• [ CXLE88178 ]"

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CXLE88178 line scan driver chip data manual details.4kU嘉泰姆

1. Product Overview

CXLE88178 is a highly integrated line scan driver chip designed for LED scanning display, with 8-channel PMOS output, 138 decoding circuit and multiple protection functions. The chip is packaged in SOP16 and integrates advanced features such as anti-burn power tube, ghost elimination, LED lamp bead protection, etc., which can effectively improve the reliability of LED display screen and simplify PCB design.4kU嘉泰姆

2. core features

2.1. High integration design

The 138 decoding circuit and 8 power PMOS output transistors are integrated inside the chip, the on-resistance is as low as 100mΩ, and the maximum driving current is 2.5A. This highly integrated design significantly simplifies the PCB layout and routing complexity of the LED module.4kU嘉泰姆

2.2. Multiple protection mechanisms

2.2.1) Anti-burn power tube: Built-in protection circuit to prevent the power tube from being damaged by overcurrent4kU嘉泰姆

2.2.2)Ghost: Effectively eliminate the common power-on ghost phenomenon of LED display4kU嘉泰姆

2.2.3)Anti-LED reverse breakdown: Integrated voltage regulator circuit to protect LED lamp beads from reverse voltage impact4kU嘉泰姆

2.2.4)anti-caterpillar phenomenon: Improve the display abnormality caused by short circuit of LED lamp beads4kU嘉泰姆

2.3. Excellent power consumption performance

Under the condition of VDD = 5V, the maximum power consumption of the chip is less than 650mW, and the typical quiescent current is only 0.4mA, which is suitable for high-density LED display applications.4kU嘉泰姆

2.4. Compact package

It is packaged in SOP16 with a size of 10.00mm × 4.00mm, which is convenient for layout in LED modules with limited space.4kU嘉泰姆

3. Application Areas

CXLE88178 is widely used in:4kU嘉泰姆

•  LED display line scan driver4kU嘉泰姆

•  LED lighting control system4kU嘉泰姆

•  LED landscape lighting engineering4kU嘉泰姆

•   Indoor and outdoor full color LED display4kU嘉泰姆

4. pin function details

4.1. Power and Grounding

•  VDD (pins 1, 9): Chip power input, working voltage range 3.0V-5.5V4kU嘉泰姆

•  GND (pin 8): Chip ground terminal4kU嘉泰姆

4.2. Control signal

•A0-A2 (Pins 15, 16, 2): 138 decoder address input4kU嘉泰姆

•E1, E2 (pins 7, 10): enable control terminal, high level is valid4kU嘉泰姆

4.3. Drive output

• OUT0-OUT7 (Pins 3-6, 11-14)8 PMOS driver output, can directly drive the LED line4kU嘉泰姆

4.4. Precautions: All control pins (A0-A2, E1, E2) must not be suspended and must be connected to high or low level to prevent electrostatic damage.4kU嘉泰姆

5. Limit Parameters and Electrical Characteristics

5.1. Limit parameters

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(1) These levels in the above table, the chip may cause permanent damage to the device and reduce the reliability of the device under long-term use conditions.4kU嘉泰姆
We do not recommend that the chip work beyond these limit parameters under any other conditions;4kU嘉泰姆
(2) All voltage values are tested relative to the system ground.

•  Logic supply voltage:-0.5V ~ 7.0V4kU嘉泰姆

•  Logic input voltage:-0.5V ~ VDD 0.6V4kU嘉泰姆

•  Maximum power consumption: 650mW4kU嘉泰姆

•  Operating temperature range:-40 ℃ ~ 85 ℃4kU嘉泰姆

5.2. DC characteristics

•  Working voltage: 3.0V ~ 5.5V4kU嘉泰姆

•  Quiescent current: 0.4mA (typical)4kU嘉泰姆

•  Output drive current: Maximum 2.5A(VDD = 5V)4kU嘉泰姆

•  PMOS ON-resistance: 100mΩ (typical)4kU嘉泰姆

5.3. Exchange characteristics

•  Output rise delay: 50ns (typical)4kU嘉泰姆

•  Output Drop Delay: 300ns (typical)4kU嘉泰姆

•  Output rising edge: 50ns4kU嘉泰姆

•   Output falling edge: 200ns4kU嘉泰姆

6. Control Logic and Data Protocol

The chip uses standard 138 decoding logic to control the gating of 8 outputs through A0-A2 address lines and E1 and E2 enable terminals. The truth table clearly shows the correspondence between each input state and the output channel, which is convenient for logical planning during system design.4kU嘉泰姆

6.1. Data protocol, truth table.4kU嘉泰姆
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Remarks: 1) Input parts E1,E2,A0,A1,A2 are prohibited from floating, and high or low potential needs to be set.4kU嘉泰姆
2) The H of the input part represents the high level, and the L represents the low level.4kU嘉泰姆
3) The H of the output part represents on, and L represents off.4kU嘉泰姆

7. Typical Application Scheme

7.1. 8 Sweep LED Display Application

In a typical 8-scan LED display screen, a piece of CXLE88178 can drive 8 rows of LEDs, receive row selection signals from the controller through A0-A2 address lines, and OUT0-OUT7 connect to corresponding row lines respectively.4kU嘉泰姆
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7.2. 16-scan LED display application

For the 16-sweep system, it can be realized by two-piece CXLE88178 cascade. The first piece of driving ROW0-ROW7, the second piece of driving ROW8-ROW15, through E1, E2 enable terminal distinction chip gate.4kU嘉泰姆
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Key Points and Suggestions of 8. Design

8.1.PCB Layout Recommendations

•  Adequate decoupling capacitors should be placed near the power supply pins4kU嘉泰姆

•  Output traces should be wide enough to withstand large currents4kU嘉泰姆

•  The control signal line should be far away from the high frequency interference source4kU嘉泰姆

8.2. Thermal management considerations

Although the power consumption of the chip is low, the heat dissipation problem still needs to be considered in high brightness and high scanning frequency applications. It is recommended to reserve heat dissipation vias at the bottom of the chip.4kU嘉泰姆

8.3. System protection design

•   It is recommended to connect the safety resistor in series at the VDD input4kU嘉泰姆

•   The output can be considered to add transient voltage suppression devices4kU嘉泰姆

•    The control signal line can be connected in series with a small resistor to suppress ringing4kU嘉泰姆

9. Encapsulation Information

The CXLE88178 uses standard SOP16 package, the specific size is as follows:4kU嘉泰姆

•  Total length: 9.90 mm-10.00mm4kU嘉泰姆

•  Colloid width: 3.90 mm-4.00mm4kU嘉泰姆

•  Pin pitch: 1.27mm (standard)4kU嘉泰姆

•  Colloid thickness: 1.25 mm-1.55mm4kU嘉泰姆

10. epilogue

As a line scan driver chip designed for LED scanning screen, CXLE88178 has become an ideal choice for LED display system with its high integration, multiple protection functions and excellent driving performance. Whether it is a traditional monochrome display or a high-end full-color display, CXLE88178 can provide a stable and reliable line scanning solution.4kU嘉泰姆

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10. Related Chip Selection GuideMore similar products.....4kU嘉泰姆

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