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T6313A Datasheet(PDF) 6 Page - Taiwan Memory Technology |
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T6313A Datasheet(HTML) 6 Page - Taiwan Memory Technology |
6 / 10 page TE CH tm Preliminary T6313A TM Technology Inc. reserves the right P. 6 Publication Date: JAN. 2006 to change products or specifications without notice. Revision:C Functional Description The T6313A uses a fractional (x1.5) conversion charge pump to generate a voltage for the regulated current sinks. These current sinks are used to ensure a constant current for each LED. The charge pump can generate total 80 mA of output current, so each of the 4 LED outputs can be powered with up to 20 mA of current. The T6313A uses two wires to enable and set the LED currents. The EN pin is used to either enabling or disabling the T6313A. When EN is high, then the numbers of pulse shift from SET pin are valid and an internal counter counts up from 1 from the first rising edge of SET and increases by one when another rising edge of SET is shifted in. The outputs of the counter will map to 32 levels of LED current. Each level (code) is mapped to a different current, which is a defferent brightness (Fig-2 & Tabel1). Once the final clock cycle is input for the desired brightness level, the SET pin is held high to maintain the device output current at the programmed level. The device is disabled 350us after the SET pin transitions to a logic low state. A level will stay until EN goes low. T6313A is power down when EN goes low. After EN goes low then any pulse shifting from SET pin is invalid (Fig-3). I diode(mA) 0 5 10 15 20 25 Code Fig - 2 |
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