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SDA5649 Datasheet(PDF) 6 Page - Siemens Semiconductor Group |
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SDA5649 Datasheet(HTML) 6 Page - Siemens Semiconductor Group |
6 / 26 page SDA 5649 SDA 5649X Semiconductor Group 49 I2C-Bus General Information The I2C-Bus interface implemented on the PDC decoder is a slave transmitter/receiver, i.e., both reading from and writing to the PDC / VPS decoder is possible. The clock line SCL is controlled only by the bus master usually being a micro controller, whereas the SDA line is controlled either by the master or by the slave. A data transfer can only be initiated by the bus master when the bus is free, i.e., both SDA and SCL lines are in a high state. As a general rule for the I2C-Bus, the SDA line changes state only when the SCL line is low. The only exception to that rule are the Start Condition and the Stop Condition. Further Details are given below. The following abbreviations are used: START : Start Condition generated by master AS : Ackknowledge by slave AM : Ackknowledge by master NAM : No Ackknowledge by master STOP : Stop Condition generated by master Chip Address There are two pairs of chip addresses, which are selected by the CS0-input pin according to the following table: Write Mode For writing to the PDC decoder, the following format has to be used. Data Transfer (Write Mode) Step1: In order to start a data transfer the master generates a Start Condition on the bus by pulling the SDA line low while the SCL line is held high. Step 2: The bus master puts the chip address on the SDA line during the next eight SCL pulses. Step 3: The master releases the SDA line during the ninth clock pulse. Thus the slave can generate an acknowledge (AS) by pulling the SDA line to a low level. Step 4: The controller transmits the data byte to set the Control register. Step 5: The slave acknowledges the reception of the byte. Step 6: The master concludes the data communication by generating a Stop Condition. The write mode is used to set the I2C-Bus control register which determines the operating mode: CS0 Input Write Mode Read Mode Low 20 (hex) 21 (hex) High 22 (hex) 23 (hex) START Chipadress Write Mode AS Byte Set Control Register AS STOP |
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