CS5397 datasheet(28/40 Pages) CIRRUS

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CS5396 CS5397

DS229PP2

2) Release the SDATA1 pin of the chip that is going to be programmed with chip address.

3) Send chip address and “addren”=’1’ (in Register 7) through the serial control port. (The re-

maining devices will not repond to this request.)

4) Repeat step 2) and step 3) for to other chips one-by-one. (SDATA1 output is tri-stated until

it is released from pull up.)

Digital Control & Peak Signal Level (address 00000111)

addren(chip address enable)

Default = ‘0’.

When this bit is ‘0’, no chip address comparison is done. The chip will response to all the request

from Control Port.

When this bit is ‘1’, the chip responds to the µC only if the chip address from the µC matches

the chip address stored in “caddr(6-0)”.

pken(PEAK enable) Default = ‘0’.

PSL bits calculation is based on the high precision 24-bit output.

PSL bits output follows the serial audio port that sends out 24-bit data.

If this bit is disabled, the PSL bits location on the output stream will be replaced by zeros.

pkupdate(PEAK update)

Default = ‘0’.

A ‘0’ to ‘1’ transition will load the peak value (since the last update) to the appropriate serial au-

dio port. The internal peak register will then reset to ‘0’.

hr/_bg(PEAK display format)

Default = ‘0’.

High resolution tag format (hr/_bg=’1’) converts the 24-bit decimation filter output into 1 dB step.

Bar Graph tag format (hr/_bg=’0’) allows LCD display format of the 24-bit output with 8 discrete

values.

ddpd(digital filter power down enable)

Default = ‘0’.

The digital filter and serial audio port is in power down mode when ddpd = ‘1’.

fir2in(external fir2 input enable)

Default = ‘0’.

Input of 2nd stage decimation filter is taken from the sdata2 port. The input data will be deci-

mated by 2 and then output to sdata1 of serial audio port.

psychoin (external psychoacoustic filter input enable)

Default = ‘0’.

Input of psychoacoustic filter is taken from the sdata2 port. The 24-bit input data will be truncat-

ed in psychoacoustic filter to the chosen output word length and then output to sdata1 of serial

audio port.

765

4321

ADDREN

pken

pkupdate

hr/_bg

ddpd

fir2in

psychoin

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