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CAT24AC128U14E-TE13 Datasheet(PDF) 4 Page - Catalyst Semiconductor |
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CAT24AC128U14E-TE13 Datasheet(HTML) 4 Page - Catalyst Semiconductor |
4 / 11 page CAT24AC128 4 Doc. No. 1028, Rev. I Figure 3. Start/Stop Timing Figure 2. Write Cycle Timing Figure 1. Bus Timing I2C BUS PROTOCOL The features of the I2C bus protocol are defined as follows: (1) Data transfer may be initiated only when the bus is not busy. (2) During a data transfer, the data line must remain stable whenever the clock line is high. Any changes in the data line while the clock line is high will be interpreted as a START or 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 CAT24AC128 monitors the SDA and SCL lines and will not respond until this condition is met. STOP Condition A LOW to HIGH transition of SDA when SCL is HIGH determines the STOP condition. All operations must end with a STOP condition. PIN DESCRIPTIONS SCL: Serial Clock The serial clock input clocks all data transferred into or out of the device. SDA: Serial Data/Address The bidirectional serial data/address pin is used to transfer all data into and out of the device. The SDA pin is an open drain output and can be wire-ORed with other open drain or open collector outputs. WP: Write Protect This input, when tied to GND, allows write operations to the entire memory. When this pin is tied to Vcc, the entire memory is write protected. When left floating, memory is unprotected. A0, A1, A2: Device Address Inputs These inputs set the device address when cascading multiple devices. When these pins are left floating the default values are zeroes. A maximum of eight devices can be cascaded. tHIGH SCL SDA IN SDA OUT tLOW tF tLOW tR tBUF tSU:STO tSU:DAT tHD:DAT tHD:STA tSU:STA tAA tDH tWR STOP CONDITION START CONDITION ADDRESS ACK 8TH BIT BYTE n SCL SDA START BIT SDA STOP BIT SCL |
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