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SM8133B Datasheet(PDF) 11 Page - Nippon Precision Circuits Inc |
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SM8133B Datasheet(HTML) 11 Page - Nippon Precision Circuits Inc |
11 / 20 page SM8133B NIPPON PRECISION CIRCUITS INC.—11 FUNCTIONAL DESCRIPTION Serial Interface The SM8133B uses a 3-wire serial interface to control each setting. Input data on SDA is input MSB first in an 8 clock pulse cycle structure, with the first 4 cycles of data setting the mode and the next 4 the corresponding mode data. Data bits on SDA are read as received data on the rising edges of the SCK clock after EN goes HIGH. Only the leading 8 bits on SDA are read after EN goes HIGH and all subsequent input data bits are ignored, but the received data is reflected in SM8133B operation with timing almost simultaneous with the EN falling edge. Conversely, if less than 8 bits are input on SDA, the data is ignored to prevent incorrect operation. All registers are write-only, and their status cannot be read. After power is applied, an internal power-ON reset circuit initializes all registers to logic level LOW in standby mode. However, the possibility exists that there may be insufficient reset time, depending on the VIN input voltage rise time and fall time, so reset mode (0H or EH) should be expressly invoked after power is applied. There is no restriction in the input sequence when set- ting parameters. However, since the parameters are set in the same order as the data input sequence and the time taken from LED ON/OFF data input to LED dimming data input can exceed the soft start time, it is highly advisable to enter the LED dimming data first. The charge pump circuit, that supplies the LED drive voltage, starts whenever any parameter in address 5H (LED ON register) is set to 1, with the LED drive voltage output on VOUT. Conversely, when all parameters in address 5H are set to 0, all other parameter data settings input after reset are retained in standby mode. The serial interface pins EN, SDA, CSK, and RESETB are CMOS inputs, thus the input voltage on VIN must be a logic-level voltage and should not be left open circuit (floating). Control Data I Mode selection Mode selection data Setting data M1 M2 M3 M4 D1 D2 D3 D4 MSB Data 1 Data 2 Data 3 Data 4 Data 5 Data 6 LSB Control data input sequence Mode data 0H 1H 2H 3H 4H Mode Reset Grouping A group dimming B group dimming DIN7 dimming M1-M2-M3-M4 L-L-L-L L-L-L-H L-L-H-L L-L-H-H L-H-L-L Mode data 5H 6H EH FH Other Mode LED ON System settings Reset Serial input test NPC test M1-M2-M3-M4 L-H-L-H L-H-H-L H-H-H-L H-H-H-H − SCK M1 M2 EN M3 M4 D1 D2 D3 D4 SDA |
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