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CAT5259 Datasheet(PDF) 7 Page - ON Semiconductor |
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CAT5259 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 15 page CAT5259 http://onsemi.com 7 Acknowledge After a successful data transfer, each receiving device is required to generate an acknowledge. The Acknowledging device pulls down the SDA line during the ninth clock cycle, signaling that it received the 8 bits of data. The CAT5259 responds with an acknowledge after receiving a START condition and its slave address. If the device has been selected along with a write operation, it responds with an acknowledge after receiving each 8-bit byte. When the CAT5259 is in a READ mode it transmits 8 bits of data, releases the SDA line, and monitors the line for an acknowledge. Once it receives this acknowledge, the CAT5259 will continue to transmit data. If no acknowledge is sent by the Master, the device terminates data transmission and waits for a STOP condition. WRITE OPERATIONS In the Write mode, the Master device sends the START condition and the slave address information to the Slave device. After the Slave generates an acknowledge, the Master sends the instruction byte that defines the requested operation of CAT5259. The instruction byte consist of a four-bit opcode followed by two register selection bits and two pot selection bits. After receiving another acknowledge from the Slave, the Master device transmits the data to be written into the selected register. The CAT5259 acknowledges once more and the Master generates the STOP condition, at which time if a non-volatile data register is being selected, the device begins an internal programming cycle to non-volatile memory. While this internal cycle is in progress, the device will not respond to any request from the Master device. Acknowledge Polling The disabling of the inputs can be used to take advantage of the typical write cycle time. Once the stop condition is issued to indicate the end of the host’s write operation, the CAT5259 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the slave address. If the CAT5259 is still busy with the write operation, no ACK will be returned. If the CAT5259 has completed the write operation, an ACK will be returned and the host can then proceed with the next instruction operation. Write Protection The Write Protection feature allows the user to protect against inadvertent programming of the non-volatile data registers. If the WP pin is tied to LOW, the data registers are protected and become read only. Similarly, the WP pin is going low after start will interrupt non-volatile write to data registers, while WP pin going low after an internal write cycle has started will have no effect on any write operation. The CAT5259 will accept both slave addresses and instructions, but the data registers are protected from programming by the device’s failure to send an acknowledge after data is received. STOP CONDITION START CONDITION ADDRESS ACK 8TH BIT BYTE n SCL SDA Figure 3. Write Cycle Timing Figure 4. Start/Stop Condition START CONDITION SDA STOP CONDITION SCL tWR |
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