MXT1664T3-ABESQTP datasheet(40/98 Pages) MICROCHIP

40 / 98 page

MXT1664T3 2.0

DS40002054A-page 40

 2018 Microchip Technology Inc.

9.0

HID-I2C COMMUNICATIONS

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

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

the object-based protocol (OBP).

• Digitizer HID-I2C – Supplies touch information to the host. This interface is supported by Microsoft Windows

without the need for additional software.

See Section 7.0 “Host Communications” for information on selecting HID-I2C mode.

Other features are identical to standard I2C communication described in Section 8.0 “I2C Communications”.

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

the HID-I2C specification.

9.1

I2C Addresses

See Section 8.1 “I2C Addresses”.

9.2

Device Specification

The device is compliant with HID-I2C specification V1.0. It has the specification shown in Table 9-1.

9.3

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.

9.4

HID-I2C Report IDs

Table 9-2 describes the HID-I2C report IDs used in reports sent to the host.

TABLE 9-1:

DEVICE SPECIFICATION

Parameter

Value

Vendor ID

0x03EB (Microchip)

Product ID

0x215D (mXT1664T3)

Version ID

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

NOTE

The term HID-I2C report ID should not be confused with the term report Id as used in the Object Protocol;

the two are entirely different concepts. Refer to the mXT1664T3 2.0 Protocol Guide for more information

on the use of Object Protocol report IDs.

TABLE 9-2:

HID-I2C REPORT IDS

Report ID

Description

Top-level Collection

0x06

Object Protocol (OBP) command and response

(see Section 9.5 “Generic HID-I2C TLC”)

Generic HID-I2C

0x01

Touch report

(see Section 9.6.1 “Touch Report”)

Digitizer HID-I2C

0x02

Maximum Touches (Surface Contacts) report

(see Section 9.6.3 “Maximum Touches Report”)

Digitizer HID-I2C

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