MXT1664T3-ABESSQTP datasheet(48/98 Pages) MICROCHIP

48 / 98 page

MXT1664T3 2.0

DS40002054A-page 48

 2018 Microchip Technology Inc.

9.6.3

MAXIMUM TOUCHES REPORT

Read this report to receive the maximum number of touches (surface contacts) that can currently be reported.

Write this report to set the maximum number of touches to be reported.

The format of the Maximum Touches report packet is shown in Figure 9-15. Each Maximum Touch report is 18 bytes

long and contains a single byte giving the maximum number of touches to be reported.

FIGURE 9-15:

MAXIMUM TOUCHES REPORT FORMAT

In Figure 9-15:

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

• Max Touch is the maximum number of touches to be reported by the device.

9.6.4

TOUCH HARDWARE QUALITY ASSURANCE (THQA) REPORT

The THQA data is reported to Microsoft Windows using the THQA report ID (see Table 9-2 on page 40 for the value).

The content of this data is defined by Microsoft.

9.7

CHG Line

The CHG line is used to implement the HID-I2C interrupt line. It provides a level triggered interrupt to the host to indicate

when there is one or more reports to be read. The CHG line will be pulled low when a report is ready and will remain

low as long as there are further reports to be read. Once the last report is read the CHG line will go high.

9.8

SDA, SCL

Identical to standard I2C operation. See Section 8.7 “SDA and SCL”.

9.9

Clock Stretching

Identical to standard I2C operation. See Section 8.8 “Clock Stretching”.

9.10

Power Control

The mXT1664T3 supports the use of the HID-I2C SET POWER commands to put the device into a low power state.

9.11

Microsoft Windows Compliance

The mXT1664T3 has algorithms within the Multiple Touch Touchscreen T100 object specifically to ensure compliance

with Microsoft Windows 8.x and later versions.

The device also supports Microsoft Touch Hardware Quality Assurance (THQA) in the Serial Data Command T68 object.

Refer to the Microsoft whitepaper How to Design and Test Multitouch Hardware Solutions for Windows 8.

These, and other device features, may need specific tuning.

NOTE

The number of touches cannot be set to more than the maximum number of touches configured in the

device by the Multiple Touch Touchscreen T100 object.

Maximum

Number of

Touches

Reported

Max Touch

Reserved

(16 Bytes)

0x00

...

Rpt ID

NOTE

In order to comply with the HID-I2C specification, Communications Configuration T18 MODE should be

set to 0.

MXT1664T3-ABESSQTP Datasheet(PDF) 48 Page - Microchip Technology

MXT1664T3-ABESSQTP Datasheet(HTML) 48 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98

Datasheet Download

Link URL