General Description
APA102 is atype ic for the three-color White Diming control strip and string ,This ic using the CMOS process to provide three-color White LED output driver to adjust the output with 256 gray scale and 32 brightness adjustment ,APA with 2 signal output way , ther are clock and data. The clock and data is synchronizated ,so that the crystal cascade piece of output movement is sychronizated .
PRODUCT SPECIFICATIONS
Color
|
LM(lumen)
|
Refresh
|
Voltage
|
Power
|
Weigh
|
An
|
Dimens
|
Operating
|
rate
|
Consumpti
|
t
|
gle
|
ions
|
Temperat
| |||
on
|
(g)
|
(mm)
|
ure
| |||||
L*W*H
| ||||||||
White
|
18lm
|
400 cycle
|
DC5V
|
0.2W
|
1
|
16
|
5x5x1.4
|
-40-70℃
|
Warm white
|
(MAX:1W
|
0
| ||||||
Cool white
|
)
|
（PIN Description）
NO.
|
PIN NAME
|
I/O
|
FUNCTION
|
1
|
VDD
|
P
|
Power is terminal
|
2
|
VREG
|
O
|
4.5V regulator output
|
3
|
CKO
|
O
|
Series with the output clock signal
|
4
|
SDO
|
O
|
Series with the output data
|
5
|
VEN
|
I
|
Self-test function selection
|
6
|
CSEL
|
I
|
Invert the clock signal cascade
|
7
|
POLAR
|
I
|
Positive and negative output options
|
8
|
OSCI
|
I
|
Oscillator input
|
9
|
SDI
|
I
|
Series with the input data
|
10
|
CKI
|
I
|
Series with the input clock signal
|
11
|
REXT
|
I
|
Constant current source to adjust side
|
12
|
VSS
|
P
|
Power supply negative terminal
|
13
|
W
|
O
|
W LED output
|
14
|
W
|
O
|
W LED output
|
15
|
W
|
O
|
W LED output
|
(Block diagram)
(Absolute Maximum Rating)
Supply volage --------------
|
-0.3-6.0V
|
Input voltage----------------
|
VSS-0.3 to VDD +0.3V
|
Operating temperature----------------
|
-40 to +70℃
|
Storage temperature-------------------
|
-50 to +125℃
|
Note: Stress above those listed may cause permanent damage to the devices
(Electrical Characteristic)
Symbol
|
Parameter
|
Condition
|
Min.
|
Typ.
|
MAX
|
Units
|
VDD
|
Supply Voltage
|
5.0
|
5.5
|
V
| ||
VIH
|
Input High Voltage
|
0.7VDD
|
VDD
|
V
| ||
+0.3
| ||||||
VH
|
Input Low Voltage
|
VSS-0.3
|
0.3V
|
V
| ||
DD
| ||||||
LOL
|
Sink Current Voltage(RGB)
|
VDD=5V,
|
22.5
|
24.5
|
26.5
|
mA
|
VOL>1V
| ||||||
RIN
|
Pull High
|
VDD=5V
|
570
|
kΩ
| ||
VREG
|
Regulator Voltage(VREG)
|
VDD=5V
|
4.4
|
4.5
|
4.7
|
V
|
FOSC
|
Oscillator Frequency
|
800
|
1200
|
KHz
|
(Function Description)
(1) cascading data structure
Tabdem N-LED
Global bit:5 bit (32 level) brightness setting,while controlling W,W,W three-color constant current output value,if set the global bit for the 10000( 16/31 ) is the output current is half again the original PWM settings
DATA
|
Driving Current
|
MSB←→LSB
| |
00000
|
0/31
|
00001
|
1/31
|
00010
|
2/31
|
·····
| |
11110
|
30/31
|
11111
|
31/31(max)
|
PWM input and output signals Relations
Data
|
Duty Cycle
|
MSB--
| |
00000000
|
0/256(min)
|
00000001
|
1/256
|
00000010
|
2/256
|
········
| |
11111101
|
253/256
|
11111110
|
254/256
|
11111111
|
255/256(max)
|
(2). The number of pixel per second sent to the CKI frequency (FCKI) minus the Start Frame bit divided by the number 40 the number of LED Frame bit 32, if the CKI frequency(FCKI) to 512KHZ. The pixel number (512000-40)/32=15998, if the 50 second update Views can be connected in series LED number 15998/50=319. To increase the number of cascaded IC CKI frequency
(3).POLAR to empty ,W,W,W for the negative output;POLAR access VSS ,W,W,W is positive output
(4).VEN: self-detection
DATA field to the middle of 3 bit is W,W,W in the MSB of the opposite phase,otherwise regarded as invalid data. VEN close to the empty when the self-detection; when VEN VSS then activated self-detection
(5).CSEL to empty when the CKO and CKI,RP:CSEL connected with VSS when the
CKO compared with CKI.
Feature
CMOS process,low voltage ,low consumption Synchronization of two-lane
Choose positive output or negative White three-color LED output 8 bit(256 level) color set ,5bit(32 level) brightness adjustment Build-20ma constant current output
With self-detection signal build in support for continuous oscillation PWM output ,can be maintained static screen
Application
LED lamp
LED Strip ,led pixel module
LED billboard LED screen
