MAX5302 Просмотр технического описания (PDF) - Maxim Integrated

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MAX5302

Low-Power, 12-Bit Voltage-Output DAC with Serial Interface

Maxim Integrated 

Low-Power, 12-Bit Voltage-Output DAC

with Serial Interface

SCLK

MAX5302 DIN

CS

SK

MICROWIRE

SO

PORT

I/O

Figure 2. Connections for MICROWIRE

+5V

DIN

MAX5302 SCLK

SS

MOSI

SCK

SPI/QSPI

PORT

CS

I/O

CPOL = 0, CPHA = 0

Figure 3. Connections for SPI/QSPI

by updating the DAC with new data. When powering up

the device or bringing it out of shutdown, allow 20µs for

the output to stabilize.

Serial-Interface Configurations

The MAX5302’s 3-wire serial interface is compatible

with both MICROWIRE (Figure 2) and SPI/QSPI (Figure 3).

The serial-input word consists of 3 control bits followed

by 12+1 data bits (MSB first), as shown in Figure 4. The

3-bit control code determines the MAX5302’s response

outlined in Table 1.

The MAX5302’s digital inputs are double buffered.

Depending on the command issued through the serial

interface, the input register can be loaded without

affecting the DAC register, the DAC register can be

loaded directly, or the DAC register can be updated

from the input register (Table 1).

Serial-Interface Description

The MAX5302 requires 16 bits of serial data. Table 1 lists

the serial-interface programming commands. For certain

commands, the 12+1 data bits are “don’t cares.” Data is

sent MSB first and can be sent in two 8-bit packets or

one 16-bit word (CS must remain low until 16 bits are

transferred). The serial data is composed of 3 control

MSB ..................................................................................LSB

16 Bits of Serial Data

Control

Bits

Data Bits

MSB ................................LSB Sub-Bit

C2 C1 C0 D11 .....................................D0, S0

3 Control

Bits

12+1 Data Bits

Figure 4. Serial-Data Format

Table 1. Serial-Interface Programming Commands

16-BIT SERIAL WORD

S0

C2 C1 C0

D11...............D0

MSB

LSB

S0

X0

0

X0

1

12 bits of data 0

12 bits of data 0

X1

0

XXXXXXXXXXXX X

1

1

1

0

1

1

X = Don’t care

XXXXXXXXXXXX X

XXXXXXXXXXXX X

FUNCTION

Load input register; DAC register immediately updated (also exit shutdown).

Load input register; DAC register unchanged.

Update DAC register from input register (also exit shutdown; recall previ-

ous state).

Shutdown

No operation (NOP)

_______________________________________________________________________________________ 7

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