MXT1664T3-ABESSQTP datasheet(32/98 Pages) MICROCHIP

32 / 98 page

MXT1664T3 2.0

DS40002054A-page 32

 2018 Microchip Technology Inc.

7.0

HOST COMMUNICATIONS

Communication between the mXT1664T3 and the host is achieved using one of the following interfaces:

Any host interface can be used, depending on the needs of the user’s project, but only one interface can be used in any

one design.

7.1

Host Communication Mode Selection – COMMSEL Pin

The selection of the host I2C or USB interface is determined by connecting the COMMSEL pin according to Table 7-1.

7.2

I2C Mode Selection – I2CMODE Pin

The selection of the I2C or the HID-I2C mode is determined by connecting the I2CMODE pin according to Table 7-2.

7.2.1

AUTOMATIC SELECTION OF I2C AND HID-I2C MODES

If the I2CMODE pin is left floating (that is, automatic mode selection), the device will listen on both I2C addresses and

automatically select the protocol to be used depending on the first message received. In this case the ADDSEL pin

determines the primary and secondary I2C addresses, and these in turn determine the communications mode to be

used. If the primary I2C address is detected, I2C is used for communications; if the I2C secondary address is detected,

HID-I2C is used.

The selection of both the communications mode and the I2C addresses is summarized in Table 7-3.

•I2C (see Section 8.0 “I2C Communications”)

•HID-I2C (see Section 9.0 “HID-I2C Communications”)

• USB (see Section 10.0 “USB Communications”)

TABLE 7-1:

HOST INTERFACE SELECTION

COMMSEL

Interface Selected

Connected to GND

I2C

Pulled up to VddIO (1)

USB

Note

Requires a pull-up resistor; see Section 2.0 “Schematics”

NOTE

In USB mode, the I2CMODE pin is unused and should be connected to GND.

TABLE 7-2:

I2C MODE SELECTION

I2CMODE

Interface Selected

Connected to GND

HID-I2C

Pulled up to VddIO (1)

I2C

Floating

Mode is selected according to the I2C address (as

determined by the ADDSEL pin). See Section 7.2.1

“Automatic Selection of I2C and HID-I2C Modes” for more

information.

Note

Requires a pull-up resistor; see Section 2.0 “Schematics”

MXT1664T3-ABESSQTP Datasheet(PDF) 32 Page - Microchip Technology

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