Rainbow-electronics MAX5172 Manual do Utilizador descarregar pdf (Página 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

, then CLR resets the output volt-

age to midscale. In either case, CLR resets UPO to its

programmed default state.

SCLK

DIN

COMMAND

EXECUTED

C2 S0

D6 D3 D2 D1 D0 S2 S1D5 D4

Figure 4. Serial-Interface Timing Diagram

SCLK

DIN

DOUT

CSW

CS1

CSH

CSS

CSO

D02

D01

Figure 5. Detailed Serial-Interface Timing Diagram

1 2 ... 7 8 9 10 11 12 13 14 15 16

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Rainbow-electronics MAX5172 Manual do Utilizador Página 12