Datasheet

MTCH6301 PROJECTED CAPACITIVE TOUCH CONTROLLER

DS41663A-page 12  2012 Microchip Technology Inc.

5.5 Command Protocol

Figure 5-2 depicts bidirectional communication

protocol (for reading/writing configuration data).

FIGURE 5-2: COMMAND PROTOCOL

5.6 Full Command Set

A complete listing of MTCH6301 commands is shown

in Table 5 - 3. Any commands which contain data bytes,

either sent or received, are shown alongside an

example stream of data in the following sections.

5.6.1 WRITE REGISTER/READ

Writes or reads a single register. Note that all registers

are volatile, and any modified data will be lost on power

down. Registers must be saved to NVRAM to store the

configuration permanently

size: Number of remaining bytes in packet

cmd: Command invoked for being responded to

result: Controller command-specific result

0x00 = Success

0x80 = Parameter out of range

0xFE = Timeout (not enough bytes received)

0xFF = Unrecognized command

0xFD = Invalid parameter

0xFC = Missing or extra parameter

data: Data associated with command

0x55 [size] [cmd] Data 0 ... Data n

0x55 [size] [res] Data 0 ... Data n[cmd]

Command (from Master):

Response (from MTCH6301):

TABLE 5-3: COMMAND SET

ID Name Description

0x00 Enable Touch Enable touch functionality

0x01 Disable Touch Disable touch functionality

0x14 Scan Baseline Instruct controller to scan for a new sensor baseline

0x15 Write Register Write data to a specific register

0x16 Read Register Read data from a specific register

0x17 Write NVRAM Write all current register values to NVRAM

0x18 Software Sleep Instructs the controller to enter sleep mode

0x19 Erase NVRAM Erase the contents of the non-volatile RAM section.

0x1A Manufacturing Test Perform manufacturing tests on all sensor I/O channels