ST72754 datasheet(97/144 Pages) STMICROELECTRONICS

Part #	ST72754

Description	8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C

PDF	144 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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97 / 144 page

ST72774/ST727754/ST72734

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DDC INTERFACE (Cont’d)

4.8.3 Signal Description

Serial Data (SDA)

The SDA bidirectional pin is used to transfer data

in and out of the device. It is an open-drain output

that may be or-wired with other open-drain or

open-collector pins. An external pull-up resistor

must be connected to the SDA line. Its value

depends on the load of the line and the transfer

rate.

Serial Clock (SCL)

The SCL input pin is used to synchronize all data in

and out of the device when in I2C bidirectional

mode. An external pull-up resistor must be

connected to the SCL line. Its value depends on

the load of the line and the transfer rate.

Note:When the DDC1/2B and DDC/CI-Factory Interfaces

are disabled (HWPE bit=0 in the DCR register and

PE bit=0 in the CR register), SDA and SCL pins re-

vert to standard I/O pins.

Transmit-only Clock (Vsync/Vsync2)

The Vsync input pins are used to synchronize all

data in and out of the device when in Transmit-only

mode.

These pins are ONLY used by the DDC1/2B

interface (when in DDC1 mode).

ST72754 Datasheet(PDF) 97 Page - STMicroelectronics