Datasheet HT16D35A/HT16D35B (Holtek)

HT16D35A/HT16D35B RAM Mapping 28×8 Constant Current LED Driver Features Applications
• Operating voltage: 2.7V~5.5V • Industrial control displays • LED display: 28 rows and 8 commons • Mobile phones • LED data RAM1: 28×8×6 bits=1344 bits for Gray • Traffic signboards and information displays mode • Digital clocks, thermometers, counters, electronic • LED data RAM2: 28×8×6 bits=1344 bits for FADE meters mode • Instrumentation readouts • LED data RAM3: 28×8 bits=224 bits for Binary • Other consumer applications mode or Matrix masking • LED displays • LED data RAM4: 28×8 bits=224 bits for Universal Segment function • LED data RAM5: 8×8 bits=64 bits for Universal
General Description
COM function The HT16D35A/HT16D35B are high accuracy • Integrated 4.92MHz RC oscillator constant current and memory mapping LED display • 64-level global brightness scale controller/drivers. The maximum display capacity of the devices is 224 patterns composed of 28 rows • Binary scale mode or Gray scale mode and 8 commons. The devices can generate a 64 step • Global blinking or fade function Gray Scale (PWM data) using software controlled • Universal COM and Universal Segment function PWM circuitry and 64 LED illumination levels using • Automatic scroll function: up/down/left/right software controlled PWM circuitry. The devices provide constant current outputs control using external • Continuous lighting function for ROW24~ROW27 resistors for each row output terminal. A serial • External current reference control using external interface is provided to allow the devices to receive resistor instructions for its command mode and data mode. • Supports row port max. 45mA sink constant current Only three lines are required for device interfacing to • 8-level current reference adjustment a host controller. The display capacity can be easily extended by cascading the devices thus expanding its • Over temperature protection circuit application possibilities. The devices are compatible • I2C-bus or SPI 3-wire interface with most microcontrollers offering easy interfacing • Cascade function for extend applications via their two serial interfaces, an I2C interface or a • Package Type: 48-pin LQFP-EP SPI 3-wire serial interface.
Selection Table Part Number Interface
HT16D35A 3-wire SPI HT16D35B I2C Rev. 1.00 1 July 12, 2017 Rev. 1.00 PB July 12, 2017 Document Outline Features Applications General Description Selection Table Block Diagram Pin Assignment Pin Description Absolute Maximum Ratings D.C. Characteristics A.C. Characteristics A.C. Characteristics – SPI 3-wire Serial Bus A.C. Characteristics – I2C Serial Bus Timing Diagrams SPI 3-Wire Serial Bus Timing I2C Bus Timing Power on Reset Timing Functional Description Power-on Reset LED Driver System Oscillator ROW Driver Outputs Column Driver Outputs Address Pointer Over Temperature Protection Constant Current Output Setting the Output Current Load Supply Voltage – LED_V Display Data RAM – DDRAM LED Driver Output Waveform Output Signal Timing Fade Data RAM Universal COM (UCOM) RAM Data Universal SEG (USEG) RAM Data Matrix Masking RAM Data Command Description – Command Table Software Reset Binary/Gray Select Number of COM Outputs Global Blinking Cascade Mode System Control Constant Current Ratio Global Brightness Mode Control Scrolling Control Scrolling Speed COM Pin Control ROW Pin Control Direct Pin Control Read Flag Read Status Write Display Data Write Fade Data Write UCOM Data Write USEG Data Write Matrix Masking Data SPI 3-wire Serial Interface I2C Serial Interface Power Supply Sequence Operation Flow Chart Application Circuits LED Matrix Circuit Single LED IC Application Cascade Function Cascade Control Flow Package Information 48-pin LQFP (7mm×7mm) Outline Dimensions (Exposed Pad)