PCM5310PAP datasheet(33/103 Pages) TI

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HEADPHONE SHORT-CIRCUIT PROTECTION

HeadphoneJack

HPOLorHPOR

ProtectionResistor

Headphone

or32

Current

Monitor

Increment

Decrement

Counter

Short

orNot

GPIO

Control

Headphone

Amplifier

Enable/Disable

InternalClock

InternalResistor

GPIO1,GPIO2,orGPIO3

Detect/ReleaseTime

4096f :85.2msatf =48kHz

8192f

:1704msatf =48kHz

16384f

:340.8msatf =48kHz

32768f

:681.6msatf =48kHz

PCM5310

www.ti.com ............................................................................................................................................................................................ SLES244 – FEBRUARY 2009

The PCM5310 has short-circuit protection for each headphone output. The short-circuit status can be read from

the GPIO pins and the register data can be read through the I2C interface. The short-circuit detection time can be

internally adjusted to avoid the headphone amplifier shutting down when inserting or removing the headphone

jack. The descriptions for the headphone and short-circuit protection registers are shown in Table 19. The

headphone short-circuit protection sequence is shown in Figure 40.

Table 19. Headphone Short-Circuit Protection Registers

Headphone short-circuit protection enable/disable

SRCR, SHCR, SPDR, SRCL, SHCL, SPDL

Headphone short-cicuit protection detect time

SDTR[1:0], SDTL[1:0]

Headphone short-circuit protection release time

SRTR[1:0], SRTL[1:0]

Headphone short-circuit protection status read

SSHR, SSHL

Figure 40. Headphone Short-Circuit Protection Sequence

When the short-circuit protection is enabled, it is recommended to insert a small protection resistor to limit

over-current flow. Table 20 shows the headphone output power with a small resistor.

Table 20. Headphone Amplifier Output Power Load

RL = 32 Ω + PROTECTION RESISTOR

Ω + 4 Ω

Ω + 8 Ω

Ω + 16 Ω

0.1% THD

28 mW

22 mW

16 mW

10% THD

37 mW

31 mW

22 mW

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