Rainbow Electronics MAX5172 - Manual (Page 12)

MAX5170/MAX5172
Low-Power, Serial, 14-Bit DACs
with Voltage Output
12 ______________________________________________________________________________________
User-Programmable Logic Output (UPO)
The UPO allows control of an external device through
the serial interface, thereby reducing the number of
microcontroller I/O pins required. During power-down,
this output retains its digital state prior to shutdown.
When
CLR is pulled low, UPO resets to its programmed
default state. See Table 1 for specific commands to
control the UPO.
Reset (RS) and Clear (
CLR)
The MAX5170/MAX5172 offers a clear pin which resets
the output voltage. If RS = DGND, then
CLR resets the
output voltage to the minimum voltage (0 if OS =
AGND). If RS = V
DD , then CLR resets the output volt-
age to midscale. In either case, CLR resets UPO to its
programmed default state.
CS
SCLK
DIN
COMMAND
EXECUTED
9 8 16 1
C1 C2 S0 C0 D9 D8 D7 D6 D3 D2 D1 D0 S2 S1 D5 D4
Figure 4. Serial-Interface Timing Diagram
CS
SCLK
DIN
DOUT
t CSW
t CS1
t CSH
t CSS t CSO
t D02
t CH t CL
t CP
t D01
t DS t DH
Figure 5. Detailed Serial-Interface Timing Diagram