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MBI5368 Dataheets PDF



Part Number MBI5368
Manufacturers Macroblock
Logo Macroblock
Description 8-channel x 3 Constant Current LED Sink Driver
Datasheet MBI5368 DatasheetMBI5368 Datasheet (PDF)

Macroblock Preliminary Datasheet MBI5368 8-channel x 3 Constant Current LED Sink Driver Features z 24 constant-current output channels z Constant output current invariant to load voltage change z 256-step run-time programmable output current gain control z Output current adjusted through three external resistors z Constant output current range: 10 -60 mA z Excellent output current accuracy: between channels: < ±5% (max.), and between ICs: < ±6% (max.) z 25MHz clock frequency z Schmitt trigge.

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Macroblock Preliminary Datasheet MBI5368 8-channel x 3 Constant Current LED Sink Driver Features z 24 constant-current output channels z Constant output current invariant to load voltage change z 256-step run-time programmable output current gain control z Output current adjusted through three external resistors z Constant output current range: 10 -60 mA z Excellent output current accuracy: between channels: < ±5% (max.), and between ICs: < ±6% (max.) z 25MHz clock frequency z Schmitt trigger input z 3.3V / 5V supply voltage z Optional for “Pb-free & Green” Package Low Profile Quad Flat Pack (LQFP) GLQ: 48L (7 x 7 mm2) Current Accuracy Between Channels Between ICs < ±5% < ±6% Conditions IOUT = 10 ~ 60 mA, VDS = 0.8V Product Description MBI5368 is designed for fine pitch LED display applications and exploits PrecisionDrive™ technology to provide uniform and constant current sinks for driving LEDs within a large range of VF variations. In one package, MBI5368 incorporate three 8-channel drivers that output current can be adjusted through three external resistors and moreover be programmable to 256 gain steps for LED white balance MBI5368 provides users with great flexibility and small package while using surface mounted RGB LEDs to display precisely video color. Users may adjust the output current from 10 mA to 60 mA through separately external resistor Rext and 8-bit current gain control, which gives users flexibility in the color correction of LEDs. Macroblock, Inc. 2005 Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC. TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail: [email protected] -1- March 2005, V1.02 MBI5368 8-channel x 3 Constant Current LED Sink Driver Applications Indoor/outdoor LED video display Typical Application Circuit Function Generator 4.5~5.5 V 47u F 20 mA Figure 1 48 47 46 45 44 43 42 41 40 39 38 37 1 36 2 35 3 34 4 33 5 32 6 31 7 30 8 29 9 28 10 27 11 26 12 25 13 14 15 16 17 18 19 20 21 22 23 24 900 ohm Pin Configuration 48 CLK_A 47 SDI_A 46 OUT3_B 45 OUT2_B 44 GND_B 43 OUT1_B 42 OUT0_B 41 LE/MOD/CA_B 40 CLK_B 39 SDI_B 38 OUT3_C 37 OUT2_C LE/MOD/CA_A 1 OUT0_A 2 OUT1_A 3 OUT2_A 4 OUT3_A 5 GND_A 6 VDD_A 7 OUT4_A 8 OUT5_A 9 OUT6_A 10 OUT7_A 11 OE/SW_A 12 Figure 2 SDO_A 13 R-EXT_A 14 OUT4_B 15 OUT5_B 16 OUT6_B 17 OUT7_B 18 OE/SW_B 19 SDO_B 20 R-EXT_B 21 VDD_B 22 OUT4_C 23 OUT5_C 24 36 OUT1_C 35 LE/MOD/CA_C 34 CLK_C 33 SDI_C 32 OUT0_C 31 GND_C 30 VDD_C 29 OUT7_C 28 R-EXT_C 27 SDO_C 26 OE/SW_C 25 OUT6_C -2- March 2005, V1.02 MBI5368 8-channel x 3 Constant Current LED Sink Driver Terminal Description Pin No. 6, 44, 31 Pin Name Function GND_A, GND_B, GND_C Ground terminal for control logic and current sinks 47, 39, 33 SDI_A, SDI_B, SDI_C Serial-data input to the shift register 48, 40, 34 1, 41, 35 CLK_A, CLK_B, CLK_C LE/MOD/CA_A, LE/MOD/CA _B, LE/MOD/CA _C Clock input terminal for data shift on rising edge Output channel data strobe input terminal: in the Normal Mode phase, serial data in the Shift Register is transferred to the respective Output Latch when LE/MOD/CA is high; the data is latched inside the Output Latch when LE/MOD/CA goes low. If the data in the Output Latch is “1” (High), the respective output channel will be enabled after OE /SW is pulled down to low. Mode selection input terminal: in the Mode Switching phase, LE/MOD/CA couldn’t strobe serial data but its level is used for determining the next mode to which MBI5170 is going to switch. When LE/MOD/CA is high, the next mode is the Current Adjust Mode; when low, the next mode is the Normal Mode. Configuration data strobe input terminal: in the Current Adjust Mode phase, serial data is latched into the Configuration Latch, instead of the Output Latch in the Normal Mode. The serial data here is regarded as the Configuration Code, which affect the output current level of all channels. (See Operation Principle) 2-5, 8-11, 15-18, 23-25, 32, 36-38, 42, 43, 45, 46 OUT0 _A ~ OUT7 _A, OUT0 _B ~ OUT7 _B, OUT0 _C ~ OUT7 _C 12, 19, 26 OE /SW_A, OE /SW_B, OE /SW_C Constant current output terminals Output enable terminal: no matter in what phase MBI5368 operates, the signal OE /SW can always enable output drivers to sink current. When its level is (active) low, the output drivers are enabled; when high, all output drivers are turned OFF (blanked). Mode switching trigger terminal: a one-clock-wide short signal pulse of OE /SW could put MBI5368 into the Mode Switching phase. (See Operation Principle) 13, 20, 27 SDO_A, SDO_B, SDO_C Serial-data output to the following SDI of next driver IC 14, 21, 28 R-EXT_A, R-EXT_B, R-EXT_C Input terminal used to connect an external resistor for setting up output current for all output channels 7, 22, 30 VDD_A, VDD_B, VDD_C 3.3V / 5V supply voltage terminal -3- March 2005, V1.02 MBI5368 8-channel x 3 Constant Current LED Sink Driver In MBI5368, the relationship between the functions of pin1, 41, 3.


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