16-Bit LED Driver CS8816 Revision History Rev. No. History Issue Date 1.0 New issue Sep. 26, 2008 1.1 Add new package type Dec. 23, 2008 Update AC data Modify Rext vs. Iout relation 1.2 Add new package type Apr. 6, 2009 1.3 Add new package type Oct. 5, 2009 Modify Rext vs. Iout formula 1.4 Updated thermal resistance and power dissipation Feb. 3, 2010 1.5 Format modify Oct. 19, 2010 1 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 CS8816(AF/AN/CP/AM/AN-1) 16-Bit Constant Current LED Driver with 3.0V to 5.5V Supply Voltage Description The CS8816 is a 16-Bit constant current LED driver IC which is designed for LED displays. The output current can be adjusted by using an external resistor. All outputs will have the same current drive level which is crucial in LED display application. This driver has built-in 16-bit constant current outputs, a 16-bit shift register, and a 16-bit latch circuit. These drivers have been designed by using CMOS process. Feature Output current capability: 70mA each output Constant current range: 5mA to 70mA For common anode LED application Power supply voltage range VDD=3.0V to 5.5V Maximum output drain voltage 7.0V Serial data transfer rate: 25MHz(Cascade Connection) Operating temperature range: -40 to 85 degree C Output current accuracy: Between Bits : < +-1.5 % Between ICs: < +-4 % Product Family CS8816AF ------- 24SSOP(236mil, 1.0mm lead-pitch) CS8816AN ------- 24SSOP(150mil, 0.64mm lead-pitch) CS8816CP ------- 24Shrink PDIP(300mil, 1.78mm lead-pitch) CS8816AM ------- 24SOP(300mil, 1.27mm lead-pitch) CS8816AN-1 ------- 24SSOP(150mil, 0.64mm lead-pitch) 2 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 Pin Assignment AF/AN/CP/AM Block Diagram Truth Table AN-1 CLOCK LATCH ENABLE SERIAL-IN OUT0---OUT7---OUT15 SERIAL-OUT Positive edge H L Dn /Dn---/Dn-7---/Dn-15 Dn-15 Positive edge L L Dn+1 No Change Dn-14 Positive edge H L Dn+2 /Dn+2---/Dn-5---/Dn-13 Dn-13 Negative edge X L Dn+3 /Dn+2---/Dn-5---/Dn-13 Dn-13 Negative edge X H Dn+3 Off Dn-13 3 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 Timing Diagram Note: 1. The latch circuit is a level-latch, not an edge-triggered latch. 2. The latch circuit holds data when LATCH pin low. When the LATCH pin is at high-level, the latch circuit passes the data from input to output. When ENABLE pin is at low-level, the latch is data transferred to the output pin OUT0~OUT15. When ENABLE pin is at high-level, the OUT0~OUT15 is turned off regardless of the latch data. 4 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 Pin Description Pin No. Pin Name Function 1 GND 2 SERIAL-IN 3 CLOCK Clock input terminal for shift register, rising edge trigger. 4 LATCH Data latch input pin. When LATCH=High-level, data is passed to GND Pin. Serial input data pin. OUT0~OUT15, when LATCH=Low-level, data is latched. 5~20 OUT0~OUT15 21 ENABLE 16 constant current output pin to drive common anode LEDs. Data output enable pin, when ENABLE=High-level, all OUT0~OUT15 are turned off, and when ENABLE=Low-level, all OUT0~OUT15 are enabled. 22 SERIAL-OUT 23 R-EXT 24 VDD Serial data output pin for cascade operation. The external resistor connection pin to adjust the output current. 3.0V~5.5V supply voltage pin. Equivalent Circuits of I/O Pins 5 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 Absolute Maximum Ratings Characteristics Symbol Supply Voltage Rating VDD Unit +7.0 V V Input Voltage Vin -0.4 to VDD+0.4 Output Current Iout +70 Output Voltage Vout -0.5 to 7.0 GND Pin Current IGND 1120 mA Clock Frequency fCLK 25 MHz Power Dissipation (On PCB, Ta=45C) Pd Thermal Resistance (On PCB, Ta=45C) Rth(j-a) mA V AF: 2.36 AN: 1.94 CP: 1.91 AM: 1.76 AF: 44.4 AN: 54.25 CP: 55.07 AM: 59.6 W /W Operating Temperature Top -40 to 85 Storage Temperature Tstg -55 to 150 Recommended Operating Condition Characteristics Symbol Min Typ Max Unit 3.0 5.0 5.5 V 7.0 V OUTn 70 mA IOL SERIAL-OUT Vol=0.5V 2.5 IOH SERIAL-OUT Voh=4.3V -2.0 Supply Voltage VDD Output Voltage VOUT Output Current IOUT Input Voltage Clock Frequency Condition VIH 0.7VDD VDD+0.3 VIL -0.3 0.3VDD fCLK VDD=5.0V, Cascade connection 25 VDD=3.0V, Cascade connection 20 V MHz Latch Pulse Width twLatch VDD=4.5V ~ 5.5V 15 ns Clock Pulse Width twCLOCK VDD=4.5V ~ 5.5V 15 ns Set-Up Time for Data tSETUP3 VDD=4.5V ~ 5.5V 20 ns Set-Up Time for Latch tSETUP2 VDD=4.5V ~ 5.5V 15 ns Set-Up Time for Clock tSETUP1 VDD=4.5V ~ 5.5V 20 ns tHOLD VDD=4.5V ~ 5.5V 20 ns Hold Time for Data 6 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 Electrical Characteristics (Temp=25) Characteristics Symbol Condition Min Typ Max Unit 3.0 5.0 5.5 V Supply Voltage VDD Output Current IOUT1 VOUT=1.0V, VDD=5.0V, 24.6 IOUT2 R-EXT=700Ohm 5.0 mA VOUT=1.0V, VDD=5.0V, R-EXT=3450Ohm Output Current Error IOUT1 VOUT=1.0V, R-EXT=700Ohm -1.5 +1.5 Between Bits IOUT2 VOUT=1.0V, R-EXT=3450Ohm -1.5 +1.5 Output Current Error ILO3 VOUT=1.0V, R-EXT=700Ohm -4 +4 Between Chips IOL4 VOUT=1.0V, R-EXT=3450Ohm -4 +4 Output Leakage ILEAK VOUT=5.0V % % 1 uA Current Input Voltage Low VIL VDD=5.0V 0 1.5 V Input Voltage High VIH VDD=5.0V 3.5 5.0 V Output Voltage SOUT VOL IOL=+1.5mA, VDD=5.0V 0.5 V VOH IOH=-1.5mA, VDD=5.0V ENABLE Pin 202 KOhm LATCH Pin 128 KOhm Pull-Up Resistor R(UP) Pull-Down Resistor R(DOWN) Supply Current(Off) IDD(Off) (OUT0~OUT15 Off) Supply Current(On) (OUT0~OUT15 On) IDD(On) 4.3 VDD=5.0V, R-EXT=700Ohm 3.7 VDD=5.0V, R-EXT=3450Ohm 0.9 VDD=5.0V, R-EXT=Open 0.2 VDD=5.0V, R-EXT=700Ohm 3.7 VDD=5.0V, R-EXT=3450Ohm 0.9 7 Chiplus reserves the right to change product or specification without notice. mA mA Rev. 1.5 16-Bit LED Driver CS8816 Switching Characteristics (Temp=25, VDD=5V, VIH=3.5V, VIL=0V, R-EXT=860Ohm) Characteristics Propagation Delay Pulse Width Symbol Condition Min Typ Max Unit tpLH1 CLK-OUTn, LATCH="H", ENABLE="L" 40 60 ns tpLH2 LATCH-OUTn, ENABLE="L" 35 50 ns tpLH3 ENABLE-OUTn, LATCH="H" 20 30 ns tpLH CLK-SERIAL OUT 30 40 ns tpHL1 CLK-OUTn, LATCH="H", ENABLE="L" 80 125 ns tpHL2 LATCH-OUTn, ENABLE="L" 75 120 ns tpHL3 ENABLE-OUTn, LATCH="H" 130 180 ns tpHL CLK-SERIAL OUT 30 40 ns tW(CLOCK) CLOCK 15 ns tW(LATCH) LATCH 10 ns ENABLE 180 ns tW(ENABLE) Output Rise Time tor Voltage waveform 10%~90% 30 75 150 ns Output Fall Time tof Voltage waveform 90%~10% 10 20 40 ns Max CLK Rise Time tr 480 ns Max CLK Fall Time tf 480 ns Test Circuit (RL=162Ohm, CL=10pf, VL=5.0V) 8 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 Timing Waveform 9 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 Output Current vs. R-EXT (VDD=5V) Iout = (1.22/Rext) x 14.62 CS8816 Rext vs. Iout Curve Iout (mA) 90 80 70 60 50 40 30 20 10 0 0 1000 2000 3000 4000 5000 6000 Rext (ohm) CS8816 Vds vs. Iout Curve 80 Iout(mA) 70 60 50 40 30 20 10 1155ohm 691ohm 345ohm 247ohm 0 0 0.5 1 1.5 2 2.5 3 3.5 Vds 10 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 Typical Application LED supply voltage is set-up by following equation: VLED = VCE + Vf + Vo To prevent too much power dissipated by driver due to the higher VLED, an additional R can be introduced to reduce the Vo when output is consuming current. R = ( VLED - VCE - Vf - Vo min)/( Io max * Bit max) Order Information Part No. Package Type Lead Pitch CS8816AF 24SSOP(236mil) 1.0mm CS8816AN 24SSOP(150mil) 0.64mm CS8816CP 24Shrink PDIP(300mil) 1.78mm CS8816AM 24SOP(300mil) 1.27mm CS8816AN-1 24SSOP(150mil) 0.64mm 11 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 12 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 13 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 14 Chiplus reserves the right to change product or specification without notice. Rev. 1.5 16-Bit LED Driver CS8816 15 Chiplus reserves the right to change product or specification without notice. Rev. 1.5