TM1814B

TM1814B is a four-channel constant-current adjustable LED driver IC. An MCU can input constant-current and PWM configuration data to the TM1814B to achieve a wide variety of display effects. The chip integrates a single-wire digital interface, data latches, and LED constant-current driver circuits. The VDD pin incorporates an internal 5V Zener diode, minimizing external component count. Suitable for LED decorative products such as guardrail tubes and point light sources.

Applications

• Guard rail tubes
• LED decorative products such as point light sources

Key features

• Power CMOS process
• OUT port withstand voltage: 32V
• VDD built-in 5V zener diode; supports 6~24V with series resistor
• Constant current output: 64-level adjustment (6.5mA—38mA)
• PWM brightness control: 256-level adjustable
• Accurate current output (channel-to-channel) max error: ±3%; (chip-to-chip) max error: ±5%
• Single-wire serial cascade interface oscillation: built-in RC oscillator with clock synchronization based on data line signals; automatically regenerates subsequent data after receiving the current unit's data and forwards it to the next stage via data output — no signal distortion or attenuation over cascaded distance
• Built-in power-on reset circuit; all registers initialized to zero after power-on reset
• External control mode data transfer rate: 800KHz
• Package: SOP8