1FEATURES

23• bq78PL116 Designed for Managing 3- to

16-Series-Cell Battery Systems

– Support for LCD and Electronic Paper

Displays or EPDs

– Configurable for 11-A, 26-A, or 110-A

Operating Currents

• Systems With More Than Four Series Cells

Require External bq76PL102 Dual-Cell

Monitors

• SmartSafety Features:

– Prevention: Optimal Cell Management

– Diagnosis: Improved Sensing of Cell

Problems

– Fail Safe: Detection of Event Precursors

• Rate-of-Change Detection of All Important Cell

Characteristics:

– Impedance

– Cell Temperature

• PowerPump Technology Transfers Charge

Efficiently From Cell to Cell During All

Operating Conditions, Resulting in Longer

Run Time and Cell Life

– Includes User-Configurable PowerPump

Cell-Balancing Modes

• High-Resolution 18-Bit Integrating Delta-Sigma

Coulomb Counter for Precise Charge-Flow

Measurements and Gas Gauging

• Multiple Independent Δ-Σ ADCs: One-per-Cell

Voltage, Plus Separate Temperature, Current,

and Safety

• Simultaneous, Synchronous Measurement of

Pack Current and Individual Cell Voltages

• Very Low Power Consumption

– < 400 μA Active, < 185 μA Standby, < 85 μA

Ship, and < 1 μA Undervoltage Shutdown

• Accurate, Advanced Temperature Monitoring

of Cells and MOSFETs With up to 4 Sensors

• Fail-Safe Operation of Pack Protection

Circuits: Up to Three Power MOSFETs and

One Secondary Safety Output (Fuse)

• Fully Programmable Voltage, Current, Balance,

and Temperature-Protection Features

• External Inputs for Auxiliary MOSFET Control

• Smart Battery System 1.1 Compliant via

SMBus

APPLICATIONS

• Portable Medical Instruments and Test

Equipment

• Mobility Devices (E-Bike)

• Uninterruptible Power Supplies and Hand-Held

Tools

DESCRIPTION

The bq78PL116 master gateway battery controller is

part of a complete Li-Ion control, monitoring, and

safety solution designed for large series cell strings.

The bq78PL116 along with bq76PL102 PowerLAN™

dual-cell monitors provide complete battery-system

control, communications, and safety functions for a

structure of three up to 16 series cells. This

PowerLAN system provides simultaneous,

synchronized voltage and current measurements

using one A/D per-cell technology. This eliminates

system-induced noise from measurements and allows

the precise, continuous, real-time calculation of cell

impedance under all operating conditions, even

during widely fluctuating load conditions.

PowerPump technology transfers charge between

cells to balance their voltage and capacity. Balancing

is possible during all battery modes: charge,

discharge, and rest. Highly efficient charge-transfer

circuitry nearly eliminates energy loss while providing

true real-time balance between cells, resulting in

longer run-time and improved cycle life.

Temperature is sensed by up to 4 external sensors and one on-chip sensor. This permits accurate temperature

monitoring of each cell individually. Firmware is then able to compensate for the temperature-induced effects on

capacity, impedance, and OCV on a cell-by-cell basis, resulting in superior charge/ discharge and balancing

control.

External MOSFET control inputs provide user- definable direct hardware control over MOSFET states. Smart

control prevents excessive current through MOSFET body diodes. Auxiliary inputs can be used for enhanced

safety and control in large multicell arrays.

The bq78PL116 is completely user-configurable, with parametric tables in flash memory to suit a variety of cell

chemistries, operating conditions, safety controls, and data reporting needs. It is easily configured using the

supplied bqWizard™ graphical user interface (GUI). The device is fully programmed and requires no algorithm or

firmware development.

The bq78PL116 pin functions of LED1/SEG1–LED5/SEG5, PSH/BP/TP, and FIELD support LED, LCD, and

electronic paper displays (EPDs). The user can configure the bq78PL116 for the desired display type.