iPhone 6 and 6 Plus Equipped With Two Accelerometers for Power Management, Improved User Experience

Apple has opted to equip the iPhone 6 and 6 Plus with two separate accelerometers, as discovered in Chipworks' comprehensive iPhone 6 and 6 Plus teardown. There's a three-axis Bosch BMA280 accelerometer and what Chipworks believes is a MPU-6700 six-axis accelerometer from InvenSense.

According to Chipworks, Apple may have decided to incorporate two accelerometers into the iPhone 6 and 6 Plus to both minimize power consumption and "improve the overall user experience."

The InvenSense accelerometer has a range of functions, allowing it to operate in several different modes, but it can draw more power than the Bosch accelerometer due to its higher sensitivity. The maximum sensitivity of the InvenSense is at 16684 LSB/g, much higher than the Bosch's 4096.

accelerometers

The InvenSense device can operate as a six axis inertial sensor, or as either a three-axis gyroscope or a three-axis accelerometer. It is rated to consume 3.4 mA in the six-axis mode, 3.2 mA in the gyroscope mode and 450 µA in the accelerometer normal mode. By contrast, the Bosch device operates as a 3-axis accelerometer only and it consumes 130 µA of current in the accelerometer normal mode. Both devices offer two low power levels of operation for the accelerometer function. The InvenSense device actually consumes less current in its lowest power mode, with a 1 Hz update rate.

The main benefit of the InvenSense is full six-axis integration of the data by the on-chip digital motion processor (DMP). This will provide a direct benefit for gaming and other applications that need sophisticated inertial sensing capabilities. In addition the InvenSense provides significantly higher sensitivity than the Bosch device. The price however, is higher power consumption.

The Bosch accelerometer is able to operate at a lower power than the InvenSense and it has a "much faster" cold start up time, at 3ms compared to 30ms, allowing it to be used when complete six-axis integration is unnecessary. Chipworks speculates that it may be used for tasks where higher sensitivity is unneeded, perhaps for rotating the screen from landscape to portrait mode or for pedometer functionality.

specificationcomparison
According to Chipworks, the inclusion of two accelerometers in the iPhone 6 and 6 Plus is an example of Apple's "elegant engineering." A single InvenSense accelerometer would have enabled the device to work perfectly well, but the addition of the Bosch accelerometer allows for lower power consumption in the appropriate situations.

Top Rated Comments

(View all)
Avatar
77 months ago
All Android devices from here on will have at least 3 accelerometers as a result.
Score: 74 Votes (Like | Disagree)
Avatar
77 months ago
I am glad that we are finally getting back on track with actual iPhone specs and NOT the bendability results.
Score: 31 Votes (Like | Disagree)
Avatar
77 months ago
OK, so I got the obvious, witty Android joke out of the way. Here's the real point:

A lot of people look at these devices being released every year with the sense that all these companies do (LG, Samsung, and others included) is slap the same old components on the inside and change the case or screen size. In reality, they are re-architecting a lot of the technology every year or two. This is not easy to do.

Only when we get tear downs and such do we get the full story of everything going on inside the shell. These guys are doing amazing work to move technology forward. The result is better devices and increased convenience/utility for the user.

The engineers that put this particular solution together aren't going to be recognized or win any awards, but they're doing great things.
Score: 28 Votes (Like | Disagree)
Avatar
77 months ago

I would have rather had 2 gigz of ramz.


It is exactly this type of clever engineering which is why Apple don't need to include 2Gb of ram just to look good in the specs race.
Score: 25 Votes (Like | Disagree)
Avatar
77 months ago
I would have rather had 2 gigz of ramz.
Score: 17 Votes (Like | Disagree)
Avatar
77 months ago

And if apple would of made it thicker we could of had the 3 accelerometers it clearly should have!

HAVE.. FOR THE LOVE OF GOD... HAVE... :cool:
Score: 15 Votes (Like | Disagree)

Top Stories

Supposed iPhone 12 Display Unit Leaks

Thursday August 6, 2020 8:13 am PDT by
An image supposedly of an iPhone 12 display unit has been shared online by leaker "Twitter user Mr. White". Compared to images of an iPhone 11 Pro display piece, this new unit has a reoriented display connector, reaching up from the bottom of the display, rather than from the left-hand side on iPhone 11 Pro. This may be due to the logic board moving to the other side of the device. A...

8 Third-Party Home Screen Widgets That You Can Try Out Now on iOS 14

Wednesday August 5, 2020 12:56 pm PDT by
One of the biggest new features of iOS 14 is Home Screen widgets, which provide information from apps at a glance. The widgets can be pinned to the Home Screen in various spots and sizes, allowing for many different layouts. When the iOS 14 beta was first released in June, widgets were limited to Apple's own apps like Calendar and Weather, but several third-party developers have begun to test ...

Apple Seeds iOS 14 and iPadOS 14 Public Beta 4 to Testers

Thursday August 6, 2020 10:05 am PDT by
Apple today seeded new public betas of upcoming iOS 14 and iPadOS 14 updates to its public beta testing group. Today's software releases, which Apple labels as fourth betas to keep them in line with developer betas, are actually the third betas that Apple has provided and they come two weeks after the prior beta releases. Public beta testers who have signed up for Apple's beta testing...

Apple Takes Legal Action Against Small Company With Pear Logo

Saturday August 8, 2020 11:09 am PDT by
Apple is taking legal action against the developers of the app "Prepear" due to its logo, according to iPhone in Canada. Prepear is an app that helps users discover recipes, plan meals, make lists, and arrange grocery deliveries. The app is a spinoff of "Super Healthy Kids," and the founders claim that they are facing litigation from Apple. Apple reportedly takes issue with Prepear's logo, ...

Google's $349 Pixel 4a vs. Apple's $399 iPhone SE

Wednesday August 5, 2020 1:45 pm PDT by
Google this week launched its newest smartphone, the $349 Pixel 4a, a low-cost device that's designed to compete with other affordable devices like Apple's iPhone SE. We picked up one of the new Pixel 4a smartphones and thought we'd check it out to see how it measures up to the iPhone SE, given that the two devices have such similar price points. Subscribe to the MacRumors YouTube channel ...

2020 iMac Benchmarks Surface Online [Updated]

Thursday August 6, 2020 7:16 am PDT by
Benchmarks from the new 2020 iMac have today been shared online by Mac Otakara. The Geekbench benchmarks are from the newly-released 27-inch iMac with 3.0GHz Intel Core i5 processor and Radeon Pro 5300 graphics, compared to multiple specs of the previous 2019 iMac. The lowest spec 27-inch i5 iMac from 2020 performs about 20 percent better in multicore than the lowest spec 27-inch i5...

New 27-Inch iMac's Storage Affixed to Logic Board, 4TB and 8TB Configurations Have Expansion Connector

Friday August 7, 2020 7:46 am PDT by
Following a report from German blog iFun.de that claimed the new 27-inch iMac's flash storage is soldered to the logic board, MacRumors has obtained additional information in an internal document for Apple technicians. In the document, Apple says that the flash storage is indeed affixed to the logic board and cannot be removed. However, for the 4TB and 8TB configurations, Apple says that a...

Microsoft's xCloud and Xbox Game Pass Not Coming to iOS Due to Apple's Restrictions [Updated]

Thursday August 6, 2020 1:06 pm PDT by
Microsoft's "Project xCloud" streaming game service that pairs with its Xbox Game Pass won't be available on iPhone and iPad when it launches this September, and Apple's App Store restrictions are to blame. Xbox Game Pass and its accompanying xCloud streaming feature offer access to hundreds of games that can be streamed to mobile devices, and Apple says that because it can't review each...

Apple Announces New 27-Inch iMac With 10th-Gen Processors, Up to 128GB RAM, 1080p Webcam, True Tone, and More

Tuesday August 4, 2020 8:07 am PDT by
Apple today announced a new 27-inch iMac with faster 10th-generation Intel Core processor options, next-generation AMD graphics, up to 128GB of RAM, a higher-resolution 1080p front-facing FaceTime camera, a True Tone display with a nano-texture glass option, a T2 chip, higher fidelity speakers, studio-quality microphones, and more. A breakdown of the new 27-inch iMac's features and specs:10th...

Samsung Launches Galaxy Note 20, Galaxy Z Fold 2, and Galaxy Buds to Compete With Apple's iPhones and AirPods Pro

Wednesday August 5, 2020 10:07 am PDT by
Samsung today held a virtual Galaxy Unpacked event where it unveiled its next-generation smartphones that will compete with Apple's 2020 iPhone lineup, set to come out in the fall. Samsung announced the launch of the Galaxy Note 20 and the Galaxy Note 20 Ultra, the two newest devices in the Note lineup, and, more notably, the Galaxy Z Fold 2, Samsung's latest foldable smartphone. The...