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X9420YVI-2.7 Datasheet(PDF) 4 Page - Xicor Inc. |
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X9420YVI-2.7 Datasheet(HTML) 4 Page - Xicor Inc. |
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4 / 20 page  X9420 Characteristics subject to change without notice. 4 of 20 REV 1.1.6 7/30/02 www.xicor.com Write in Process The contents of the Data Registers are saved to nonvolatile memory when the CS pin goes from LOW to HIGH after a complete write sequence is received by the device. The progress of this internal write operation can be monitored by a Write In Process bit (WIP). The WIP bit is read with a Read Status command. INSTRUCTIONS Address/Identification (ID) Byte The first byte sent to the X9420 from the host, following a CS going HIGH to LOW, is called the Address or Identification byte. The most significant four bits of the slave address are a device type identifier, for the X9420 this is fixed as 0101[B] (refer to Figure 2). The least significant bit in the ID byte selects one of two devices on the bus. The physical device address is defined by the state of the A0 input pin. The X9420 compares the serial data stream with the address input state; a successful compare of the address bit is required for the X9420 to successfully continue the command sequence. The A0 input can be actively driven by a CMOS input signal or tied to VCC or VSS. The remaining three bits in the ID byte must be set to 110. Figure 2. Address/Identification Byte Format Instruction Byte The next byte sent to the X9420 contains the instruction and register pointer information. The four most significant bits are the instruction. The next two bits point to one of four data registers. The format is shown below in Figure 3. Figure 3. Instruction Byte Format 1 00 11 0A0 Device Type Identifier Device Address 1 I1 I2 I3 I0 R1 R0 0 0 Register Select Instructions Figure 1. Detailed Potentiometer Block Diagram Serial Data Path From Interface Circuitry Register 0 Register 1 REGISTER 2 REGISTER 3 Serial Bus Input Parallel Bus Input Counter Register INC/DEC Logic UP/DN CLK Modified SCK UP/DN VH VL VW 8 6 C O U N T E R D E C O D E IF WCR = 00[H] THEN VW = VL IF WCR = 3F[H] THEN VW = VH Wiper (WCR) |
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