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CAT5401WI-25 Datasheet(PDF) 7 Page - ON Semiconductor |
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CAT5401WI-25 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 15 page CAT5401 © 2008 SCILLC. All rights reserved. 7 Doc. No. MD-2012 Rev. I Characteristics subject to change without notice INSTRUCTION AND REGISTER DESCRIPTION DEVICE TYPE / ADDRESS BYTE The first byte sent to the CAT5401 from the master/ processor is called the Device Address Byte. The most significant four bits of the Device Type address are a device type identifier. These bits for the CAT5401 are fixed at 0101[B] (refer to Table 1). The two least significant bits in the slave address byte, A1 - A0, are the internal slave address and must match the physical device address which is defined by the state of the A1 - A0 input pins for the CAT5401 to successfully continue the command sequence. Only the device which slave address matches the incoming device address sent by the master executes the instruction. The A1 - A0 inputs can be actively driven by CMOS input signals or tied to VCC or VSS. The remaining two bits in the device address byte must be set to 0. INSTRUCTION BYTE The next byte sent to the CAT5401 contains the instruction and register pointer information. The four most significant bits used provide the instruction opcode I [3:0]. The R1 and R0 bits point to one of the four data registers of each associated potentiometer. The least two significant bits point to one of four Wiper Control Registers. The format is shown in Table 2. Data Register Selection Data Register Selected R1 R0 DR0 0 0 DR1 0 1 DR2 1 0 DR3 1 1 Table 1. Identification Byte Format Table 2. Instruction Byte Format ID3 ID2 ID1 ID0 0 0 A1 A0 0101 (MSB) (LSB) Device Type Identifier Slave Address I3 I2 I1 I0 R1 R0 P1 P0 (MSB) (LSB) WCR/Pot Selection Instruction Opcode Data Register Selection |
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