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EC24C128BR1GR Datasheet(PDF) 4 Page - E-CMOS Corporation |
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EC24C128BR1GR Datasheet(HTML) 4 Page - E-CMOS Corporation |
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4 / 17 page  EC24C128B 128K bits Two-wire Serial EEPROM E-CMOS Corp. (www.ecmos.com.tw) Page 4 of 17 5C27N-Rev.F001 Device Operation The EC24C128B serial interface supports communications using industrial standard 2-wire bus protocol, such as I 2C. 2-WIRE Bus The two-wire bus is defined as Serial Data (SDA), and Serial Clock (SCL). The protocol defines any device that sends data onto the SDA bus as a transmitter, and the receiving devices as receivers. The bus is controlled by Master device that generates the SCL, controls the bus access, and generates the Start and Stop conditions. The EC24C128B is the Slave device. The Bus Protocol Data transfer may be initiated only when the bus is not busy. During a data transfer, the SDA line must remain stable whenever the SCL line is high. Any changes in the SDA line while the SCL line is high will be interpreted as a Start or Stop condition. The state of the SDA line represents valid data after a Start condition. The SDA line must be stable for the duration of the High period of the clock signal. The data on the SDA line may be changed during the Low period of the clock signal. There is one clock pulse per bit of data. Each data transfer is initiated with a Start condition and terminated by a Stop condition. Start Condition The Start condition precedes all commands to the device and is defined as a High to Low transition of SDA when SCL is High. The EEPROM monitors the SDA and SCL lines and will not respond until the Start condition is met. Stop Condition The Stop condition is defined as a Low to High transition of SDA when SCL is High. All operations must end with a Stop condition. Acknowledge After a successful data transfer, each receiving device is required to generate an ACK. The Acknowledging device pulls down the SDA line. Reset The EC24C128B contains a reset function in case the 2- wire bus transmission on is accidentally interrupted (e.g. a power loss), or needs to be terminated mid-stream. The reset is initiated when the Master device creates a Start condition. To do this, it may be necessary for the Master device to monitor the SDA line while cycling the SCL up to nine times.(For each clock signal transition to High, the Master checks for a High level on SDA.) Standby Mode While in standby mode, the power consumption is minimal. The EC24C128B enters into standby mode during one of the following conditions: a) After Power-up, while no Op-code is sent; b) After the completion of an operation and followed by the Stop signal, provided that the previous operation is not Write related; or c) After the completion of any internal write operations. Device Addressing The Master begins a transmission on by sending a Start condition, then sends the address of the particular Slave devices to be communicated. The Slave device address is 8 bits format as shown in Figure. 5. The four most significant bits of the Slave address are fixed (1010) for EC24C128B. The next three bits, A0, A1 and A2, of the Slave address are specifically related to EEPROM. Up to eight EC24C128B units can be connected to the 2-wire bus. The last bit of the Slave address specifies whether a Read or Write operation is to be performed. When this bit is set to 1, Read operation is selected. While it is set to 0, Write operation is selected. After the Master transmits the Start condition and Slave address byte appropriately, the associated 2-wire Slave device,EC24C128B, will respond with ACK on the SDA line. Then EC24C128B will pull down the SDA on the ninth clock cycle, signaling that it received the eight bits of data. The EC24C128B then prepares for a Read or Write operation by monitoring the bus. |
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