LP5520TL NSC [National Semiconductor], LP5520TL Datasheet - Page 28

• Manufacturer Part Number: LP5520TL
• Description: RGB Backlight LED Driver
• Manufacturer: NSC [National Semiconductor]

www.national.com
REGISTER BIT CONVENTIONS
Each register is shown with a key indicating the accessibility of the each individual bit, and the initial condition:
Register Bit Accessibility and Initial Condition
rgb_control (00H) – RGB LEDs Control Register
current_control_R (01H) – Red LED Current Control Register
seq_mode1
rw-0
7
cc_r[7]
rw-0
7
seq_mode0
rw-0
6
cc_r[7:0]
cc_r[6]
rw-1
seq_mode[1:0]
6
pwm_fast
rgb_auto
en_fade
en_b
en_g
en_r
en_fade
rw-0
Bits 7 - 0
5
cc_r[5]
Key
rw
r
–0, –1
rw-0
5
Bits 6 - 7
pwm_fast
cc_r[7:0]
0000 0000
0000 0001
0000 0010
0000 0011
...
1111 1101
1111 1110
1111 1111
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
cc_r[4]
rw-1
rw-1
4
4
Bit Accessibility
Read/write
Read only
Condition after POR
0 0 – overlapping PWM mode
0 1 – sequential mode with 2 PWM pulses
1 0 – sequential mode with 3 PWM pulses
1 1 – sequential mode with 4 PWM pulses
0 – automatic fade disabled
1 – automatic fade enabled
0 – normal PWM frequency 1.22 kHz
1 – high PWM frequency 19.52 kHz
0 – automatic compensation disabled
1 – automatic compensation enabled
0 – blue LED output B
1 – blue LED output B
0 – green LED output G
1 – green LED output G
0 – red LED output R
1 – red LED output R
28
cc_r[3]
rgb_auto
rw-0
rw-0
3
Adjustment
3
Typical driver current (mA)
0
0.234
0.468
0.702
...
59.202
59.436
59.670
cc_r[2]
OUT
OUT
rw-1
OUT
OUT
2
en_b
OUT
OUT
rw-0
disabled
enabled
2
disabled
enabled
disabled
enabled
cc_r[1]
rw-0
1
en_g
rw-0
1
cc_r[0]
rw-1
0
en_r
rw-0
0