Datasheet

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SLAS251A − DECEMBER 1999 − REVISED JANUARY 2003
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TLV1504/TLV1508 conversion modes (continued)
Table 4. TLV1504/TLV1508 Conversion Mode
CONVERSION
MODE
CFR
D(6,5)
SAMPLING
TYPE
OPERATION
One shot 00
Normal • Single conversion from a selected channel
• CS
or FS to start select/sampling/conversion/read
• One INT
or EOC generated after each conversion
• Host must serve INT
by selecting channel, and converting and reading the previous output.
Extended • Single conversion from a selected channel
• CS
to select/read
• CSTART
to start sampling and conversion
• One INT
or EOC generated after each conversion
• Host must serve INT
by selecting next channel and reading the previous output.
Repeat 01
Normal • Repeated conversions from a selected channel
• CS
or FS to start sampling/conversion
• One INT
generated after FIFO is filled up to the threshold
• Host must serve INT
by either 1) (FIFO read) reading out all of the FIFO contents up to the
threshold, then repeat conversions from the same selected channel or 2) writing another
command(s) to change the conversion mode. If the FIFO is not read when INT
is served, it is
cleared.
Extended • Same as normal sampling except CSTART starts each sampling and conversion when CS is
high.
Sweep 10
Normal • One conversion per channel from a sequence of channels
• CS
or FS to start sampling/conversion
• One INT
generated after FIFO is filled up to the threshold
• Host must serve INT
by (FIFO read) reading out all of the FIFO contents up to the threshold, then
write another command(s) to change the conversion mode.
Extended • Same as normal sampling except CSTART starts each sampling and conversion when CS is
high.
Repeat sweep 11
Normal • Repeated conversions from a sequence of channels
• CS
or FS to start sampling/conversion
• One INT
generated after FIFO is filled up to the threshold
• Host must serve INT
by either 1) (FIFO read) reading out all of the FIFO contents up to the
threshold, then repeat conversions from the same selected channel or 2) writing another
command(s) to change the conversion mode. If the FIFO is not read when INT
is served it is
cleared.
Extended • Same as normal sampling except CSTART starts each sampling and conversion when CS is
high.
NOTES: 1. Programming the EOC/INT pin as the EOC signal works for mode 00 only. The other three modes automatically generate an INT
signal irrespective of how EOC/INT is programmed.
2. Extended. Sampling mode using CSTART
as the trigger only works when internal reference is selected for conversion modes 01,
10, and 11.
3. When using CSTART to sample in extended mode, the falling edge of the next CSTART trigger should occur no more than 2.5 µs
after the falling CS
edge (or falling FS edge if FS is active) of the channel select cycle. This is to prevent an ongoing conversion from
being canceled.