Apple S1

The Apple S1 is the integrated computer in the Apple Watch, and it is described as a "System in Package" (SiP) by Apple Inc.[7]

Apple S1
The S1 integrated computer, 2.5 cm wide[1]
General information
Launched13 November 2014
Discontinued7 September 2016
Designed byApple Inc.
Common manufacturer(s)
Product codeAPL0778[3]
Performance
Max. CPU clock rate520 MHz[4] 
Cache
L1 cache32 KB data[4]
L2 cache256 KB[4]
Architecture and classification
ApplicationApple Watch
Technology node28 nm[4][2]
Instruction setARMv7-A[4]
Physical specifications
Cores
GPU(s)PowerVR SGX543[5]
Products, models, variants
Variant(s)
History
Successor(s)Apple S2
Apple S1P
General information
LaunchedSeptember, 2016
DiscontinuedSeptember, 2018
Designed byApple Inc.
Performance
Max. CPU clock rate520 MHz[6] 
Architecture and classification
ApplicationApple Watch Series 1
MicroarchitectureARMv7-A compatible[6]
Instruction setARM[6]
Physical specifications
Cores
GPU(s)PowerVR Series 6 'Rogue'[6]
History
Predecessor(s)Apple S1

Samsung is said to be the main supplier of key components, such as the RAM and NAND flash storage, and the assembly itself,[8] but early teardowns reveal RAM and flash memory from Toshiba and Micron Technology.[3]

System-in-Package design

It uses a customized application processor that together with memory, storage and support processors for wireless connectivity, sensors and I/O constitute a complete computer in a single package. This package is filled with resin for durability.[9]

Components

From reverse engineering, the processor handling the Wi-Fi and Bluetooth is a Broadcom BCM43342[10] and the six-axis gyroscope is from STMicroelectronics.[2]

S1P

The SiP in Apple Watch Series 1 is called S1P and looks superficially identical to the S1, but in reality is an S2 minus the on-chip GPS functionality. It contains the same dual-core CPU with the same new GPU capabilities as the S2 making it about 50% faster than the S1.[12][13]

Announcement

The S1 was announced on 9 September 2014 as part of the "Wish we could say more" event.

The S1P was announced on 7 September 2016 as part of the "See you on the 7th" event.

Launch date

The S1 made its first appearance within the Apple Watch, which arrived in April 2015.[7][14] The S1 was discontinued with the launch of Apple Watch Series 1, containing the S1P.

The S1P was released with the Apple Watch Series 1 on 16 September 2016.[13]

Images
  • An illustration of the encapsulated S1 package.
    An illustration of the encapsulated S1 package.[9][15]
  • The S1P package shows little of the differences that's encapsulated inside.
    The S1P package shows little of the differences that's encapsulated inside.
  • This illustration shows the positions of the chips and other components inside the S1 package.
    This illustration shows the positions of the chips and other components inside the S1 package.[15]
  • This is how large the S1 is compared to the Apple Watch case.
    This is how large the S1 is compared to the Apple Watch case.[15]
  • A size comparison of the S1 to the Apple A6 in the iPhone 5.
    A size comparison of the S1 to the Apple A6 in the iPhone 5.[15]

See also

References
  1. "s1_decapped_abi.jpg". 30 April 2015. Archived from the original on 5 May 2016. Retrieved 1 May 2016.
  2. "Inside the Apple Watch: Technical Teardown". Archived from the original on 18 May 2015. Retrieved 30 April 2015.
  3. "Apple Watch Insides / PCB Details Revealed for the First Time". ABI Research. Archived from the original on 6 June 2017. Retrieved 30 April 2015.
  4. Ho, Joshua; Chester, Brandon (20 July 2015). "The Apple Watch Review: Apple S1 Analysis". AnandTech. Archived from the original on 22 July 2015. Retrieved 27 July 2015.
  5. "Apple Watch runs 'most' of iOS 8.2, may use A5-equivalent processor". AppleInsider. Archived from the original on 26 April 2015. Retrieved 25 April 2015.
  6. "The Apple Watch Series 2 Review: Building Towards Maturity". Archived from the original on 22 October 2017. Retrieved 11 February 2018.
  7. "Apple Unveils Apple Watch". Apple Inc. Archived from the original on 19 April 2017. Retrieved 8 October 2014.
  8. "Samsung Supposedly Wins Orders to Produce Apple Watch Components". Archived from the original on 30 April 2015. Retrieved 9 January 2015.
  9. "Apple.com - Apple Watch - Technology". Apple. Archived from the original on 9 September 2014. Retrieved 8 October 2014.
  10. "Broadcom Wins WiFi in Apple Watch?". Chipworks. Archived from the original on 6 October 2014. Retrieved 8 October 2014.
  11. "Hopper happily opens Apple Watch binaries ('armv7k') to disassemble, says they're 'armv7m'. -- Steve Troughton-Smith". Archived from the original on 3 March 2016. Retrieved 25 June 2015.
  12. "We Just Took Apart the Apple Watch Series 1—Here's What We Found Out". Archived from the original on 24 January 2018. Retrieved 13 October 2016.
  13. "Apple Introduces Apple Watch Series 2, The Ultimate Device For A Healthy Life". Archived from the original on 14 April 2017. Retrieved 8 September 2017.
  14. "Tim Cook: Apple Watch on Schedule to Ship in April". Archived from the original on 4 April 2015. Retrieved 30 January 2015.
  15. "Introducing the Apple Watch - Movie". Apple. Archived from the original on 7 October 2014. Retrieved 8 October 2014.
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