Rainbow-electronics MAX5121 Bedienungsanleitung PDF herunterladen (Seite 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 MAX5120/MAX5121 in shut-

down mode. Pulling PD low will not return the MAX5120/

MAX5121 to normal operation. A high-to-low transition

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

al interface are required to exit power-down.

Serial-Interface Configuration

(SPI/QSPI/MICROWIRE/PIC16/PIC17)

The MAX5120/MAX5121 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, 12 data

bits in MSB-first format and one sub-bit, which is always

zero (Table 2).

The MAX5120/MAX5121’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.

MAX5120/MAX5121

+3V/+5V, 12-Bit, Serial Voltage-Output DACs

with Internal Reference

______________________________________________________________________________________ 11

Load input register; DAC register unchanged.12-Bit DAC Data0 0

Update DAC register from input register; exit shutdown.XXXXXXXXXXXX0 1

0 Simultaneously load input and DAC registers; exit shutdown.12-Bit DAC Data0

UPO goes low (default).XXXXXXXXXXXX1 0

Mode 1; DOUT clocked out on SCLK’s rising edge.1XXXXXXXXXXX1 1

0 UPO goes high.XXXXXXXXXXXX1

No operation.XXXXXXXXXXXX0

16-BIT SERIAL WORD

Shutdown DAC (provided PDL = 1)

XXXXXXXXXXXX1

Mode 0; DOUT clocked out on SCLK’s falling edge (default).00XXXXXXXXXX1 1 1

C1 C0C2

FUNCTION

Table 1. Serial-Interface Programming Commands

= Don’t care

S0 is a sub-bit and is always zero.

DIN

SCLK

MOSI

SCK

I/O

SPI/QSPI

PORT

(PIC16/PIC17)

CPOL = 0, CPHA = 0

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

SSPM3–SSPMO = 0001

( ): PIC16/PIC17 ONLY

MAX5120

MAX5121

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

DIN

SCLK

I/O

MICROWIRE

PORT

MAX5120

MAX5121

Figure 5. MICROWIRE Interface Connections

D11 ............... D0 S0*

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

MAX5120/MAX5121 1

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