14 Channel Li-Ion Battery Cell Controller IC ASIL D

MC33775 Active

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The MC33775A is 14 cell lithium-ion battery cell controller IC designed for automotive applications, such as hybrid and electric vehicle (HEV/EV) and industrial applications, such as energy storage system (ESS).

The device measures differential high-precision cell voltages as well as temperatures. It offers ASIL D support for cell voltage, module voltage and temperature measurements. Additionally, the device provides an extensive set of passive cell voltage balancing features to equalize the individual cell voltages across the battery stack. The device offers serial peripheral interface (SPI) and an isolated daisy chain interface for communication with the host MCU.

Block Diagram

MC33775 Block Diagram

MC33775 Block Diagram
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Features

General Features

  • From 4 to 14 cells per device
  • ISO 26262 ASIL D support for cell voltage, module voltage and temperature measurements
  • External temperature and auxiliary voltage measurements
  • Module voltage measurement
  • On-board passive cell balancing
    • Up to 300 mA balancing MOSFETs with diagnostics
    • Simultaneous balancing
    • Timer, voltage, temperature, PWM-controlled balancing
  • Isolated daisy chain 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 MC33775 is included in the 15-year program

Comparison Table

Parameter MC33771B MC33771C MC33775
Voltage Channels 7..14 7..14 4..14
Supply VRange (Max) 9.6 V..61.6 V (75 V) 9.6 V..61.6 V (75 V) 9.6 V..65 V (75 V)
Cell Input Voltage Range -0.3 V to 5 V -0.3 V to 5 V -5 V to 5 V
Measurement Error ± 0.8 mV (Vcell =3.3 v Ta = 25°c) ± 0.8 mV (Vcell =3.3 v Ta = 25°c)
Total Measurement Error
(After aging: MLS3 and 1000h HTOL)		 ± 3.9 mV ± 3.9 mV ± 3.9 mV
Vpwr=9.6 V..61.6 V,
Vcell=1.5 V..4.3 V, -40~85°C		 Vpwr=9.6 V..61.6 V,
Vcell=1.5 V..4.3 V, -40°C..85°C		 Vpwr=9.6 V..65 V,
Vcell=1.5 V..4.5 V, -40°C..115°C
Measurement Averaging No Configurable Averaging Dynamic
Averaging
samples
Functional Safety ASIL C
ASIL D Compliance 		ASIL C
ASIL D Compliance 		Redundant
Architecture,
single-chip Cell
Voltage and Temp.
ASIL D
Isolated Communication Speed 2 Mbps 2 Mbps 2 Mbps
Communication Isolation Inductive Inductive, Capacitive Inductive, Capacitive
Max Nodes per Daisy Chain 15 63 62
CRC Bit 8 8 16
Comms Bit 40 48 64...1112
Integrated Balancing <300 mA, Timer <300 mA, Timer <300 mA, Timer
Balancing Sleep Mode Yes Yes Yes
GPIO / Analog Measurement Inputs 7 7 8
I²C Controller EEPROM Only EEPROM Only Full I²C leader
Current Channels 1 1 No
Coulomb Counter 1 1 No
Package 64-pin LQFP-EP 64-pin LQFP-EP 64-pin LQFP-EP

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