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X9430WV24I Datasheet(PDF) 5 Page - Xicor Inc. |
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X9430WV24I Datasheet(HTML) 5 Page - Xicor Inc. |
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5 / 21 page  X9430 – Preliminary Information Characteristics subject to change without notice. 5 of 21 REV 1.0 6/20/00 www.xicor.com The two least significant bits in the ID byte select one of four devices on the bus. The physical device address is defined by the state of the A0-A1 input pins. The X9430 compares the serial data stream with the address input state; a successful compare of both address bits is required for the X9430 to successfully continue the command sequence. The A0–A1 inputs can be actively driven by CMOS input signals or tied to VCC or VSS. The remaining two bits in the slave byte must be set to 0. Figure 1. Identification Byte Format Instruction Byte The next byte sent to the X9430 contains the instruc- tion and register pointer information. The four most sig- nificant bits are the instruction. The next four bits point to one of the WCRs of the two pots, and when applica- ble, they point to one of four associated data registers. The format is shown below in Figure 2. Figure 2. Instruction Byte Format The four high order bits of the instruction byte specify the operation. The next two bits (R1 and R0) select one of the four registers that is to be acted upon when a register oriented instruction is issued. The last bit (P0) selects which one of the two potentiometers is to be affected by the instruction. Four of the ten instructions are two bytes in length and end with the transmission of the instruction byte. The basic sequence of the two byte instructions is illus- trated in Figure 3. These two-byte instructions exchange data between a wiper counter register and one of the four data registers associated with each. A transfer from a data register to a wiper counter register is essentially a write to a static RAM. The response of the wiper to this action will be delayed tWRL. A transfer from the wiper counter register (current wiper position) to a data register is a write to nonvolatile memory and takes a minimum of tWR to complete. The transfer can occur between one of the two potentiometers and one of its associated registers; or it may occur globally, wherein the transfer occurs between both of the poten- tiometers and one of their associated registers. Five instructions require a three-byte sequence to com- plete. These instructions transfer data between the host and the X9430; either between the host and one of the data registers or directly between the host and the Wiper Counter and Registers. These instructions are: 1) Read Wiper Counter Register, read the current wiper position of the selected pot 2) Write Wiper Counter Register, i.e. change current wiper position of the selected pot; 3) Read Data Register, read the con- tents of the selected nonvolatile register; 4) Write Data Register, write a new value to the selected data register; 5)Read Status, returns the contents of the WIP bit which indicates if an internal write cycle is in progress. The sequence of these operations is shown in Figure 4 and Figure 5. The final command is Increment/Decrement. It is differ- ent from the other commands, because it’s length is indeterminate. Once the command is issued, the mas- ter can clock the selected wiper up and/or down in one resistor segment steps; thereby, providing a fine tuning capability to the host. For each SCK clock pulse (tHIGH) while SI is HIGH, the selected wiper will move one resistor segment towards the VH terminal. Similarly, for each SCK clock pulse while SI is LOW, the selected wiper will move one resistor segment towards the VL terminal. A detailed illustration of the sequence and timing for this operation are shown in Figure 6 and Figure 7. 1 00 00 A1 A0 Device Type Identifier Device Address 1 I1 I2 I3 I0 R1 R0 0 P0 WCR Select Register Select Instructions |
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