Rainbow Electronics MAX5159 - Manual (Page 10)

MAX5158/MAX5159
remains active. Data in the input registers is saved,
allowing the MAX5158/MAX5159 to recall the output
state prior to entering shutdown when returning to nor-
mal mode. Exit shutdown by recalling the previous con-
dition or by updating the DAC with new information.
When returning to normal operation (exiting shutdown),
wait 20µs for output stabilization.
Serial Interface
The MAX5158/MAX5159 3-wire serial interface is com-
patible with both Microwire (Figure 2) and SPI/QSPI
(Figure 3) serial-interface standards. The 16-bit serial
input word consists of an address bit, two control bits, 10
bits of data (MSB to LSB), and 3 sub-bits as shown in
Figure 4. The address and control bits determine the
MAX5158/MAX5159’s response, as outlined in Table 1.
Low-Power, Dual, 10-Bit Voltage-Output DACs
with Serial Interface
10 ______________________________________________________________________________________
FUNCTION
A0 C1 C0
D9..........................D0
(MSB) (LSB)
0 0 1 10-bit DAC data Load input register A; DAC registers are unchanged.
0 1 1 10-bit DAC data
Load all DAC registers from the shift register
(start up both DACs with new data.).
1 1 0 10-bit DAC data Load input register B; all DAC registers are updated.
0 1 0 10-bit DAC data Load input register A; all DAC registers are updated.
1 0 1 10-bit DAC data Load input register B; DAC registers are unchanged.
0 0 0 1 1 0 x xxxxxx Shut down DAC A (provided PDL = 1).
0 0 0 1 0 1 x xxxxxx
Update DAC register B from input register B
(start up DAC B with data previously stored in input register B).
0 0 0 0 0 1 x xxxxxx
Update DAC register A from input register A
(start up DAC A with data previously stored in input register A).
1 1 1 xxxxxxxxxx Shut down both DACs (provided PDL = 1).
1 0 0 xxxxxxxxxx
Update both DAC registers from their respective input registers
(start up both DACs with data previously stored in the input registers).
0 0 0 1 1 1 x xxxxxx Shut down DAC B (provided PDL = 1).
0 0 0 0 1 0 x xxxxxx UPO goes low (default).
0 0 0 0 1 1 x xxxxxx UPO goes high.
0 0 0 1 0 0 1 xxxxxx Mode 1, DOUT clocked out on SCLK’s rising edge.
0 0 0 1 0 0 0 xxxxxx Mode 0, DOUT clocked out on SCLK’s falling edge (default).
0 0 0 0 0 0 x xxxxxx No operation (NOP).
Table 1. Serial-Interface Programming Command
x = Don’t care
Note: When A0, C1, and C0 = 0, then D9, D8, D7, and D6 become control bits. S2–S0 are sub bits, always zero.
SCLK
DIN
CS
SK
SO
I/O
MAX5158
MAX5159
MICROWIRE
PORT
Figure 2. Connections for Microwire
16-BIT SERIAL WORD
S2–S0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0