CS4525 datasheet(49/98 Pages) CIRRUS

49 / 98 page

DS726PP1

CS4525

6.1.8.5

PWM_SIG Logic-Level Output Configurations

Four channel mapping output configurations are supported for the PWM_SIG output pins as shown in

Table 10 below. The configurations support stereo, channel 1 with sub, and channel 2 with sub applica-

tions. When disabled, the PWM_SIG pins will continuously drive a logic ‘0’ if the HiZPSig bit is set and will

be held in a high-impedance state if the HiZPSig bit is clear. The configurations are selected by the PW-

MDSel[1:0] bits in the Output Cfg register. The PWM_SIG2 can be configured to output the sub channel

even if the Bass Manager is not enabled; however, its signal will be muted unless the Bass Manager is

enabled by the BassMgr[2:0] bits. It should be noted that the HiZPSig bit must be set to enable the

PWM_SIG output drivers.

To allow stereo headphone operation when the PWM logic-level outputs are mapped in a non-stereo out-

put configuration, if the HP_DETECT/MUTE pin is configured for headphone detection (the HP/Mute bit

is set), the PWM logic-level output mapping can be affected by the active state of the headphone detection

input signal. See the Headphone Detection & Hardware Mute Input section on page 51 for more informa-

tion.

It should be noted that signal on channels 1, 2, and the sub channel are dependent upon the digital sound

processing blocks being used. For instance, if the 2-way crossover is enabled, channel 1 and 2 contain

the 2-way crossover channel A high- and low-pass outputs respectively. For more information, see the

Digital Sound Processing section and Figure 14 on page 29.

PWMDSel[1:0]

PWM_SIG1

PWM_SIG2

Disabled.

Channel 1

Channel 2

Channel 1

Sub Channel

Channel 2

Sub Channel

Table 10. PWM Logic-Level Output Configurations

Referenced Control

PWMDSel[1:0]..................... “PWM Signals Output Data Select (PWMDSel[1:0])” on page 73

HiZPSig ............................... “Hi-Z PWM_SIG Outputs (HiZPSig)” on page 79

HP/Mute .............................. “HP_Detect/Mute Pin Mode (HP/Mute)” on page 70

BassMgr[2:0] ....................... “Bass Cross-Over Frequency (BassMgr[2:0])” on page 79

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