DAC7678SPW datasheet(30/52 Pages) TI

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DAC7678

SBAS493A – FEBRUARY 2010 – REVISED AUGUST 2010

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Broadcast Address Byte

2. Then send a command byte for the register to be

read. The device will acknowledge this event

Broadcast

addressing,

see

Table

15,

also

again.

supported by DAC7678. Broadcast addressing can

3. Then send a repeated start with the slave

be used for synchronously updating or powering

address and the R/W bit set to '1' for reading.

down

multiple

DAC7678

devices.

DAC7678

The device will also acknowledge this event.

designed

work

with

other

members

the

DACx578 family to support multichannel synchronous

4. Then the device writes the MSDB byte of the

update. Using the broadcast address, DAC7678

addressed

The

master

should

responds regardless of the states of the address pins.

acknowledge this byte. Finally, the device writes

Broadcast is supported only in write mode (Master

out the LSDB of the register as shown in

writes to DAC7678).

Table 16.

An alternative reading method allows for reading back

DAC7678 I

2C READ SEQUENCE

the value of the last register written. The sequence is

To read any register other than the power-down

a start/repeated start with slave address and the R/W

bit set to '1', and the two bytes of the last register are

used:

read out.

1. Send a start or repeated start command with a

Note that it is not possible to use the broadcast

slave address and the R/W bit set to '0' for

address for reading.

writing. The device will acknowledge this event.

Table 14. LSDB

MSB

LSB

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Least Significant Data Byte (LSDB)

Table 15. Broadcast Address Byte

MSB

LSB

Table 16. Read Sequence

MSB

…

R/W(0)

ACK

MSB

…

LSB

ACK

MSB

…

R/W(1)

ACK

MSB

…

LSB

ACK

MSB

…

LSB

ACK

Address Byte

Command/Access Byte

Address Byte

MSDB

LSDB

From master

Slave

From master

Slave

From master

slave

From Slave

Master

From Slave

Master

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