+85°C

-40°C

+25°C

100

0

TIME (s)

0

0.7

0.1

0.2

0.3

0.4

0.5

0.6

80

60

40

20

FADE OUT

FADE IN

100

0

TIME (s)

0

1.4

0.2

0.4

0.6

0.8

0.1

1.2

80

60

40

20

FADE OUT

FADE IN

LP3958

www.ti.com

SNVS423C – JANUARY 2006 – REVISED MARCH 2013

WLED Dimming, SLOPE=0

WLED Dimming, SLOPE=1

Figure 19.

Figure 20.

WLED Output Current vs. Voltage

Figure 21.

General Purpose I/O Functionality

LP3958 has three general purpose I/O pins: GPIO[0]/PWM, GPIO[1] and GPIO[2]. GPIO[0]/PWM can also be

used as a PWM input for the external LED PWM controlling. GPIO bi-directional drivers are operating from the

VDDIO supply domain.

Registers for GPIO are as follows:

GPIO CONTROL (06H)

Name

Bit

Description

EN_PWM_PIN

4

Enable PWM pin

0 = disable

1 = enable

OEN[2:0]

2:0

GPIO pin direction

0 = input

1 = output

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Product Folder Links: LP3958