lp55271tlx National Semiconductor Corporation, lp55271tlx Datasheet - Page 14

• Manufacturer Part Number: lp55271tlx
• Description: Tiny Led Driver For Camera Flash And 4 Leds With I2c Programmability, Connectivity Test And Audio Synchronization
• Manufacturer: National Semiconductor Corporation

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Audio Synchronization
Audio Input Threshold Setting
Typical Gain Values vs. Audio Input Amplitude
Logic Interface Characteristics
Limits in standard typeface are for T
(-30
10 µF, C
nF, L
Symbol
Logic Inputs SCL and FLASH_SYNC
V
V
I
f
Logic Input NRST
V
V
I
t
Logic Input/Output SDA
V
I
I
SCL
I
NRST
L
IL
IH
IL
IH
OL
Threshold[3:0]
Audio Input Amplitude mV
o
C
1
= 4.7 µH (Note 9)
<
0000
0001
0010
1110
1111
OUT1
*
*
T
A
20 to 1600
<
Parameter
Input Low Level
Input High Level
Input Current
SCL Pin Clock Frequency
Input Low Level
Input High Level
Input Current
Reset Pulse Width
Output Low Level
Output leakage current
10 to 800
3 to 170
5 to 400
= 10 µF, C
0 to 10
0 to 20
0 to 40
1 to 85
+85
o
C). Unless otherwise noted, specifications apply to the LP55271 Block Diagram with: V
Threshold Level, mV (typical)
OUT2
= 10 µF, C
P-P
Disabled
J
= 25
0.2
0.4
2.5
2.7
*
*
(Continued)
Gain Value dB
Condition
V
V
I
V
VDDIO
OUT
DD_IO
DD_IO
OUT
o
C. Limits in boldface type apply over the operating ambient temperature range
= 3 mA
-12
-18
-24
-31
-37
-46
= 2.8V
-6
0
= 100 nF, C
= 1.65V to V
= 1.65V to V
VREF
DD1,2
DD1,2
14
= 100 nF, C
Input Signal Gain Control
Refreshing Frequency
SPEED_CTRL[1:0]
GAIN_SEL[2:0]
VDDA
Min
0.8 x V
00
01
10
11
000
001
010
011
100
101
110
111
= 4.7 µF, C
-1.0
-1.0
1.2
10
DD_IO
Typical Max
VDD1
400
0.3
Refreshing Rate Hz
= 100 nF, C
0.2 x V
FASTEST
IN
1.0
0.5
1.0
0.5
1.0
Gain dB
7.6
3.8
15
= 3.6V, C
DD_IO
-12
-18
-24
-31
-37
-46
-6
0
VDD2
Unit
= 100
kHz
IN
µA
µA
µA
µs
V
V
V
V
V
=