Products Automotive Special Electric mobility Advanced automotive radar improves safety
A new battery management integrated circuit has been introduced by Texas Instruments Incorporated (TI). The IC increases the life of rechargeable lithium-ion battery packs and maximises available energy for hybrid and electric vehicles, power tools and uninterruptible power source (UPS) applications. The stackable bq76PL536 battery monitor, balancer and protector incor- porates analogue-to-digital converters for independent cell voltage and tem- perature protection, cell balancing and isolated chip-to-chip communication. The device intelligently measures bat- tery cell voltages to 1-mV accuracy, which is needed for demanding new lithium chemistries. The IC also provides full secondary
protection for over voltage, under volt- age and over temperature conditions. When safety thresholds are exceeded, the device sets the fault and alert out- puts independently of the normal com- munication channel.
No external components are needed to configure or enable the protection features available on the IC. Texas Instruments Inc.
www.ti.com Enter 210
Automotive safety is evolving from passive systems such as seat belts, airbags and crash detection to active sensing networks capa- ble of collision avoidance and accident prevention. Radar is an
especially promising active safety improvement and has the potential to significantly reduce the number and severity of dis- tracted driving accidents. Analog Devices, Inc., whose integrated inertial sensing iMEMS technology helped make airbags a standard automotive safety feature over 15 years ago, has introduced an affordable, high-performance, radar AFE (analogue front-end) IC. The company’s highly inte- grated AD8283 automotive radar AFE IC includes the receive path signal conditioning and data cap- ture circuitry to enable end sys-
tems for adaptive cruise control, blind spot detection and other radar-based detection and avoid- ance applications.
Automotive safety has entered the era of the intelligent vehicle, and affordable in-car radar sys- tems with excellent target classi- fication and range resolution are a key feature of that. As in-car radar moves from a luxury option to a standard safety feature, the AD8283 automotive radar AFE allows designers to program the settings they need for different operating conditions. Analog Devices, Inc.
www.analog.com Enter 211
Super Barrier Rectifiers improve reliability in auto
higher safe operating area (SOA) than alternative Schottky or ultra-fast diode alternatives. The rugged rectifiers enable automotive designers to in - crease the reliability of motor control, display panel and LED lighting circuits.
The first devices in a new family of Super Barrier Rectifiers (SBR), designed for automotive applications have been recently announced by Diodes Incorporated.
The new devices offer a lower forward voltage drop, improved avalanche rating and
New high perform 32-bit MCU
A new MCU with high-perform- ance graphics and network func- tionalities is now available from MSC. The SH7734 32-bit SuperH microcontroller (MCU), devel- oped by Renesas Electronics, fea- tures an Open VG compliant graphics accelerator and a Gigabit Ethernet controller. The MCU is based on a high- performance SH-4A CPU core operating at 533 MHz and is approximately 1.6 times faster
20
than the existing SH7764 MCU. The MCU incorporates a direct memory access (DMA) controller that supports DDR2 and DDR3 SDRAMs with a maximum clock frequency of 300 MHz. The DMA controller supports memory bandwidths up to 1.2 GBps. By including special graphics display functions that conform to the Open VG 1.1 specification, the MCU can be used with high operating speed and low memory requirement, visual effects such as animated displays, enlarge- ment, rotation, deformation and colour gradations in characters. Digital RGB output pins enable full-colour WVGA size (800 x 480 pixels) or high-colour XGA size (1024 x 768 pixels) displays. MSC Vertriebs
www.msc-ge.com Enter 213
The AECQ101 qualified SBR20A60CTB, SBR30A45CT BQ and SBR3045CTBQ recti- fiers handle output currents of 20A and 30A and are provided in an industry standard TO-263 package, while the SBR1045D- 1Q is rated for 10A and comes in the slightly smaller TO-252 package.
The family's low VF means circuit power efficiency can be improved and much cooler operation achieved.
The resulting improvement in reliability is further increased by the devices' higher reverse avalanche rating, that provides greater protection against transient voltage spikes and its lower reverse leakage provides a higher SOA and guards against thermal runaway in extreme conditions or high temperature operating environ- ments and applications. Diodes Incorporated
www.diodes.com Enter 212
New gyro for in-dash vehicle navigation
gation devices, offering a range of low- cost in-built systems.
A new 2000 inclined gyro, focused on the
growing in-dash vehicle navigation mar- ket, has been added to Silicon Sensing's PinPoint precision navigation and pointing MEMS gyroscope range. The new CRM120 gyro allows optimised
gyro sensitivity for inclined in-dash navi- gation.
The integration of in-car navigation into the car dashboard display is predicted to grow as vehicle manufacturers challenge the valuable aftermarket in personal navi-
The advantage of in-dash navigation is in the ability to draw information from a yaw rate gyro and wheel speed sensor to provide accurate and responsive dead- reckoning navigation to the driver without the usual dependence on GPS. PinPoint gyros combine lower cost, weight and size, with good bias and scale factor performance compared to older navigation gyros.
At under 6x5x1.2mm, weighing less than 0.1g, the gyros provide good rate out- put stability over time, temperature, vibra- tion and shock for a MEMS gyro in their class. This performance is the result of a vibrating ring sensor design - a balanced ring of silicon that resonates at 22kHz in a closed-loop control system. Silicon Sensing
www.siliconsensing.com JULY 2011 Electronics
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