SCLK

CS

FS

SDI

INT

EOC

SDO

ID14

ID13

ID12

ID15

OD11 OD10

OD9

OD4

OD3

1

2

3

4

7

13

16

1

12

ID15

14

15

OD2

OD1

OD0

5

6

TLV2548-EP

www.ti.com

SLAS668 – OCTOBER 2009

Table 6. TLV2548 Conversion Mode (1) (2) (3) (continued)

CONVERSION

CFR

SAMPLING

OPERATION

MODE

D(6,5)

TYPE

•

Repeated conversions from a selected channel

•

CS or FS to start sampling/conversion

•

One INT generated after FIFO is filled up to the threshold

Normal

•

Host must serve INT by either 1) (FIFO read) reading out all of the FIFO

Repeat

01

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.

•

Same as normal sampling except CSTART starts each sampling and

Extended

conversion when CS is high.

•

One conversion per channel from a sequence of channels

•

CS or FS to start sampling/conversion

Normal

•

One INT generated after FIFO is filled up to the threshold

Sweep

10

•

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.

•

Same as normal sampling except CSTART starts each sampling and

Extended

conversion when CS is high.

•

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

Normal

•

Host must serve INT by either 1) (FIFO read) reading out all of the FIFO

Repeat sweep

11

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.

•

Same as normal sampling except CSTART starts each sampling and

Extended

conversion when CS is high.

Timing Diagrams

The timing diagrams can be categorized into two major groups: non-conversion and conversion. The

non-conversion cycles are read and write (configuration). None of these cycles carry a conversion. Conversion

cycles are those four modes of conversion.

Read Cycle (Read FIFO or Read CFR)

Read CFR Cycle

The read command is decoded in the first four clocks. SDO outputs the contents of the CFR after the fourth

SCLK. This command works only when the device is programmed in the single shot mode (mode 00).

Figure 2. TLV2548 Read CFR Cycle (FS active)

Copyright © 2009, Texas Instruments Incorporated

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