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Apple S1P
General information
Launched	September, 2016
Discontinued	September, 2018
Designed by	Apple Inc.
Performance
Max. CPU clock rate	520 MHz
Architecture and classification
Application	Apple Watch Series 1
Microarchitecture	ARMv7-A compatible
Instruction set	ARM
Physical specifications
Cores	2;
GPU	PowerVR Series 6 'Rogue'
History
Predecessor	Apple S1

Apple S1
	The S1 integrated computer, 2.5 cm wide
General information
Launched	13 November 2014
Discontinued	7 September 2016
Designed by	Apple Inc.
Common manufacturer	Samsung;
Product code	APL0778
Performance
Max. CPU clock rate	520 MHz
Cache
L1 cache	32 KB data
L2 cache	256 KB
Architecture and classification
Application	Apple Watch
Technology node	28 nm
Instruction set	ARMv7-A
Physical specifications
Cores	1;
GPU	PowerVR SGX543
Products, models, variants
Variant	Apple S1P;
History
Successor	Apple S2

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.^[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]

Apple designed 32-bit ARMv7^[11] based application processor APL0778 as the central processing unit (CPU), with an integrated PowerVR SGX543 graphics processing unit (GPU).^[5]
512 MB DRAM from Elpida, wire bonded on top of the APL0778 CPU
NFC controller from NXP
NFC booster chip from AMS
8 GB flash from SanDisk and Toshiba
Wireless charging chip from IDT
Touch controller from ADI
Integrated gyro/accelerometer from STMicroelectronics
BCM43342 Wi-Fi/FM/BT combo chip from Broadcom
Power management unit (PMU) from Dialog Semiconductor

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^[9]^[15]
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.^[15]
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^[15]