Automotive

Dual output Hall-effect sensors save space while detecting speed and direction

Thu, Sep 21, 2023

For high voltage, automotive and industrial applications, the AH39xxQ series of Hall-effect sensors provide speed and directional data, said Diodes.

The high-voltage, dual output, automotive-compliant sensors provide accurate speed and directional data or two independent outputs. They are designed for industrial and automotive applications such as detecting rotational and linear speed/direction and determining the angular position of a rotating shaft.

They operate over a wide supply voltage range of 2.7 to 27V to meet automotive battery requirements.  They also have a 40V absolute maximum rating, enabling them to safely handle 40V load dumps. 

There is also -18V of reverse voltage protection to guard against incorrect battery connections. 

For added robustness, the ESD (electrostatic discharge) protection exceeds the automotive norms of 5kV human body model (HBM) and 2kV charge device model (CDM).

Three BOP/BRP (operating/release) options are offered, with typical values of 10/-10, 25/-25 and 75/-75 Gauss and the narrow operating window ensures accurate and reliable switching points, confirmed Diodes. 

Dual-channel operation means these sensors can replace two latch switches, reducing both PCB space and overall component costs. Combining chopper-stabilised amplifiers with an advanced Hall plate design mitigates switch point drift, ensuring accurate measurements over a broad temperature range. 

The self-diagnostic features make the AH39xxQ sensors suitable for ISO 26262-compliant systems. There is also a safe operating mode which is entered if an error, such as over-temperature or under-voltage lockout, is detected.

The AH39xxQ series Hall-effect sensors from Diodes are AEC-Q100 Grade 0 qualified, manufactured in IATF 16949 certified facilities, and support PPAP (production part approval process) documentation. 

They are supplied in TSOT25 packages. 

Diodes supplies semiconductor products to the world’s leading companies in the automotive, industrial, computing, consumer electronics, and communications markets. Its product portfolio consists of discrete, analogue and mixed-signal products and packaging technology.

The company has worldwide operations of 32 sites, including engineering, testing, manufacturing.

http://www.diodes.com

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MAC-PHY devices connect automotive devices with 10BASE-T1S Ethernet

Fri, Sep 15, 2023

A family of LAN8650/1 MAC-PHY devices developed by Microchip Technology can be used to connect low-cost microcontrollers without a built-in Ethernet MAC (media access controller) to a 10BASE-T1S Ethernet network.
In automotive designs, 10BASE-T1S technology makes it possible for low speed devices to connect to a standard Ethernet network, eliminating the need for dedicated communication systems. Expanding its portfolio of automotive-qualified Ethernet solutions, the LAN8650 and LAN8651 MAC-PHYs are qualified for automotive applications. They include a MAC and SPI (serial peripheral interface) to connect devices at the edge of automotive networks.
The built-in MAC and SPI enable designers to connect 8-, 16-, and 32-bit microcontrollers that do not have a built-in Ethernet MAC to 10BASE-T1S SPE (single pair Ethernet) networks. As a result, sensors and actuators that interface between the digital and the real world to become part of an all-Ethernet architecture. Connecting to even the simplest microcontrollers can reduce the overall size and cost of a design, said Microchip.
Matthias Kaestner, corporate vice president of Microchip’s automotive business, commented: “This new technology will connect sensors and actuators in the physical world all the way to the cloud, enabling a seamless Ethernet architecture in vehicles, which in turn reduces development effort and time to market”.

These devices are equipped with time-sensitive networking (TSN) support, which allows for synchronised timing across Ethernet networks. This synchronisation is critical for many automotive applications such as advanced driving assistance systems (ADAS).
The automotive-qualified LAN8650/1 devices comply with AEC-Q100 Grade 1 for enhanced robustness in harsh environments, including extended operational temperature range from -40 to +125 degrees C.  They are also functional safety ready and designed for use in ISO 26262 applications.
The LAN8650/1 MAC-PHYs are supported with a set of network analysis tools, the LAN8651 SPI evaluation board and MPLAB Harmony 3. The MAC-PHYs are available to purchase now.

http://www.microchip.com

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Radar test system simulates driving scenarios for ADS and autonomous cars

Fri, Sep 15, 2023

At next week’s European Microwave Week (EuMW 2023), Rohde & Schwarz will introduce a radar test system which simulates driving scenarios for testing radar-based advanced driver assistance systems (ADAS) and radar sensors used in automated driving cars over the air.

New options for the company’s R&S AREG800A automotive radar echo generator and the R&S QAT100 antenna array generate “extremely short distances” for the artificial objects, and therefore enables realistic autonomous braking tests with the smallest distance possible, claimed Rohde & Schwarz. 

The radar test system can be used for radar object simulation, from single sensor tests to 360 degree environments, covering 76 to 81GHz for automotive radar sensors. Its scalability and adaptability allow a range of ADAS traffic scenarios to be electronically generated along the whole testing lifecycle.

It also enables tests currently performed in real-world test drives to be relocated to the lab, enabling errors to be detected at an early stage and delivering significant cost savings.

The R&S AREG800A automotive radar echo generator operates as a backend and the R&S QAT100 antenna array acts as a frontend in the systems which can be used in benchtop development, hardware-in-the-loop and vehicle-in-the-loop. For production, the R&S AREG800A automotive radar echo generator operates as a backend and the R&S AREG8-24/81S/D antenna is a frontend. 

The AREG800A is claimed to provide a higher instantaneous bandwidth to improve the distance resolution. With the mmW remote frontends R&S AREG8-81S/D, the instantaneous bandwidth will be extended from 4.0 to 5GHz, offering a future proof solution so that the users can measure their automotive radars using a higher bandwidth.

A new feature for near object range allows minimum distance of one or more artificial objects to be reduced down to the airgap value of the radar under test.

For the R&S QAT100 a new option is R&S QAT-B1 Enhanced Flatness. It contains a detailed characterisation of each antenna of the QAT frontends. With this option, the accuracy of the amplitude flatness of all antennas is improved when operated with R&S AREG800A.

http://www.rohde-schwarz.com

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Second generation DC/DC converter targets e-mobility

Thu, Sep 07, 2023

The second generation of 4kW liquid cooled DC/DC converters from Bel Power Solutions, the 700DNG40-24-8, creates DC voltages in hybrid and electric vehicles suitable to power low voltage accessories and replacing a traditional alternator.

The converter is smaller than its predecessor, the 700DNC40-24-8G, and operates at a wider input voltage range from 450 to 900V DC to deliver up to 4000W of output power. The compact design weighs just 4.5kg, making it suitable for confined spaces in a variety of deployments in construction, mining, bus and trucking, along with marine and ground support equipment.

The 700DNG40-24-8 has high efficiency of up to 95 per cent and is reliable with low output voltage noise and excellent dynamic response to load/input changes, said Bel Fuse. The 700DNG40-24-8 converter can be operated in parallel with up to eight units, and includes optional UDS functionality, CAN FD and cybersecurity. 

The 700DNG40-24-8 DC/DC converter is available immediately. It will be exhibited at the Battery Show North America in Novi, Michigan (12 to 14 September) on the company’s booth #936.

It is available through distributors, Digikey and Mouser.

Bel designs, manufactures and markets a broad array of products that includes circuit protection, connectors, cable assemblies, discrete components, magnetics and power supplies. The company operates facilities around the world.

http://www.belfuse.com

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