HT16D31A/HT16D31B
8×9 Constant Current LED Driver
The HT16D31A and HT16D31B are high accuracy constant current and memory mapping LED display controller/drivers. The maximum display capacity of the devices is 72 patterns composed of 8 rows and 9 commons. The devices can generate a 256 step Gray Scale (PWM data) using software controlled PWM circuitry and 256 LED illumination levels using software controlled PWM circuitry. The devices provide constant current output control using software controlled for each row output terminal. A serial interface is provided to allow the devices to receive instructions for its command mode and data mode. Only three lines are required for device interfacing to a host controller. The display capacity can be easily extended by cascading the devices thus expanding its application possibilities. The devices are compatible with most microcontrollers offering easy interfacing via their two serial interfaces, an I2C interface or an SPI 3-wire serial interface.
Features
- Logic Operating Voltage: 2.7V~5.5V
- LED Driver Operating Voltage: 4.5V~5.5V
- LED Display: 9 combinations of output pins (CA0~CA8), 8 rows and 9 commons LED Matrix
- LED Data RAM1(Max.): 8 × 9 × 8 × (2) bits = (144) × 8 bits for Gray mode
- LED Data RAM2(Max.): 8 × 9 × 4 × (2) bits = (72) × 8 bits for Fade mode
- LED Data RAM3(Max.): 1 × 9 × 8 × (2) bits = (18) × 8 bits for LED On/Off Control
- Integrated 2.4MHz RC oscillator
- 2 frame memory for animations
- 256-level global brightness scale
- Binary scale mode or Gray scale mode
- Global blinking or fade function
- Automatic scroll function: left/right
- Internal Current Reference Control
- Support max. 48mA Sink Constant Current
- 16-level Maximum current setup selection
- Current matching to ±3%
- Over temperature protection circuit
- Open/short protection circuit for each dot
- I2C-bus or SPI 3-wire Interface
- Cascade function for extend applications
- Package Type: 16-pin QFN
