DAC1282 Datasheet, PDF (30/43 Pages) Texas Instruments – LOW DISTORTION DIGITAL-TO-ANALOG CONVERTER FOR SEISMIC

DAC1282
SBAS490 – DECEMBER 2011
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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
RREG
WREG
RESET
TYPE
Register
Register
Control
DESCRIPTION
Read nnnn register(s) at address rrrr⁽¹⁾
Write nnnn register(s) at address rrrr
Reset the device
FIRST OPCODE BYTE
0010 rrrr
0100 rrrr
0000 011x (06 or 07h)
SECOND OPCODE BYTE
0000 nnnn
0000 nnnn
(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.
CS ⁽¹⁾
1
9
17
25
SCLK
DIN
OPCODE 1
OPCODE 2
DOUT
Don’t Care
REG DATA 1
REG DATA 2
(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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