MAX11068EVKIT Maxim Integrated Products, MAX11068EVKIT Datasheet - Page 15

• Manufacturer Part Number: MAX11068EVKIT
• Description: KIT SMART BATT MEASUREMENT 12CH
• Manufacturer: Maxim Integrated Products

Specifications of MAX11068EVKIT

• Main Purpose: Power Management, Battery Monitor, Car
• Utilized Ic / Part: MAX11068
• Primary Attributes: Monitors Current, Voltage, Temperature
• Secondary Attributes: 1 ~ 12 Cell- Li-Ion, 1 ~ 12 Cell- NiMH
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Embedded: -

Battery packs are designed in a modular fashion to allow
for multiple configurations, and fast and flexible assem-
bly. This reduces cost by streamlining the build or repair
process. The definition of a battery pack is a system
comprising one or more battery modules connected in
either a series or matrix configuration to create a high-
voltage power source. Transportation or high-power
battery-backup-system applications typically use many
series-connected battery modules to generate voltages
of up to several hundred volts. This voltage can then be
inverted and transformed to levels suitable for the given
load. A battery module is a series of cells configured as
a subsystem that can be combined with other modules
to build a high-voltage pack. For the MAX11068, the
minimum cell count per module is limited by the 6.0V
input requirement of the regulator, while the maximum
cell count is 12. The 6.0V minimum requirement usually
limits configurations to at least two lithium-ion (Li+), six
NiMH, or six SuperCap cells per module. Figure 6 is the
module system with redundant fault-detection applica-
tion schematic.
Battery packs used in transportation applications may
be composed of various battery technologies (NiMH,
Li+, SuperCap, or lead acid) and typically include an
electronic battery-management system (BMS), envi-
ronment control, and several safety features. Figure 7
shows the electric vehicle system (EVS).
12-Channel, High-Voltage Sensor, Smart
Battery Pack Architectures
Data-Acquisition Interface
In hybrid electric vehicles (HEVs), plug-in hybrid electric
vehicles (PHEVs), electric vehicles (EVs), or fuel-cell
vehicles (FCVs), cell counts can range from 36 cells to
200 cells using Li+ batteries and up to as high as 200 to
500 cells using NiMH batteries. SuperCaps are typically
used in fast-charge holding applications such as regen-
erative braking energy storage.
There are two fundamental battery-pack management
architectures that can be realized with the MAX11068:
U Distributed module communication
U SMBus-laddered module communication
A distributed module system deploys a point-to-point
connection from each battery module back to a master
microcontroller in the BMS. Because the battery mod-
ules operate from the high-voltage battery stack, galvan-
ic isolation must be used when communicating with the
master microcontroller. Figure 8 shows the distributed
communication battery pack.
An SMBus-laddered module system deploys a serial
communication bus that travels through each battery
module and is then accessed at one entry point in the
system by the master microcontroller in the BMS. The
SMBus ladder method reduces cost and requires at
most a single galvanic isolator between the high-voltage
batteries and the main power net. Galvanic isolation may
not be required in certain low-voltage applications. See
Figure 9.
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