ST72T774J9B1 STMicroelectronics, ST72T774J9B1 Datasheet - Page 97

• Manufacturer Part Number: ST72T774J9B1
• Manufacturer: STMicroelectronics

Specifications of ST72T774J9B1

• Cpu Family: ST7
• Device Core Size: 8b
• Frequency (max): 24MHz
• Interface Type: I2C/USB
• Program Memory Type: EPROM
• Program Memory Size: 60KB
• Total Internal Ram Size: 1KB
• # I/os (max): 31
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4V
• On-chip Adc: 1-chx8-bit
• On-chip Dac: 1-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 42
• Package Type: SPDIP
• Lead Free Status / Rohs Status: Specific Sites Compliant

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 I
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.
2
C bidirectional
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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