editor's blog
Subscribe Now

Smallest Accelerometer

At the same time that Bosch Sensortec announced its orientation sensor, they also announced their BMA355 accelerometer, which is distinguished by its size. Prior to this, the smallest footprint available for an accelerometer was 2×2 mm2. This guy is 1.2×1.5 mm2.

This was done via a die shrink. The MEMS is placed over the ASIC; the ASIC is more or less bonded straight down to its leads; it’s essentially chip-scale packaging.

In fact, they could have made the ASIC even smaller, but they were limited by a couple things:

–          The pad pitch is limited to 0.4 mm, which is standard at this point (smaller pitches are possible, but they’re considered specialized). So they’re now officially pad-limited.

–          They need to be able to put the MEMS chip on top of the ASIC and bond it down; that also sets a size constraint.

Size notwithstanding, they still include the standard interrupts, including motion on/off, double-tap, tilt, and shock. You can find more info in their release.

Leave a Reply

featured blogs
Jul 3, 2020
[From the last episode: We looked at CNNs for vision as well as other neural networks for other applications.] We'€™re going to take a quick detour into math today. For those of you that have done advanced math, this may be a review, or it might even seem to be talking down...
Jul 2, 2020
Using the bitwise operators in general -- and employing them to perform masking, bit testing, and bit setting/clearing operations in particular -- can be extremely efficacious....
Jul 2, 2020
In June, we continued to upgrade several key pieces of content across the website, including more interactive product explorers on several pages and a homepage refresh. We also made a significant update to our product pages which allows logged-in users to see customer-specifi...

Featured Video

Product Update: DesignWare® Foundation IP

Sponsored by Synopsys

Join Prasad Saggurti for an update on Synopsys’ DesignWare Foundation IP, including the world’s fastest TCAMs, widest-voltage GPIOs, I2C & I3C IOs, and LVDS IOs. Synopsys Foundation IP is silicon-proven in 7nm in more than 500,000 customer wafers, and 5nm is in development.

Click here for more information about DesignWare Foundation IP: Embedded Memories, Logic Libraries & GPIO

Featured Paper

Cryptography: A Closer Look at the Algorithms

Sponsored by Maxim Integrated

Get more details about how cryptographic algorithms are implemented and how an asymmetric key algorithm can be used to exchange a shared private key.

Click here to download the whitepaper

Featured Chalk Talk

PiezoListen: A New Kind of Speaker for New Applications

Sponsored by Mouser Electronics and TDK

Until recently, putting speakers into extremely space-constrained designs was a daunting challenge. Now, however, advances in piezo speakers bring remarkable performance to ultra-small ultra-thin speakers. In this episode of Chalk Talk, Amelia Dalton chats with Matt Reynolds of TDK about PiezoListen - a whole new kind of high-performance multilayer piezo speaker.

Click here for more information about TDK PiezoListen™ Ultra-Thin Piezo Speakers