Ver 1.0 RGB/Matrix/Audio EQ/16Level LED Driver

Transcription

1 RGB/Matrix/Audio EQ/16Level LED Driver Description BCT3286 is a LED matrix driver with SPI control interface, which features with Mono or RGB LED dot matrix display and audio frequency equalizer (EQ) to produce amazing visual effects. It has the function of mono LED/ RGB LED blinking, breathing, single shift or rotate shift, music equalizer, etc, realized by only one single instruction, thus save MCU software resources. It has less than 2uA shut down current and save battery life. BCT3286 is available in QFN-28(4mm 4mm). It operates from 2.7V to 5.5V over the temperature range of of -40 C to +85 C Applications Mobile phones and other hand-held devices for LED displays. Audio frequency equalizer display Toys or home appliance devices Features Programmable 10 10, 11 9, 12 8 matrix LED driver Each column has 16 brightness level programmable by SPI interface. Max 40mA current for each row and can be changed by external Rext RGB numbers can be 4n ( n= 1,..8), thus support max 32 RGB LEDs 16 colures can be selected in RGB mode. Audio frequency EQ display of 8 column, and sync with music Audio input gain can be programmable or automatic control. Auto blink or breath functions, and brightness level and frequency can be programmed. Internal RAM Single shift or rotate shift, direction and speed can be selected Pin Configuration (Top View) 1

2 Ordering Information Order Number Package Type Operating Temperature Range Marking QTY/Reel BCT3286EGI-TR QFN C to +85 C Pin Description No. Pin Description 1 SCLK SPI CLK 2 CS SPI CS 3 DIN SPI DATA 4 SDB Reset 5 AU-IN Audio input. 6 REXT current setting 7 R1 Constant current row output1 8 R2 Constant current row output2 9 R3 Constant current row output3 10 R4 Constant current row output4 11 R5 Constant current row output5 12 R6 Constant current row output6 13 R7 Constant current row output7 14 R8 Constant current row output8 15 R9 Constant current row output9 16 R10 Constant current row output10 17 R11/C10 Constant current row output11 or column10 Scan output 18 R12/C9 Constant current row output12 or column9 Scan output 19 C8 column8 Scan output 20 C7 column7 Scan output 21 VDD Power supply. 22 C6 column6 Scan output 23 C5 column5 Scan output 24 C4 column4 Scan output 25 C3 column3 Scan output 26 C2 column2 Scan output 27 C1 column1 Scan output 28 NC 29 GND Ground. 2

3 Absolute Maximum Ratings Supply voltage, VDD V ~ +5.5V Outx current, IO mA Voltage at any input pin VI V ~ VDD+0.3V Working temperature, TA C to +150 C Junction temperature, TJMAX C Storage temperature, Tstg C to +150 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics Test condition : Vin = 2.7V ~ 5.5V, TA = 25 C, unless otherwise noted. Parameter Symbol Condition Min. Typ. Max. Unit Supply voltage VDD V Quiescent current IVDD REXT=4K,R1~ R12 Open,VDD=5.5V ma Shutdown current ISHUT Shutdown mode,vdd=5.5v 2 ua Output current accuracy Output current match IO Dropout Voltage Vdrop REXT=2K,Vdropout=1V ma REXT=4K,Vdropout=1V REXT=2K,Vdropout=1VIO=40mA ±1 ±3 % REXT=4K,Vdropout=1V,IO=20mA ±1 ±3 VDD=3.3V,IO=40mA mv VDD=3.3V,IO=20mA Logic H input voltage VIH 1.5 V Logic L input voltage VIL 0.8 V Serial (SPI) interface Serial (SPI) interface is for receiving the control signals sent from controller, then decode the received command and send it to the corresponding register and control module. It has three pin: CS, SCLK and DIN. Pin Name Attribute Direction Description SPICK Rising edge MCU->BCT3286 Serial bus clock SPIDATA Level MCU->BCT3286 Serial data SPICS Active Low MCU->BCT3286 SPI bus chipselection Serial (SPI) interface can only do write operation form MCU to BCT3286, it is not readable. The fixed data width is 16 bits 3

4 Figure 2 shows the timing diagram of this serial interface. When no data transmit, SPICK is forced to LOW and SPICS is forced to HIGH. Once the data need to be send form controller to BCT3286, SPICS is pulled LOW to enable the transmission. At rising edge of the CLK, data is latched. SPICS keep LOW for the duration of the transmission. First 8 bits of DIN will be the register address and following 8 bits will be the data of the register. Serial Port Interface Timing Figure 2: SPI timing Figure 3. SPI Interface Timing Diagram Symbol Parameter Min Tye Max Unit Ts SPIDATA to SPICK setup time 4 ns Th SPIDATA to SPICK hold time 20 ns The maximum output current per row is set by a single external resistor REXT, which is between the REXT pin and GND pin. The maximum channel output current can be calculated as: IO(max) = 80 /Rext (ma) The max output current REXT values REXT(K Ω) IOmax(mA) If N column are used, the Max current for each LED is IO(max)/N. 4

5 Registers Definition 1. Data register 00H Column 1 data register 01H Column 1 data and brightness register 02H Column 2 data register 03H Column 2 data and brightness register 04H Column 3 data register 5

6 05H Column 3 data and brightness register 06H Column 4 data register 07H Column 4 data and brightness register 08H Column 5 data register 09H Column 5 data and brightness register 0AH Column 6 data register 6

7 0BH Column 6 data and brightness register 0CH Column 7 data register 0DH Column 7 data and brightness register 0EH Column 8 data register 0FH Column 8 data and brightness register 10H Column 9 data register 7

8 11H Column 9 data and brightness register 12H Column 10 data register 13H Column 10 data and brightness register In RGB mode, also take 00H and 01H as example, every column has 12 row, every three row for one RGB LED. The row 12 to row 10 connect RGB4 G, B, R pin respectively, the row 9 to row 7 connect RGB3, the row 6 to row 4 connect RGB2, and the row 3 to row 1 connect RGB1 The 8 bits of 00H represent the RGB4 and RGB3 color, and 8 bits of 01H represent the RGB2 and RGB1 color. The color are following red 1000 Sky Blue 0001 orange 1001 Lake Blue 0010 taupe 1010 Deep blue 0011 yellow 1011 Shallow violet 0100 Shallow green 1100 purple 0101 green 1101 amaranthine 0110 blue green 1110 pink 0111 Shallow blue 1111 Don't light Note: the colure is based on AOT RGB LED, AOT-1615RGB43A-Z0-N-3-M 8

9 2. Control register 14H Mode Control register Bit D7:D6 D5:D4 D3:D1 D0 Name Rsv Array mode[1:0] Ctr-mode[2:0] Shutdown Default Array mode[1:0] Row x column 00 or 11 12x x x10 Ctr-mode[2:0] 000 normal 001 blinking 010 breathing 011 rotate shift 100 single shift 101 reserves 110 Music equalizer 111 RGB mode Shutdown 0 No Shutdown 1 Shutdown 15H Frequency control register Bit D7 D6:D0 Name Move direction Speed ctrl Default Move direction For shift function 0 Move direction from column 1 to 10 1 Move direction from column 10 to 1 Speed ctrl For Blinking, breath, shift mode frequency, N = 0 127, then frequency F = 100/(n+1)Hz 9

10 16H RGB control register Bit D5:D2 D1:D0 Name RGB select[3:0] RGB bright[1:0] Default RGB select[3:0] 0000 NO RGB 0001 First Column for RGB( Total 4 RGB) 0010 First to 2nd Column for RGB( Total 8 RGB) 0111 First to 7th Column for RGB( Total 28 RGB) 1000 First to 8th Column for RGB( Total 32 RGB) RGB bright[1:0] 00 Brigtness level 4, most brigtness 01 Brigtness level 3 10 Brigtness level 2 11 Brigtness level 1, less brigtness 17H AGC control register Bit D3 D2:D0 Name AGC enable Audio Gain adjust[2:0] Default AGC enable For Auto audio input gain adjust 0 No auto, gain is decided by bits [2:0] 1 Gain is adjust automatically, not by bits [2:0] Audio Gain adjust 000 0db db db db db db db 111-6db 10

11 Function diagram Figure 4: Function diagram Functional description First need to select the mode in 14H mode control register, Ctr-mode[2:0] 000 normal, LEDs in matrix will be ON or Off according to the setting of register 00H and 13H. If ON, the brightness level is selected by register 00H and 13H. 001 blinking LEDs in matrix will be blinking according to the setting of 00H and 13H, the brightness level is selected by register 00H and 13H and the blinking frequency can be set by the D6 to D0 in register 15H. 010 breathing LEDs in matrix will breath according to the setting of 00H and 13H, breath means that the LED will light up and light down in gradual, the most brightness level of light up is selected by register 00H and 13H and the breathing frequency can be set by the D6 to D0 in register 15H. 011 rotate shift LEDs in matrix will be ON or Off according to the setting of 00H and 13H, the brightness level is selected by register 00H and 13H. All the Column of LEDs will shift to next column, and the direction is determined by frequency control register D7. The shift frequency can be set by the D6 to D0 in register 15H. Rotate shift means, the most left column will shift back into the most right column, or vice versa. 100 single shift Same as the rotate shift, but the most left/right column LED will not shift back. 11

12 101 reserves 110 Music equalizer In the audio EQ mode, the column 1 to 8 represents the frequency bands while the row 1 to 8 represents the strength of the input audio signal in each band. So, LEDs in column 1 to 8 and row 1 to 8 will not be controlled by register 00H and 13H setting. The number of LEDs lit in a column is proportional to the strength of the audio signal in the corresponding audio frequency band, Other LEDs will still control by register 00H and 13H setting. 111 RGB mode In this mode matrix mode is fixed is 12 x8, and D5, D4 setting in register 14 H won't affect it. Then, select the RGB LED numbers and columns in register 16H D5 to D2 Note : For RGB connection, Please refer to the table 1, otherwise RGB color scheme will be invalid RGB Pin R G B Row row1 row4 row7 row10 row2 row5 row8 row11 row3 row6 row9 row12 Table 1, RGB connection Typical application 1, Mono LED matrix Figure 4: Typical application 1, Mono LED matrix 12

13 Typical application 2, REB LED matrix Figure 4: Typical application 2, REB LED matrix Typical application 3, REB and mono LED mix Figure 4: Typical application 3, REB and mono LED mix 13

14 Package Information 14