TM1926D(TA1819 SOP16)

TM1926D is a dedicated 12-channel LED fixed constant-current driver control circuit, integrating an MCU single-wire digital interface, data latches, LED fixed constant-current drivers, and PWM brightness control circuitry. The chip supports daisy-chain cascading via a single-wire digital interface (DI, DO), allowing an external controller to control both the chip and any downstream cascaded chips using just a single wire. The PWM brightness of each TM1926D output port can be individually configured via the external controller. The VDD pin integrates an internal 5V Zener diode, minimizing the number of external components. This product offers excellent performance and reliable quality.

Key features

• Power CMOS process
• OUT port voltage rating: 24V
• OUT port fixed constant current: 17mA
• VDD built-in 5V Zener diode; supports 6~24V with series resistor
• Brightness adjustment circuit, 256-level adjustable brightness
• Single-wire serial cascade interface
• Oscillation method: built-in RC oscillator with clock synchronization based on data line signals; after receiving data for the current unit, automatically regenerates subsequent data and transmits it to the next stage via the data output pin — no signal distortion or attenuation over cascaded distances
• Built-in power-on reset circuit; lights blue at power-on (25% duty cycle)
• PWM control supports 256-level adjustment, scan frequency ≥ 3KHz
• Data reception and decoding via single signal line
• At 30 frames/s refresh rate, cascade count ≥ 1024 points
• Data transfer rate up to 800Kbps
• Transmission distance between any two points ≥ 30 meters
• Package: SOP16, DIP16