點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
新竹市科學園區展業一路9號7樓之1
9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.
DD312
Tel：886-3-5645656
Fax：886-3-5645626
Block Diagram
Pin Connection
1
2
3
8
GND
EN
VCC
7
6
5
ALARM
REXT
SOP8
OUT
4
RESERVED
REXT
Pin Description
PIN No.
PIN NAME
GND
FUNCTION
TO252:3/SOP8:1
Ground terminal.
Output current enable terminal.
Sink constant current outputs (open-drain).
TO252:5/SOP8:2
TO252:2/SOP8:3
SOP8:4
EN
OUT
RESERVED
Terminal for testing, user should leave this pin open.
External resistor connected between REXT and GND
for driver current value setting.
TO252:1/SOP8:5,6
REXT*1
Output open drain terminal: (connected to a pull-high resistor)
‘H’ for normal conditions,
SOP8:7
ALARM
VCC
‘L’ for LED open or chip overheated.
TO252:4/SOP8:8
Power supply terminal.
*1 Notice that both REXT pins (SOP8: pin5 and pin6) should be connected in PCB layout.
HIGH CONSTANT CURRENT LED DRIVER Version:A.001
Page 2
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