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3-Wire Serial Interface
POWER-DOWN MODE
DAC7553
SLAS477 – SEPTEMBER 2005
TYPICAL CHARACTERISTICS (continued)
The DAC7553 digital interface is a standard 3-wire SPI/QSPI/Microwire/DSP-compatible interface.
Table 1. Serial Interface Programming
CONTROL DATA BITS DAC(s) FUNCTION
DB15 DB14 DB13 DB12 DB11-DB10
0 0 0 0 data A Single Channel Store. The TMP register of channel A is updated.
0 0 1 0 data B Single Channel Store. The TMP register of channel B is updated.
0 1 0 0 data A Single Channel Update. The TMP and DAC registers of channel A are
updated.
0 1 1 0 data B Single Channel Update. The TMP and DAC registers of channel A are
updated and the DAC register of channel B is updated with input register data.
1 0 0 0 data A Single Channel Update. The TMP and DAC registers of channel B are
updated.
1 0 1 0 data B Single Channel Update. The TMP and DAC registers of channel B are
updated and the DAC register of channel A is updated with input register data.
1 1 0 0 data A–B All Channel Update. The TMP and DAC registers of channels A and B are
updated.
1 1 1 0 data A–B All Channel DAC Update. The DAC register of channels A and B are updated
with input register data.
In power-down mode, the DAC outputs are programmed to one of three output impedances, 1 k Ω , 100 k Ω , or
floating.
Table 2. Power-Down Mode Control
EXTENDED CONTROL DATA BITS
FUNCTION
DB15 DB14 DB13 DB12 DB11 DB10 DB9-DB0
0 0 X 1 0 0 X PWD Hi-Z (all channels)
0 0 X 1 0 1 X PWD 1 k Ω (all channels)
0 0 X 1 1 0 X PWD 100 k Ω (all channels)
0 0 X 1 1 1 X PWD Hi-Z (all channels)
0 1 X 1 0 0 X PWD Hi-Z (selected channel = A)
0 1 X 1 0 1 X PWD 1 k Ω (selected channel = A)
0 1 X 1 1 0 X PWD 100 k Ω (selected channel = A)
0 1 X 1 1 1 X PWD Hi-Z (selected channel = A)
1 0 X 1 0 0 X PWD Hi-Z (selected channel = B)
1 0 X 1 0 1 X PWD 1 k Ω (selected channel = B)
1 0 X 1 1 0 X PWD 100 k Ω (selected channel = B)
1 0 X 1 1 1 X PWD Hi-Z (selected channel = B)
1 1 X 1 0 0 X PWD Hi-Z (all channels)
1 1 X 1 0 1 X PWD 1 k Ω (all channels)
1 1 X 1 1 0 X PWD 100 k Ω (all channels)
1 1 X 1 1 1 X PWD Hi-Z (all channels)
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