DAC7678SPW datasheet(37/52 Pages) TI

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DAC7678

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SBAS493A – FEBRUARY 2010 – REVISED AUGUST 2010

OPERATING EXAMPLES: DAC7678

For the following examples X = don’t care; value can be either '0' or '1'.

I2C Standard and Fast mode examples (ADDR0 and LDAC pin tied low) (TSSOP package)

Example 1: Write Mid Scale to Data Buffer A and Update Channel A Output

Command and

Start

Address

MSDB

LSDB

Stop

Access Byte

ACK

1001 0000

0000 0000

1000 0000

0000 XXXX

Channel A updates to Mid Scale after the falling edge of the last ACK cycle

SPACER

Example 2: Power-Down Channel B, C, and H with Hi-Z Output

Command and

Start

Address

MSDB

LSDB

Stop

Access Byte

ACK

1001 0000

0100 XXXX

X111 0000

110X XXXX

SPACER

Example 3: Read-back the value of the input register of Channel G

Command and

Repeated

MSDB (from

LSDB (from

Start

Address

Access Byte

Start

DAC7678)

ACK

1001 0000

0000 0110

1001 0001

XXXX XXXX

XXXX 0000

SPACER

Example 4: Write multiple bytes of data to Channel F

Write Full Scale and then Quarter Scale to Channel F

Command and

Start

Address

MSDB

LSDB

MSDB

LSDB

Stop

Access Byte

ACK

ACK*

ACK

ACK**

1001 0000

0000 0101

1111 1111

1111 XXXX

0100 0000

0000 XXXX

Channel F updates to Full Scale after the falling edge of the 4th ACK* cycle and then Channel F updates to

quarter scale after falling edge of the last ACK** cycle.

I2C High Speed mode example (ADDR0 and LDAC pin tied low) (TSSOP package)

SPACER

Example 5: Write Mid Scale and then Full Scale to all DAC channels

Command

NOT

Repeated

Start

Master

Address

ACK

and Access

ACK

MSDB

ACK

LSDB

ACK

MSDB

ACK

LSDB

ACK

Stop

ACK

Start

Code

Byte

0000 1000

1001 0000

0011 1111

1000 0000

0000 XXXX

1111 1111

1111 XXXX

All Channels update to Mid Scale after the falling edge of the 4th ACK cycle and then all Channels update to Full

scale after falling edge of the last ACK cycle.

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