CS5521 datasheet(36/56 Pages) CIRRUS

36 / 56 page

CS5521/22/23/24/28

DS317F8

SDO line.

If, during the first 8 SCLKs,

"00000000" is provided on SDI, the converter will

remain in this conversion mode, and continue to

perform conversions on the selected Setup. To exit

this conversion mode, "11111111" must be provid-

ed on SDI during the first 8 SCLKs. If the user de-

cides to exit, 24 more SCLKs are required to read

the final conversion word from the data register and

return to command mode.

1.4.1.3 Repeated One-Setup Conversions with

Wait

(LP = 1 MC = 0 RC = 1)

In this conversion mode, the ADC will repeatedly

perform conversions, referencing only one Setup.

The 8-bit command word contains the CSRP bits,

which instruct the converter which Setup to use

when performing the conversion. Note that in this

mode, every conversion word must be read. The

part will wait for the current conversion word to be

read before performing the next conversion.

To perform repeated, one-Setup conversions with

wait, the MC bit must be set to '0', the LP bit must

be set to '1', and the RC bit must be set to '1' in the

Configuration Register. Then, the 8-bit command

word that references the desired Setup must be sent

to the converter. The ADC will then begin per-

forming conversions on the referenced Setup, and

SDO will fall to indicate when a conversion is com-

plete, and data is available. Thirty-two SCLKs are

then needed to read the conversion word from the

data register. The first 8 SCLKs are used to clear

the SDO flag. During the last 24 SCLKs, the data

word will be output from the converter on the SDO

line. If, during the first 8 SCLKs, "00000000" is

provided on SDI, the converter will remain in this

conversion mode, and continue to perform conver-

sions on the selected Setup after each data word is

read. To exit this conversion mode, "1111 1111"

must be provided on SDI during the first 8 SCLKs.

If the user decides to exit, 24 more SCLKs are re-

quired to read the final conversion word from the

data register and return to command mode.

1.4.1.4 Single, Multiple-Setup Conversions

(LP = 0 MC = 1 RC = X)

In this conversion mode, the ADC will perform sin-

gle conversions, referencing multiple Setups, and

return to command mode after the data for all con-

versions have been read. The CSRP bits in the

command word are ignored in this mode. Instead,

the Depth Pointer (DP3-DP0) bits in the Configu-

ration Register are accessed to determine the num-

ber of Setups to reference when collecting the data.

The number of Setups referenced will be equal to

(DP3-DP0) + 1, and will be accessed in order, be-

ginning with Setup1.

To perform single, multiple-Setup conversions, the

MC bit must be set to '1', and the LP bit must be set

to '0' in the Configuration Register. Then, the 8-bit

command word to start a conversion must be sent

to the converter. Because the CSRP bits of the

command word are ignored in this mode, a "start

convert" command referencing any of the available

Setups will begin the conversions. The ADC will

then perform conversions using the appropriate

number of Setups (as dictated by the DP bits in the

Configuration Register), beginning with Setup1.

The SDO line will fall after the final conversion to

indicate that the data is ready. Eight SCLKs, plus

24 SCLKs for each Setup referenced are required to

read the conversion words from the data FIFO. The

first 8 SCLKs are used to clear the SDO flag. Ev-

ery 24 bits thereafter consist of the data words of

each Setup that was referenced, until all of the data

has been read from the part. The data word from

Setup1 is output first, followed by the data word

from Setup2, and so on for the appropriate number

of Setups. The part returns to command mode im-

mediately after the final data word has been read,

and waits for the next command to be issued.

CS5521 数据表(PDF) 36 Page - Cirrus Logic

CS5521 数据表(HTML) 36 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

数据表下载