vol 6 issue 3

The Teardown: the Kinect for Xbox 360

14 March 2011
By iSuppli editorial
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Kinect for Xbox 360

Dimensions - Height: 73mm; Width: 283mm; Depth: 72.8mm; Weight: 564.5g

Inside the Kinect

Inside the Kinect

Kinect for Xbox 360

Prime Sense platform

Microsoft's motion-sensing controller is no loss-leader according to market research firm IHS iSuppli's analysis.

The Kinect for Xbox 360 is Microsoft's bid to respond to the controller incorporated in Nintendo's Wii games console. It seeks to extend the concept of 'immersive' play by using a technology that responds directly to body movement.

For example, a gamer playing a football game in front of the Kinect can control the avatars' body movements, 'kick' the ball or 'save' a penalty with his or her feet or hands. In addition, Kinect incorporates four microphones, which can pick up voice commands.

The device is bundled with sales of the Xbox 360 at a UK retail price of £229 for the 4GB version. A standalone unit is £120.

Watching you

Kinect consists of a set of visible and IR cameras that capture both 2D and 3D representations of the gamer directly in front of the device. This information is processed by a proprietary onboard image processor from Microsoft partner Prime Sense, and overlayed to the Xbox console as controller locations in 3D space.

From a physical design perspective, the Kinect resembles an oversized motorised webcam similar to those in enterprise video teleconference equipment. However, with only VGA resolution on both the IR (depth) and visible (colour) cameras, the bill of materials ($63.51 - £39.01) reflects consumer electronic pricing rather than that for premium capital goods such as office equipment. Overall component count is 1,088, of which 410 reside on the main printed circuit board (PCB) and 363 on the Image Sense PCB.

The primary cost drivers are the controls and proprietary image processing ICs from Prime Sense and also Marvell Technology. Note however that this analysis does not fully take into consideration licensing fees incurred by Microsoft for using Prime Sense's IP.

'We believe this licensing fee to be fairly significant and it would push the cost of goods of the Kinect – on Microsoft's accounting books – to a figure in line with other gross margins within their consumer electronics products,' says Wayne Lam of IHS iSuppli. 'Microsoft is likely making a profit on the Kinect accessory as opposed to the break-even business model typical of advanced gaming consoles.'

Design notes

The most prominent hardware features on the Kinect are the optical cameras. Since an IR camera requires an IR source to generate a depth image, an emitter is prominently mounted to the left of the colour and depth camera sensors.

The entire controller is mounted on a motorised pan/tilt platform with a MEMS-based three-axis accelerometer providing feedback controls. Also, the array of four microphones lined along the bottom panel pick up voice commands and, it is presumed, perform active noise suppression.

At the electronic core of the Kinect are the two control and image processing PCBs.

On the main PCB, Microsoft has a Marvell applications processor along with a 512MB DDR2 SDRAM package from Hynix. Also, there are a Renesas USB 2.0 hub controller chip and a pair of Wolfson Microelectronics stereo analogue-to-digital converters to support the microphones.

The Image Sense PCB contains the proprietary Prime Sense PS1080 image processor which performs most of the heavy lifting in 2D/3D image processing required to sense gamer controls. Also on this board is the motor driver for the tilt/pan controls.

Microsoft aims to bring the Kinect to PCs via its Windows operating system. The company is to release an initial SDK to software developers some time this Spring. *

IHS iSuppli provides teardowns for many leading electronics devices. Find out more at www.isuppli.com.

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Major Components

Processors/memory

PrimeSense, PS1080 image processor, system-on-chip, multi-sense, depth/colour image, audio stream, w. USB 2.0 interface $6.89

Marvell Technology, 88AP1-BJD2 applications processor $5.19

Hynix, H5PS5162FFK-E3C SDRAM, DDR2, 512Mb, 1.8V $1.15

Marvell Technology, regulator $0.70

Sensors/cameras

IR emitter module, value line item $4.20

Depth camera module, value line item, IR camera, SXGA, 1/2' format, CMOS, fixed lens $3.45

Colour camera module, value line item, 1.3MP, 1/4' format, CMOS, fixed lens $1.65

Wire harness, 12 discrete insulated wires, four microphone elements, one 12-position pin socket connector, heat shrink tubing, silicone rubber tubing $1.75

Audio

Wolfson Microelectronics, WM8737LGEFL analogue-to-digital converter, stereo, 24Bit, 96KHz, 97dB SNR, w. microphone preamplifier (quantity: 2) $1.40

Texas Instruments, TAS1020BPFB USB audio controller, 8-Bit 8052 core, 8K Bytes ROM, 6016+256 Bytes RAM, two GPIO ports, I2C interface, w. integrated USB transceiver $1.00

Other

AC adapter, 12V, 1.08A, w. 3.2mpPower cord, 0.4m USB cord, USB type-A plug, USB type-A receptacle and two magnetic filters $5.50

Eton Electronics, six-layer printed circuit board (PCB), FR4, lead-free $1.29

Wire harness, seven discrete insulated wires, w. USB/power combined plug connector, 1 dual-row six-position pin socket, two-position pin header, two-position pin socket, two magnetic filters and heat shrinks $1.10

Foxconn, six-layer PCB, FR4, lead-free $0.96

Internal mounting bracket, three pieces, stamped/formed aluminum and metal, four rivets, w. four threaded metal standoffs $0.84

Total (main components) $37.07

Total (all components) $60.74

Total (all components and manufacturing) $63.51

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