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BD1754HFN-TR Datasheet(PDF) 7 Page - Rohm

Part # BD1754HFN-TR
Description  Constant Current LED Driver with 64 Dimming Steps for up to 4 LEDs
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD1754HFN-TR Datasheet(HTML) 7 Page - Rohm

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BD1754HFN
Datasheet
TSZ02201-0G3G0C200060-1-2
9.NOV.2012 Rev.001
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
●Description of Operations
(1) UPIC (= Uni-Port Interface Control) interface
BD1754HFN has a single-line digital control interface (UPIC) that can control the power ON/OFF and LED current
value through the EN pin. The LED current decreases by one step depending on the number of rising edges. After the
number of rising edge is reached to the minimum output current (64 rising edges), the next rising edge changes the
output current to the maximum value at startup time. To maintain any output current, the EN pin must be kept at ‘H’
level. To power off, the EN pin must be kept at ‘L’ level for more than 1ms.
MAX Current
MAX Current
EN
ILED
(Internal)
State
C64
C63
C62
C61
C62
C60
C2
C1
C64
C63
THI
TLO
TOFF
OFF
OFF
MIN Current
OFF
OFF
Figure 13. Brightness Control Method
EN
THI
TLO
TOFF
Figure 14. UPIC Interface
By following sequence, UPIC can control current driver for MAX current and OFF state only.
Figure 15. UPIC Interface usage for MAX current or OFF only
MAX
MAX
EN
ILED
(Internal)
State
C64
C64
TOFF
OFF
OFF
OFF
TOFF
OFF
OFF
OFF


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