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new products
Low Power’ MCU series.
The ML630Q46x MCUs have succeeded in clearing
±30kV, far exceeding the measurement instrument limit
of test voltage level 4 (±8kV indirect contact discharge)
of the IEC 61000-4-2*4 standard established by the
International Electrotechnical Commission (IEC).
[Measured using the ML630Q466 reference board.]
This enables stable operation even under harsh
environments.
Intersil Unveils Highly Integrated Multi-Cell
Battery Pack Monitor
Intersil, a subsidiary of Renesas Electronics Corporation
(TSE: 6723), today announced the ISL94202 3-to-8 cell
battery pack monitor that supports lithium-ion (Li-ion) and
other battery chemistries used in applications such as
vacuum cleaners, lawn equipment, handheld power tools,
e-bikes, scooters, toys, and energy storage systems. Li-ion
batteries are smaller, weigh less, and deliver longer battery
life than other battery chemistries, but require monitoring
and protection for safe use. The highly integrated ISL94202
battery pack monitor enables ultra-small 2-terminal designs,
and accurately monitors, protects and cell balances
rechargeable battery packs to ensure safe operation and
charging.
The ISL94202 operates as a stand-alone battery protection
system using an internal state machine with five pre-
programmed modes for accurately balancing and controlling
each battery cell. It monitors and protects the battery pack
fromcatastrophiceventssuchashardware faults, short circuit
conditions, and cell voltage overcharge/over-discharge and
meets the UL2054, UL2271/72 and IEC62133 specified
pack safety requirements. Designers can program the
ISL94202 battery monitor’s protection settings to enable the
industry’s smallest, low-cost battery packs without requiring
an external microcontroller. If required, the ISL94202 can
also communicate with an external microcontroller via I2C
serial bus to provide additional fuel gauge measurements,
including state of charge and state of health information.
Precise fuel gauge status is provided by the device’s high-
side current measurement feature.
The ISL94202 integrates high-side charge/discharge FET
drive circuitry, which makes it easy to interface to tools or
electric motor equipment. The device also controls external
passive cell balancing switches to ensure good cell energy
matching while protecting the pack’s cell life from chronic
undercharging. In addition, the ISL94202 can withstand
factory pack assembly hot plug events, which greatly
simplifies manufacturing.
“The ISL94202 offers customers all the necessary front end
battery features to protect against catastrophic pack failure,”
said Philip Chesley, senior vice president of Precision
Products at Intersil. “Its innovative high-side FET control,
current monitoring and cell measurement delivers a small
footprint solution for efficient battery pack designs.”
Key features and specifications of the ISL94202
Eight cell voltage monitors support Li-ion CoO2, Li-ion
Mn2O4, and Li-ion FePO4 battery chemistries
Highest level of integration: cell voltage level shift, automatic
cell balance, 14-bit ADC, current sense monitor, power FET
control, and temperature sensor interface
Stand-alone pack control, no microcontroller required
Multiple cell voltage protection options up to 4.8V
Programmable detection/recovery times for overvoltage,
undervoltage, overcurrent and short circuit conditions
Configuration/calibration registers stored in EEPROM
Open battery connect detection
Integrated charge/discharge FET drive circuitry with built-in
charge pump supports high-side N-channel FETs
Cell balancing uses external FETs with device’s internal
state machine or external microcontroller
Operates over the -40°C to +85°C industrial temperature
range
Enters low power states when battery pack is not in use
The ISL94202 battery monitor is pin-compatible with the
popular ISL94203 device that supports separate charge/
discharge paths for higher-end 3-terminal battery packs.
They are both part of Intersil’s family of industrial battery
management solutions, including the ISL94208 4-to-6 cell
Li-ion battery management analog front end, and ISL94212
Li-ion battery manager IC, which supervises up to 12 series
connected cells, and is cascadable up to 14 devices or 168
78 l New-Tech Magazine Europe