lm4985tmx National Semiconductor Corporation, lm4985tmx Datasheet - Page 26

• Manufacturer Part Number: lm4985tmx
• Description: Stereo 135mw Low Noise Headphone Amplifier With Selectable Capacitively Coupled Or Output Capacitor-less Ocl Output And Digitally Controlled I2c V
• Manufacturer: National Semiconductor Corporation

www.national.com
I
Table 1 shows the actions that are implemented by manipulating the bits within the two internal I
2
Register
Register
Address
C Control Register
Control
Select
Mode
I2C
D7
D7
0
0
0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
WT1
A6
D6
D6
X
X
X
X
X
X
X
X
X
X
X
1
0
0
0
0
1
1
Table 1. LM4985 I
LM4985 I2C Contorl Register Addressing and Data Chart
WT0
A5
D5
D5
X
X
X
X
X
X
X
X
X
X
X
1
0
0
0
1
0
1
PHG
A4
D4
D4
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
1
0
2
C Control Register Addressing and Data Format Chart
SDCH1
D3
D3
A3
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
1
1
SDCH2
A2
D2
D2
X
X
X
X
X
X
X
X
X
X
X
1
0
0
0
1
0
1
26
CHSEL1
RS1
A1
D1
X
X
X
X
X
X
X
X
X
X
X
1
0
0
0
0
1
1
CHSEL2
RS0
A0
A0
D0
02
X
X
X
X
X
X
X
X
X
X
X
0
1
1
0
1
Amplifier’s Chan. 1 is Input 1,
Amplifier’s Chan. 1 is Input 1,
Amplifier’s Chan. 1 is Input 2,
Amplifier’s Chan. 1 is Input 2,
Wake-up time: 110ms (OCL),
Wake-up time: 170ms (OCL),
Wake-up time: 290ms (OCL),
Wake-up time: 80ms (OCL),
2
D7 must always be set to 0
Output capacitor-less mode
Output capacitor-less mode
Read and write the volume
C control registers.
Read and write the mode
Amplifier’s SHUTDOWN
Amplifier’s SHUTDOWN
1650ms (C-CUPL)
Chan 2. is Input 2
Chan 2. is Input 1
Chan 2. is Input 2
Chan 2. is Input 1
250ms (C-CUPL)
450ms (C-CUPL)
850ms (C-CUPL)
control register
control register
mode inactive
mode active
Illegal mode
Illegal mode
Function
inactive
active