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X9400YS24I-2.7 Datasheet(PDF) 5 Page - Intersil Corporation |
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X9400YS24I-2.7 Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 19 page  5 FN8189.3 July 28, 2006 Figure 1. Detailed Potentiometer Block Diagram 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 Identification (ID) Byte The first byte sent to the X9400 from the host, following a CS going HIGH to LOW, is called the Identification byte. The most significant four bits of the slave address are a device type identifier, for the X9400 this is fixed as 0101[B] (refer to Figure 2). 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 X9400 compares the serial data stream with the address input state; a successful compare of both address bits is required for the X9400 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 2. Identification Byte Format Instruction Byte The next byte sent to the X9400 contains the instruction and register pointer information. The four most significant bits are the instruction. The next four bits point to one of the four pots and, when applicable, they point to one of four associated registers. The format is shown below in Figure 3. Serial Data Path From Interface Circuitry Register 0 Register 1 Register 2 Register 3 Serial Bus Input Parallel Bus Input Wiper Counter Register INC/DEC Logic UP/DN CLK Modified SCL UP/DN VH/RH VL/RL VW/RW If WCR = 00[H] then VW/RW = VL/RL If WCR = 3F[H] then VW/RW = VH/RH 8 6 C o u n t e r D e c o d e (WCR) (One of Four Arrays) 1 00 0 0 A1 A0 Device Type Identifier Device Address 1 X9400 |
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