LTC2487 datasheet(21/32 Pages) LINER

21 / 32 page

LTC2487

2487fa

Figure 10. Synchronize Multiple LTC2487s with a Global Address Call

Figure 8. Write, Read, Start Conversion

Figure 9. Start a New Conversion Without Reading Old Conversion Result

7-BIT ADDRESS

CONVERSION

ADDRESS

SLEEP

DATA OUTPUT

DATA INPUT

7-BIT ADDRESS

W ACK

ACK

WRITE

READ

2487 F08

7-BIT ADDRESS

CONVERSION

SLEEP

DATA INPUT

W ACK

WRITE (OPTIONAL)

2487 F09

GLOBAL ADDRESS

SCL

SDA

…

ALL LTC2487s IN SLEEP

CONVERSION OF ALL LTC2487s

DATA INPUT

W ACK WRITE (OPTIONAL)

2487 F10

LTC2487

can be written into the device and a Stop command will

initiate the next conversion (see Figure 9).

Synchronizing Multiple LTC2487s with a Global

Address Call

In applications where several LTC2487s (or other I2C

delta-sigma ADCs from Linear Technology Corporation)

are used on the same I2C bus, all converters can be syn-

chronized through the use of a global address call. Prior

to issuing the global address call, all converters must have

completed a conversion cycle. The master then issues a

Start, followed by the global address 1110111, and a write

request. All converters will be selected and acknowledge

the request. The master then sends a write byte (optional)

followed by the Stop command. This will update the chan-

nel selection (optional) converter configuration (optional)

and simultaneously initiate a start of conversion for all

delta-sigma ADCs on the bus (see Figure 10). In order

to synchronize multiple converters without changing

the channel or configuration, a Stop may be issued after

acknowledgement of the global write command. Global

read commands are not allowed and the converters will

NAK a global read request.

applicaTions inForMaTion

LTC2487 Datasheet(PDF) 21 Page - Linear Technology

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