Rainbow Electronics MAX5661 - Manual (Page 30)

MAX5661
Single 16-Bit DAC with Current and Voltage
Outputs for Industrial Analog Output Modules
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Output Configurations
The CNF0, CNF1, and OUTI4/0 hardware inputs deter-
mine whether the hardware or software controls the
MAX5661 DAC outputs (see Table 13). The CNF0 and
CNF1 inputs enable and disable the DAC outputs or
allow software control of the outputs (see Table 14).
The OUTI4/0 input sets the current range of the OUTI
output. Hardware inputs take precedence over the soft-
ware commands.
The V CC digital supply powers the CNF1, CNF0, and
OUTI4/0 inputs. If V CC = 0V, the DAC outputs enter the
zero state and all register bits are set to 0. The zero
state of the voltage output (OUTV) is 0V. The zero state
of the current output (OUTI) is 0mA when OUTI4/0 =
AGND or 4mA when OUTI4/0 = V
DDI
.
CONTROL
SIGNAL
HARDWARE
INPUT/SOFTWARE BIT
DESCRIPTION DETAILS
CNF1 Hardware input
CNF0 Hardware input
Enables/disables the DAC
OUTV and OUTI outputs.
CNF1, CNF0:
00 = both outputs disabled
01 = OUTI active, set to 0 to 20mA range
10 = OUTV active, set to bipolar mode
11 = outputs controlled by serial interface
OUTI4/0 Hardware input Sets the OUTI current range.
S et the OU TI4/0E N b i t to 0 ( d efaul t p ow er - up state) to enab l e
the O U TI4/0 har d w ar e i np ut. C onnect the OU TI4/0 har d w ar e
i np ut to AGN D to set the OU TI cur r ent r ang e to 0 to 20m A.
C onnect the O U TI4/0 har d w ar e i np ut to V
D D I to set the O U TI
cur r ent r ang e to 4–20m A. S et the OU TI4/0E N b i t to 1 to
d i sab l e the O U T14/0 har d w ar e i np ut. C onnect OU TI4/0 to
AGN D w hen contr ol l i ng the cur r ent outp ut thr oug h softw ar e.
OUTI4/0EN Software bit
Enables and disables the
OUTI4/0 input.
Set the OUTI4/0EN bit to 0 (default power-up state) to
enable the OUTI4/0 hardware input. Set to 1 to disable the
OUTI4/0 hardware input.
OUTVON Software bit
OUTION Software bit
Enables and disables the
DAC OUTV and OUTI
outputs.
When the CNF1 and CNF0 hardware inputs are high, the
OUTION and OUTVON bits control the DAC output OUTI
and OUTV settings.
OUTVON, OUTION:
00 = both outputs powered down
01 = OUTI active
10 = OUTV active
11 = both outputs powered down
B/U Software bit
Sets the voltage output to
unipolar mode or bipolar
mode.
Set B/U to 0 to set the OUTV output to bipolar mode
(±10.48V). Set B/U to 1 to set the OUTV output to unipolar
mode (0 to +10.48V).
I4TO20BIT Software bit
Sets the OUTI current range
through software.
Set I4TO20BIT to 0 to set the OUTI current range from 0 to
20mA. Set I4TO20BIT to 1 to set the OUTI current range
from 4–20mA.
Table 13. Output Configuration