Apple S1

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Apple S1
Apple S1 module.png
The S1 integrated computer, 2.5 cm wide[1]
Produced From November 13, 2014 to September 7, 2016
Designed by Apple Inc.
Common manufacturer(s)
Max. CPU clock rate 520 MHz[3] 
Min. feature size 28 nm[3][2]
Instruction set ARM[3]
Microarchitecture ARMv7-A compatible[3]
Product code APL0778[4]
Cores 1[3]
L1 cache 32 KB data[3]
L2 cache 256 KB[3]
Successor Apple S2
GPU PowerVR SGX543[5]
Application Apple Watch
Variant Apple S1P
Apple S1P
Apple S1P module.png
Produced From September, 2016 to September, 2018
Designed by Apple Inc.
Max. CPU clock rate 520 MHz[6] 
Instruction set ARM[6]
Microarchitecture ARMv7-A compatible[6]
Cores 2[6]
Predecessor Apple S1
GPU PowerVR Series 6 'Rouge'[6]
Application Apple Watch Series 1

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]

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.[4]

System-in-Package design[edit]

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]


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]


The SiP in Apple Watch Series 1 is called S1P and looks superficially identical to the S1, but it includes most of the new features of the Apple S2 except notably for 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]


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[edit]

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]


See also[edit]


  1. ^ "s1_decapped_abi.jpg". 2015-04-30. Retrieved 2016-05-01.
  2. ^ a b c Inside the Apple Watch: Technical Teardown
  3. ^ a b c d e f g Ho, Joshua; Chester, Brandon (July 20, 2015). "The Apple Watch Review: Apple S1 Analysis". AnandTech. Retrieved July 27, 2015.
  4. ^ a b "Apple Watch Insides / PCB Details Revealed for the First Time". ABI Research. Retrieved 30 April 2015.
  5. ^ a b "Apple Watch runs 'most' of iOS 8.2, may use A5-equivalent processor". AppleInsider. Retrieved 25 April 2015.
  6. ^ a b c d e
  7. ^ a b "Apple Unveils Apple Watch". Apple Inc. Retrieved 8 October 2014.
  8. ^ Samsung Supposedly Wins Orders to Produce Apple Watch Components
  9. ^ a b " - Apple Watch - Technology". Apple. Retrieved 8 October 2014.
  10. ^ "Broadcom Wins WiFi in Apple Watch?". Chipworks. Retrieved 8 October 2014.
  11. ^ Hopper happily opens Apple Watch binaries ('armv7k') to disassemble, says they're 'armv7m'. -- Steve Troughton-Smith
  12. ^ We Just Took Apart the Apple Watch Series 1—Here’s What We Found Out
  13. ^ a b Apple Introduces Apple Watch Series 2, The Ultimate Device For A Healthy Life
  14. ^ Tim Cook: Apple Watch on Schedule to Ship in April
  15. ^ a b c d "Introducing the Apple Watch - Movie". Apple. Retrieved 8 October 2014.