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.
| 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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