LTC2487 Linear Technology, LTC2487 Datasheet - Page 21

• Manufacturer Part Number: LTC2487
• Description: 16-Bit 2-/4-Channel ADC
• Manufacturer: Linear Technology

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applicaTions inForMaTion
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 I
delta-sigma ADCs from Linear Technology Corporation)
are used on the same I
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
CONVERSION
S
7-BIT ADDRESS
SDA
SCL
CONVERSION
S
S
2
C bus, all converters can be syn-
7-BIT ADDRESS
ALL LTC2487s IN SLEEP
LTC2487
GLOBAL ADDRESS
Figure 9. Start a New Conversion Without Reading Old Conversion Result
SLEEP
Figure 10. Synchronize Multiple LTC2487s with a Global Address Call
W ACK
SLEEP
DATA INPUT
W ACK
Figure 8. Write, Read, Start Conversion
WRITE
LTC2487
W ACK
WRITE (OPTIONAL)
DATA INPUT
Sr
2
WRITE (OPTIONAL)
C
DATA INPUT
7-BIT ADDRESS
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.
ADDRESS
…
CONVERSION
P
P
LTC2487
R
CONVERSION OF ALL LTC2487s
ACK
DATA OUTPUT
READ
2487 F09
CONVERSION
P
LTC2487
2487 F10
2487 F08

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