MXT1664T3-ABESSQTP datasheet(57/98 Pages) MICROCHIP

57 / 98 page

MXT1664T3 2.0

 2018 Microchip Technology Inc.

DS40002054A-page 57

10.5

Interface 1 (Digitizer HID)

Interface 1 is a Digitizer-class HID, compliant with HID specification 1.11 with amendments (an implementation of

Microsoft’s USB HID specification for multitouch digitizers).

This interface consists of a single interrupt-In endpoint (Endpoint 3).

10.5.1

TOUCH REPORT

The format of a Touch report is shown in Figure 10-20.

FIGURE 10-20:

TOUCH REPORT PACKET

In Figure 10-20:

• Rpt ID is the report ID for Touch reports (see Table 10-3 on page 50).

• Active Touch Status Data are 5 sets of data (11 bytes each) that describe the status of up to 5 active touches.

Any unused touch data bytes are set to zero.

• Scan Time is the timestamp associated with the report frame (in units of 100 µs).

• Count is the number of active touches in this Touch report.

If there are more than five active touches to be reported, a further report is sent with the remaining touch data. In this

case, the count (for all touches) is sent in the first count byte and the count byte in the last report is zero.

An example of the input report packets for 7 active touches is shown in Figure 10-21.

FIGURE 10-21:

EXAMPLE TOUCH REPORT PACKETS FOR 7 ACTIVE TOUCHES

The Touch report format depends on the geometry calculation field (TCHGEOMEN) of the Digitizer HID Configuration

T43 object. Table 10-4 and Table 10-5 on page 58 give the detailed format of an Touch report packet.

TABLE 10-4:

TOUCH REPORT FORMAT WHEN TCHGEOMEN IS ENABLED

Byte

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

USB Report ID

Touch ID (first touch)

Reserved

Status

Touch X Position LSByte (first touch)

Touch X Position MSBits (first touch)

Touch Center X Position LSByte (first touch)

Touch Center X Position MSBits (first touch)

Touch Y Position LSByte (first touch)

Touch Y Position MSBits (first touch)

Touch Center Y Position LSByte (first touch)

Touch Center Y Position MSBits (first touch)

Active Touch Status Data

Rpt ID

Scan Time

Packet

Count

LSByte MSByte Count

Reserved

(5 Bytes)

0x00

Touch 1

(11 Bytes)

Data

Touch 2

(11 Bytes)

Touch 3

(11 Bytes)

Touch 4

(11 Bytes)

Touch 5

(11 Bytes)

Touch 1

(11 Bytes)

Touch 3

(11 Bytes)

Touch 4

(11 Bytes)

Touch 5

(11 Bytes)

Touch 2

(11 Bytes)

Unused Touch Data Bytes

(33 Bytes)

0x00

Scan Time

Packet

Count

Touch 6

(11 Bytes)

LSB

MSB Count = 0

Rpt ID

Data

LSB

MSB Count = 7

Rpt ID

Unused

(5 Bytes)

0x00

Data

Touch 7

(11 Bytes)

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