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参数资料
| 型号： | BD1754HFN-TR |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 8-HSON |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性 |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-HSON |
| 供应商设备封装： | 8-HSON |
| 包装： | 标准包装 |
| 工作温度： | -30°C ~ 85°C |
| 其它名称： | BD1754HFN-DKR BD1754HFN-DKR-ND BD1754HFNDKR |
BD1754HFN
Datasheet
● 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.
EN
(Internal)
THI
TLO
TOFF
State
OFF
C64
C63
C62
C62
C61
C60
C2
C1
C64
C63
OFF
ILED
OFF
MAX Current
Figure 13. Brightness Control Method
MAX Current
MIN Current
OFF
THI
TLO
TOFF
EN
Figure 14. UPIC Interface
By following sequence, UPIC can control current driver for MAX current and OFF state only.
EN
TOFF
TOFF
(Internal)
State
OFF
C64
OFF
C64
OFF
ILED
OFF
MAX
OFF
MAX
OFF
Figure 15. UPIC Interface usage for MAX current or OFF only
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
7/16
TSZ02201-0G3G0C200060-1-2
9.NOV.2012 Rev.001
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