lp5526tlx National Semiconductor Corporation, lp5526tlx Datasheet - Page 22

• Manufacturer Part Number: lp5526tlx
• Description: Lighting Management Unit With High Voltage Boost Converter With Up To 150ma Serial Flash Led Driver
• Manufacturer: National Semiconductor Corporation

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Symbol
LOGIC INPUT SCL, SDA, GPIO[0:2]
V
V
I
f
LOGIC INPUT NRST
V
V
I
t
LOGIC OUTPUT SDA
V
V
I
LOGIC OUTPUT GPIO[0:2]
V
V
I
General Purpose I/O Functionality
LP5526 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
domain.
Registers for GPIO are as follows:
Logic Interface Characteristics
I
SCL
I
NRST
L
L
(V
IL
IH
IL
IH
OL
OH
OL
OH
DDIO
EN_PWM_PIN
OEN[2:0]
= 1.65V...V
Name
Input Low Level
Input High Level
Logic Input Current
Clock Frequency
Input Low Level
Input High Level
Input Current
Reset Pulse Width
Output Low Level
Output High Level
Output Leakage Current
Output Low Level
Output High Level
Output Leakage Current
GPIO CONTROL (06H)
Parameter
DD1,2
unless otherwise noted)
2:0
Bit
4
Enable PWM pin
0 = disable
1 = enable
GPIO pin direction
0 = input
1 = output
I
I
V
I
I
V
SDA
SDA
GPIO
GPIO
Conditions
Description
SDA
GPIO
= 3mA
= -3mA
= 3 mA
= -3 mA
= 2.8V
= 2.8V
DDIO
supply
V
V
0.8xV
22
DDIO
DDIO
−1.0
Min
-1.0
1.2
10
GPIO control register is used to set the direction of each
GPIO pin. For example, by setting OEN0 bit high the
GPIO[0]/PWM pin acts as a logic output pin with data de-
fined DATA0 in GPIO data register. Note, that the EN_PW-
M_PIN bit overrides OEN0 state by forcing GPIO[0]/PWM to
act as PWM input. GPIO[1] and GPIO[2] pins can be se-
lected to be inputs or outputs, defined by OEN1 and OEN2
bit status. PWM functionality is valid only for GPIO[0]/PWM
pin. GPIO data register contains the data of GPIO pins.
When output direction is selected to GPIO pin, then GPIO
data register defines the output pin state. When GPIO data
register is read, it contains the state of the pin despite of the
pin direction.
DDIO
− 0.5
− 0.5
DATA[2:0]
Name
V
V
DDIO
DDIO
GPIO DATA (07H)
Typ
0.3
0.3
− 0.3
− 0.3
Bit
2:0
0.2xV
Max
400
1.0
0.5
1.0
0.5
1.0
0.5
1.0
Data bits
DDIO
Description
Units
kHz
µA
µA
µA
µA
µs
V
V
V
V
V
V
V