START

MSB

DEVICE ADDRESS

LSB

ACK

SCL

SDA

STOP

MSB

REGISTER DATA

LSB

ACK

R/W

LM49200, LM49200TLEVAL

www.ti.com

SNAS459A – MAY 2009 – REVISED APRIL 2013

Figure 34. Start and Stop Diagram

Table 1. Chip Address

A7

A6

A5

A4

A3

A2

A1

A0

Chip Address

1

1

1

1

1

0

0

0

Table 2. Control Registers(1)

Register

D7

D6

D5

D4

D3

D2

D1

D0

Turn_On

Shutdown Control

0

0

0

HPR_SD(2)

0

I2CVDD_SD

(3)

Power_On(5)

_Time(4)

Output Mode Control

0

1

0

EP_Mode(6)

Mode_Control(7)

Headphone Output

1

0

0

0

0

HP_Gain(8)

Gain Control

Mono Input Volume

1

0

1

Mono_Vol(9)

Control

Left Input Volume

1

1

0

Left_Vol(9)

Control

Right Input Volume

1

1

1

Right_Vol(9)

Control

(1)

Notes: All registers default to 0 on initial power-up.

(2)

HPR_SD: Right channel shutdown control. See Table 3.

(3)

I2CVDD_SD: Control Enable Function. I

2CV

DD can be used to act as a hardware reset input. See Table 3.

(4)

Turn_On_Time: Reduces the turn on time for faster activation. See Table 3.

(5)

Power_On: Master Power on bit. See Table 3.

(6)

EP_Mode: EP (Receiver) Mode control. Right loudspeaker channel can be used as earpiece path. See Table 4.

(7)

Mode_Control: Sets the output mode. See Table 4.

(8)

HP_Gain: Sets the headphone amplifier output gain. See Table 5

(9)

Mono_Vol/Left_Vol/Right_Vol: Sets the input volume for Mono, Left and Right inputs. See Table 6.

Table 3. Shutdown Control Register

Bit

Name

Value

Description

This bit is a master shutdown control bit and sets the device to be on or off.

Value

Status

0

Power_On

0

Master power off, device disable.

1

Master power on, device enable.

This bit sets the turn on time of the device.

Value

Status

1

Turn_On_Time

0

Normal Turn-on time

1

Fast Turn-on time

This bit allows the I2C supply voltage to be used as a reset signal.

Value

Status

I2CVDD acts as an active low reset input. If I

2CV

DD drops below 1.1V,

2

I2CVDD_SD

0

the device resets and the I2C registers are restored to their default

state.

1

Normal Operation. I2CVDD voltage does not reset the device.

This bit is used when only one channel of the headphone amplifier is needed.

4

HPR_SD

0

Normal headphone operation.

1

Mono headphone output at left channel, right headphone in shutdown.

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