Battery Junction Box Monitor IC
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The MC33777A is a battery junction box controller IC designed for automotive applications such as hybrid electric vehicles (HEV), electric vehicles (EV), and industrial applications (ESS).
The device can drive two pyrotechnic switches independently and includes an extensive set of diagnostics.
The device measures redundantly currents, voltages, and temperatures. It processes the results and detects fault events (short circuit, system overload, crash signals...). These events can be combined and used to trigger reactions without a microcontroller (GPIOs, pyrotechnic switch).
The device offers an isolated daisy chain (TPL3) or a Serial Peripheral Interface (SPI) for communication with the MCU. The MC33777A allows reaching the highest automotive safety integrity level (ASIL D) with all its features.
Product Details
Features
Current Measurement
- Four current measurement channels (supporting two ASIL D current measurements)
- Per channel, one precise measurement branch and one fast measurement branch
- Shunt temperature drift compensation based on external temperature sensor
- Overcurrent detection (threshold, di/dt calculation, melting fuse emulation)
Voltage and General-Purpose Measurements
- 16 analog inputs supporting redundant measurements
Decision Engine Event Manager
- Configurable decision engine to assess measurement inputs and trigger reactions
- Set of event signals (ex: high di/dt, overcurrent, overvoltage, overtemperature...)
- Triggering reactions (ex: Pyrotechnic Switch controller, MCU wake-up, GPIOs...)
Pyrotechnic Switch Controller
- Two independent controllers including driver stage
- AK-LV 16 (2012-07) compliant
- Triggering by the decision engine event manager without MCU processing
- Extensive set of diagnostics (diagnostic current, capacitor measurement, ESR measurement...)
Communication
- SPI interface and I²C interface
- MCU interface supporting SPI or TPL3
Design Resources
Software
Quick reference to our software types.
1 software file
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Simulation and Modeling Tools
Model-Based Design Toolbox (MBDT)
Note: For better experience, software downloads are recommended on desktop.