General description

The 33771 is a SMARTMOS lithium-ion battery cell controller IC designed for automotive

applications, such as hybrid electric (HEV) and electric vehicles (EV) along with industrial

applications, such as energy storage systems (ESS) and uninterruptible power supply

(UPS) systems.

The device performs ADC conversions of the differential cell voltages and current, as well

as battery coulomb counting and battery temperature measurements. The information is

digitally transmitted through the Serial Peripheral Interface (SPI) or Transformer Isolation

(TPL) to a microcontroller for processing.

Features

• 9.6 V ≤ VPWR ≤ 63 V operation, 75 V transient

• 7 to 14 cells management

• Isolated 2.0 Mbps differential communication or 4.0 Mbps SPI

• Addressable on initialization

• 0.8 mV maximum total voltage measurement error

• Synchronized cell voltage/current measurement with coulomb count

• Total stack voltage measurement

• Seven GPIO/temperature sensor inputs

• 5.0 V at 5.0 mA reference supply output

• Automatic over/undervoltage and temperature detection routable to fault pin

• Integrated sleep mode over/undervoltage and temperature monitoring

• Onboard 300 mA passive cell balancing with diagnostics

• Hot plug capable

• Detection of internal and external faults, as open lines, shorts, and leakages

• Designed to support ISO 26262, up to ASIL D safety system

• Fully compatible with the MC33772 for a maximum of six cells

• Qualified in compliance with AEC–Q100

Applications

• Automotive: 48 V and high-voltage battery packs

• E-bikes, e-scooters

• Energy storage systems

• Uninterruptible power supply (UPS)