LM4970

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SNVS312D – JANUARY 2005 – REVISED MAY 2013

Table 4. Frequency Select Register

Default

Data Bit

Bit Name

Condition

Function

Value

Programs the oscillation frequency of the PWM. PWM oscillation frequency is

0

set as follows:

FSO

PWM_FO

0

1

PWM_F<1:0>

PWM Frequency

00

15kHz

0

01

60Hz

FS1

PWM_F1

0

10

7Hz

1

11

4Hz

0

FS2

RSVD

0

RESERVED

1

0

Programs the internal high pass filter cutoff frequency. High pass filter cutoff

FS3

HPF_FO

0

frequency is set as follows:

1

0

HPF_F<1:0>

High Pass Filter Cutoff Frequency

00

3.5kHz

FS4

HPF_F1

1

01

6.3kHz

1

10

6.3kHz

11

8.9kHz

Table 5. Pattern Select Register

Data Bit

Bit Name

Default Value

Condition

Function

Enables LED drivers to be controlled by audio

0

synchronization

PSO

0

1

0

PS1

0

1

0

PS2

0

1

0

PS3

0

1

0

RESERVED

PS4

RSVD

0

1

RESERVED

Table 6. Current Select Register

Default

Data Bit

Bit Name

Condition

Function

Value

Programs the current drive of the LED1 driver. Current drive for LED1 is set

0

as follows:

CSO

ILED1_0

0

1

ILED1<1:0>

Current Drive Setting

00

0.66X

0

01

1X

CS1

ILED1_1

1

10

1.33X

1

11

2X

Programs the current drive of the LED2 driver. Current drive for LED2 is set

0

as follows:

CS2

ILED2_0

0

1

ILED2<1:0>

Current Drive Setting

00

0.66X

0

01

1X

CS3

ILED2_1

1

10

1.33X

1

11

2X

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