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LP55271TL 数据表(PDF) 14 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LP55271TL
功能描述  Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
PDF  21 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LP55271TL 数据表(HTML) 14 Page - National Semiconductor (TI)

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Audio Synchronization (Continued)
Audio Input Threshold Setting
Threshold[3:0]
Threshold Level, mV (typical)
0000
Disabled
0001
0.2
0010
0.4
**
**
1110
2.5
1111
2.7
Typical Gain Values vs. Audio Input Amplitude
Audio Input Amplitude mV
P-P
Gain Value dB
0to10
0
0to20
-6
0to40
-12
1to85
-18
3 to 170
-24
5 to 400
-31
10 to 800
-37
20 to 1600
-46
Input Signal Gain Control
GAIN_SEL[2:0]
Gain dB
000
0
001
-6
010
-12
011
-18
100
-24
101
-31
110
-37
111
-46
Refreshing Frequency
SPEED_CTRL[1:0]
Refreshing Rate Hz
00
FASTEST
01
15
10
7.6
11
3.8
Logic Interface Characteristics
Limits in standard typeface are for T
J =25
oC. Limits in boldface type apply over the operating ambient temperature range
(-30oC < T
A < +85
oC). Unless otherwise noted, specifications apply to the LP55271 Block Diagram with: V
IN = 3.6V, CIN =
10 µF, C
OUT1 = 10 µF, COUT2 = 10 µF, CVDDIO = 100 nF, CVREF = 100 nF, CVDDA = 4.7 µF, CVDD1 = 100 nF, CVDD2 = 100
nF, L
1 = 4.7 µH (Note 9)
Symbol
Parameter
Condition
Min
Typical Max
Unit
Logic Inputs SCL and FLASH_SYNC
V
IL
Input Low Level
V
DD_IO = 1.65V to VDD1,2
0.2xV
DD_IO
V
V
IH
Input High Level
0.8xV
DD_IO
V
I
I
Input Current
-1.0
1.0
µA
f
SCL
SCL Pin Clock Frequency
400
kHz
Logic Input NRST
V
IL
Input Low Level
V
DD_IO = 1.65V to VDD1,2
0.5
V
V
IH
Input High Level
1.2
V
I
I
Input Current
-1.0
1.0
µA
t
NRST
Reset Pulse Width
10
µs
Logic Input/Output SDA
V
OL
Output Low Level
I
OUT =3mA
0.3
0.5
V
I
L
Output leakage current
V
OUT = 2.8V
1.0
µA
www.national.com
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