TDK Corp. has introduced the InvenSense SmartAutomotive IAM-20680HV (high value) six-axis inertial measurement unit (IMU) for automotive in-cabin applications that also require the component to operate in harsh conditions. Offering low-noise performance, sensitivity tolerance, and high reliability, this MEMS sensor can be used in a range of in-cabin applications such as telematics, heads-up displays, navigation systems, door control, and crash detection.
The IAM-20680HV integrates a three-axis gyroscope and a three-axis accelerometer in a 3 × 3 × 0.75 mm³ (16-pin LGA) package. The package provides pin-to-pin and register compatibility with all other SmartAutomotive MEMS sensors in LGA packages.
(Source: TDK Corp.)
The SmartAutomotive IAM-20680HV offers the best trade-off to address cost-effective automotive applications without compromising quality or performance. Rounding out its portfolio of IMUs, accelerometers, and gyroscopes for non-safety automotive applications, the “HV” or high-value IMUs join TDK’s high performance (HP) and standard performance (HT) devices. The HV devices offer reduced performance at a price to address cost-sensitive applications.
TDK’s customers, especially in Asia, need components that address cost-sensitive applications in the automotive space, said Alberto Marinoni, senior director of product marketing automotive at InvenSense, a TDK Group company. This means reducing the specifications compared to other components in the portfolio, without redesigning the component, he added.
The good news is that all parts have the same package and the same pin out, so the customer can design just one system, Marinoni said. For example, they can design one navigation system, populating high-end models with the high-performance component, standard models with the HT component, and HV for price-sensitive applications or price-sensitive OEMs that are pushing more and more for cost reduction from an application point of view, he continued.
Marinoni stressed that since the HV devices have the same design and use the same silicon, even with “relaxed” specifications, they offer the same quality and reliability level.
Since the chip is not redesigned, and even if some specifications are relaxed, the HV parts still offer leading noise performance and sensitivity tolerance, thanks to the design and TDK technology, he said.
He also noted TDK’s range of in-cabin portfolio offers lots of flexibility for the customer with devices that withstand temperatures from 85°C to 105°C, in a portfolio ranging from six-axis IMUs to three-axis accelerometers and three-axis gyroscopes, all with the same package and pinout.
The IAM-20680HV, with an operating temperature range of -40°C to 105°C, can also withstand an operating temperature up to 125°C without damage.
TDK performed an extended reliability test to guarantee that the component will not be damaged up to 125°C to meet customer requirements. “Many customers are asking ‘my applications sometimes exceed 105°C, will the component be reliable again when I go back to 105°C or can the component be damaged by the high temperature,’” Marinoni explained.
“So, we decided to offer the operating temperature range extended to guarantee that even if the temperature exceeded 105°C, there will be no damage to the component,” he added. “The specifications [per the data sheet] are guaranteed from -40°C to 105°C. We can also guarantee the operability of the component up to 125°C; the component will still work but we do not guarantee the specification.”
The IAM-20680HV provides a 16-bit digital output for both the gyroscope and accelerometer, and user programmable digital filters for the gyroscope, accelerometer, and temperature sensors. It features a selectable ±125 dps gyroscope full-scale, delivering higher resolution for enhanced navigation. The user programmable full-scale range includes ±125 dps, ±250 dps, ±500 dps, and ±1000 dps. The accelerometer offers a programmable full-scale range of ±2 g, ±4 g, ±8 g, and ±16 g.
The specs are relaxed compared to the HT devices in terms of offset and sensitivity, but the full-scale range of the gyroscope is improved, Marinoni said. “Because the gyroscope full scale starts from 125 dps, compared to all the other gyroscopes in the portfolio that start at 250 dps, we can increase the resolution for better performance during navigation.”
Other features of the AEC Q100 Grade 2-qualifed IMU included embedded self-test and two embedded and configurable interrupt lines. The IMU also offers I2C and SPI digital interfaces. Current consumption is 3-mA typical.
The IAM-20680HV is available through TDK’s global distributors. Also available are the EV_IAM-20680HV evaluation board for three-axis and six-axis motion sensing products in the IAM-2038x/680x family and the DK-UNIVERSAK-I microcontroller board for motion sensor evaluation, which is compatible with three-axis gyroscopes, three-axis accelerometers, and six-axis IMUs.
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