REF5050 datasheet(30/43 Pages) TI1

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(1)

SCLK

DIN

OPCODE 1

OPCODE 2

DOUT

REG DATA 1

REG DATA 2

Don’t Care

DAC1282

SBAS490

– DECEMBER 2011

www.ti.com

COMMANDS

The commands summarized in Table 14 control and configure the DAC1282. The register read and register write

commands are two-byte command arguments plus additional data bytes while the reset command is a one-byte

command. The DAC1282 serial port chip select (CS) can be taken high or held low between commands but must

remain low for the entire command operation.

Table 14. Command Definitions

COMMAND

TYPE

DESCRIPTION

FIRST OPCODE BYTE

SECOND OPCODE BYTE

RREG

Read nnnn register(s) at address rrrr(1)

0010 rrrr

0000 nnnn

WREG

Write nnnn register(s) at address rrrr

0100 rrrr

0000 nnnn

RESET

Control

Reset the device

0000 011x (06 or 07h)

(1)

rrrr = Starting read or write register address, nnnn= number of registers to read or write minus 1.

RREG: Read from Registers

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

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

the register address combined. The second byte of the command specifies the number of registers to read

(minus 1) in a block. Register data are output following the command input. Note that for multiple register read

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 read.

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

– 1.

Following bytes: Register data output in MSB-first format. The 16th SCLK falling edge of the opcode clocks out

the MSB of the register data.

(1) CS may be tied low.

Figure 48. RREG Command Example: Read Two Registers Starting from Register 00h

(OPCODE 1 = 0010 0000, OPCODE 2 = 0000 0001)

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