MXT1664T3-ABESSQTP datasheet(46/98 Pages) MICROCHIP

46 / 98 page

MXT1664T3 2.0

DS40002054A-page 46

 2018 Microchip Technology Inc.

9.6

Digitizer HID-I2C

This is a digitizer class HID.

9.6.1

TOUCH REPORT

The format of a Touch report is shown in Figure 9.6.2. Each Touch report is 18 bytes long and contains the data for one

touch.

9.6.2

TOUCH REPORT PACKET FORMAT

In Figure 9.6.2:

• Rpt ID is the HID-I2C report ID used for Touch reports (see Table 9-2 on page 40).

• Touch is the data for the touch.

• Scan Time is the Timestamp for the report packet

• Count is used to identify the report packets for current active touches that are to be reported as a single package.

The Count in the first packet for the first touch is set to the number of active touches to be sent in one package

(that is, the number of packets). Subsequent packets for subsequent active touches have a Count of 0.

An example of the Touch report packets for 3 active touches is shown in Figure 9-14.

FIGURE 9-14:

EXAMPLE TOUCH REPORT PACKETS FOR 3 ACTIVE TOUCHES

Each input report consists of a HID-I2C report ID followed by 17 bytes that describe the status of one active touch. The

input report format depends on the geometry calculation control (TCHGEOMEN) of the Digitizer HID Configuration T43

object. Table 9-3 and Table 9-4 on page 47 give the detailed format of a touch report packet.

Touch Status Data

(14 Bytes)

Scan Time

Data 0

Data 13

Count

ST LSByte

ST MSByte

...

Rpt ID

Packet

Count

TABLE 9-3:

TOUCH REPORT FORMAT WHEN TCHGEOMEN = 1

Byte

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0HID-I2C Touch Report ID

Reserved

Status

Touch ID

Touch X Position LSByte (first touch)

Reserved

Touch X Position MSBits (first touch)

Touch Center X Position LSByte (first touch)

Reserved

Touch Center X Position MSBits (first touch)

Touch Y Position LSByte (first touch)

Reserved

Touch Y Position MSBits (first touch)

Touch Center Y Position LSByte (first touch)

Reserved

Touch Center Y Position MSBits (first touch)

Packet

Count

Touch Status Data

Touch 3

Touch 2

Touch 1

Scan Time

Data 0

Data 13

Count = 0

ST LSByte

ST MSByte

...

Rpt ID

Data 0

Data 13

Count = 0

ST LSByte

ST MSByte

...

Rpt ID

Data 0

Data 13

Count = 3

ST LSByte

ST MSByte

...

Rpt ID

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