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Wafer level automotive camera module boasts lowest power consumption

Mon, Jun 15, 2020

For driver monitoring systems in vehicles, OmniVision offers what is claimed to be the first automotive wafer level camera module. The reflowable OVM9284 CameraCubeChip is a 1Mpixel module which measures 6.5 x 6.5mm. It is claimed to provide maximum flexibility regarding placement within the cabin while remaining hidden from view. It also has, says OmniVision, the lowest power consumption among automotive camera modules; over 50 per cent lower than the nearest competitor.

The OVM9284 is built on OmniVision’s OmniPixel 3-GS global-shutter pixel architecture, which provides best quantum efficiency at the 940nm wavelength for high quality driver images in near or total darkness. The integrated OmniVision image sensor has a three micron pixel and a ¼ inch optical format, along with

1280 x 800 resolution.

Driver monitoring systems (DMS) is expected to be the next growth area for ADAS cameras to address driver distraction.

“Most existing DMS cameras use glass lenses, which are large and difficult to hide from drivers to avoid distraction, and are too expensive for most car models,” said Aaron Chiang, marketing director at OmniVision. “Our OVM9284 CameraCubeChip module is the world’s first to provide automotive designers with the small size, low power consumption and reflowable form factor of wafer-level optics,” he added.

The OVM9284’s integration of OmniVision’s image sensor, signal processor and wafer-level optics in a single compact package reduces the complexity of dealing with multiple vendors, and increases supply reliability while speeding development time. Furthermore, unlike traditional cameras, CameraCubeChip modules are reflowable. This means they can be mounted to a PCB simultaneously with other components using automated surface mount assembly equipment, which increases quality while reducing assembly costs.

OVM9284 module samples are available now, and mass production is expected in Q4 of 2020.

OmniVision Technologies develops digital imaging based on its award-winning CMOS imaging technology for consumer and commercial applications, including mobile phones, security and surveillance, automotive, tablets, notebooks, webcams and entertainment devices, medical and AR, VR, drones and robotics imaging systems.

http://www.ovt.com

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Murata packages 6 DoF inertial sensor in automotive package

Fri, May 29, 2020

For safety-critical automotive applications, Murata offers the SCHA600, six degrees of freedom (DoF) xyz axis MEMS inertial sensor with patented self-test function for continuous monitoring.

The single package sensor offers cm-level accuracy for vehicle dynamics and position, for safe, robust and verified autonomous driving and in advanced driver assistance systems (ADAS).

The SCHA600 is qualified to AEC-Q100, includes advanced self-diagnostic features and complies to ASIL-D.

With an Allan variance down to 0.9 degrees/h at room temperature and gyro RMS noise level below 0.007 degrees/s, the sensor is claimed to deliver best in class performance for automotive applications in regard to bias stability and noise. The orthogonality of the measurement axis is calibrated at Murata to save systems integrators time and money.

The SCHA600’s failsafe functions and error bits for diagnostics include internal reference signal monitoring, checksum techniques for verifying communication and signal saturation/over range detection. Its component-level dynamic cross-axis calibration enables better than 0.3 degrees cross axis error over temperature.

The three-axis accelerometer contains a diagnostic feature of a continuously operating self-test function to monitor the sensor during measurement. This patented self-test function verifies the proper operation of the entire signal chain from MEMS sensor movement to signal conditioning circuitry for every measurement cycle.

The component is supplied in a SOIC housing body with dimensions of 18.7 mm x 8.5 mm x 4.5 mm and with 32 pins. Operating temperature range is −40 to +110 degrees C. Samples are available now.

Murata manufactures electronic components, modules and devices. The company’s range includes ceramic capacitors, resistors/thermistors, inductors/chokes, timing devices, buzzers, sensors and EMI suppression filters. As well as ceramic capacitors, the company manufactures Bluetooth and Wi-Fi modules, board-mount DC/DC converters and standard and custom AC/DC power supplies.

Established in 1944, Murata is headquartered in Japan and has European offices in Finland, France, Germany, Hungary, Italy, the Netherlands, Spain, Switzerland and the UK.

http://www.murata.com

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High power speaker amp ICs are optimised for autonomous driving

Thu, Apr 23, 2020

AEC-Q100-qualified 2.8W output Class AB monaural speaker amplifiers from Rohm Semiconductor are intended for instrumental clusters in vehicles equipped with autonomous driving and advanced driving assistance systems (ADAS).

The BD783xxEFJ-M series (BD78306EFJ-M, BD78310EFJ-M and BD78326EFJ-M)
have been developed for vehicle clusters where various sound outputs at high volume, including warning sounds, turn signals, welcome tones and voice guidance are required. They use a new type of over-current protection (OCP) circuit to protect against output shorts to deliver high 2.8W output, which was difficult to achieve in the past, reports Rohm. In addition to over-current protection, built-in thermal shutdown and under-voltage lock out (UVLO) ensure high reliability protection against abnormal conditions.

The amplifiers can withstand high temperature operation up to 105 degrees C to enable stable voice output without compromising functionality even under severe conditions, Rohm said.

With conventional over current protection circuits, the maximum output is limited, since the operating threshold of the protection circuit must be set to a value smaller than the maximum current the speaker amp can provide. Rohm’s over-current protection circuit eliminates the need to limit the output by preventing waveform distortion even at high output. The BD783xxEFJ-M series provides over-current protection from output shorts with 2.8W maximum output at 4Ohm load and 10 per cent distortion.

The BD783xxEFJ-M series is qualified to withstand automotive reliability standard AEC-Q100 and the power package reduces heat generation even at high volumes, resulting in stable audio output. In addition to over-current protection, thermal shutdown and under-voltage lock-out are built-in, preventing damage caused by abnormal heat generation and unexpected popping (cracking) noise during battery interruptions.

ROHM’s BD783xxEFJ-M series speaker operational amps are mounted on Cypress Semiconductor’s Traveo Cluster microcontroller family S6J3360 series evaluation board for automotive applications.

Rohm offers output gains of +6dB (BD78306EFJ-M), +10dB (BD78310EFJ-M), and +26dB (BD78626EFJ-M). The range will be expanded to include a total of 11 models ranging from +6dB to +26dB in 2dB steps.

http://www.rohm.com/eu

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dSpace integrates development and test for smart charging

Fri, Mar 27, 2020

The DS5366 Smart Charging Solution from dSpace offers automobile manufacturers and charging station providers developing and testing technologies for smart charging. International standards are adhered to and interoperability guaranteed, says the company. There is support for developers of onboard chargers, charging columns and, in the future, inductive charging systems.

The DS5366 Smart Charging Solution integrates existing test systems and a test depth that can be adjusted, depending on customer requirements. Extensive manipulations are possible, both at the electrical and at the protocol level. The software element of the solution contains an open model and there is a special hardware module for communication, according to ISO 15118, for an adaptation to the powerline communication.

All communication events are logged to allow for manual or automatic checks of the intended behaviour and compliance with the protocol specification. This can also be used to perform an error diagnosis to support conformance testing.

Typical applications are tests of the on-board chargers and charging stations, as well as the communication modules according to various charging standards. It can also be used in error simulation during communication. The dSpace DS5366 Smart Charging Solution enables the simulation of a variety of charging stations in the lab, emulates communication errors, and ensures that the engine control unit (ECU) functions without errors.

It will also be possible to test the compatibility between the developed charging stations and numerous simulated vehicles during tests on the charging station, dSpace adds.

For the development of on-board chargers, if no software or hardware is available for charging communication during the development of a vehicle charge controller, the DS5366 can replace the vehicle ECUs or their communication controllers for testing in-vehicle prototypes.

In combination with dSpace Automotive Simulation Models (ASM), which is the tool suite for simulating motors, vehicle dynamics, electric components, and the traffic environment, the DS5366 can be used for battery-powered electric vehicles, including real-time, high-voltage battery simulation. The models include emulation of a charging station in which the charging voltage depends on the vehicle power consumption, which is determined by the charging control unit that is tested in the vehicle. If no charge controller is available, ASM lets users simulate a controller using a constant current constant voltage (CCCV) charging process. Demo models are prepared in such a way that all signals required for communication with the control units are available to test control algorithms and the interfaces between all devices, according to CHAdeMO, ISO 15118, and GB/T 20234.2 standards.

http://www.dspace.de

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Wafer level automotive camera module boasts lowest power consumption

Murata packages 6 DoF inertial sensor in automotive package

High power speaker amp ICs are optimised for autonomous driving

dSpace integrates development and test for smart charging

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