polymer
LiFePO4    
Li-Ion/Li-Polymer
LiFePO4    
Li-Ion/Li-Polymer
LiFePO4    
14000     32000     14000     14000     29000     29000     320000    
HDQ     HDQ
I2C    
I2C     I2C     SMBus     SMBus     I2C
SMBus    
100     100     100     100     500     100     100    
None     None     None     None     LED     LED     LCD
LED
SOC    
Pack     Pack     Pack     Pack     Pack     Pack     Pack    
Impedance Track     Impedance Track     Impedance Track     Impedance Track     CEDV     Impedance Track     CEDV    
External
Internal    
N/A     N/A     External
Internal    
External
Internal    
External
Internal    
External
Internal    
Cell Balancing
Integrated Protector
SHA-1 Authentication    
SHA-1 Authentication     Accumulated Coulomb Count
Battery Management Unit
Integrated Protector
SHA-1 Authentication    
Battery Management Unit
Cell Balancing
Integrated Protector
SHA-1 Authentication    
Cell Balancing
Integrated Protector
SHA-1 Authentication    
Cell Balancing
Integrated Protector
SHA-1 Authentication
Turbo Mode    
Cell Balancing
Integrated Protector
SHA-1 Authentication    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
12SON     12SON     12SON     12SON     32VQFN     32VQFN     30TSSOP