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MAX6980 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6980 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page Detailed Description The MAX6971 LED driver comprises a 4-wire serial interface driving 16 constant-current-sinking, open- drain output ports. The outputs drive LEDs in either static or multiplex applications (Figure 1). The constant- current outputs are guaranteed for current accuracy not only with chip-supply voltage variations (5V ±10% and 3V to 5.5V), but also over a realistic range of driver output voltage drop (0.8V to 2.5V). The drivers use cur- rent-sensing feedback circuitry (not simple current mir- rors) to ensure very small current variations over the full allowed range of output voltage (see the Typical Operating Characteristics). The 4-wire serial interface comprises a 16-bit shift reg- ister and a 16-bit transparent latch. The shift register is written through a clock input, CLK, and a data input, DIN, and the data propagates to a data output, DOUT. The data output allows multiple drivers to be cascaded and operated together. The contents of the 16-bit shift register are loaded into the transparent latch through a latch-enable input, LE. The latch is transparent to the shift register outputs when high, and latches the current state on the falling edge of LE. Each driver output is an open-drain, constant-current sink that should be connected to the cathode of either a single LED or a series string of multiple LEDs. The LED anode can be connected to a supply voltage of up to 36V, independent of the MAX6971 supply, V+. The constant-current capability is up to 55mA per output, set for all eight outputs by an external resistor, RSET. 4-Wire Serial Interface The serial interface on the MAX6971 is a 4-wire serial interface using four inputs (DIN, CLK, LE, OE) and a data output (DOUT). This interface is used to write dis- play data to the MAX6971. The serial-interface data word length is 16 bits, D0–D15. See Figure 2. The functions of the five interface pins are as follows. DIN is the serial-data input, and must be stable when it is sampled on the rising edge of CLK. Data is shifted in, MSB first. This means that data bit D15 is clocked in first, followed by 15 more data bits finishing with the LSB, D0. 16-Port, 36V Constant-Current LED Driver _______________________________________________________________________________________ 7 . D15 D14 tDS tDH tCL tCP tDO tOEW tOEL tf tr tOEH tLS tLW tCH D1 D0 D7 LE CLK DIN DOUT OE OUT_ 80% 20% tLF Figure 2. 4-Wire Serial-Interface Timing Diagram |
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