STMicroelectronics

The L9690 is an advanced airbag system chip solution targeted for the global airbag market. High frequency power supply design optimizes system cost by using smaller and less expensive external components. All switching regulators operate at 2 MHz and all buck converters have integrated synchronous rectifiers. The reserve capacitor is electrically isolated from the boost regulator by integrated switches and external resistors, controlling in-rush current. A capacitor discharge switch is integrated to discharge the capacitor at shutdown. Low quiescent current permits the device to be directly connected to battery. In this mode, device start-up and shutdown are controlled through the wake-up input pin (actually, shutdown needs also dedicated SPI command too). The power supply and crossover function are controlled automatically through the internal state machine. For systems with high feature content, two L9690 devices can be used in a master/slave configuration. The L9690 provides two fully isolated deployment voltage regulators, using the external safing FETs as power elements in the regulator loop. Deployment voltage is set to a nominal 18V value to further optimize system cost. Integrated safing logic uses a rolling average algorithm and decodes all sensor information within the system remote sensor SPI bus. Number of samples and thresholds are user-programmable. An alternative safing function permits arming from an external source through the Global SPI bus (E2E communication). Dual SPI interfaces separate device global functions and remote sensors. LIN interface is available, providing OCS message decoding for passenger loop inhibition.

The L9733 is a highly flexible monolithic, medium current, output driver that incorporates 8 outputs that can be used as either internal low or high-side drives in any combination. Outputs 1-8 are self-configuring as high or low-side drives. Self-configuration allows a user to connect a high or low-side load to any of these outputs and the L9733 will drive them correctly as well as provide proper fault mode operation with no other needed inputs. In addition, outputs 6, 7 and 8 can be PWM controlled via a external pins (IN6-8). This device is capable of switching variable load currents over the ambient range of -40 °C to +125 °C. The outputs are MOSFET drivers to minimize Vdd current requirements. For low-side configured outputs an internal zener clamp from the drain to gate with a breakdown of 50 V minimum will provide fast turn off of inductive loads. When a high-side configured output is commanded Off after having been commanded On, the source voltage will go to (VGND - 15 V). An 16 bit SPI input is used to command the 8 output drivers either "On" or "Off", reducing the I/O port requirement of the microcontroller. Multiple L9733 can be daisy-chained. In addition the SPI output indicates latched fault conditions that may have occurred.

The L9777 is a monolithic integrated low drop regulator which can supply up to 200 mA, available in the PowerSSO-12 package. It is designed to supply microprocessor systems under severe conditions of automotive applications and therefore equipped with additional protection functions against over load, short circuit and over temperature. Of course the L9777 can also be used in other applications where a regulated voltage is required.

The L9779WD is an integrated circuit designed for automotive environment and implemented in BCD6S technology. It is conceived to provide all basic functions for standard engine management control units. It is assembled in the HiQUAD-64 power package.

L9780 is an IC designed to interface a variety of wide range air fuel sensors. The device manages the oxygen pump of the wide range air fuel sensor by means of a voltage controlled current source (VCCS). The reference for the VCCS is generated by a PI controller with external compensation network in order to adapt the device to different sensors. The user can choose between two different networks using the SPI interface. L9780 is fully compatible with most sensors on the market. The internal timing state machine automatically manages all the operations needed for a right sequencing of the measurement process. All the main time values can be configured by SPI. L9780 drives also an external FET used to control the sensor heater. The device protects the sensor and all the I/O against shorts and provides the diagnosis by SPI.