TLC1514, TLC1518

5-V, 10-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER,

SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN

SLAS252 – DECEMBER 1999

16

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

modes using the FIFO: modes 01, 10, 11 timing (continued)

Mode 10 (sweep mode) requires reconfiguration at the start of each new sweep sequence. Once the FIFO is

filled up to the programmed threshold, the host has the option to either read the FIFO or configure for other

modes. Once the FIFO is read, the host must reconfigure the device before the next sweep sequence can be

started. So the sequence is either configure : triggered conversions : FIFO read : configure. or configure :

triggered conversions : configure : .... Each configure clears the FIFO and the action that follows the configure

command depends on the mode setting of the device.

Mode 11 (repeat sweep mode) requires one cycle configuration. This sweep sequence can be repeated without

reconfiguration. Once the FIFO is filled up to the programmed threshold, the host has the option to either read

the FIFO or configure for other modes. So the sequence is either configure : triggered conversions : FIFO read

: triggered conversions : FIFO read ... or configure : triggered conversions : configure : .... Each configure clears

the FIFO and the action that follows the configure command depends on the mode setting of the device.

CS

CSTART

SDI

INT

SDO

From Channel 0

FS

(DSP)

From Channel 3

Configure

Conversion

Conversion

Read FIFO

#1

#2

#3

#4

Top of FIFO

‡

‡

†

‡‡

‡

tsample(1)

Read FIFO

#1

From Channel 0

Conversion

From Channel 3

Conversion

Repeat

Second FIFO Read

Repeat

tsample(2)

tsample(3)

First FIFO Read

tconvert

tconvert

tSample(i) > = MIN(tSample)

tsample(4)

† Command = Configure write for mode 10 or 11, FIFO threshold = 1/2, sweep seq = 0–1–2–3.

‡ Command = Read FIFO

Figure 12. TLC1514/TLC1518 Mode 10/11 DSP Serial Interface (conversions triggered by FS)