TDK Presents Second-Generation 6-axis IMUs for Advanced Driver Assistance and Safety Applications

• SmartAutomotive™ IAM-20685HP and IAM-20689 are second generation 6-axis MEMS IMUs suited for safety-relevant automotive applications up to ASIL D

• Compact in size and operating in a wide temperature range, they also seamlessly integrate into automotive modules for advanced driver assistance applications (ADAS)

• Both IMUs can combine multiple applications within a single central unit, leveraging motion detection across all six directions

TDK Corporation (TSE:6762) further extends its InvenSense SmartAutomotive™ MEMS sensor family with the IAM-20685HP and IAM-20689 second generation 6-axis IMUs for automotive safety applications. Both devices deliver reliable motion data for decision-making algorithms and accurately detect vehicle dynamics in real-time to enhance advanced driver assistance (ADAS) and safety applications, which require higher levels of functional safety up to ASIL D. Mass production of IAM-20685HP and IAM-20689 has started, and samples are already available.

IAM-20685HP is capable of achieving ASIL B on all technical safety requirements. It was specifically developed to enhance ADAS applications, e.g. to increase the driver's experience while driving or parking. With its compact size and operating temperature of up to 125℃, IAM-20685HP is well suited for ADAS positioning and vision systems. Furthermore, it can be used in compact modules where high computational power combined with a small size requires high and stable IMU performance over a wide temperature range.

Compared to the IAM-20685HP, the IAM-20689 is a safety-focused 6-axis IMU featuring extended embedded diagnostics. It has been designed to meet systems with requirements up to ASIL D and to elevate safety in critical automotive applications, like electronic/roll stability control (ESC/RSC) and drive-by-wire (DbW).

While both components differ in ASIL, they share the same core design, package size, and register map, and both incorporate a diverse set of safety mechanisms that ensure real-time monitoring of sensor parameters. Embedded diagnostics eliminate the need for an external software library to reach the according functional safety level. This allows customers to easily integrate IAM-20685HP and IAM-20689 into their applications.

"Thanks to the IAM-20689, TDK can offer more flexibility to automotive safety customers by eliminating the need for multiple 3-axis sensors in the vehicle. This simplifies system complexity, enhances ease of use, and provides opportunities for miniaturization", says Alberto Marinoni, Sr, Director Product Marketing Automotive at InvenSense, a TDK Group company. "Most safety applications today rely on a limited number of axes, rendering current solutions partially blind and unable to gather all vehicle dynamics. Transitioning to a 6-axis solution ensures no motion information is missed, unlocking broader application possibilities for developers."

IAM-20685HP and IAM-20689 take advantage of TDK's proprietary MEMS fabrication technology that offers improved reliability compared to other MEMS fabrication technologies available. They have both been developed as a Safety Element out of Context (SEooC) and are automotive qualified according to AEC-Q100 grade 1. Both sensors are available in a small 4.5 × 4.5 × 1.1 mm³ QFN package with wettable flanks options that allow visual inspection at the end of the assembly line.

Glossary

• ISO 26262: Road vehicles – functional safety standard

• SEooC: Safety Element out of Context

• ASIL: Automotive Safety Integrity Level

• ADAS: Advanced driver assistance systems

• 6-axis: 3-axis gyroscope + 3-axis accelerometer

• IMU: Inertial measurement unit

• CRC: Cyclic redundancy check

• MEMS: Micro-electro-mechanical systems

Main applications*

IAM-20685HP and IAM-20689 address a wide range of automotive applications, including but not limited to:

• ADAS systems
  

• Automated parking

• Vision systems

• Vehicle dynamics systems

• Electronic stability control (ESC)

• Roll stability control (RSC)

• Drive-by-wire (DbW)

• Adaptive front-lighting systems

• Active suspension systems

Main features and benefits**

• Integrated 6-axis IMU (3-axis accelerometer and 3-axis gyroscope)
  

• Operating range of -40℃ to 125℃

• User selectable full-scale for both gyroscope and accelerometer

• Two embedded temperature sensors

• 16-bit output for accelerometer, gyroscope, and temperature sensors

• 10 MHz SPI serial interface with CRC

• 24-pin QFN package 4.5 × 4.5 × 1.1 mm³ with wettable flanks

*  Any mention of target applications for our products are made without a claim for fit for purpose as this has to be checked at system level.

**  All operating parameters must be validated for each customer application by customers’ technical experts.