전자부품 데이터시트 검색엔진 |
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SM8132AW 데이터시트(PDF) 8 Page - Nippon Precision Circuits Inc |
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SM8132AW 데이터시트(HTML) 8 Page - Nippon Precision Circuits Inc |
8 / 18 page SM8132A NIPPON PRECISION CIRCUITS INC.—8 FUNCTIONAL DESCRIPTION LED Drive Current Setting The SM8132A LED drive current setting is controlled by the combination of resistance connected to ISET and the EN input signals. (1) Setting LED Drive Current using RSET The maximum drive current per LED (when DATA = 1) is determined by the external resistance connected to ISET. For example, if ILED MAX = 15mA, from the graph below, a resistance “RSET” of 15kΩ should be con- nected between ISET and GND. Note that while RSET can have a maximum resistance 50k Ω, the total LED output current must not exceed the maximum output current of 80mA. (2) Setting LED Drive Current using EN Input Signals The EN input ENABLE/DISABLE circuit, also simultaneously counts the number of input pulses using an internal counter and adjusts the LED drive current setting in response. The internal 4-bit counter provides 16- step (DATA = 1 to 16) adjustment, where each step is 1/15th of the maximum current (ILED MAX) set by RSET. On the 16th pulse (DATA = 16), the LED drive current control circuit shuts down. On the 17th pulse (DATA = 1), the LED drive current is reset to the maximum current value. As the current is set to the maximum value on the first pulse, applications without pulse input can also be employed (by controlling brightness using RSET). ISET RSET GND LED drive current maximum setting using RSET 0 10 20 30 40 50 0 10 20 30 40 50 RSET [k Ω] EN EN input pulse 12 3 GND LED drive current setting variation using EN input pulse modulation 0 5 10 15 20 25 04 8 12 16 DATA set by EN input pulse RSET=10k Ω RSET=15k Ω RSET=20k Ω Table. LED drive current setting and EN input pulse count 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 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 ILED 15/15 14/15 13/15 12/15 11/15 10/15 9/15 8/15 7/15 6/15 5/15 4/15 3/15 2/15 1/15 0 |
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