LM49352 datasheet(32/106 Pages) TI

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LM49352

SNAS467E – MARCH 2009 – REVISED MARCH 2013

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Table 2. Nonzero I2C Default Registers (continued)

Address

Default Data Value

0xA8h

DAC_L_LEVEL

0x33h

0xA9h

DAC_R_LEVEL

0x33h

0xF0h

RESET

0x02h

Basic PMC Setup Register

This register is used to control the LM49352's Basic Power Management Setup:

Table 3. PMC_SETUP (0x00h)

Bits

Field

Description

When this bit is set the power management will enable the MCLK I/O or internal oscillator(1). It will then

use this clock to sequence the enabling of the analog references and bias points. When this bit is

cleared the PMC will bring the analog down gently and disable the MCLK or oscillator.

CHIP_ENABLE

CHIP _ENABLE

Chip Status

Turn Chip Off

Turn Chip On

This enables the PLL.

PLL_ENABLE

PLL Status

PLL_ENB

PLL Off

PLL On

This enables the P2 output of the PLL.

PLL_P2ENB

PLL P2 Status

PLL_P2ENB

PLL P2 Off

PLL P2 On

This enables the internal 300kHz Oscillator. For analog only chip modes, the oscillator can be used

instead of an external system clock to drive the chip's power management (PMC).

OSC_ENABLE

Oscillator Status

OSC_ENB

Oscillator Off

Oscillator On

This forces the MCLK input to enable, regardless of requirement. If set, the audio ports and digital mixer

can be activated even if the chip is in shutdown mode. This assumes that MCLK is selected as the PMC

clock source (reg 0x01h) and that there is an active clock signal driving the MCLK pin. Setting this bit

reduces power consumption, by allowing audio ports and digital mixer to operate while the analog

sections of the chip are powered down.

MCLK_OVR

Comment

I/O control is automatic

MCLK input forced on.

This forces the clock input of Audio Port 1 input to enable, regardless of other port settings.

PORT1_CLK_OVR

Comment

PORT1_CLK_OVR

I/O control is automatic

PORT_CLK input forced on

This forces the clock input of Audio Port 2 input to enable, regardless of other port settings.

PORT2_CLK_OVR

Comment

PORT2_CLK_OVR

I/O control is automatic

PORT_CLK input forced on

CHIP_ACTIVE

This bit is used to readback the enable status of the chip.

(1)

If the PMC is set to operate from one of the audio ports then it will wait for the port to be enabled or the relevant override bit to be set,

forcing the port clock input to enable.

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