TSC2301 datasheet(82/92 Pages) TI

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TSC2301

SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004

Bit 1 — SSRTE

Volume Soft-stepping Rate Select. This bit selects the speed of the soft-stepping function of the TSC2301

volume controls. At normal speed, the actual volume is updated approximately once every 20 µs. At half speed,

the actual volume is updated approximately once every 40 µs.

Table 47. Volume Soft-Stepping Rate Select

SSRTE

Description

Normal step rate used (default).

Half step rate used.

Bit 0 — SSTEP

Soft-step Flag. This read-only bit indicates that the TSC2301 volume control soft-stepping is completed.

Table 48. Soft-Step Flag

SSTEP

Description

Soft-stepping is not complete.

Soft-stepping is complete (default).

AUDIO POWER CONTROL REGISTER (Page 2, Address 05H)

The audio power / miscellaneous control register of the TSC2301 controls the powering down of various audio

blocks of the TSC2301. The default state of the TSC2301 has all audio blocks powered down. Before using any

of the audio blocks, they must be powered up by writing to this register. This register also controls the crystal

oscillator clock and buffer, the bass-boost filter, and the de-emphasis filter.

The audio power / miscellaneous control register is formatted as follows:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

MSB

LSB

APD

AVPD

ABPD

HAPD

MOPD

DAPD ADPD ADPD PDSTS MIBPD

OSC

BCKC

SMPD

OTSY

BASS

DEEM

For bits 15 through 8 of this register, writing a 1 to a selected bit powers down the affected section, writing a 0

powers up the section.

Bit 15 — APD

Audio Power Down. This bit powers down the entire audio section if set, regardless of the settings of the other

bits in this register. When this bit is cleared, the individual sections of the audio codec still need to be powered

up individually. The settings of the other bits in the register are retained when this bit is set and cleared. The

default is 1 (powered down).

Bit 14 — AVPD

Audio VCM Power Down. If this is set to 1, the VCM powers up whenever it is needed (such as when the audio

ADC, DAC, or bypass path is enabled) and powers down when no longer needed. If this bit is set to 0, after an

audio component is powered up and causes VCM to power up, it no longer powers down, even if all audio

components are powered down. This is intended to avoid the 500 µs delay needed for VCM to power up slowly.

The default is 1 (powered down).

Bit 13 — ABPD

Audio Bypass Path Power Down. This is used to power up (set to 0) or power down (set to 1) the audio bypass

path. The default is 1 (powered down).

Bits 12 — HAPD

Headphone Amplifier Power Down. This is used to power up (set to 0) or power down (set to 1) the headphone

amplifier. The default is 1 (powered down).

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