Renesas ISL78714 User Manual
ISL78714
Automotive Grade Multi-Cell Li-Ion Battery Manager
Data Short
To request the full datasheet, visit the ISL78714 device page.
The ISL78714
manager IC supervises up to 14 series connected
cells and is optimized to meet stringent automotive
performance, reliability, and safety requirements. The
device provides all the functions expected of such a
critical component in a battery management system,
such as accurate cell voltage and temperature
monitoring, cell balancing, and extensive system
diagnostics.
In a typical configuration, a Master ISL78714
communicates to a host microcontroller through an
SPI port and up to 29 additional ISL78714 devices
connected together by a robust, proprietary, two-wire
Daisy Chain. This communication system is highly
flexible and can be implemented with capacitor
isolation, transformer isolation, or a combination of
both.
Three cell balancing modes are included: Manual
Balance mode, Timed Balance mode, and Auto
Balance mode. Auto Balance mode terminates
balancing after a host-specified amount of charge has
been removed from every cell.
The ISL78714 is packaged in a 64 pin TQFP and is
specified for operation from -40ºC to +105ºC.
automotive grade Li-ion battery
Applications
• Hybrid Electric Vehicle (HEV), Plug-in Hybrid
Electric Vehicle (PHEV), and Electric Vehicle (EV)
battery packs
• Electric motorcycle battery packs
• Backup battery and energy storage systems
requiring high accuracy management and
monitoring
• Portable and semi-portable equipment
Related Literature
For a full list of related documents, visit our website:
• ISL78714
device page
Features
• Monitors and manages up to 14 cells; all standard
Li-Ion cell chemistries
• Supports ASIL D systems
• Robust two-wire Daisy Chain communications
system using capacitor or transformer coupling at
up to 1Mbps
• High security communications protocol per
ISO26262
• Cell voltage measurement accuracy
1.65V to 4.28V; -20ºC to +85ºC:
○ Initial Device accuracy: ±2mV
○ Post board assembly Device accuracy: ±2.5mV
• Cell input range: ±5.0V, negative voltages ideal for
bus bars
• Up to six external temperature monitoring inputs
• Internal temperature monitoring with warning flag
• Two general purpose I/O pins
• Automatic sensing of position in battery stack
• Measures and performs read-back on all voltages,
temperatures, and diagnostics for 112 cells in less
than 10ms
• User-selectable cell measurement averaging
function
• 14-bit voltage and temperature measurements
• Integrated system diagnostics for all key functions
• Watchdog shuts down device if communication is
lost
• Pb-free (RoHS compliant)
• Long term drift: -0.31 log(khrs)
• Fully tolerant to EMC and transients
FN8765 Rev.1.3 Page 1 of 2
Feb 18, 2021 © 2019 Renesas Electronics
ISL78714
ISL78714
DHi1
DLo1
VG2
VG2
VC14
VC13
VC12
VC11
VC10
VC9
VC8
VC7
VC6
VC5
VC4
VC3
VC2
VC1
VC0
VSS
VBAT
PACK
ISL78714
DHi2
DLo2
To Other Devices
Monitor Board Monitor Board
DHi2
DLo2
VG1
VG1
VG1
SPI
VC14
VC13
VC12
VC11
VC10
VC9
VC8
VC7
VC6
VC5
VC4
VC3
VC2
VC1
VC0
VSS
VBAT
(Optional)
PAC K
Host
Micro
(Daisy Chain - Optional)(Master or Stand-Alone)
14 Cells
14 Cells
Up to 30 total
Figure 1. Typical Application
FN8765 Rev.1.3 Page 2 of 2
Nov 19, 2020
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