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參數(shù)資料
| 型號(hào)： | LP3943ISQ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | RGB/White/Blue 16-LED Fun Light Driver |
| 中文描述： | LED DISPLAY DRIVER, QCC24 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 264K |
| 代理商： | LP3943ISQ |
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Application Notes
(Continued)
Programming Example:
Dim LEDs 0 to 7 at 1 Hz at 25% duty cycle
Dim LEDs 8 to 12 at 5 Hz at 50% duty cycle
Set LEDs 13, 14 and 15 off
Step 1: Set PSC0 to achieve DIM0 of 1s
Step 2: Set PWM0 duty cycle to 25%
Step 3: Set PSC1 to achieve DIM1 of 0.2s
Step 4: Set PWM1 duty cycle to 50%
Step 5: Set LEDs 13, 14 and 15 off by loading the data into LS3 register
Step 6: Set LEDs 0 to 7 to point to DIM0
Step 7: Set LEDs 8 to 12 to point to DIM1
Step
Description
Register Name
PSC0
Set to (Hex)
0x09F
1
Set DIM0 = 1s
1 = (PSC0 + 1)/160
PSC0 = 159
Set duty cycle to 25%
Duty Cycle = PWM0/256
PWM0 = 64
Set DIM1 = 0.2s
0.2 = (PSC1 + 1)/160
PSC1 = 31
Set duty cycle to 50%
Duty Cycle = PWM1/256
PWM1 = 128
LEDs 13, 14 and 15 off
Output = HIGH
LEDs 0 to 7
Output = DIM0
LEDs 8 to 12
Output = DIM1
2
PWM0
0x40
3
PSC1
0x1F
4
PWM1
0x80
5
LS3
0x03
6
LS0, LS1
LS0 = 0xAA
LS1 = 0xAA
LS2 = 0xFF
LS3 = 0x03
7
LS2, LS3
REDUCING I
Q
WHEN LEDS ARE OFF
In many applications, the LEDs and the LP3943 share the
same V
, as shown in
Section Typical Application Circuit
.
When the LEDs are off, the LED pins are at a lower potential
than V
, causing extra supply current (
I
). To minimize
this current, consider keeping the LED pins at a voltage
equal to or greater than V
DD
.
20079614
FIGURE 9. Methods to Reduce I
Q
When LEDs Are Off
L
www.national.com
11
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| LP3943ISQ/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 Funlight Led Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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| LP3943ISQX | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP3943ISQX/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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