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ST72754 Datasheet(PDF) 97 Page - STMicroelectronics

No. de pieza ST72754
Descripción Electrónicos  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
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72754 Datasheet(HTML) 97 Page - STMicroelectronics

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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).



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