The Specification of APA102 LED CHIP

APA102 LED CHIP 

General Description 

      APA102 is a type ic for the three color RGB Diming control strip and string,This ic 

using the CMOS process to provide three-color RGB LED output driver to adjust the output

with 256 gray scale and 32 brightness adjustment,APA with 2 signal output way , one is 

clock ,another is data, the clock and data is synchronization,
so that the crystal cascade piece of output movement also synchronized.

Feature 

    CMOS process,low voltage ,low consumption 

     Synchronization of two-lane

     Choose positive output or negative RGB 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

PRODUCT  SPECIFICATIONS

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	G	O	Green LED output
14	R	O	Red LED output
15	B	O	Blue 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+0.3	V
VH	Input Low Voltage		VSS-0.3		0.3VDD	V
LOL	Sink Current Voltage(RGB)	VDD=5V,VOL>1V	22.5	24.5	26.5	mA
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 R,G,B 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 MSB←→LSB	Driving Current
00000	0/31
00001	1/31
00010	2/31
·····
11110	30/31
11111	31/31(max)

PWM input and output signals Relations

Data  MSB--	Duty Cycle
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 ,R,G,B for the negative output;POLAR access VSS ,R,G,B is positive output 
(4).VEN: self-detection 
  DATA field to the middle of 3 bit is B,G,R 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.

Application Circuit

You can download the Pdf of APA102 parameter here :

apa102 led chip