TLV2544, TLV2548

2.7V TO 5.5V, 12BIT, 200KSPS, 4/8CHANNEL, LOW POWER

SERIAL ANALOGTODIGITAL CONVERTERS WITH AUTOPOWERDOWN

SLAS198E − FEBRUARY 1999 − REVISED JUNE 2003

10

POST OFFICE BOX 655303

TLV2544/TLV2548 conversion modes (continued)

Table 4. TLV2544/TLV2548 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.