MXT1664T3-C2TESSQTP datasheet(66/98 Pages) MICROCHIP

66 / 98 page

MXT1664T3 2.0

DS40002054A-page 66

 2018 Microchip Technology Inc.

12.2.3

CONFIGURING AND TUNING THE DEVICE

The objects are designed such that a default value of zero in their fields is a “safe” value that typically disables

functionality. The objects must be configured before use and the settings written to the non-volatile memory using the

Command Processor T6 object.

Perform the following actions for each object:

Enable the object, if the object requires it.

Configure the fields in the object, as required.

Enable reporting, if the object supports messages, to receive messages from the object.

12.3

Writing to the Device

The following mechanisms can be used to write to the device:

• Using an I2C write operation (see Section 8.2 “Writing To the Device”).

• Using the USB Generic HID write operation (see Section 10.4.1.2 “Writing To the Device”).

• Using the Generic HID-I2C write operation (see Section 9.5.1.2 “Writing To the Device”).

Communication with the device is achieved by writing to the appropriate object:

• To send a command to the device, an appropriate command is written to the Command Processor T6 object.

Timer T61

Provides control of a timer.

Enable and configure as

required.

Serial Data Command T68

Provides an interface for the host driver to

deliver various data sets to the device.

Enable and configure as

required.

Dynamic Configuration

Controller T70

Allows rules to be defined that respond to

system events.

Enable and configure as

required.

Dynamic Configuration

Container T71

Allows the storage of user configuration on

the device that can be selected at runtime

based on rules defined in the Dynamic

Configuration Controller T70 object.

Configure if Dynamic

Configuration Controller T70 is

in use.

CTE Scan Configuration

T77

Configures enhanced X line scanning

features.

Enable and configure as

required.

Touch Event Trigger T79

Configures touch triggers for use with the

event handler.

Enable and configure as

required.

Auxiliary Touch

Configuration T104

Allows the setting of self capacitance gain

and thresholds for a particular measurement

to generate auxiliary touch data for use by

other objects.

Enable and configure if using

self capacitance

measurements

Self Capacitance Global

Configuration T109

Provides configuration for self capacitance

measurements employed on the device.

Check and configure as

required (if using self

capacitance measurements).

Self Capacitance Tuning

Parameters T110

Provides configuration space for a generic set

of settings for self capacitance

measurements.

Use under the guidance of

Microchip field engineers only.

Self Capacitance

Configuration T111

Provides configuration for self capacitance

measurements employed on the device.

Check and configure as

required (if using self

capacitance measurements).

Self Capacitance

Measurement Configuration

T113

Configures self capacitance measurements

to generate data for use by other objects.

Enable and configure as

required.

TABLE 12-1:

OBJECTS ON THE MXT1664T3 (CONTINUED)

Object

Description

Number of

Instances

Usage

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