RT5508 datasheet(13/57 Pages) RICHTEK

13 / 57 page

RT5508

is a registered trademark of Richtek Technology Corporation

DS5508-01

March

2017

www.richtek.com

Operation Mode Modes

The RT5508 can operate in six different modes which

are

power-down/suspend/operating/mute/off/fault.

Internal functional block operational status in different

mode is depicted in Figure 5.

PLL

I2C

I2S

AMP

SPK

PWDN

MUTE

OFF

FAULT

Mode

Blk

SUSP

: Normal operation

: Operational with zero input

: Power down

: Output floating

Figure 5. Operation Mode

Power-Down mode (PWDN = 1)

When PWDN is set to 1, chip will enter power-down

mode.

In power-down mode, power consumption is minimum

and PWM outputs are floating.

I2C remains awake in power-down mode.

If PWDN is set to 1, I2S is also disabled.

Suspend mode (BCK/LRCK Invalid)

When BCK/LRCK is invalid, chip will enter suspend

mode.

In suspend mode, most of the data path are off, and

PWM outputs are floating.

I2C remains awake in power-down mode.

PLL keeps awake used to monitor BCK/LRCK on I2S

bus to see if they are correct.

Operating mode (PWDN = 0, SPKE = 1, SPKM = 0,

AMPE = 1)

Operating

mode

selected

via

PWDN/SPKE/

SPKM/AMPE at register 0xXX. One of I2S interface

(DATA1/DATA2) is selected as the audio source. In

operating mode, the frequency of LRCK should be the

same as I2SFS.

Mute mode (PWDN = 0, SPKE = 1, SPKM = 1, AMPE

= 1)

Soft muting is used to prevent pop noise and is

implemented in the speaker protection block when

SPKE set to logic 1. Ramp up/down in exponential

scale are implemented when switching between muted

and unmuted mode.

Off mode (PWDN = 0, SPKE = 1, AMPE = 0)

The outputs of class-D are floating and chip is biased in

off mode.

Soft mute can be executed if AMPDS at register 0xXX

equals to 1 before chip enters off mode.

Fault Mode

Chip enters fault mode when an error event of physical

protection mechanisms occurs (OCP/OVP/UVP/OTP).

The outputs of class-D are floating in Fault mode. The

system exits from Fault mode after the protection event

released for a checking cycle of about 200ms.

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