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3-Wire Serial Interface

DAC7558

SLAS435A – MAY 2005 – REVISED DECEMBER 2005

The DAC7558 digital interface is a standard 3-wire SPI/QSPI/Microwire/DSP-compatible interface.

Table 1. Serial Interface Programming

DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15–DB4 DB3–DB0

DESCRIPTION

A1 A0 LD1 LD0 SEL2 SEL1 SEL0 PWD MSB–LSB Don't Care

0 0 0 0 0 0 0 0 Data X Write to buffer A with data

0 0 0 0 1 0 Data X Write to buffer B with data

0 0 0 1 0 0 Data X Write to buffer C with data

0 0 0 1 1 0 Data X Write to buffer D with data

0 0 1 0 0 0 Data X Write to buffer E with data

0 0 1 0 1 0 Data X Write to buffer F with data

0 0 1 1 0 0 Data X Write to buffer G with data

0 0 1 1 1 0 Data X Write to buffer H with data

0 1 (000, 001, 010, 011, 0 Data X Write to buffer with data and load DAC

100, 101, 110, 111) (selected by DB19, DB18, and DB17)

1 0 (000, 001, 010, 011, 0 Data X Write to buffer with data and load DAC

100, 101, 110, 111) (selected by DB19, DB18, and DB17) and

load all other DACs with buffer data

1 1 0 0 0 0 Data X Load DACs A and B with current buffer

data

(Both A1 and

1 1 0 0 1 0 Data X Load DACs A, B, C, and D with current

A0 should be

buffer data

set to zero for

normal device

1 1 0 1 0 0 Data X Load DACs A, B, C, D, E, and F with

operation.

current buffer data

DAC(s) do not

1 1 0 1 1 0 Data X Load DACs A, B, C, D, E, F, G, and H

respond if any

with current buffer data

other

combination is

1 1 1 0 0 0 Data X Write to buffer with new data and load

used)

DACs A and B simultaneously

1 1 1 0 1 0 Data X Write to buffer with new data and load

DACs A, B, C, and D simultaneously

1 1 1 1 0 0 Data X Write to buffer with new data and load

DACs A, B, C, D, E, and F simultaneously

1 1 1 1 1 0 Data X Write to buffer with new data and load

DACs A, B, C, D, E, F, G, and H

simultaneously

Write to buffer and load DAC with

(000, 001, 010, 011, Power-Down command to individual

X 0 1 See Table 2 X

100, 101, 110, 111) channel (selected by DB19, DB18, and

DB17)

X Write to buffer and load DACs with

(000, 001, 010, 011, See Table 2 Power-Down command to multiple

X 1 1

100, 101, 110, 111) and Table 3 channels (selected by DB19, DB18, and

DB17)