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X9525B20I Datasheet(PDF) 6 Page - Intersil Corporation |
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X9525B20I Datasheet(HTML) 6 Page - Intersil Corporation |
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6 / 26 page  6 FN8210.0 March 10, 2005 Hot Pluggability Figure 7 shows a typical waveform that the X9525 might experience in a Hot Pluggable situation. On power-up, Vcc applied to the X9525 may exhibit some amount of ringing, before it settles to the required value. The device is designed such that the wiper terminal (RWx) is recalled to the correct position (as per the last stored in the DCP NVM), when the voltage applied to Vcc exceeds VTRIP for a time exceeding tpu. Therefore, if ttrans is defined as the time taken for Vcc to settle above VTRIP (Figure 7): then the desired wiper ter- minal position is recalled by (a maximum) time: ttrans + tpu. It should be noted that ttrans is determined by sys- tem hot plug conditions. DCP Operations In total there are three operations that can be performed on any internal DCP structure: —DCP Nonvolatile Write —DCP Volatile Write —DCP Read A nonvolatile write to a DCP will change the “wiper position” by simultaneously writing new data to the associated WCR and NVM. Therefore, the new “wiper position” setting is recalled into the WCR after Vcc of the X9525 is powered down and then powered back up. A volatile write operation to a DCP however, changes the “wiper position” by writing new data to the associated WCR only. The contents of the associated NVM register remains unchanged. Therefore, when Vcc to the device is powered down then back up, the “wiper position” reverts to that last position written to the DCP using a nonvolatile write operation. Both volatile and nonvolatile write operations are executed using a three byte command sequence: (DCP) Slave Address Byte, Instruction Byte, followed by a Data Byte (See Figure 9). A DCP Read operation allows the user to “read out” the current “wiper position” of the DCP, as stored in the associated WCR. This operation is executed using the Random Address Read command sequence, consisting of the (DCP) Slave Address Byte followed by an Instruction Byte and the Slave Address Byte again (Refer to Figure 10.). Instruction Byte While the Slave Address Byte is used to select the DCP devices, an Instruction Byte is used to determine which DCP is being addressed. The Instruction Byte (Figure 8) is valid only when the Device Type Identifier and the Internal Device Address bits of the Slave Address are set to 1010A011. In this case, the two Least Significant Bit’s (I1 - I0) of the Instruction Byte are used to select the particular DCP (0 - 2). In the case of a Write to any of the DCPs (i.e. the LSB of the Slave Address is 0), the Most Significant Bit of the Instruction Byte (I7), determines the Write Type (WT) performed. If WT is “1”, then a Nonvolatile Write to the DCP occurs. In this case, the “wiper position” of the DCP is changed by simultaneously writing new data to the associated WCR and NVM. Therefore, the new “wiper position” set- ting is recalled into the WCR after Vcc of the X9525 has been powered down then powered back up If WT is “0” then a DCP Volatile Write is performed. This operation changes the DCP “wiper position” by writing new data to the associated WCR only. The contents of Figure 7. DCP Power-up t Vcc VTRIP Vcc (Max.) tpu Maximum Wiper Recall time 0 ttrans X9525 |
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