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Accessory Interface
Specification
Release R28
Contents
Introduction 60
1. Introduction 61
1.1 Purpose of This Specification 61
1.2 Organization 61
1.3 Applicability 62
1.4 Requirements, Recommendations, and Permissions 63
1.5 Developer Preview 63
1.6 Manufacturer Preview 64
1.7 Terminology 64
1.7.1 Accessory, Device, and Product 64
1.7.2 Authentication Coprocessor 64
1.7.3 I
2
C Bus 64
1.7.4 Challenge 65
1.7.5 Challenge Response 65
1.7.6 X.509 Certificate 65
1.7.7 Component 65
1.7.8 Direct User Action 65
1.7.9 Feature 66
1.7.10 USB Device Mode and USB Host Mode 66
1.7.11 iAP 66
Accessories 67
2. All Accessories 68
2.1 Minimum Apple Device Compatibility 68
2.2 Development Tools and Emulators 69
2.3 Reference Designs & Development Kits 69
2.4 Accessory Authentication and Accessory Identification 70
2.5 iAP 70
2.6 Connector Modifications 70
2.7 Connector Assemblies 71
2.8 Adapters and Proxies 71
2017-12-21 | Copyright © 2017 Apple Inc. All Rights Reserved.
2
2.9 Mixed Headset Jack and Lightning Connectors 71
2.10 Apple USB Power Adapters 71
2.11 Apple Watch Magnetic Charging Cable 71
2.12 Apple Watch Lug 71
2.13 Apple Device Detection 72
2.14 Multiple Simultaneous iAP2 Connections 72
2.15 Disconnecting and Reconnecting 72
2.16 Presentation of Apple Device Updates 72
2.17 Relationships Between Multiple Accessories 73
2.18 iBeacon 73
2.19 Feature Duplication 73
2.20 Temperature Range 74
2.21 Integrated USB Receptacles 74
2.21.1 USB-C Receptacle 74
2.22 Integrated Non-USB Receptacles 76
2.23 User Supplied Cables and Power Supplies 76
2.24 Removable Storage 76
2.25 TDMA Noise 77
2.26 Attachments 77
2.27 Magnetic Interference 77
2.28 Radio Frequency (RF) Performance 77
2.28.1 Materials and Coatings 77
2.28.2 Antenna Keep-Out 78
2.28.3 Over The Air (OTA) 78
2.28.4 Near Field Communication (NFC) 79
2.29 Qi Wireless Power 79
2.30 Test Procedures 79
2.30.1 RF (OTA) 79
3. Cases 92
3.1 Product Design 92
3.1.1 Device Protection 92
3.1.2 Access to Inputs and Interconnects 93
3.1.3 Dock Compatibility 95
3.2 Acoustics 95
3.2.1 Call Quality 95
3.2.2 Speaker to Microphone Coupling 95
3.2.3 Speaker/Microphone Openings 96
3.3 Ambient Light Sensor and Proximity Sensor Interference 98
2017-12-21 | Copyright © 2017 Apple Inc. All Rights Reserved.
3
Contents
3.4 Taptic Engine 98
3.5 Magnetic Interference 99
3.6 Home Button / Touch ID Sensor 99
3.7 Camera 99
3.7.1 Geometry 99
3.7.2 Color 100
3.7.3 Surface Finish 100
3.7.4 Image Degradation Examples 100
3.8 Reliability 101
3.8.1 Device Insertion and Removal 101
3.8.2 Colorfastness 101
3.9 Environmental 102
3.10 Test Procedures 102
3.10.1 Required Apple Device Models 102
3.10.2 Product Design 106
3.10.3 Taptic Engine 108
3.10.4 Home Button / Touch ID Sensor Overlays 109
3.10.5 Acoustics 110
4. Camera Attachments 112
4.1 Magnetic Interference 112
5. Covers 113
5.1 Magnetic Interference 113
5.2 Smart Covers 113
6. Screen Overlays 114
6.1 Product Design 114
6.2 Edge Swipe Gestures 114
6.3 Edge Press Gestures 114
7. Cables 115
7.1 All Cables 115
7.1.1 USB-C to Micro-USB Adapters 115
7.1.2 Cable Encapsulation 116
7.2 Captured Cables 116
7.3 Lightning Charge/Sync Cables (Lightning to USB-A) 116
7.4 Lightning Accessory Cables (Lightning to USB-B) 117
7.5 Lightning Audio Headset Cables (Lightning to UAC) 117
7.6 Lightning Audio Headset Cables (3.5 mm Headset Plug to UAC) 117
2017-12-21 | Copyright © 2017 Apple Inc. All Rights Reserved.
4
Contents
7.7 Lightning Audio Headset Cables (USB-A to UAC) 117
7.8 Lightning Audio Headset Cables (USB-C to UAC) 118
7.9 Lightning Audio Headset Cables (Lightning to Analog Headset Plug) 118
7.10 Lightning to 3.5 mm Stereo Analog Audio Output Cable 118
7.11 3.5 mm Headset Cables 119
7.12 Proprietary Cables (Lightning to Proprietary Connector) 119
7.12.1 Lightning Audio Accessory Cables 119
8. Docks 120
8.1 Backstop 120
8.2 Flexible Mechanism 121
8.3 Rests 122
8.4 Sideways Disconnect 123
8.5 Test Procedures 124
8.5.1 iPhone and iPod touch Docks 124
8.5.2 iPad Docks 125
9. Dongles 127
9.1 Lightning Dongles 127
9.2 Lightning to Micro-USB Adapters 127
9.3 Product Design 128
9.4 Test Procedures 129
9.4.1 Break / Bend Test 129
10. Headsets 130
10.1 Product Design 130
10.2 Audio and Data Interfaces 130
10.3 Remote Controls 131
10.4 Native Voice Recognition 131
10.5 Bundled Extension Cables and Adapters 132
10.6 Test Procedures 133
10.6.1 Product Design 133
10.6.2 Headset Plug 133
10.6.3 Lightning 134
10.6.4 Bluetooth 135
10.6.5 Microphone 135
10.6.6 Controls 135
10.6.7 Native Voice Recognition 136
10.6.8 Audio Quality 136
10.6.9 Bundled Extension Cables and Adapters 136
2017-12-21 | Copyright © 2017 Apple Inc. All Rights Reserved.
5
Contents
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