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SMS2904S Datasheet(PDF) 7 Page - Summit Microelectronics, Inc. |
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SMS2904S Datasheet(HTML) 7 Page - Summit Microelectronics, Inc. |
7 / 14 page SMS2902/SMS2904/SMS2916 7 2028 5.1 8/2/00 FIGURE 5. ACKNOWLEDGE RESPONSE FROM RECEIVER CHARACTERISTICS OF THE I2C BUS General Description The I2C bus was designed for two-way, two-line serial communication between different integrated circuits. The two lines are: a serial data line (SDA), and a serial clock line (SCL). The SDA line must be connected to a positive supply by a pull-up resistor, located somewhere on the bus (See Figure 1). Data transfer between devices may be initiated with a START condition only when SCL and SDA are HIGH (bus is not busy). Input Data Protocol One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during clock HIGH time, because changes on the data line while SCL is HIGH will be interpreted as start or stop condition. START and STOP Conditions When both the data and clock lines are HIGH, the bus is said to be not busy. A HIGH-to-LOW transition on the data line, while the clock is HIGH, is defined as the “START” condition. A LOW-to-HIGH transition on the data line, while the clock is HIGH, is defined as the “STOP” condi- tion . DEVICE OPERATION The SMS29xx is a 2K/4K/16K serial E2PROM. The de- vice supports the I2C bidirectional data transmission protocol. The protocol defines any device that sends data onto the bus as a “transmitter” and any device which receives data as a “receiver.” The device controlling data transmission is called the “master” and the controlled device is called the “slave.” In all cases, the SMS29xx will be a “slave” device, since it never initiates any data transfers. FIGURE 6. SLAVE ADDRESS BYTE Acknowledge (ACK) Acknowledge is a software convention used to indicate successful data transfers. The transmitting device, either the master or the slave, will release the bus after transmit- ting eight bits. During the ninth clock cycle, the receiver will pull the SDA line LOW to ACKnowledge that it re- ceived the eight bits of data (See Figure 5). The SMS29xx will respond with an ACKnowledge after recognition of a START condition and its slave address byte. If both the device and a write operation are selected, the SMS29xx will respond with an ACKnowledge after the receipt of each subsequent 8-bit word. In the READ mode, the SMS29xx transmits eight bits of data, then releases the SDA line, and monitors the line for an ACKnowledge signal. If an ACKnowledge is detected, and no STOP condition is generated by the master, the SMS29xx will continue to transmit data. If an ACKnowledge is not detected, the SMS29xx will terminate further data transmissions and awaits a STOP condition before returning to the standby power mode. Device Addressing Following a start condition the master must output the address of the slave it is accessing. The most significant four bits of the slave address are the device type identifier (‘1010’) (see figure 6). SCL from Master Data Output from Transmitter Data Output from Receiver Start Condition ACKnowledge tAA tAA 1 8 9 2028 ILL7.0 1 0 1 0 R/W DEVICE IDENTIFIER 2028 ILL8.1 A 10 * A 8 ** A 9 * * = 2916 only ** = 2904 only |
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