The MC33774 is an 18-Channel battery cell controller IC designed for the most demanding applications. The IC is lifetime qualified for less than 2 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 300 mA per channel. An I2C interface allows to control external devices, e.g.. EEPROMs. Up to 62 devices can be daisy-chained via the isolated ETPL bus.
| Parameter | MC33775 | MC33774 |
|---|---|---|
| Voltage Channels | 4..14 | 4..18 |
| Supply V Range (Max) | 9.6 V..65 V (75 V) | 9 V..81 V (84 V) |
| Cell Input Voltage Range | -5 V to 5 V | -5 V to 5 V |
| Measurement Error (Before aging) | ± 2 mV | ± 1 mV |
| Vpwr = 9.6 V..65 V | Vpwr = 9 V..81 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 aging: MLS3 and 1000h HTOL) |
± 3.9 mV | ± 2 mV |
| Vpwr=9.6 V..65 V | Vpwr=9 V..81 V | |
| Vcell=0 V..4.5 V, -40 °C..85 °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 | <300 mA, Timer | <150 mA average, Timer |
| Balancing Sleep Mode | Yes | Yes |
| GPIO / Analog Measurement Inputs | 8 | 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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