REF5050 datasheet(31/43 Pages) TI1

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(1)

SCLK

DIN

OPCODE 1

OPCODE 2

REG DATA 1

REG DATA 2

DOUT

Don’t Care

DAC1282

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SBAS490

– DECEMBER 2011

WREG: Write to Registers

Description: These two opcode bytes write register data. The register write operation is a two-byte opcode

followed by one or more bytes of register data. The first byte of the command is the write opcode and the register

address combined. The second byte of the command specifies the number of registers to write (minus 1) in a

single sequence. The following bytes are the register data bytes. Note that for multiple register write operations,

the register address pointer does not wrap when the last register is exceeded.

First opcode byte: 0010 rrrr, where rrrr is the starting address register address to be written.

Second opcode byte: 0000 nnnn, where nnnn is the number of registers to write

– 1.

Following bytes: Register data input in MSB-first format.

(1) CS may be tied low.

Figure 49. WREG Command Example: Write Two Registers Starting from Register 00h

(OPCODE 1 = 0100 0000, OPCODE 2 = 0000 0001)

RESET: Device Reset

Description: This command resets the DAC. The registers are set to power-on default the value; see the

RESET/PWDN section.

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