Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer ...

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AD5258I 2 C BYTE FORMATSThe following generic, write, read, and store/restore controlregisters for the AD5258 all refer to the device addresses listedin Table 5, and the mode/condition reference key (S, P, SA, MA,NA, W, R, and X) listed below.S = Start ConditionP = Stop ConditionSA = Slave AcknowledgeMA = Master AcknowledgeNA = No AcknowledgeTable 5. Device Address LookupAD1 and AD0 are three-state address pins.Device Address AD1 AD00011000 0 00011001 NC 00011010 1 00101001 0 NC0101010 NC NC0101011 1 NC1001100 0 11001101 NC 11001110 1 1W = WriteR = ReadX = Don’t CareGENERIC INTERFACETable 6. Generic Interface Format7-Bit Device AddressS (See Table 5) R/W SA C2 C1 C0 A4 A3 A2 A1 A0 SA D7 D6 D5 D4 D3 D2 D1 D0 SA PSlave Address Byte Instruction Byte Data ByteTable 7. RDAC-to-EEPROM Interface Command DescriptionsC2 C1 C0 Command Description0 0 0 Operation between I 2 C and RDAC0 0 1 Operation between I 2 C and EEPROM0 1 0 Operation between I 2 C and Write ProtectionRegister. See Table 10.1 0 0 NOP1 0 1 Restore EEPROM to RDAC1 1 0 Store RDAC to EEPROMRev. 0 | Page 16 of 24
AD5258WRITE MODESTable 8. Writing to RDAC RegisterS7-Bit Device Address(See Table 5) 0 SA 0 0 0 0 0 0 0 0 SA X X D5 D4 D3 D2 D1 D0 SA PSlave Address Byte Instruction Byte Data ByteTable 9. Writing to EEPROM RegisterS7-Bit Device Address(See Table 5) 0 SA 0 0 1 0 0 0 0 0 SA X X D5 D4 D3 D2 D1 D0 SA PSlave Address Byte Instruction Byte Data ByteThe wiper’s default value, prior to programming the EEPROM, is midscale.Table 10. Activating/Deactivating Software Write ProtectS7-Bit Device Address(See Table 5) 0 SA 0 1 0 0 0 0 0 0 SA 0 0 0 0 0 0 0 WP SA PSlave Address Byte Instruction Byte Data ByteIn order to activate the write protection mode, the WP bit in Table 10 must be logic high. In order to deactivate the write protection, thecommand must be sent again except with the WP in logic zero state.READ MODESRead modes are referred to as traditional because the first twobytes for all three cases are “dummy” bytes which function toplace the pointer towards the correct register. This is the reasonfor the repeat start. In theory, this step can be avoided if theuser is interested in reading a register that was previouslywritten to. For example, if the EEPROM was just written to,then the user can skip the two dummy bytes and proceeddirectly to the slave address byte followed by the EEPROMreadback data.Table 11. Traditional Readback of RDAC Register Value7-Bit Device AddressS (See Table 5) 0 SA 0 0 0 0 0 0 0 0 SA S7-Bit Device Address(See Table 5) 1 SA X X D5 D4 D3 D2 D1 D0 NA PSlave Address Byte Instruction Byte Slave Address Byte Read Back Data↑Repeat startTable 12. Traditional Readback of Stored EEPROM Value7-Bit Device AddressS (See Table 5) 0 SA 0 0 1 0 0 0 0 0 SA S7-Bit Device Address(See Table 5) 1 SA X X D5 D4 D3 D2 D1 D0 NA PSlave Address Byte Instruction Byte Slave Address Byte Read Back Data↑Repeat startSTORE/RESTORE MODESTable 13. Storing RDAC Value to EEPROM7-Bit Device AddressS (See Table 5) 0 SA 1 1 0 0 0 0 0 0 SA PSlave Address Byte Instruction ByteTable 14. Restoring EEPROM to RDAC7-Bit Device AddressS (See Table 5) 0 SA 1 0 1 0 0 0 0 0 SA PSlave Address Byte Instruction ByteRev. 0 | Page 17 of 24
Page 1: 查询 AD5258 供应商Nonvolati
Page 4 and 5: AD5258Parameter Symbol Conditions M
Page 6 and 7: AD5258ABSOLUTE MAXIMUM RATINGSTA =
Page 8 and 9: AD5258TYPICAL PERFORMANCE CHARACTER
Page 10 and 11: AD5258250120RHEOSTAT MODE TEMPCO (p
Page 12 and 13: AD52585V/DIV 2V/DIV12V WSCL200ns/DI
Page 14 and 15: AD5258THEORY OF OPERATIONThe AD5258
Page 18 and 19: AD5258TOLERANCE READBACK MODESTable
Page 20 and 21: AD5258DISPLAY APPLICATIONSCIRCUITRY
Page 22 and 23: AD5258NOTESRev. 0 | Page 22 of 24
Page 24: AD5258NOTES2 2Purchase of licensed

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