LTC2309 Linear Technology Corporation, LTC2309 Datasheet - Page 16

• Manufacturer Part Number: LTC2309
• Description: 12-Bit SAR ADC
• Manufacturer: Linear Technology Corporation

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LTC2309
Continuous Read/Write
Once the conversion cycle is complete, the LTC2309 can
be written to and then read from using the Repeated
Start (Sr) command. Figure 10 shows a cycle which
begins with a data Write, a repeated Start, followed
by a Read and concluded with a Stop command. The
following conversion begins after all 16 bits are read
out of the device or after a Stop command. The fol-
lowing conversion will be performed using the newly
programmed data.
Synchronizing Multiple LTC2309s with a Global
Address Call
In applications where several LTC2309s or other I
ADCs from Linear Technology Corporation are used on
APPLICATIONS INFORMATION
16
CONVERSION
CONVERSION
S
SDA
SCL
7-BIT ADDRESS
S
GLOBAL ADDRESS
NAP
LTC2309
Figure 11. Syncrhonous Multiple LTC2309s with a Global Address Call
NAP
W ACK WRITE
DATA OUTPUT
Figure 10. Write, Read, Start Conversion
W ACK WRITE (OPTIONAL)
LTC2309
DATA OUTPUT
2
C SAR
Sr
7-BIT ADDRESS
the same I
through the use of a global address call. Prior to issu-
ing 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 ac-
knowledge the request. The master then sends a write
byte (optional) followed by the Stop command. This will
update the channel selection (optional) and simultane-
ously initiate a conversion for all ADCs on the bus (see
Figure 11). In order to synchronize multiple converters
without changing the channel, a Stop command 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.
CONVERSION
2
C bus, all converters can be synchronized
CONVERSION OF ALL LTC2309s
P
R ACK
OUTPUT
LTC2309
DATA
READ
CONVERSION
P
2309 F11
2309 F10
2309f