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DAC7678SPW Datasheet(PDF) 29 Page - Texas Instruments |
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DAC7678SPW Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 52 page  DAC7678 www.ti.com SBAS493A – FEBRUARY 2010 – REVISED AUGUST 2010 Command and Access (CA) Byte Table 11. Command and Access Byte The Command and Access Byte, as shown in MSB LSB Table 11, controls which command is executed and C3 C2 C1 C0 A3 A2 A1 A0 which register is being accessed when writing to or Command bits Access bits reading from the DAC7678. See Table 12 for a list of write and read commands. Table 12. Command and Access Byte Format(1) C3 C2 C1 C0 A3 A2 A1 A0 DESCRIPTION Write Sequences 0 0 0 0 A3 A2 A1 A0 Write to DAC input register channel n 0 0 0 1 A3 A2 A1 A0 Select to update DAC register channel n Write to DAC input register channel n, and update all DAC registers (global 0 0 1 0 A3 A2 A1 A0 software LDAC) 0 0 1 1 A3 A2 A1 A0 Write to DAC input register channel n, and update DAC register channel n 0 1 0 0 X X X X Power down/on DAC 0 1 0 1 X X X X Write to clear code register 0 1 1 0 X X X X Write to LDAC register 0 1 1 1 X X X X Software reset 1 0 0 0 X X X X Write to internal reference register 1 0 0 1 X X X X Write to additional internal reference register Read Sequences 0 0 0 0 A3 A2 A1 A0 Read from DAC input register channel n 0 0 0 1 A3 A2 A1 A0 Read from DAC register channel n 0 1 0 0 X X X X Read from DAC power down register 0 1 0 1 X X X X Read from clear code register 0 1 1 0 X X X X Read from LDAC register 1 0 0 0 X X X X Read from internal reference register 1 0 0 1 X X X X Read from additional internal reference register Access Sequences C3 C2 C1 C0 0 0 0 0 DAC channel A C3 C2 C1 C0 0 0 0 1 DAC channel B C3 C2 C1 C0 0 0 1 0 DAC channel C C3 C2 C1 C0 0 0 1 1 DAC channel D C3 C2 C1 C0 0 1 0 0 DAC channel E C3 C2 C1 C0 0 1 0 1 DAC channel F C3 C2 C1 C0 0 1 1 0 DAC channel G C3 C2 C1 C0 0 1 1 1 DAC channel H C3 C2 C1 C0 1 1 1 1 All DAC channels, broadcast update (1) Any sequences other than the ones listed are invalid; improper use can cause incorrect device functionality. shown in Table 13 and Table 14. See Table 17 for a Most Significant Data Byte (MSDB) and Least complete list of write sequences and Table 18 for a Significant Data Byte (LSDB) complete list of read sequences. The DAC7678 updates at the falling edge of the acknowledge signal The MSDB and LSDB contain the data that are that follows the LSDB[0] bit. passed to the register(s) specified by the CA byte, as Table 13. MSDB MSB LSB DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 Most Significant Data Byte (MSDB) Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 29 Product Folder Link(s): DAC7678 |
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