Rainbow-electronics MAX5131 Manual de usuario descargar pdf (Pagina 11)

Power-Down Lockout Input (PDL)

The power-down lockout pin (PDL) disables shutdown

when low. When in shutdown mode, a high-to-low tran-

sition on PDL will wake up the DAC with its output still

set to the state prior to power-down. PDL can also be

used to wake up the device asynchronously.

Power-Down Input (PD)

Pulling PD high places the MAX5130/MAX5131 in shut-

down mode. Pulling PD low will not return the MAX5130/

MAX5131 to normal operation. A high-to-low transition

on PDL or appropriate commands (Table 1) via the ser-

ial interface are required to exit power-down.

Serial-Interface Configuration

(SPI/QSPI/MICROWIRE/PIC16/PIC17)

The MAX5130/MAX5131 3-wire serial interface is com-

patible with SPI, QSPI, PIC16/PIC17 (Figure 4) and

MICROWIRE (Figure 5) interface standards. The 2-byte-

long serial input word contains three control bits and 13

data bits in MSB-first format (Table 2).

The MAX5130/MAX5131’s digital inputs are double

buffered, which allows the user to:

• Load the input register without updating the DAC

• Update the DAC register with data from the input

• Update the input and DAC registers concurrently.

MAX5130/MAX5131

+3V/+5V, 13-Bit, Serial Voltage-Output DACs

with Internal Reference

______________________________________________________________________________________ 11

Load input register; DAC register unchanged.13-Bit DAC Data0 0

Update DAC register from input register; exit shutdown.XXXXXXXXXXXXX0 1

0 Simultaneously load input and DAC registers; exit shutdown.13-Bit DAC Data0

UPO goes low (default).XXXXXXXXXXXXX1 0

Mode 1; DOUT clocked out on SCLK’s rising edge.1XXXXXXXXXXXX1 1

0 UPO goes high.XXXXXXXXXXXXX1

No operation.XXXXXXXXXXXXX0

16-BIT SERIAL WORD

Shutdown DAC (provided PDL = 1).

XXXXXXXXXXXXX1

Mode 0; DOUT clocked out on SCLK’s falling edge (default).00XXXXXXXXXXX1 1 1

C1 C0C2

FUNCTION

D12 ............... D0

Table 1. Serial-Interface Programming Commands

X = Don’t care

DIN

SCLK

MOSI

SCK

I/O

SPI/QSPI

PORT

(PIC16/PIC17)

CPOL = 0, CPHA = 0

(CHE = 1, CKP = 0, SMP = 0,

SSPM3–SSPM0 = 0001)

( ): PIC16/PIC17 ONLY

MAX5130

MAX5131

Figure 4. SPI/QSPI Interface Connections (PIC16/PIC17)

DIN

SCLK

I/O

MICROWIRE

PORT

MAX5130

MAX5131

Figure 5. MICROWIRE Interface Connections

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

MAX5130/MAX5131 1

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Rainbow-electronics MAX5131 Manual de usuario Pagina 11

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