E98107A62C

The circuit was developed to manage the connection and communication between a microcontroller unit (MCU) and up to six sensor satellites. It can be applied for example in a vehicle passenger restraint system. The device provide two independently operating channels. Every channel manages the communication with a maximum of three sensor satellites.Each channel supplies the connected sensor devices with a regulated DC voltage, which is derived from an external source. The sensor data are extracted by measuring the current, modulated by the connected sensor devices, supplied by the regulator and communicated to the MCU via SPI interface. The current threshold is adapted to the quiescent current of the system. The data bits are coded using a Manchester format. The device operates with an external 4MHz/8MHz clock.

• Two independent operating channels
• Device parameters comply with PSI5-P10P-500/3L (PSI5 spec 1.3)
• Applicable for parallel and universal mode (standard) as well, as daisy chain mode (increased)
• Channel output short circuit protected against 40V and GND.
• Channel output short circuit protected against every other channel.
• Current detection with adapted current threshold
• Data Manchester coded
• Operation with supply voltages of 5V and 3.3V typical
• SPI interface
• Over current switch off for every channel
• Temperature switch off for every channel