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CAT5409YI-10-T2 Datasheet(PDF) 9 Page - ON Semiconductor |
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CAT5409YI-10-T2 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 15 page CAT5409 http://onsemi.com 9 INSTRUCTION AND REGISTER DESCRIPTION Slave Address Byte The first byte sent to the CAT5409 from the master/ processor is called the Slave Address Byte. The most significant four bits of the Device Type address are a device type identifier. These bits for the CAT5409 are fixed at 0101[B] (refer to Figure 8). The next four bits, A3 − A0, are the internal slave address and must match the physical device address which is defined by the state of the A3 − A0 input pins for the CAT5409 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 A3 − A0 inputs can be actively driven by CMOS input signals or tied to VCC or VSS. Instruction Byte The next byte sent to the CAT5409 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 Figure 9. Table 11. DATA REGISTER SELECTION Data Register Selected R1 R0 DR0 0 0 DR1 0 1 DR2 1 0 DR3 1 1 Figure 8. Identification Byte Format ID3 ID2 ID1 ID0 A3 A2 A1 A0 010 1 (MSB) (LSB) Device Type Identifier Slave Address Figure 9. Instruction Byte Format I3 I2 I1 I0 R1 R0 P1 P0 (MSB) (LSB) WCR/Pot Selection Instruction Opcode Data Register Selection WIPER CONTROL AND DATA REGISTERS Wiper Control Register (WCR) The CAT5409 contains four 6-bit Wiper Control Registers, one for each potentiometer. The Wiper Control Register output is decoded to select one of 64 switches along its resistor array. The contents of the WCR can be altered in four ways: it may be written by the host via Write Wiper Control Register instruction; it may be written by transferring the contents of one of four associated Data Registers via the XFR Data Register instruction, it can be modified one step at a time by the Increment/Decrement instruction (see Instruction section for more details). Finally, it is loaded with the content of its data register zero (DR0) upon power-up. The Wiper Control Register is a volatile register that loses its contents when the CAT5409 is powered-down. Although the register is automatically loaded with the value in DR0 upon power-up, this may be different from the value present at power-down. Data Registers (DR) Each potentiometer has four 6-bit non-volatile Data Registers. These can be read or written directly by the host. Data can also be transferred between any of the four Data Registers and the associated Wiper Control Register. Any data changes in one of the Data Registers is a non-volatile operation and will take a maximum of 5 ms. If the application does not require storage of multiple settings for the potentiometer, the Data Registers can be used as standard memory locations for system parameters or user preference data. Instructions Four of the nine instructions are three bytes in length. These instructions are: Read Wiper Control Register – read the current wiper position of the selected potentiometer in the WCR Write Wiper Control Register – change current wiper position in the WCR of the selected potentiometer |
Similar Part No. - CAT5409YI-10-T2 |
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Similar Description - CAT5409YI-10-T2 |
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