Datasheet HT16D35A/HT16D35B (Holtek) - 10
| Fabricante | Holtek |
| Descripción | RAM Mapping 28×8 Constant Current LED Driver |
| Páginas / Página | 71 / 10 — HT16D35A/HT16D35B. Load Supply Voltage – LED_VDD. HT16D35. Display Data … |
| Revisión | 1.00 |
| Formato / tamaño de archivo | PDF / 2.3 Mb |
| Idioma del documento | Inglés |
HT16D35A/HT16D35B. Load Supply Voltage – LED_VDD. HT16D35. Display Data RAM – DDRAM. Output. COM0. COM1. COM2. COM3. COM4. COM5. COM6. COM7
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HT16D35A/HT16D35B Load Supply Voltage – LED_VDD
The devices can be operated satisfactorily when VDS lies between a value of 0.7V to 2.0V. It is recommended to use a low supply voltage for LED_VDD to reduce the VDS value which will reduce the device power consumption and subsequent device temperature. LED_VDD COM Control Signal VF
HT16D35
ROW VDS
Display Data RAM – DDRAM
In the Binary Mode, the display RAM is a static 28×8-bit capacity RAM in which is stored the LED data. A logic “1” in the RAM bit-map indicates an “on” state of the corresponding LED ROW. Similarly a logic 0 indicates an “off” state. There is a one-to-one correspondence between the display memory addresses and the ROW outputs and between the individual bits of a RAM word and the column outputs. The following shows the mapping from the RAM to the LED pattern.
Output COM0 COM1 COM2 COM3 COM4 COM5 COM6 COM7 Address A[7:0]
ROW0 D7 D6 D5 D4 D3 D2 D1 D0 00h ROW1 D7 D6 D5 D4 D3 D2 D1 D0 01h ROW2 D7 D6 D5 D4 D3 D2 D1 D0 02h ROW3 D7 D6 D5 D4 D3 D2 D1 D0 03h ROW4 D7 D6 D5 D4 D3 D2 D1 D0 04h ROW5 D7 D6 D5 D4 D3 D2 D1 D0 05h ROW6 D7 D6 D5 D4 D3 D2 D1 D0 06h ROW7 D7 D6 D5 D4 D3 D2 D1 D0 07h ROW8 D7 D6 D5 D4 D3 D2 D1 D0 08h ROW9 D7 D6 D5 D4 D3 D2 D1 D0 09h ROW10 D7 D6 D5 D4 D3 D2 D1 D0 0Ah ROW11 D7 D6 D5 D4 D3 D2 D1 D0 0Bh ROW12 D7 D6 D5 D4 D3 D2 D1 D0 0Ch ROW13 D7 D6 D5 D4 D3 D2 D1 D0 0Dh ROW14 D7 D6 D5 D4 D3 D2 D1 D0 0Eh ROW15 D7 D6 D5 D4 D3 D2 D1 D0 0Fh ROW16 D7 D6 D5 D4 D3 D2 D1 D0 10h ROW17 D7 D6 D5 D4 D3 D2 D1 D0 11h ROW18 D7 D6 D5 D4 D3 D2 D1 D0 12h ROW19 D7 D6 D5 D4 D3 D2 D1 D0 13h ROW20 D7 D6 D5 D4 D3 D2 D1 D0 14h Rev. 1.00 10 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)
The devices can be operated satisfactorily when VDS lies between a value of 0.7V to 2.0V. It is recommended to use a low supply voltage for LED_VDD to reduce the VDS value which will reduce the device power consumption and subsequent device temperature. LED_VDD COM Control Signal VF
HT16D35
ROW VDS
Display Data RAM – DDRAM
In the Binary Mode, the display RAM is a static 28×8-bit capacity RAM in which is stored the LED data. A logic “1” in the RAM bit-map indicates an “on” state of the corresponding LED ROW. Similarly a logic 0 indicates an “off” state. There is a one-to-one correspondence between the display memory addresses and the ROW outputs and between the individual bits of a RAM word and the column outputs. The following shows the mapping from the RAM to the LED pattern.
Output COM0 COM1 COM2 COM3 COM4 COM5 COM6 COM7 Address A[7:0]
ROW0 D7 D6 D5 D4 D3 D2 D1 D0 00h ROW1 D7 D6 D5 D4 D3 D2 D1 D0 01h ROW2 D7 D6 D5 D4 D3 D2 D1 D0 02h ROW3 D7 D6 D5 D4 D3 D2 D1 D0 03h ROW4 D7 D6 D5 D4 D3 D2 D1 D0 04h ROW5 D7 D6 D5 D4 D3 D2 D1 D0 05h ROW6 D7 D6 D5 D4 D3 D2 D1 D0 06h ROW7 D7 D6 D5 D4 D3 D2 D1 D0 07h ROW8 D7 D6 D5 D4 D3 D2 D1 D0 08h ROW9 D7 D6 D5 D4 D3 D2 D1 D0 09h ROW10 D7 D6 D5 D4 D3 D2 D1 D0 0Ah ROW11 D7 D6 D5 D4 D3 D2 D1 D0 0Bh ROW12 D7 D6 D5 D4 D3 D2 D1 D0 0Ch ROW13 D7 D6 D5 D4 D3 D2 D1 D0 0Dh ROW14 D7 D6 D5 D4 D3 D2 D1 D0 0Eh ROW15 D7 D6 D5 D4 D3 D2 D1 D0 0Fh ROW16 D7 D6 D5 D4 D3 D2 D1 D0 10h ROW17 D7 D6 D5 D4 D3 D2 D1 D0 11h ROW18 D7 D6 D5 D4 D3 D2 D1 D0 12h ROW19 D7 D6 D5 D4 D3 D2 D1 D0 13h ROW20 D7 D6 D5 D4 D3 D2 D1 D0 14h Rev. 1.00 10 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)