MXT1664T3-ABESSQTP datasheet(41/98 Pages) MICROCHIP

41 / 98 page

MXT1664T3 2.0

 2018 Microchip Technology Inc.

DS40002054A-page 41

9.5

Generic HID-I2C TLC

The Generic HID-I2C TLC supports an input report for receiving data from the device and an output report for sending

data to the device.

Commands are sent by the host using the output reports. Responses from the device are sent using input reports.

Supported commands are:

• Read/Write Memory Map

• Send Auto-return Messages

The HID-I2C report ID used is that for Object Protocol commands and responses; see Table 9-2 on page 40 for the

value.

9.5.1

READ/WRITE MEMORY MAP COMMAND

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

The data packet for a read/write command consists of 18 bytes, made up of a 1-byte HID-I2C report ID followed by 17

bytes of data (see Figure 9-1).

FIGURE 9-1:

READ/WRITE MEMORY MAP – GENERIC PACKET FORMAT

9.5.1.1

Command and Response Packets

The command packet has the generic format given in Figure 9-2. The following sections give examples on using the

command to write to the memory map and to read from the memory map.

FIGURE 9-2:

READ/WRITE MEMORY MAP – COMMAND PACKET FORMAT

In Figure 9-2:

• Rpt ID is the HID-I2C report ID used for Object Protocol commands and responses (see Table 9-2 on page 40).

• Command ID is the command ID for the write/read operation (0x51)

• NumWx is the number of data bytes to write to the memory map (may be zero). If the address pointer is being

sent, this must include the size of the address pointer.

• NumRx is the number of data bytes to read from the memory map (may be zero).

• Addr 0 and Addr 1 form the address pointer to the memory map (where necessary; may be zero if not needed).

This is typically an address of an object within the device.

• Data 0 to Data 11 are the bytes of data to be written (in the case of a write). Note that data locations beyond the

number specified by NumWx will be ignored.

The response packet has the generic format given in Figure 9-3.

0x05

Touch Hardware Quality Assurance (THQA) report

(see Section 9.6.4 “Touch Hardware Quality Assurance

(THQA) Report”)

Digitizer HID-I2C

TABLE 9-2:

HID-I2C REPORT IDS (CONTINUED)

Report ID

Description

Top-level Collection

Data 16

Data 0

...

Report ID

Packet Data

(17 Bytes)

Rpt ID

Write Data

Data 11

Data 0

...

0x51

NumWx

Address Pointer

(LSByte, MSByte)

Number of Bytes

to Read/Write

NumRx

Addr 0

Addr 1

Rpt ID

Command

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