Electronic Components Datasheet Search |
|
CAT34AC02RA Datasheet(PDF) 5 Page - Catalyst Semiconductor |
|
CAT34AC02RA Datasheet(HTML) 5 Page - Catalyst Semiconductor |
5 / 10 page CAT34AC02 5 Doc No. 1025, Rev. E SERIAL BUS PROTOCOL The following defines the features of the ACR Serial bus protocol: (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 CAT34AC02 monitor 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. DEVICE ADDRESSING The Master begins a transmission by sending a START condition. The Master then sends the address of the particular slave device it is requesting. The four most significant bits of the 8-bit slave address are fixed as 1011 for the CAT34AC02 (see Fig. 5). The next three significant bits (A2, A1, A0) are the device address bits and define which device the Master is accessing. Up to eight CAT34AC02 may be individually addressed by the system. 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, a Read operation is selected, and when set to 0, a Write operation is selected. After the Master sends a START condition and the slave address byte, the CAT34AC02 monitors the bus and responds with an acknowledge (on the SDA line) when its address matches the transmitted slave address. The CAT34AC02 then performs a Read or a Write operation depending on the state of the R/ W bit. 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 CAT34AC02 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 byte. When the CAT34AC02 begins 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 CAT34AC02 will continue to transmit data. If no acknowledge is sent by the Master, the device terminates data transmission and waits for a STOP condition. Figure 4. Acknowledge Timing Figure 5. Slave Address Bits 1 DEVICE ADDRESS 0 1 1 A2 A1 A0 R/W ACKNOWLEDGE 1 START SCL FROM MASTER 89 DATA OUTPUT FROM TRANSMITTER DATA OUTPUT FROM RECEIVER |
Similar Part No. - CAT34AC02RA |
|
Similar Description - CAT34AC02RA |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |