ST7571 Sitronix Technology, ST7571 Datasheet - Page 13

• Manufacturer Part Number: ST7571
• Description: 4 Gray Scale Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

www.DataSheet4U.com
ST7571
1.
2.
Ver 1.5a
DB[7:0]
Name
By connecting SDA_OUT to SDA_IN externally, the SDA line becomes fully I
acknowledge-output from serial data input is advantageous for chip-on-glass (COG) applications. In COG
applications, the ITO resistance and the pull-up resistor will form a voltage divider, which affects acknowledge-signal
level. Larger ITO resistance will raise the acknowledged-signal level and system cannot recognize this level as a valid
logic “0” level. By separating SDA_IN from SDA_OUT, the IC can be used in a mode that ignores the acknowledge-bit.
For applications which check acknowledge-bit, it is necessary to minimize the ITO resistance of the SDA_OUT trace
to guarantee a valid low level.
After VDD1 is turned ON, any MPU interface pins cannot be left floating.
I/O
I/O
I
I
When using parallel interface:
DB[7:0] are 8-bit data bus.
DB[7:0] are connected to the 8-bit data bus of a standard microprocessor.
When chip select is not active (CSB=H), DB[7:0] are high impedance.
When using 3-Line/4-Line serial interface:
DB7: serial input data (SID).
DB6: serial input clock (SCLK).
DB[5:0] are high impedance and must be fixed to “H”.
When chip select is not active (CSB=H), DB[7:0] are high impedance.
When using I
DB7: SCL, serial clock input.
DB[6:4]: SDA_IN, serial input data.
DB[3:2]: SDA_OUT, output the acknowledge signal of the I
DB[6:2] must be connected together (SDA).
DB[1:0]: SA[1:0], I
2
C interface:
2
C slave address bits of ST7571. Must connect to VDD1 or VSS1.
13/76
Description
*1
2
C interface protocol.
2
C interface compatible. Separating
2009/7/21