RT5509WSC datasheet(25/58 Pages) RICHTEK

25 / 58 page

RT5509

is a registered trademark of Richtek Technology Corporation

DS5509-00

August

2017

www.richtek.com

Volume Control

The volume control can be set from

127.5dB to 0dB,

with step = 0.5dB. The control timing is illustrated as in

Figure 18. When a new gain is set by I2C, the hardware

will change from the original setting in step of 0.5dB/∆T,

where ∆T is the step size with the following options :

∆T = 4, 8, 16, 32, 64 samples, or ∆T = 0 stands for no

ramping up / down is applied.

When mute mode is set by I2C or detected by hardware,

the volume setting is overruled, but the original gain

setting is kept in hardware, allows to be recovered to

the original state.

Volume control can be bypassed by register.

Gain (dB)

Time (spls)

Gold

Gnew

∆T

0.5dB

Figure 18. Volume Control Timing Graph

The threshold is normalized to 1 is passed to speaker

protection which equals to :

BAT

5 - (VBCPS - V

)

CPSLP

ClipThres (normalized) =



ClipThres (normalized) equals to 1 if signal is small and

never reaches to the threshold. When signal is large

and is clipped by this threshold, ClipThres (normalized)

will be sent to speaker protection block.

If battery voltage returns to a hysteresis level,

ClipThres will increase by a rate of CLIPRR to a certain

level which is defined by VBCPS, CPSLP and VBAT.

As ClipThres increases, speaker protection will also

increase its gain to let the signal return to its original

level. The battery voltage hysteresis can bet set via

BVHYS at register 0x0B.

RT5509WSC Datasheet(PDF) 25 Page - Richtek Technology Corporation

RT5509WSC Datasheet(HTML) 25 Page - Richtek Technology Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

Datasheet Download

Link URL