CS44800 datasheet(74/80 Pages) CIRRUS

74 / 80 page

DS632F1

CS44800

7.32.2

Power Supply Rejection Reset (PSR_RESET)

Default = 0

0 - force reset condition

1 - remove reset condition

Function:

This bit is used to assert a reset condition to the on-card PSR components. When set to a ‘0’b, the

PSR_RESET signal will be asserted low. The reset condition will continue as long as this bit is set to a

‘0’b. This bit must be set to a ‘1’b for proper PSR operation.

7.32.3

Power Supply Rejection Feedback Enable (FEEDBACK_EN)

Default = 0

0 - disable

1 - enable

Function:

Enables the internal power supply rejection feedback logic.

7.32.4

Power Supply Sync Clock Divider Settings (PS_SYNC_DIV[2:0])

Default = 000

Function:

These three bits determine the divider for the XTAL clock signal for generating the PS_SYNC clock signal.

7.33

Decimator Shift/Scale (addresses 35h, 36h, 37h)

7.33.1

Decimator Shift (DEC_SHIFT[2:0])

Default = 010

Function:

These bits are used to scale the power supply reading (Decimator Outd (addresses 3Bh, 3Ch, 3Dh)) dur-

ing

the

PSR

feedback

calibration

sequence.

The

combination

shift

and

scale

factors

(DEC_SCALE[18:0]*2^(DEC_SHIFT[2:0])) can be viewed as a floating point coefficient. The floating point

coefficient will be determined during the PSR feedback calibration sequence. See Decimator Scale

(DEC_SCALE[18:0]) register description and “Recommended PSR Calibration Sequence” on page 44.

PS_SYNC_DIV[2:0]

PS_SYNC Clock Divider

000

Output Disabled

001

Divide by 32

010

Divide by 64

011

Divide by 128

100

Divide by 256

101

Divide by 512

110

Divide by 1024

Table 17. Power Supply Sync Clock Divider Settings

RESERVED

DEC_SHIFT2

DEC_SHIFT1

DEC_SHIFT0

RESERVED

DEC_SCALE18 DEC_SCALE17 DEC_SCALE16

DEC_SCALE15 DEC_SCALE14 DEC_SCALE13 DEC_SCALE12 DEC_SCALE11 DEC_SCALE10 DEC_SCALE09 DEC_SCALE08

DEC_SCALE07 DEC_SCALE06 DEC_SCALE05 DEC_SCALE04 DEC_SCALE03 DEC_SCALE02 DEC_SCALE01 DEC_SCALE00

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