ATMXT448UD-CCUBHA1 datasheet(30/76 Pages) MICROCHIP

Part #	ATMXT448UD-CCUBHA1

Description	maXTouch 448-node Touchscreen Controller

PDF	76 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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30 / 76 page

mXT448UD-CCUBHA1 1.0

DS40002352A-page 30

 2021 Microchip Technology Inc. and its subsidiaries

8.5

SDA and SCL

The I2C bus transmits data and clock with SDA and SCL, respectively. These are open-drain. The device can only drive

these lines low or leave them open. The termination resistors (Rp) pull the line up to VddIO if no I2C device is pulling it

down.

The termination resistors should be chosen so that the rise times on SDA and SCL meet the I2C specifications for the

interface speed being used, bearing in mind other loads on the bus. For best latency performance, it is recommended

that no other devices share the I2C bus with the maXTouch controller.

8.6

Clock Stretching

The device supports clock stretching in accordance with the I2C specification. It may also instigate a clock stretch if a

communications event happens during a period when the device is busy internally. The maximum clock stretch is 2 ms

and typically less than 350 µs.

ATMXT448UD-CCUBHA1 Datasheet(PDF) 30 Page - Microchip Technology