LP3952RLSLASHNOPB datasheet(22/46 Pages) TI1

22 / 46 page

5.00

0.05

GAIN (dB)

0.10

0.15

0.20

0.25

0.30

0.50

1.00

1.50

2.00

2.50

3.00

LP3952

SNVS518A – JULY 2007 – REVISED MARCH 2013

www.ti.com

Peak Input Signal Level

Range vs Gain Setting

RGB LED Blinking Control (1.65V

≤ V

DDIO ≤ VDD1,2V) (unless otherwise noted)

LP3952 has a possibility to drive indicator LEDs with RGB1 outputs with programmable blinking time. Blinking

function is enabled with RGB_SEL[1:0] bits set as 01b in 0BH register. R1_CYCLE_EN, G1_CYCLE_EN and

B1_CYCLE_EN bits in cycle registers (02H, 04H and 06H) enable/disable blinking function for corresponding

output. When EN_BLINK bit is written high in register 11H, the blinking sequences for all outputs (which has

CYCLE_EN bit enabled) starts simultaneously. EN_BLINK bit should be written high after selecting wanted

blinking sequences and enabling CYCLE_EN bits, to synchronize outputs to get desired lighting effect. R1SW,

G1SW and B1SW bits can be used to enable and disable outputs when wanted.

RGB1 blinking sequence is set with R1, G1 and B1 blink registers (01H, 03H and 05H) by setting the appropriate

OFF-ON times. Blinking cycle times are set with R1_CYCLE[2:0], G1_CYCLE[2:0] and B1_CYCLE[2:0] bits in

R1, G1 and B1 CYCLE registers (02H, 04H and 06H). OFF/ON time is a percentage of the selected cycle time.

Values for setting OFF/ON time can be seen in following table.

Table 2. R1, G1 and B1 Blink Registers (01H, 03H and 05H):(1.65V

≤ VDDIO ≤ VDD1,2V) (unless otherwise

noted)

Name

Bit

Description

R1_ON[3:0], R1_OFF[3:0]

7-4, 3-0

RGB1 ON and OFF time

G1_ON[3:0], G1_OFF[3:0]

Bits

ON/OFF time

B1_ON[3:0], B1_OFF[3:0]

0000

0001

0010

2.5%

0011

0100

7.5%

0101

10%

0110

15%

0111

20%

1000

30%

1001

40%

1010

50%

1011

60%

1100

70%

1101

80%

1110

90%

1111

100%

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