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DAC6574 Registers

DAC6574 as a Slave Receiver - Standard and Fast Mode

SLAVE ADDRESS R/W

A Ctrl-Byte

A MS-Byte A

LS-Byte

A/A

P

0 (write)

Data Transferred

(n* Words + Acknowledge)

Word = 16 Bit

From Master to DAC6574

From DAC6574 to Master

A = Acknowledge (SDA LOW)

A = Not Acknowledge (SDA HIGH)

S = START Condition

Sr = Repeated START Condition

P = STOP Condition

1

0

0

1

1

A1

A0

R/W

MSB

LSB

Factory Preset

S

0 = Write to DAC6574

1 = Read from DAC6574

DAC6574

SLAS408 – DECEMBER 2003

Table 3. DAC6574 Architecture Register Descriptions

REGISTER

DESCRIPTION

CTRL[7:0]

Stores 8-Bit wide control byte sent by the master

Stores the 8 most significant bits of unsigned binary data sent by the master. Can also store 2-bit power-down

MSB[7:0]

data.

LSB[7:0]

Stores the 2 least significant bits of unsigned binary data sent by the master (in LSB[7] and LSB[6]).

TRA[11:0], TRB[11:0],

12-bit temporary storage registers assigned to each channel. Two MSBs store power-down information, 10 LSBs

TRC[11:0], TRD[11:0]

store data.

DRA[11:0], DRB[11:0],

12-bit DAC registers for each channel. Two MSBs store power-down information, 10 LSBs store DAC data. An

DRC[11:0], DRD[11:0]

update of this register means a DAC update with data or power-down.

Figure 33 shows the standard and fast mode master transmitter addressing a DAC6574 Slave Receiver with a

7-bit address.

Figure 33. Standard and Fast Mode: Slave Receiver

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