MXT641T datasheet(36/74 Pages) ATMEL

36 / 74 page

mXT641T 1.0 [Datasheet]

9917JX–AT42–02/15

HID-I2C Communications

11.

HID-I2C Communications

The device is an HID-I2C device presenting two Top-level Collections (TLCs):



Generic HID-I

2C – Provides a generic HID-I2C interface that allows the host to communicate with the device using

the object-based protocol (OBP).



Digitizer HID-I

2C – Supplies touch information to the host. This interface is supported by Microsoft Windows 8 and

8.1 without the need for additional software.

See Section 9. on page 29 for information on selecting HID-I

2C mode.

Other features are identical to standard I2C communication described in Section 10. on page 30.

Refer to the Microsoft HID-I2C documentation, HID Over I2C Protocol Specification – Device Side, for information on the

HID-I2C specification.

11.1

I2C Addresses

See Section 10.1 on page 30.

11.2

Device

The device is compliant with HID-I2C specification V1.0. It has the following specification:

Vendor ID:

0x03EB (Atmel)

Product ID:

0x214D (mXT641T)

Version:

16-bit Version & Build Identifier in the form 0xVVBB, where:

VV = Version Major (Upper 4 bits) / Minor (Lower 4 bits)

BB = Build number in BCD format

HID descriptor address: 0x0000

11.3

HID Descriptor

The host should read the HID descriptor on initialization to ascertain the key attribute of the HID device. These include

the report description and the report ID to be used for communication with the HID device. The HID descriptor address is

0x0000.

Note that the host driver must not make any assumptions about the report packet formats, data locations or report IDs.

These must be read from the HID descriptor as they may change in future versions of the firmware.

For more information on how to read the HID descriptor, refer to the Microsoft HID-I2C documentation.

11.4

HID-I2C Report IDs

Table 11-1 describes the HID-I2C report IDs used in reports sent to the host.

Table 11-1. HID-I2C Report IDs

Report ID

Description

Top-level Collection

0x06

Object Protocol (OBP) command and response

(see Section 11.5 on page 37)

Generic HID-I2C

0x01

Touch report

(see Section 11.6.1 on page 41)

Digitizer HID-I2C

0x02

Maximum Touches (Surface Contacts) report

(see Section 11.6.3 on page 44)

Digitizer HID-I2C

0x05

Touch Hardware Quality Assurance (THQA) report

(see Section 11.6.4 on page 44)

Digitizer HID-I2C

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