MXT1664T3-C2TESSQTP datasheet(50/98 Pages) MICROCHIP

50 / 98 page

MXT1664T3 2.0

DS40002054A-page 50

 2018 Microchip Technology Inc.

The composite device has one bidirectional endpoint: the Control Endpoint (Endpoint 0). It is used by the USB Host to

interrogate the USB device for details on its configurations, interfaces and report structures. It is also used to apply

general device settings relating to USB Implementation.

10.3

USB Report IDs

Table 10-3 describes the USB report IDs used in reports sent to the host.

10.4

Interface 0 (Generic HID)

Interface 0 is a Generic Human Interface Device, compliant with HID specification 1.11 with amendments (an

implementation of Microsoft’s USB HID specification for multitouch digitizers).

Interface 0 consists of two endpoints: an interrupt-In endpoint (Endpoint 1) and an interrupt-out endpoint (Endpoint 2).

The data packet in each case contains a 1-byte USB report ID followed by 63 bytes of data, totaling 64 bytes (see

Figure 10-2).

FIGURE 10-2:

GENERIC HID – DATA PACKET FORMAT

Commands are sent by the application software over the Interrupt-out endpoint, Endpoint 2. The command is sent as

the first data byte of the packet data (data byte 0), followed by conditions and/or data.

The supported commands are as follows:

• Read/write Memory Map

• Send Auto-return messages

• Start debug monitoring

• End debug monitoring

Responses from the device are sent via the Interrupt-In endpoint, Endpoint 1.

The USB report ID used is that for Object Protocol commands and responses; see Table 10-3 for the value.

10.4.1

READ/WRITE MEMORY MAP

This command is used to carry out a write/read operation on the memory map of the device.

NOTE

The term USB 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 10-3:

USB REPORT IDS

Report ID

Description

HID Interface

0x01

Object Protocol (OBP) command and response

(see Section 10.4 “Interface 0 (Generic HID)”)

Generic HID

0x02

Additional OBP report ID for debug data

(see Section 10.4.3 “Start Debug Monitoring”)

Generic HID

0x01

Touch report

(see Section 10.5.1 “Touch Report”)

Digitizer HID

0x02

Maximum Touches (Surface Contacts) report

(see Section 10.5.2 “Maximum Touches Report”)

Digitizer HID

0x05

Touch Hardware Quality Assurance (THQA) report

(see Section 10.5.3 “Touch Hardware Quality Assurance

(THQA) Report”)

Digitizer HID

Report ID

Rpt ID

Data 62

Data 0

...

Packet Data

(63 Bytes)

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