Rainbow Electronics MAX5531 - Manual (Page 14)

MAX5530/MAX5531
Ultra-Low-Power, 12-Bit,
Voltage-Output DACs
14 ______________________________________________________________________________________
CONTROL BITS INPUT DATA
C3 C2 C1 C0 D11–D0
FUNCTION
0 0 0 0 XXXXXXXXXXXX No operation; command is ignored.
0 0 0 1 12-bit data
Load input register from shift register; DAC register unchanged;
DAC output unchanged.
0 0 1 0 — Command reserved; do not use.
0 0 1 1 — Command reserved; do not use.
0 1 0 0 — Command reserved; do not use.
0 1 0 1 — Command reserved; do not use.
0 1 1 0 — Command reserved; do not use.
0 1 1 1 — Command reserved; do not use.
1 0 0 0 12-bit data
Load DAC register from input register; DAC output updated;
MAX5530 enters normal operation if in shutdown; MAX5531 enters
normal operation if in standby or shutdown.
1 0 0 1 12-bit data
Load input register and DAC register from shift register; DAC output
updated; MAX5530 enters normal operation if in shutdown;
MAX5531 enters normal operation if in standby or shutdown.
1 0 1 0 — Command reserved; do not use.
1 0 1 1 — Command reserved; do not use.
1 1 0 0
D11, D10,
XXXXXXXXXX
MAX5530 enters shutdown; MAX5531 enters standby*. For the
MAX5531, D11 and D10 configure the internal reference voltage
(Table 3).
1 1 0 1
D11, D10,
XXXXXXXXXX
MAX5530/MAX5531 enter normal operation; DAC output reflects
existing contents of DAC register. For the MAX5531, D11 and D10
configure the internal reference voltage (Table 3).
1 1 1 0
D11, D10,
XXXXXXXXXX
MAX5530/MAX5531 enter shutdown; DAC output set to high
impedance. For the MAX5531, D11 and D10 configure the internal
reference voltage (Table 3).
1 1 1 1 12-bit data
Load input register and DAC register from shift register; DAC output
updated; MAX5530 enters normal operation if in shutdown;
MAX5531 enters normal operation if in standby or shutdown.
Table 2. Serial-Interface Programming Commands
X = Don’t care.
*Standby mode can be entered from normal operation only. It is not possible to enter standby mode from shutdown.