LP3954 Datasheet, PDF (32/60 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
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BATTERY
4.7 H
C_IN
10 F
C_VDD
100 nF
2.8V
C_VDDA
1 PF
V_DD1
V_DD2
V_DDA
LDO
Digital
supply
voltage
Analog
supply
voltage
SW
LP3954
Logic Interface Characteristics
(1.65V ≤ V_DDIO ≤ V_DD1,2V) (Unless otherwise noted)
Parameter
Test Conditions
LOGIC INPUTS SS, SI, SCK/SCL, SYNC/PWM, IF_SEL, EN_FLASH
V_IL
Input Low Level
V_IH
Input High Level
I_I
Logic Input Current
f_SCL
Clock Frequency
LOGIC OUTPUT SO
V_OL
Output Low Level
V_OH
Output High Level
I_L
Output Leakage Current
LOGIC OUTPUT SDA
V_OL
Output Low Level
I²C Mode
SPI Mode,
V_DDIO > 1.8V
SPI Mode,
1.65V ≤ V_DDIO < 1.8V
I_SO = 3 mA
V_DDIO > 1.8V
I_SO = 2 mA
1.65V ≤ V_DDIO < 1.8V
I_SO = −3 mA
V_DDIO > 1.8V
I_SO = -2 mA
1.65V ≤ V_DDIO < 1.8V
V_SO = 2.8V
I_SDA = 3 mA
Min
Typ
0.8 ×
V_DDIO
−1.0
V_DDIO −
0.5
V_DDIO −
0.5
0.3
0.3
V_DDIO −
0.3
V_DDIO −
0.3
0.3
Control Interface
The LP3954 supports two different interface modes:
• SPI interface (4 wire, serial)
• I²C compatible interface (2 wire, serial)
User can define the serial interface by IF_SEL pin. IF_SEL=0 selects the I²C mode.
Max
0.2 ×
V_DDIO
1.0
400
13
5
0.5
0.5
1.0
0.5
Unit
V
V
µA
kHz
MHz
MHz
V
V
µA
V
32
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