14-Channel Li-Ion Battery Cell Controller IC

MC33771C

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The MC33771C is a Li-Ion battery cell controller IC designed for automotive and industrial applications such as HEV, EV, ESS, UPS systems. Featuring:

  • ADC conversions on the differential cell voltages with averaging up to 256 samples and currents as well as coulomb counting and temperature measurements.
  • Embedded balancing transistors and diagnostics to simplify applications.
  • Support standard SPI and transformer isolated daisy chain communication (with MC33664) to an MCU for processing and control up to 63 nodes in one daisy chain.
  • Loopback support for one daisy chain

Block Diagram

MC33771 and MC33664 High-Voltage Battery Management System

MC33771 and MC33664 High-Voltage Battery Management System
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Features

Supply Voltage

  • 9.6 V ≤ VPWR ≤ 61.6 V operation, 75 V transient

Advanced Voltage and Temperature Measurement

  • 14 Cell Voltage Measurement Channels with integrated averaging possible up to 256 samples – (no averaging for MC33771B)
  • Total Stack Voltage Measurement
  • 0.8 mV maximum total voltage measurement error
  • 7 ADC/GPIO/Temperature Sensor Inputs

Synchronized Advanced Current Measurement

  • Integrated Current sensor with PGA
  • ±0.5% accuracy from milliamps to kiloamps
  • Integrated Coulomb Counter

Onboard Passive Balancing

  • Onboard 300mA Low Rdson passive cell balancing MOSFETs with diagnostics
  • Balancing in Sleep mode
  • Programmable balancing timer for each MOSFET

Isolated Daisy Chain or SPI Communication

  • 2.0 Mbps, 2 wire twisted pair differential, isolated
  • Inductive and capacitive coupling support –(only transformer coupling for MC33771B)
  • Up to 63 nodes in one daisy chain – (15 nodes for MC33771B)
  • Loopback support for 1 daisy chain – (no loopback capability for MC33771B)
  • Addressable on initialization
  • 4 Mbps SPI

Diagnostics, Functional Safety and Robustness

  • OV/UV, OT/UT, OC fault verification
  • Sleep mode OV/UV, OT/UT monitoring
  • Support ISO 26262, up to ASIL D safety capability
  • Hot plug capable and AEC Q-100

Product Longevity Program

  • This product is included in the NXP Product Longevity program ensuring a stable supply of products for your embedded designs. MC33771C is included in the 15-year program.

Part numbers include: MC33771CTA1AE, MC33771CTA2AE, MC33771CTP1AE, MC33771CTP2AE.

Comparison Table

Parameter MC33771B MC33771C MC33772B MC33772C
Voltage Channels 7..14 7..14 3..6 3..6
Supply VRange (Max) 9.6 V..61.6 V (75 V) 9.6 V..61.6V (75 V) 6 V..30 V (40 V) 6 V..30 V (40 V)
Cell Input Voltage Range -0.3 V to 5 V -0.3 V to 5 V -0.3 V to 5 V -0.3 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) ± 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 ± 3.9 mV
Vpwr=9.6V..61.6V,
Vcell=1.5V..4.3V, -40~85°C		 Vpwr=9.6V..61.6V,
Vcell=1.5V..4.3V, -40°C..85°C		 Vpwr=6V..30V,
Vcell=1.5V..4.3V, -40~85°C		 Vpwr=6V..30V,
Vcell=1.5V..4.3V, -40~85°C
Measurement averaging No Configurable Averaging
Samples 2n n=0..8, (1,2,4,..256)		 No Configurable Averaging
Samples 2n n=0..8, (1,2,4,..256)
Functional Safety ASIL C
ASIL D Compliance 		ASIL C
ASIL D Compliance 		ASIL C
ASIL D Compliance 		ASIL C
ASIL D Compliance
Isolated communication Speed 2 Mbps 2 Mbps 2 Mbps 2 Mbps
Communication Isolation Inductive Inductive, Capacitive Inductive Inductive, Capacitive
Max Nodes per Daisy Chain 15 63 15 63
CRC Bit 8 8 8 8
Comms bit 40 48 40 48
Integrated Balancing <300 mA, Timer <300 mA, Timer <300 mA, Timer <300 mA, Timer
Balancing sleep mode Yes Yes Yes Yes
GPIO / Analog measurement inputs 7 7 7 7
I2C Controller EEPROM Only EEPROM Only EEPROM Only EEPROM Only
Current Channels 1 1 1 1
Coulomb counter 1 1 1 1
Package 64-pin LQFP-EP (-40~105°C) 64-pin LQFP-EP (-40~105°C) 48-pin LQFP-EP (-40~105°C) 48-pin LQFP-EP (-40~105°C)

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