Cirrus-logic CS42L73 User Manual download pdf (Page 51)

DS882F1 51

CS42L73

4.7 Analog Output Current Limiter

The CS42L73 features built-in current-limit protection for both the headphone and line output amplifiers. The

approximate current through VCP during the short circuit conditions shown in Figure 23 and Figure 24 is

described in Table 3.

Note: 100  is always required in series with the line-output amplifiers. These amplifiers must never be

shorted directly to ground.

While the values in Table 3 show that the device is protected from permanent damage during a short circuit,

they do not represent maximum specification. See “DC Electrical Characteristics” on page 21.

4.8 Serial Ports

The three independent, highly configurable, serial ports XSP, ASP, and VSP communicate audio and voice

data to and from other devices in the system, such as application processors, Bluetooth transceivers, and

cell-phone modems.

4.8.1 Power Management

The XSP and ASP have separate power-down controls (PDN_XSP_SDOUT, PDN_XSP_SDIN, PDN_

ASP_SDOUT, and PDN_ASP_SDIN) for their input and output data paths. Separating power state con-

trols minimizes power consumption if only monoplex communication is required (e.g., music playback).

The VSP, being targeted for duplex voice communication, has a single power-down control, PDN_VSP.

4.8.2 I/O

Each serial port interface consists to four signals (x = X, A, or V):

• xSP_SCLK Serial data shift clock

• xSP_LRCK Left/right clock

• Identifies the start of each serialized data word

• Identifies where each channel (left or right) is located within the data

word when I²S format (refer to section “I²S Format” on page 55) is used

Amplifier

()

Maximum Current (mA)

HPOUTx

3.3 120

0120

LINEOUTx 0 120

Table 3. Current through VCP with Varying Short Circuits

GND/AGND

VCP

HPOUTA

HPOUTB

GND/AGND

VCP

LINE OUTA

LINE OUTB

100 

Figure 23. HP Short Circuit Setup Figure 24. Line Short Circuit Setup

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 138 139

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Cirrus-logic CS42L73 User Manual Page 51

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