 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
X9258TS24IZ Datasheet(PDF) 4 Page - Intersil Corporation |
|
||||||||||||||||||||||||||||||
X9258TS24IZ Datasheet(HTML) 4 Page - Intersil Corporation |
|
|
4 / 20 page  4 FN8168.5 April 14, 2011 initiate data transfers and provide the clock for both transmit and receive operations. Therefore, the X9258 will be considered a slave device in all applications. Clock and Data Conventions Data states on the SDA line can change only during SCL LOW periods (tLOW). SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. Start Condition All commands to the X9258 are preceded by the start condition, which is a HIGH to LOW transition of SDA while SCL is HIGH (tHIGH). The X9258 continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition is met. Stop Condition All communications must be terminated by a stop condition, which is a LOW to HIGH transition of SDA while SCL is HIGH. Acknowledge Acknowledge is a software convention used to provide a positive handshake between the master and slave devices on the bus to indicate the successful receipt of data. The transmitting device, either the master or the slave, will release the SDA bus after transmitting 8 bits. The master generates a ninth clock cycle and during this period the receiver pulls the SDA line LOW to acknowledge that it successfully received the 8 bits of data. The X9258 will respond with an acknowledge after recognition of a start condition and its slave address and once again after successful receipt of the command byte. If the command is followed by a data byte, the X9258 will respond with a final acknowledge. Array Description The X9258 is comprised of four resistor arrays. Each array contains 255 discrete resistive segments that are connected in series. The physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer (VH/RH and VL/RL inputs). At both ends of each array and between each resistor segment is a CMOS switch connected to the wiper (VW) output. Within each individual array only one switch may be turned on at a time. These switches are controlled by the Wiper Counter Register (WCR). The 8 bits of the WCR are decoded to select, and enable, one of 256 switches. The WCR may be written directly, or it can be changed by transferring the contents of one of four associated data registers into the WCR. These data registers and the WCR can be read and written by the host system. Device Addressing Following a start condition the master must output the address of the slave it is accessing. The most significant 4 bits of the slave address are the device type identifier (refer to Figure 1). For the X9258 this is fixed as 0101[B]. The next 4 bits of the slave address are the device address. The physical device address is defined by the state of the A0 thru A3 inputs. The X9258 compares the serial data stream with the address input state; a successful compare of all 4 address bits is required for the X9258 to respond with an acknowledge. The A0 thru A3 inputs can be actively driven by CMOS input signals or tied to VCC or VSS. Acknowledge Polling The disabling of the inputs (during the internal nonvolatile write operation), can be used to take advantage of the typical 5ms nonvolatile write cycle time. Once the stop condition is issued to indicate the end of the nonvolatile write command, the X9258 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the device slave address. If the X9258 is still busy with the write operation, no ACK will be returned. If the X9258 has completed the write operation an ACK will be returned and the master can then proceed with the next operation. 1 00 A3 A2 A1 A0 DEVICE TYPE IDENTIFIER DEVICE ADDRESS 1 FIGURE 1. SLAVE ADDRESS X9258 |
Similar Part No. - X9258TS24IZ |
|
Similar Description - X9258TS24IZ |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
