SM16705 Datasheet, PDF (4/15 Pages) SamHop Microelectronics Corp. – 8-BIT CONSTANT CURRENT LED DRIVER

SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
TRUTH TABLE
CLOCK LATCH ENABLE SERIAL-IN OUT0 … OUT5 … OUT7 SERIAL-OUT
UP
H
L
UP
L
L
UP
H
L
DOWN
X
L
DOWN
X
H
D_n
D_{n + 1}
D_{n + 2}
D_{n + 3}
D_{n + 3}
D_n … D_{n - 5} … D_{n - 7}
No change
D_{n + 2} … D_{n - 3} … D_{n - 5}
D_{n + 2} … D_{n - 3} … D_{n - 5}
Off
D_{n - 8}
D_{n - 7}
D_{n - 6}
D_{n - 5}
D_{n - 5}
Note : 1.OUT0~7=on when Dn="H" ; OUT0~7=off when Dn="L".
2. In order to ensure that the level of the power supply voltage is correct, an external resistor
must be connected betwen R-EXT and GND.
EQUIVALENT CIRCUIT OF INPUTS AND OUTPUTS
1. ENABLE terminal
VDD
RIN(Up)
2. LATCH terminal
VDD
ENABLE
LATCH
GND
GND
RIN(Down)
3. CLOCK, SERIAL-IN terminal
VDD
CLOCK,
SERIAL-IN
GND
4. SERIAL-OUT terminal
VDD
GND
SERIAL-OUT
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