特点
| 应用
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引脚定义
引脚号 | 名称 | 功能 |
1~16 | OUT3~OUT18 | Output channel 3~18 for LEDs. 输出通道3~18 |
17, 39 | GND | Ground. 地 |
18~35 | OUT19~OUUT36 | Output channel 19~36 for LEDs. 输出通道19~36 |
36 | SDB | Shutdown the chip when pulled low. 关断芯片,低电平有效。需接100k下拉电阻,使开机默认为低电平的GPIO控制。芯片关断后,I2C仍可对寄存器进行写操作。 |
37 | AD | I2C address setting. I2C器件地址选择 |
38 | VCC | Power supply. 电源输入端,接0.1uF和1uF电容到地 |
40 | R_EXT | Input terminal used to connect an external resistor. This regulates the global output current. 每一路通道最大电流IMAX控制引脚,外接REXT电阻到地, |
41 | SDA | I2C serial data. I2C时钟, 需接上拉电阻(建议4.7k),1.8V/3.3V系统均可使用 |
42 | SCL | I2C serial clock. I2C数据,需接上拉电阻(建议4.7k),1.8V/3.3V系统均可使用 |
43,44 | OUT1, OUT2 | Output channel 1, 2 for LEDs. 输出通道1~2 |
EP | Exposed Thermal Pad | Connect to GND. 接地散热。 |

