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DAC0854 Folha de dados(PDF) 10 Page - National Semiconductor (TI) |
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DAC0854 Folha de dados(HTML) 10 Page - National Semiconductor (TI) |
10 / 14 page Digital Interface The DAC0854 has two interface modes a WRITE mode and a READ mode The WRITE mode is used to convert an 8-bit digital input word into a voltage The READ mode is used to read back the digital data that was sent to one or all of the DACs These modes are selected by the appropriate setting of the RDWR bit which is part of the instruction byte The instruction byte precedes the data byte at the DI pin In both modes a high level on the Start Bit (SB) alerts the DAC to respond to the remainder of the input stream Table I lists the instruction set for the WRITE mode when writing to only a single DAC and Table II lists the instruction set for a global write The DACs are always written to LSB first All DACs will be written to if the global bit (G) is high DAC 1 is written to first then DACs 2 3 and 4 (in that order) If the update bit is high then the DAC output will be updated on the rising edge of CS otherwise the new data byte will be placed only in the input register Chip Select (CS) must remain low for at least one clock cycle after the last data bit has been entered (See Figures 1 and 2 ) TABLE I WRITE Mode Instruction Set (Writing to a Single DAC) SB RDWR G U A1 A0 Description Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 1 0 0000 Write DAC 1 no update of DAC outputs 1 0 0001 Write DAC 2 no update of DAC outputs 1 0 0010 Write DAC 3 no update of DAC outputs 1 0 0011 Write DAC 4 no update of DAC outputs 1 0 0100 Write DAC 1 update DAC 1 on CS rising edge 1 0 0101 Write DAC 2 update DAC 2 on CS rising edge 1 0 0110 Write DAC 3 update DAC 3 on CS rising edge 1 0 0111 Write DAC 4 update DAC 4 on CS rising edge TABLE II WRITE Mode Instruction Set (Writing to all DACs) SB RDWR GU Description Bit 1 Bit 2 Bit 3 Bit 4 1 0 1 0 Write all DACs no update of outputs 1 0 1 1 Write all DACs update all outputs on CS rising edge 10 |
Nº de peça semelhante - DAC0854 |
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Descrição semelhante - DAC0854 |
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