18 Channel Li-Ion Battery Cell Controller IC ASIL D

MC33774

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The MC33774 is an 18-Channel battery cell controller IC designed for the most demanding applications. The IC is lifetime qualified for less than 1.5 mV of voltage measurement error over the full temperature and cell voltage range. A fully redundant and independent internal architecture enables achieving ASIL D Functional Safety targets at cells voltage as well as for cells temperature measurements. Busbar monitoring is supported thanks to an input voltage ranging down to -3 V.

Configurable on-chip averaging of the high frequency voltage measurement signals acts as a digital filter and allows for a reduction in external filtering. Highly advanced functions are available to control passive cell balancing with up to 300mA per channel and all the way up to 125 degree C. ambient temperature. It gives the possibility for maximizing the assets utilization (e.g. ESS and EV Fleet) via fast real-time balancing. An I2C interface allows to control external devices, e.g.. EEPROMs. Up to 62 devices can be daisy-chained via the isolated ETPL bus.

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Block Diagram

MC33774

MC33774 Block Diagram
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Features

Key Features

  • From 4 to 18 cells per device
  • ISO 26262 ASIL D support for cell voltage and temperature measurements
  • External temperature and auxiliary voltage measurements
  • On-board passive cell balancing
    • Up to 300 mA average cell balancing with diagnostics
    • Automatic odd/even balancing sequence
    • Timer, voltage, temperature, PWM-controlled balancing
    • Low Integrated Balancing MOSFET RdsON
  • Isolated daisy chain up to 62 nodes or SPI communication
  • Diagnostics, functional safety and robustness

Product Longevity Program

    This product is included in the NXP Product Longevity program ensuring a stable supply of products for your embedded designs. The MC33774 is included in the 15-year program

Part numbers include: MC33774ASA1AE, MC33774ASP1AE, MC33774ATA1AE, MC33774ATP1AE.

Comparison Table

Parameter 18-channel BCC, Advanced (MC33774ATA) 18-channel BCC, Premium (MC33774ATP)
Voltage Channels 4..18 4..18
Supply V Range (Max) 9 V..81 V (84 V) 9 V..90 V (94 V)
Cell Input Voltage Range -3 V to 5 V -3 V to 5 V
Measurement Accuracy ± 1 mV ± 0.8 mV
Vpwr = 9 V..81 V Vpwr = 9 V..90 V
Vcell=0 V..3.7 V, -40 °C..85 °C Vcell=0 V..3.7 V, -40 °C..85 °C
Total Measurement Error after Lifetime ± 2 mV ± 1.5 mV
Vpwr=9 V..81 V Vpwr=9 V..90 V
Vcell=0 V..4.5 V, -40 °C..115 °C Vcell=0 V..4.5 V, -40 °C..115 °C
Measurement Averaging Dynamic Dynamic
Averaging Averaging
Samples Samples
Functional Safety Redundant Architecture Redundant Architecture
Single-Chip Cell Single-Chip Cell
Voltage and Temp. Voltage and Temp.
ASIL D ASIL D
Isolated Communication Speed 2 Mbps 2 Mbps
Communication Isolation Inductive, Capacitive Inductive, Capacitive
Max Nodes per Daisy Chain 62 62
CRC Bit 16 16
Comms Bit 64...112 64...112
Integrated Balancing 300mA peak 300mA peak
Balancing Sleep Mode Yes Yes
Integrated Balancing MOSFET (maximum RdsON) 1.1 ohm 1.1 ohm
GPIO / Analog Measurement Inputs 9 9
I2C Controller Full I2C leader Full I2C leader
Current Channels No No
Coulomb Counter No No
Package 64-pin LQFP-EP 64-pin LQFP-EP

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