# Patent

## Title
Electronic device having a dual key connector

## Abstract

A connector interface system for a communication device is disclosed. The interface includes a docking connector. The docking connector includes first make/last break contacts that minimize internal damage to the internal electronics. The docking connector also includes specific keying arrangement to prevent noncompliant connectors from being plugged in, and thereby minimizes potential damage to the multi-communication device. The connector interface system also includes a remote connector which provides for the ability to output audio, input audio, provides I/O serial protocol, and to provide an output video. Embodiments of the present invention allow for a standard headphone cable to be plugged in but also for special remote control cables, microphone cables, video cables could be utilized in such a system. The connector interface system also includes a serial protocol to control device features. These controls help a user sort and search for data more efficiently within the device.

## Background
CROSS-REFERENCES TO RELATED APPLICATIONS
The present application claims priority from and is a continuation of U.S. Non-Provisional application Ser. No. 12/210,022, Sep. 12, 2008; which is a continuation of U.S. Non-Provisional application Ser. No. 10/833,689, Apr. 27, 2004. The entire contents of each are incorporated herein by reference for all purposes.
The contents of the following related applications are herein incorporated by reference in their entirety for all purposes:
(1) U.S. application Ser. No. 12/209,962, now U.S. Pat. No. 7,660,929, issued Feb. 9, 2010, entitled “CONNECTOR INTERFACE SYSTEM FOR A MULTI-COMMUNICATION DEVICE” and filed concurrently with the present application;
(2) U.S. application Ser. No. 12/209,970, now U.S. Pat. No. 7,587,540, issued Sep. 8, 2009, entitled “TECHNIQUES FOR TRANSFERRING STATUS INFORMATION BETWEEN AN ACCESSORY AND A MULTI-COMMUNICATION DEVICE” and filed concurrently with the present application; and
(3) U.S. application Ser. No. 12/209,993, now U.S. Pat. No. 7,702,833, issued Apr. 20, 2010, entitled “TECHNIQUES FOR TRANSFERRING INFORMATION BETWEEN AN ACCESSORY AND A MULTI-COMMUNICATION DEVICE” and filed concurrently with the present application.


FIELD OF THE INVENTION
The present invention relates generally to multi-communication devices and more particularly to a connector interface system for such devices.
BACKGROUND OF THE INVENTION
Multi-communication devices are utilized in a variety of environments. What is meant by a multi-communication device is a device such as MP3 player, or other type of device that receives video, audio, and a variety of other digital data and can provide an output of the data. As these devices proliferate, a connector interface specification becomes more important, and also insuring that a particular multi-communications device interfaces appropriately with the appropriate external devices becomes more important.
In a typical connector interface, there is a docking connector that allows for the docking of the multi-communications device to a docking station for another type of communication for the device. A multi-communication device also typically includes a remote connector with the ability to output audio. As more multi-media content becomes available (i.e., digital video graphics, etc.) it is desirable to have a multi-media device which can effectively input and output such data.
Finally, such an interface typically has some sort of protocol to control device features from an external device and it also is desirable for the protocol to help the user sort and search for data faster and in an efficient manner. Heretofore, there is no device that includes features that overcome many of the above-stated problems. What is desired is a connector interface system which is utilized in such a device to address all the above-identified issues. The present invention addresses such a need.
SUMMARY OF THE INVENTION
A connector interface system for a communication device is disclosed. The interface includes a docking connector. The docking connector includes first make/last break contacts that minimize internal damage to the internal electronics. The docking connector also includes specific keying arrangement to prevent noncompliant connectors from being plugged in, and thereby minimizes potential damage to the multi-communication device. The connector interface system also includes a remote connector which provides for the ability to output audio, input audio, and output video using an I/O serial protocol. Heretofore, all these features have not been implemented in a connector. Therefore, this would allow for a standard headphone cable to be plugged in but also for special remote control cables, microphone cables, video cables to be utilized in such a system. The connector interface system also includes a serial protocol to control device features. These controls help a user sort and search for data more efficiently within the device.



BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1A and 1B illustrate a docking connector in accordance with the present invention.
FIGS. 2A-2C illustrate the remote connector in accordance with the present invention.
FIG. 3A illustrates the connection pin designations for the docking connector.
FIG. 3B illustrates the connection pin designations for the remote connector.
FIG. 4A illustrates the Firewire connector interface.
FIG. 4B illustrates the USB connector interface.
FIG. 4C illustrates a reference schematic diagram for accessory detect and identify system for detecting and identifying accessories for the docking connector.
FIG. 4D is a reference schematic of an electret microphone that is within the remote connector.



DETAILED DESCRIPTION
The present invention relates generally to multi-communication devices and more particularly to a connector interface system for such devices. The following description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements. Various modifications to the preferred embodiment and the generic principles and features described herein will be readily apparent to those skilled in the art. Thus, the present invention is not intended to be limited to the embodiment shown but is to be accorded the widest scope consistent with the principles and features described herein.
Connector System Overview
To describe the features of the connector system in accordance with the present invention in more detail, refer now to the following description in conjunction with the accompanying drawings.
Docking Connector
FIGS. 1A and 1B illustrate a docking connector 100 in accordance with the present invention. Referring first to FIG. 1A, the keying features 102 are of a custom length 104. In addition, a specific key arrangement where one set of keys are separated by one length are at the bottom and another set of keys are separated by another length at the top of the connector is used. The use of this key arrangement prevents noncompliant connectors from being plugged in and causing potential damage to the device. The connector for power utilizes a Firewire specification for power. The connector includes a first make/last break contact to implement this scheme. FIG. 1B illustrates the first make/last break contact 202 and also illustrates a ground pin and a power pin related to providing an appropriate first mate/last break contact. In this example, the ground pin 204 is longer than the power pin 206. Therefore, the ground pin 204 would contact its mating pin in the docking accessory before the power pin 206. Therefore internal electrical damage of the electronics of the device is minimized.
In addition, a connector interface system in accordance with the present invention uses both USB and Firewire interfaces as part of the same docking connector alignment, thereby making the design more compatible with different types of interfaces, as will be discussed in detail hereinafter. In so doing, more remote systems and devices can interface with the multi-communication device.
Remote Connector
The connection interface system also includes a remote connector which provides for the ability to output audio, input audio, and output video using an I/O serial protocol. FIG. 2A is a front and top view of a remote connector 200 in accordance with the present invention. As is seen, the remote connector 200 includes a top headphone receptacle 202, as well as, a second receptacle 204 for remote devices. FIG. 2B illustrates a plug 300 to be utilized in the remote connector. The plug 300 allows the features to be provided via the remote connector. FIG. 2C illustrates the plug 300 inserted into the remote connector 200. Heretofore, all these features have not been implemented in a remote connector. Therefore, a standard headphone cable can be plugged in but also special remote control cables, microphone cables, video cables could be utilized with the remote connector.
Serial Protocol
The connector interface system also includes a serial protocol. The protocol is utilized to allow external devices to control the multi-communication device. These controls help a user sort and display for data more efficiently utilizing the device. A representation list of controls includes, but are not limited to:
Next album
Previous album
Next chapter
Previous chapter
Next play list
Previous play list
Shuffle setting advance
Repeat setting advance
Backlight for 30 seconds
Begin fast forward
Begin rewind
To describe the features of the connector interface system in more detail, please find below a functional description of the docking connector, remote connector and a serial protocol in accordance with the present invention.
Docking and Remote Connector Specifications
For an example of the connector pin designations for both the docking connector and for the remote connector for a multi-communication device such as an iPod device by Apple Inc., refer now to FIGS. 3A and 3B. FIG. 3A illustrates the connector pin designations for the docking connector. FIG. 3B illustrates the connection pin designations for the remote connector.
Docking Connector Specifications
FIG. 4A illustrates a typical FireWire connector interface for the docking connector:
FireWire Power:

    
    
        a) 8V-30V DC IN
        b) 10 W Max
    
    


FireWire:

    
    
        a) Designed to IEEE 1394 A Spec (400 Mb/s)
    
    


FIG. 4B illustrates the USB connector interface.
USB 2.0:

    
    
        a) Designed to USB 2.0 High Speed Spec
        b) The USB Power (pin 8 on the 30-pin connector) is not used for powering device; only used to detect a USB host connection.
    
    


FIG. 4C illustrates a reference schematic diagram for accessory detect and identify system for detecting and identifying accessories for the docking connector. The system comprises:

    
    
        a) A simple resistor to ground allows the device to determine what has been plugged into docking connector. There is an internal pullup on Accessory Identify.
        b) Two pins required (Accessory Identify & Accessory Detect)
    
    


Serial Protocol Communication:

    
    
        a) Two pins are used to communicate to and from device (Rx & Tx)
        b) Input & Output (0V=Low; 3.3V=High)
        c) A device with an identity resistor (ID #13) is a serial dock accessory.
    
    


A device coupled to the docking connector allows for a standard serial protocol to be utilized. Attaching a serial dock accessory makes any top-attached (remote connector) accessories inactive.
Line Level Input (Left & Right):

    
    
        a) Stereo audio input b) Input Level 1V RMS (max)
        a) Chassis ground is tied to specified pins
        b) Digital ground should not be tied to Audio Return

Remote Connector Specifications

    
    


Audio Out:

    
    
        a) Stereo Output per channel volume controlled by device
    
    


Mono Mic In:

    
    
        a) Mono mic in through Left channel
        b) Filtered electret power supplied by internal device
    
    


FIG. 4D is a reference schematic of an electret microphone that is within the remote connector.
Serial Protocol Communication:

    
    
        a) Two pins used to communicate to and from device (Rx & Tx)
        b) Input & Output (0V=Low, 3.3V=High)

Serial Protocol

Protocol Generalities

    
    


As previously mentioned, another feature of the present invention is the use of a serial protocol for allowing features to be implemented for remote devices. In a preferred embodiment, the protocol builds upon a signaling protocol, such as the RS-232 serial specification. However, the signaling levels are nonstandard. In true RS-232, a mark is −7V and a space is 7V. In this protocol, a mark is 3.3V and a space is 1V. The signaling rate for this protocol is 19,200 bps. All signaling is at 8 bits data, no parity and one stop bit (8-N-1).
This protocol is to be used in both directions of a link. Every device is encouraged to implement both sending and receiving capabilities. It is be possible to determine the direction (host to device or device to host) of a packet from its contents only. This means that no packet is valid for sending from both the host and device.
All devices must be able to handle variable-length packets. For example, even though an identify packet currently has no defined data, a device must be able to understand an identify packet with data and should respond to the best of its ability. It must at least not lose sync to the packet signaling.
Lingo Specifications














Lingo
ID









General
0x00



Microphone
0x01



Simple Remote
0x02



Display Remote
0x03



RF transmitter
0x05










The general lingo is shared for housekeeping commands across all devices. The microphone lingo is used by the remote connector on the multi-communication device. The simple remote lingo is used by a standard in-line remote control. The display remote lingo is reserved for a device with similar functionality to the standard remote but with a display for status.
General Lingo Specification















Command
ID
Data Length









Request identify
0x00
0x00



Identify
0x01
0x01+










The host may send a request identify to the device to ask the device to reidentify itself.
The device sends an identify packet to identify itself. At this time multifunction (combo) devices are not supported. The identify data payload is thus the command ID 0x01 followed by a single byte of the same value as the lingo specification of the functionality the device implements unless specified otherwise. The identify packet returned in response to a request identify packet does not need to have the extra sync bytes and delays used during the startup process.
Simple Remote Lingo Specification















Command
ID
Data Length









Buttons status
0x00
0x00+










A simple remote device sends a buttons status command to indicate an updated status of which buttons are held down. The data of the packet is a number of bytes indicating which buttons are currently held down. The bytes are made up by ORing the masks of the buttons together. The device will send a 0x00 in data (or no data) to indicate all buttons are released. While any buttons are held down the device should repeat this packet on a predetermined interval. If no packet of this sort is received by the host for 200 ms the host may assume a packet was lost and go to “all buttons up” mode.
A representative simple remote button map is shown below:
Simple Remote Button Map















Button
Number
Byte No, Mask




















Play/Pause
0
0, 0x01



Volume Up
1
0, 0x02



Volume Down
2
0, 0x04



Next Track
3
0, 0x08



Previous Track
4
0, 0x10



Next Album
5
0, 0x20



Previous Album
6
0, 0x40



Stop
7
0, 0x80



Play/Resume
8
1, 0x01



Pause
9
1, 0x02



Mute toggle
10
1, 0x04



Next Chapter
11
1, 0x08



Previous Chapter
12
1, 0x10



Next Playlist
13
1, 0x20



Previous Playlist
14
1, 0x40



Shuffle setting advance
15
1, 0x80



Repeat setting advance
16
2, 0x01



Power On
17
2, 0x02



Power Off
18
2, 0x04



Backlight for 30 seconds
19
2, 0x08



Begin FF
20
2, 0x10



Begin REW
22
2, 0x20










The use of the button remote map allows for features that heretofore have not been utilized in multi-communication devices such as an iPod device manufactured by Apple Inc.
A connector interface system for a communication device is disclosed. The interface includes a docking connector. The docking connector includes first make/last break contacts that minimize internal damage to the internal electronics. The docking connector also includes specific keying arrangement to prevent noncompliant connectors from being plugged in, and thereby minimizes potential damage to the multi-communication device. The remote connector provides for the ability to output audio, input audio, and output video using an I/O serial protocol. The connector interface also includes a serial protocol to control device features. These controls help a user sort and search for data more efficiently within the device.
Although the present invention has been described in accordance with the embodiments shown, one of ordinary skill in the art will readily recognize that there could be variations to the embodiments and those variations would be within the spirit and scope of the present invention. Accordingly, many modifications may be made by one of ordinary skill in the art without departing from the spirit and scope of the appended claims.

## Claims

1. An electronic device having an electronic connector, the electronic connector comprising:
a keying arrangement having first and second sets of keys, the first set of keys being spaced apart by a first length and the second set of keys being spaced apart by a second length different than the first length; and
a plurality of contacts including first, second and third ground contacts, first and second power contacts, an accessory power contact, a USB power contact, a plurality of USB signal contacts and left and right audio out contacts;
wherein when the electronic connector mates with a corresponding second connector associated with an accessory device, at least one of the contacts is active and the first, second and third ground contacts make contact with ground contacts in the second connector before the accessory power contact makes contact with an accessory power contact in the second connector.

2. The electronic device set forth in claim 1 wherein the plurality of contacts consists of thirty contacts in sequentially numbered contact locations, and wherein the first, second and third ground contacts are at contact locations 2, 16 and 29, respectively.

3. The electronic device set forth in claim 1 wherein the electronic connector further comprises an accessory detect contact.

4. The electronic device set forth in claim 1 wherein the plurality of USB signal contacts include a USB D+ signal contact and a second USB D− signal contact.

5. The electronic device of claim 1 wherein the accessory power contact provides power out at a first power level and the first and second power input contacts receive a power in at a second power level that is higher than the first power level.

6. The electronic device set forth in claim 1 wherein the electronic connector further comprises first and second serial communication contacts for transmitting and receiving digital signals with an accessory device using a serial protocol.

7. The electronic device set forth in claim 1 wherein the plurality of contacts comprises thirty contacts in sequentially numbered contact locations, and wherein the first, second and third ground contacts are at contact locations 1, 16 and 30, respectively.

8. The electronic device set forth in claim 4 wherein another digital signal contact is positioned between the USB D+ and USB D− signal contacts.

9. The electronic device of claim 5 wherein the first power level is 3.3 volts.

10. The electronic device set forth in claim 6 wherein the electronic connector further comprises an accessory identify contact.

11. The electronic device set forth in claim 6 wherein the plurality of contacts comprise thirty contacts in sequentially numbered contact positions, and wherein the first ground contact is at contact location 2, the third ground contact is at contact location 29, and the second ground contact is between the first and third ground contacts.

12. The electronic device set forth in claim 7 wherein the first and second power contacts, accessory power contact and USB power contact are located at contact locations between the first and second ground contacts.

13. The electronic device set forth in claim 7 wherein the sequentially numbered contact locations further include fourth and fifth ground contacts designated for ground, the fourth ground contact being disposed at contact location 2 and the fifth ground contact location being disposed at contact location 15.

14. The electronic device set forth in claim 7 wherein the left and right audio out contacts are at contact locations between the second and third ground contacts.

15. The electronic device set forth in claim 7 wherein the left and right audio out contacts are at contact locations 27 and 28, respectively.

16. The electronic device set forth in claim 7 wherein the electronic connector further comprises an accessory detect contact.

17. The electronic device set forth in claim 8 wherein the another digital signal contact is a Firewire signal contact.

18. The electronic device set forth in claim 9 further comprising fourth, fifth and sixth ground contacts.

19. The electronic device set forth in claim 10 wherein the electronic connector further comprises a resistor coupled between the accessory identify contact and ground.

20. The electronic device set forth in claim 11 wherein the electronic connector further comprises left and right audio in contacts.

21. The electronic device set forth in claim 12 wherein the plurality of USB signal contacts are located at contact locations between the first and second ground contacts.

22. The electronic device set forth in claim 13 wherein the first and second power contacts, accessory power contact, USB power contact and the plurality of USB signal contacts are located at contact locations between the first and second ground contacts.

23. The electronic device set forth in claim 16 wherein the electronic connector further comprises an accessory identify contact.

24. The electronic device set forth in claim 8 wherein the plurality of contacts consists of thirty contacts in sequentially numbered contact locations, and wherein the first, second and third ground contacts are at contact locations 2, 16 and 29, respectively.

25. The electronic device set forth in claim 22 wherein the USB power contact is at contact location 8.

26. The electronic device set forth in claim 23 wherein the electronic connector further comprises a resistor coupled between the accessory identify contact and ground.

27. The electronic device set forth in claim 23 wherein the electronic connector further comprises first and second serial communication contacts for transmitting and receiving digital signals with an accessory device using a serial protocol, wherein the first and second serial communication contacts are located at contact locations between the second and third ground contacts.

28. The electronic device set forth in claim 24 further comprising fourth, fifth and sixth ground contacts.

29. The electronic device set forth in claim 27 wherein the first and second serial communication contacts are located at contact locations between the second ground contact and the left and right audio out contacts.

30. The electronic device set forth in claim 28 wherein when the electronic connector mates with a corresponding second connector associated with an accessory device, the fourth, fifth and sixth ground contacts make contact with ground contacts in the second connector before the accessory power contact makes contact with an accessory power contact in the second connector.

31. The electronic device of claim 28 wherein the accessory power contact provides power out at a first power level and the first and second power input contacts receive power in at a second power level that is higher than the first power level.

32. The electronic device of claim 31 wherein the first power level is 3.3 volts.

33. The electronic device set forth in claim 31 wherein the electronic connector further comprises a contact at location 20 that can be used to detect if an accessory is connected to the electronic connector.

34. An electronic device having an electronic connector, the electronic connector comprising:
a keying arrangement having first and second sets of keys, the first set of keys arranged at a top of the connector and spaced apart by a first length and the second set of keys arranged at a bottom of the connector and spaced apart by a second length different than the first length; and
a plurality of contacts including first, second and third ground contacts, first and second power contacts, an accessory power contact, a USB power contact, a plurality of USB signal contacts and left and right audio out contacts;
wherein the accessory power contact provides power out at a first power level and the first and second power input contacts receive a power in at a second power level that is higher than the first power level; and
wherein the ground contacts are longer than the accessory power contact so that when the electronic connector mates with a corresponding second connector associated with an accessory device, the ground contacts make contact with ground contacts in the second connector before the accessory power contact makes contact with an accessory power contact in the second connector.

35. The electronic device set forth in claim 34 wherein the plurality of contacts comprises thirty contacts in sequentially numbered contact positions, and wherein the first and third ground contacts are at contact locations 2 and 29 and the second ground contact is between the first and third ground contacts.

36. The electronic device set forth in claim 35 wherein the plurality of USB signal contacts includes a USB D+ signal contact and a second USB D− signal contact and wherein another digital signal contact is positioned between the USB D+ and USB D− signal contacts.

37. The electronic device of claim 36 wherein the first power level is 3.3 volts.

38. The electronic device of claim 37 wherein the plurality of contacts further includes fourth, fifth and sixth ground contacts.