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| 型号： | LP5521YQX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 17/44页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER RGB 24-LLP |
| 标准包装： | 4,500 |
| 系列： | PowerWise® |
| 恒定电流： | 是 |
| 拓扑： | PWM，切换式电容器（充电泵） |
| 输出数： | 3 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，照明管理装置（LMU） |
| 类型 - 次要： | RGB |
| 频率： | 1.25MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 4.55V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-LLP |
| 包装： | 带卷 (TR) |
| 工作温度： | -30°C ~ 85°C |
| 其它名称： | LP5521YQX |
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SNVS441F – JANUARY 2007 – REVISED FEBRUAY 2013
Table 7. R Channel PC register (09H), G CHANNEL PC register (0AH), B CHANNEL PC register (0BH)
Name
PC
Bit
3:0
Description
Program counter value from 0 to 15d
Table 8. ENABLE register (00H)
Name
R_EXEC
G_EXEC
B_EXEC
Bit
5:4
3:2
1:0
Description
R channel program execution
00b = Hold: Wait until current command is finished then stop while EXEC mode is hold. PC can be read
or written only in this mode.
01b = Step: Execute instruction defined by current R channel PC value, increment PC and change
R_EXEC to 00b (Hold)
10b = Run: Start at program counter value defined by current R channel PC value
11b = Execute instruction defined by current R channel PC value and change R_EXEC to 00b (Hold)
G channel program execution
00b = Hold: Wait until current command is finished then stop while EXEC mode is hold. PC can be read
or written only in this mode.
01b = Step: Execute instruction defined by current G channel PC value, increment PC and change
G_EXEC to 00b (Hold)
10b = Run: Start at program counter value defined by current G channel PC value
11b = Execute instruction defined by current G channel PC value and change G_EXEC to 00b (Hold)
B channel program execution
00b = Hold: Wait until current command is finished then stop while EXEC mode is hold. PC can be read
or written only in this mode.
01b = Step: Execute instruction defined by current B channel PC value, increment PC and change
B_EXEC to 00b (Hold)
10b = Run: Start at program counter value defined by current B channel PC value
11b = Execute instruction defined by current B channel PC value and change B_EXEC to 00b (Hold)
EXEC registers are synchronized to 32 kHz clock. Delay between consecutive I 2 C writes to ENABLE register
(00H) need to be longer than 488 μ s (typ.).
DIRECT Control
When R, G or B channel mode is set to 11b, the LP5521 drivers work in direct control mode. LP5521 LED
channels can be controlled independently through I 2 C. For each channel there is a PWM control register and a
output current control register. With output current control register is set what is the maximum output current with
8-bit resolution, step size is 100 μ A. Duty cycle can be set with 8-bit resolution. Direct control mode resets
respective channel’s PC. PWM control bits are presented in following table:
Table 9. R_PWM register (02H), G_PWM register (03H), B_PWM register (04H):
Name
PWM
Bit
7:0
Description
LED PWM value during direct control operation mode
0000 0000b = 0%
1111 1111b = 100%
If charge pump automatic gain change is used in this mode, then PWM values need to be written 0 before
changing the drivers’ operation mode to disabled (00b) to ensure proper automatic gain change operation.
LED CONTROLLER PROGRAMMING COMMANDS
LP5521 has three independent programmable channels (R, G, B). Trigger connections between channels are
common for all channels. All channels have own program memories for storing complex patterns. Brightness
control and patterns are done with 8-bit PWM control (256 steps) to get accurate and smooth color control.
Program execution is timed with 32 768 Hz clock. This clock can be generated internally or external 32 kHz clock
can be connected to CLK_32K pin. Using external clock enables synchronization of LED timing to this clock
rather than internal clock. Selection of the clock is made with address 08H bits INT_CLK_EN and CLK_DET_EN.
See EXTERNAL CLOCK DETECTION for details.
Supported commands are listed in the table below. Command compiler is available for easy sequence
programming. With Command compiler it is possible to write sequences with simple ASCII commands,
which are then converted to binary or hex format. See application note "LP5521 Programming
Considerations" for examples of Command compiler usage.
Copyright ? 2007–2013, Texas Instruments Incorporated
Product Folder Links: LP5521
17
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相关代理商/技术参数 |
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| LP5522 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Programmable LED Driver |
| LP5522TM | 制造商:Texas Instruments 功能描述:LED DRVR 1Segment 3.3V/5V 6-Pin uSMD T/R |
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