STA321 datasheet(83/157 Pages) STMICROELECTRONICS

83 / 157 page

STA321

Doc ID 15351 Rev 3

83/157

FFXCFG2

Address:

0x02

Type:

Reset:

0x2D

Description:

Note:

Particular care must be taken when bits NS_ORD and PWM_FREQ are changed. To avoid

any audible artifacts, these bits must be modified only with the following procedure:

Mute STA321 processing.

Change PWM_FREQ and/or NS_ORD and set RESET_NOISH = 1.

Configure RESET_NOISH = 0.

Unmute STA321 processing.

765432

RESET_NOISH

PWM_FREQ

NS_ORD[1:0]

EA_TSFT_ON

CB_TSFT_ON

EA_PFDIG

CB_PFDIG

[7] RESET_NOISH

1: a reset is forced to the noise-shaper block

[6] PWM_FREQ

0: 4 fS (4*96 kHz = 384 kHz)

1: 8 fS (8*96 kHz = 768 kHz)

[5:4] NS_ORD[1:0]

Noise shape order

00: 3rd. order

01: 4th. order

10: 5th. order

[3] EA_TSFT_ON

1: if there is a fault on the external bridge, it will be put in 3-state

[2] CB_TSFT_ON

1: if there is a fault on the CMOS bridge, it will be put in 3-state

[1] EA_PFDIG

1: enable the pop-free ramp of EA

[0] CB_PFDIG

1: enable the pop-free ramp of CB

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