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.