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ST7585 Datasheet(PDF) 9 Page - Sitronix Technology Co., Ltd. |
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ST7585 Datasheet(HTML) 9 Page - Sitronix Technology Co., Ltd. |
9 / 51 page ST7585 Ver 1.0c 9/51 2009/04/14 Pin Name Type Description No. of Pins ERD I Read/Write execution control pin. When parallel interface is selected: MPU Type ERD Description 6800 series E Read/Write control input pin. R/W= ”H“: When E is “H”, D[7:0] are in an output status. R/W= ”L“: Signals on D[7:0] are latched at the falling edge of E signal. 8080 series /RD Read enable input pin. When /RD is “L”, D[7:0] are in output status. ERD is not used in serial interfaces and should fix to “H” by VDD1. 1 I/O When using 8-bit parallel interface: 6800 or 8080 mode 8-bit bi-directional data bus. Connect to the data bus of 8-bit microprocessor. When CSB is non-active (CSB= “H”), D[7:0] pins are high impedance. I When using serial interface: 4-LINE or 3-LINE D7=SCLK : Serial clock input. D6=SDA : Serial data input. D5=A0 : Command / Data selection (unused in 3-Line SPI; fix to H by VDD1). D4=CSB : Chip select pin. D[3:0] : Not used and should fix to “H” by VDD1. D[7:0] I, O When using I 2C interface D7=SCLK : Serial clock input. D6=SDA_IN *1 : Serial data input. D[5:3] : SDA_OUT *1 : Outputs for acknowledge-bit of the I2C protocol. D[2]= Not used and should fix to “H” by VDD1. D[1:0]=SA[1:0] : Slave address bits. Must set to “H” by VDD1 or “L” by VSS1. D[6:3] must connect together (SDA). *1 CSB is not used in I 2C interface and should fix to “H” by VDD1. 8 Note: 1. By connecting SDA_IN and SDA_OUT externally, the SDA line becomes fully I 2C interface compatible. Separating 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 acknowledge-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 which 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. 2. After VDD1 is turned ON, any MPU interface pins cannot be left floating. |
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