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.

Product Details

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

NXP Product Longevity

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	360 mA peak (Tj = -40 °C to 125 °C)	360 mA peak (Tj = -40 °C to 125 °C)
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