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SM8136A Datasheet(PDF) 5 Page - Nippon Precision Circuits Inc |
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SM8136A Datasheet(HTML) 5 Page - Nippon Precision Circuits Inc |
5 / 15 page SM8136A SEIKO NPC CORPORATION —5 FUNCTIONAL DESCRIPTION LED Drive Current Setting The SM8136A LED drive current can be set using the EN pin. The EN input is used to enable/disable circuit operation. It also is used by a built-in counter that counts the number of input pulses in order to set the LED current value. The built-in counter is a 4-bit counter for 16-step adjustment (DATA = 1 to 16). On the 16th pulse (DATA = 16), the LED current drive circuit shuts down and LED current is zero. On the 17th pulse (DATA = 1), the current returns to the maximum value. As the initial pulse (DATA = 1) sets the current to the maximum value, the device can also be used in applications that do not support pulsed input. EN Input Signal and LED Current Setting (Initialization) On the first rising edge of EN, the internal startup signal goes HIGH and LED current will start to flow after the soft start time has elapsed. As the LED current setting is adjusted by counting the number of input pulses on EN, the EN input voltage must be switched HIGH → LOW → HIGH repeatedly to set the current to a lower value. After the desired value is achieved, the EN input voltage is held HIGH to maintain the LED current set- ting. If the EN input goes LOW, the LED current does not flow. The EN data input circuit operates even though the LED current does not flow during the soft start interval, but as long as the current value is set during the soft start interval the LED drive circuits will start to drive the LEDs with that constant current setting. However, note that the setting is valid only after the power-ON reset when the VIN supply is applied. Accordingly, allow 1ms or more after connecting the VIN supply before setting the current value using the EN input. I LED current setting is determined by the number of EN input signal rising edges. Furthermore, no LED cur- rent flows until the soft start time has elapsed. Table 1. EN input pulse count and LED current setting values DATA 123456789 10 11 12 13 14 15 16 EN pulse count 123456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ILED [mA] 20.00 18.7 17.3 16.0 14.7 13.3 12.0 10.7 9.3 8.0 6.7 5.3 4.0 2.7 1.3 0 EN input signal and LED current setting EN input signal ILED1-3 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 |
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