Introduction to UCS1903 chip
Introduction to UCS1903 chip
Product overview:
Main feature:
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1. Output port voltage 15V;
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2. The chip has a built-in voltage regulator, and the power end needs to string resistance to the IC VDD pin, without the need to add a voltage regulator tube brightness adjustment circuit (256 brightness can be adjusted);
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3. Built-in double RC oscillation, and clock synchronization according to the signal on the data line, after receiving the data of this unit, the subsequent data can be automatically reshaped and forwarded;
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4. Built-in power-on reset circuit;
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5.PWM control terminal can achieve 256 level adjustment, scanning frequency is not less than 400Hz/S;
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6. Serial interface cascade port, through a signal line to complete the reception and decoding of data
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7. When linear transmission, unlimited cascade;
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8. The transmission distance of any two points exceeds 10 meters without adding any circuit;
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9. When the refresh rate is 30 frames/SEC, the number of cascades in low-speed mode is not less than 512 points, and that in high-speed mode is not less than 1024 points
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10. The data transmission speed can reach 400Kbps and 800Kbps two modes
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11. Using preset constant current mode, and according to the principle of weak red light luminous intensity, the current of OUTR output is slightly greater than OUTG and OUTB, and the white light effect is better.
Outlet arrangement:
Outlet function:
| Serial number | symbol | Pin name | Function description |
| 1 | OUTR | LED driver output | Red PWM control output |
| 2 | OUTG | LED driver output | GreenPWM control output |
| 3 | OUTB | LED driver output | Blue PWM control output |
| 4 | GND | to | Ground connection |
| 5 | DOUT | Data output | Display data cascade output |
| 6 | DIN | Data entry | Display data entry |
| 7 | SET | Mode setting | Connected to VDD: low speed mode; Hang in the air; High speed mode |
| 8 | VDD | Logic power supply |
The parameters of UCS1903 three-channel LED driver IC include:
- Operating voltage: 0.5 ~ VDD + 0.5V
- Operating temperature: Topt 25 ~ +85 ℃
- Storage temperature: Tstg 55 ~ +150 ℃
- Recommended work scope: (If no special instructions,TA =? 20 ~ +70℃,VSS =0V)
- Logical power supply voltage (VDD) : -6-V -
- High level input voltage (VIH) : 0.7VDD - VDD V -
- Low-level input voltage (VIL) : 0-0.3VDD V -
- Electrical parameters: (If no special instructions,TA =? 20 ~ +70℃,VDD =4.5 ~ 5.5V,VSS =0V)
- Low level output current (IOL1) : -17.5-mA (G,B)
- Data transfer rate (FMAX) : 400 -- Kbps
- Duty cycle: 50%
- Function description: The chip adopts single-line communication mode and sends signals by means of return to zero code. After the chip is powered on and reset, the data from the DIN terminal is accepted. After receiving enough 24 bits, the DO port starts to forward the data for the next chip to provide input data. Before forwarding, the DO interface is always lowered. At this time, the chip will not accept new data, and the chip OUTR, OUTG, OUTB three PWM output outlets will send corresponding signals with different duty cycles according to the received 24bit data, and the signal period is 4ms.
Package outline and dimensions:
| symbol | mm | inches | ||
| Minimum value | Maximum value | Minimum value | Maximum value | |
| A | 1.35 | 1.75 | 0.053 | 0.069 |
| A1 | 0.1 | 0.25 | 0.004 | 0.01 |
| A2 | 1.35 | 1.55 | 0.053 | 0.061 |
| b | 0.33 | 0.51 | 0.013 | 0.02 |
| c | 0.17 | 0.25 | 0.006 | 0.01 |
| D | 4.7 | 5.1 | 0.185 | 0.2 |
| E | 3.8 | 4 | 1.150 | 0.157 |
| E1 | 5.8 | 6.2 | 0.228 | 0.244 |
| e | 1.27（BSC） | 0.50（BSC） | ||
| l | 0.4 | 1.27 | 0.016 | 0.05 |
| Theta | 0° | 8° | 0° | 8° |
