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

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)

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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 BQ40Z60 BQ78350-R1
1-2 Cells    Single Cell    Single Cell    1-2 Cells    2-4 Cells
Single Cell   
2-4 Cells    >4 Cells   
Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer
LiFePO4   
Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer
LiFePO4   
Li-Ion/Li-Polymer
LiFePO4   
14000    14600    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
System   
Pack   
IT (High accuracy)    IT (High accuracy)    IT (High accuracy)    IT (High accuracy)    CEDV    IT (High accuracy)    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
Turbo Mode   
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   
Battery Management Unit
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   
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