DAC5578_10 Datasheet, PDF(40/55 Page) Texas Instruments – 8-/10-/12-Bit, Octal-Channel, Ultra-Low Glitch, Voltage Output, Two-Wire Interface Digital-to-Analog Converters

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DAC5578_10 Datasheet, PDF (40/55 Pages) Texas Instruments – 8-/10-/12-Bit, Octal-Channel, Ultra-Low Glitch, Voltage Output, Two-Wire Interface Digital-to-Analog Converters

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DAC5578

DAC6578

DAC7578

SBAS496A â MARCH 2010 â REVISED AUGUST 2010

OPERATING EXAMPLES: DAC7578

For the following examples X = donât care; value can be either '0' or '1'.

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

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

Start

Address

1001 0000

ACK

Command and

Access Byte

0000 0000

ACK

MSDB

1000 0000

ACK

LSDB

0000 XXXX

ACK

Stop

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

Start

Address

1001 0000

ACK

SPACER

Command and

Access Byte

0100 XXXX

ACK

MSDB

X111 0000

ACK

LSDB

110X XXXX

ACK

Stop

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

Start

Address

1001 0000

SPACER

ACK

Command and

Access Byte

0000 0110

ACK

Repeated

Start

Address

1001 0001

ACK

MSDB (from

DAC7578)

XXXX XXXX

ACK

LSDB (from

DAC7578)

XXXX 0000

Example 4: Write multiple bytes of data to Channel F.

Write Full Scale and then Quarter Scale to Channel F

Start

Address

1001 0000

ACK

Command and

Access Byte

0000 0101

ACK

MSDB

1111 1111

ACK

LSDB

1111 XXXX

ACK*

MSDB

0100 0000

ACK

LSDB

0000 XXXX

ACK**

Stop

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.

SPACER

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.

Start

Master

Code

0000 1000

NOT Repeated

ACK Start

Address

Command

ACK and Access ACK

Byte

MSDB

ACK

1001 0000

0011 1111

1000 0000

LSDB

0000 XXXX

ACK

MSDB ACK LSDB

ACK

1111 1111

1111 XXXX

Stop

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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Product Folder Link(s): DAC5578 DAC6578 DAC7578

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