LP3958 Datasheet, PDF (19/36 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter

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LP3958
SNVS423C – JANUARY 2006 – REVISED MARCH 2013
WLED Dimming, SLOPE=0
100
FADE OUT
80
FADE IN
60
WLED Dimming, SLOPE=1
100
FADE OUT
80
FADE IN
60
40
40
20
20
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
0
0 0.2 0.4 0.6 0.8 0.1 1.2 1.4
TIME (s)
TIME (s)
Figure 19.
WLED Output Current vs. Voltage
Figure 20.
+25°C
-40°C
+85°C
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
V_DDIO supply domain.
Registers for GPIO are as follows:
Name
EN_PWM_PIN
OEN[2:0]
GPIO CONTROL (06H)
Bit
Description
4
Enable PWM pin
0 = disable
1 = enable
2:0
GPIO pin direction
0 = input
1 = output
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