Rainbow-electronics AT73C246 Manual do Utilizador descarregar pdf (Página 59)

11050A–PMAAC–07-Apr-10

AT73C246

Figure 12-4. AC / DC Coupled Load Management Schematic View

Figure 12-5. Audio Codec Typical Startup and Shutdown Waveforms With AC Coupled Loads.

12.4.1.3 MUTE Register

By default, the audio codec starts muted. To enable the audio processing, the MUTE register

(0x15) must be cleared. Unmute operation can be performed before or after releasing the

STANDBY mode. During operation, this register provides a convenient way of muting the audio

signal without changing the various gain registers.

12.4.1.4 Master Clock Input (MCLK)

The Audio Controller is clocked by MCLK pin. Therefore a clock must be present at this pin

before each codec control change. Particularly, the master clock must be present at power-on,

power-off, gain change, path change. The master clock must also be available when fully analog

path are used.

12.4.1.5 Power-off Conditions

Three audio codec power-off conditions can occur:

• Sofware request (ENAC = 0 in AUTOSTART register). In this case, the codec is smoothly

powered off by the audio controller.

• PMU Power-off event or Standby event (as defined in Section 11.3 “Power Manager

Conditional Transitions” on page 27). In this case, the codec is smoothly powered off with a

AT 7 3C246

VMID

AGND

AVDD

VDD4

VIN4

LDO4

200k

10uF

200k

ENAC

1uF

HPL

HPR

DCBLOCK.ONHP

LEFT

RIGHT

VMID

BUFFER

VDD4

VMID

HP(L/R)

DCBLOCK

ENAC

STANDBY

S1 & S2

S1 AND S2 OPENED

BY AUDIO CODEC

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 158 159

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