Rainbow-electronics MAX5842 User Manual download pdf (Page 13)

MAX5842

Quad, 12-Bit, Low-Power, 2-Wire, Serial

Voltage-Output DAC

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SERIAL DATA INPUT

C3 C2 C1 C0 D11 D10 D9 D8

FUNCTION

1110 X X X X

Update all DAC outputs simultaneously. Device ignores

D11-D8. Do not send the data byte.

1111 0 0 0 0

E xtend ed com m and m od e. The next w or d w r i tes to the p ow er -

d ow n r eg i ster s ( E xtend ed C om m and M od e) .

1111 0 0 0 1

Read DAC A data. The device expects an S

condition

followed by an address word with R/W = 1.

1111 0 0 1 0

Read DAC B data. The device expects an S

condition

followed by an address word with R/W = 1.

1111 0 1 0 0

Read DAC C data. The device expects an S

condition

followed by an address word with R/W = 1.

1111 1 0 0 0

Read DAC D data. The device expects an S

condition

followed by an address word with R/W = 1.

Table 3. Command Byte Definitions (continued)

SA6

A4 A3 A2 A1 A0 C3 C2

C0 D11 D10 D9 D8

Sr A6

A4 A3 A2 A1 A0

MSB LSB MSB LSB

LSBMSB

ACK

D7 D6 D5 D4 D3 D2 D1 D0

MSB LSB

ACK

ACK P

R/W

= 1

PD1

PD0 D11 D10 D9 D8

MSB LSB

DATA BYTES GENERATED BY MASTER DEVICE

DATA BYTES GENERATED BY MAX5842

ACK GENERATED BY

MASTER DEVICE

R/W

= 0

Figure 8. Example Read Word Data Sequence

1 2 ... 8 9 10 11 12 13 14 15

Voltage-Output DAC 1

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