MTCH6301-ISLASHML datasheet(10/32 Pages) MICROCHIP

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MTCH6301 PROJECTED CAPACITIVE TOUCH CONTROLLER

DS41663A-page 10

 2012 Microchip Technology Inc.

5.0

COMMUNICATION PROTOCOL

5.1

Overview

The MTCH6301 has two basic communication types:

Touch & Gesture Protocol, and Command Protocol.

Touch & Gesture Protocol

Fully processed touch coordinates and gestures will be

transmitted immediately as they are processed by the

MTCH6301. Since it is a slave device, the INT pin will

be asserted whenever one of these packets is ready for

transmission. This requires the master controller to ini-

tiate a READ command to receive the touch or gesture

packet.

Command Protocol

All other commands are invoked by the I2C master

controller. Commands are used for configuring and

controlling the device.

Master Read Details

Please note that any read from the controller by the

master, including both touch & gesture protocol and

command protocol, will be prefixed by a single byte.

This single byte denotes the number of bytes that are

to be transferred. This byte is NOT represented in the

tables and figures for the protocol, but is detailed in

Figure 5-6 and Figure 5-7.

5.2

Touch Protocol

The packet in Table 5-1 is transmitted for each touch

that is present on the sensor.

5.3

Gesture Protocol

The packet in Table 5-2 is transmitted whenever a ges-

ture is performed on the sensor. This feature can be

enabled via the Gesture Protocol register (Table 5-2).

Gestures are NOT enabled by default.

TABLE 5-1:

TOUCH PROTOCOL

Packet

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

TOUCHID<3:0>

TCH(0)

PEN

X<6:0>

X<11:7>

Y<6:0>

Y<11:7>

Legend:

TOUCHID:

PEN:

TCH:

Touch ID (0-9)

Pen State

0 = Pen Up

1 = Pen Down

X Coordinate of Touch

Y Coordinate of Touch

Always 0, denotes a touch packet

Note:

For any “hold” gestures, packets are sent

continuously until the gesture (touch) is

released.

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