参数资料
型号: MC13892AJVLR2
厂商: Freescale Semiconductor
文件页数: 117/158页
文件大小: 0K
描述: IC PMU I.MX51/37/35/27 186MAPBGA
标准包装: 1,000
应用: 电池管理,显示器(LED 驱动器),手持/移动设备,电源
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 186-LFBGA
供应商设备封装: 186-PBGA(12x12)
包装: 带卷 (TR)
FUNCTIONAL DEVICE OPERATION
LIGHTING SYSTEM
Table 107. Signaling LED Drivers Current Programming
000
001
010
011
100
101
110
111
LEDx[2:0] (93)
LEDx Current Level (mA)
0.0
3.0
6.0
9.0
12
15
18
21
Notes
93. “x” represents for R, G and B
Table 108. Signaling LED Drivers Duty Cycle Programming
LEDxDC[5:0] (94)
000000
000001
010000
011111
1xxxxx
Duty Cycle
0/32, Off
1/32
16/32
31/32
32/32, Continuously On
Notes
94. “x” represents R, G and B
Blue LEDs or bright green LEDs require more headroom than red and normal green signal LEDs. In the application, a 5.0 V
or equivalent supply rail is therefore required. This is provided by the integrated boost regulator SWBST. To make software
programming easier, an LEDSWBSTEN SPI bit has been provided in the Blue LED register to enable the boost regulator. Note
the enable for the boost regulator is an OR of the following SPI bits (SWBSTEN, USBSWBSTEN, and LEDSWBSTEN). For more
details on the boost regulator and its control, see Supplies .
As with the backlight driver channels, the signaling LED drivers include ramp up and ramp down patterns are implemented in
hardware. Ramp patterns for each of the drivers is accessed with the corresponding LEDxRAMP bit.
The ramp itself is generated by increasing or decreasing the PWM duty cycle with a 1/32 step every 1/64 seconds. The ramp
time is therefore a function of the initial set PWM cycle and the final PWM cycle. As an example, starting from 0/32 and going to
32/32 will take 500 ms while going to from 8/32 to 16/32 takes 125 ms.
Note that the ramp function is executed upon every change in PWM cycle setting. If a PWM change is programmed via SPI
when LEDxRAMP = 0, then the change is immediate rather than spread out over a PWM sweep.
For color mixing and in order to guarantee a constant color, the color mixing should be obtained by the current level setting so
that the intensity is set through the PWM duty cycle.
In addition, programmable blink rates are provided. Blinking is obtained by lowering the PWM repetition rate of each of the
drivers through LEDxPER[1:0], while the on period is determined by the duty cycle setting. To avoid high frequency spur coupling
in the application, the switching edges of the output drivers are softened. During blinking, so LEDxPER[1:0] is not “00”, ramping
and dimming patterns cannot be applied.
Table 109. Signal LED Drivers Period Control
LEDxPER[1:0]
00
01
10
11
Repetition Rate
1/256
1/8
1
2
Units
s
s
s
s
MC13892
Analog Integrated Circuit Device Data
Freescale Semiconductor
117
相关PDF资料
PDF描述
MC13892VLR2 IC PMU I.MX51/37/35/27 186MAPBGA
RCA18DTMD CONN EDGECARD 36POS R/A .125 SLD
EVAL-ADG2108EBZ BOARD EVAL FOR ADG2108
RCA18DTBN CONN EDGECARD 36POS R/A .125 SLD
RCA18DTBH CONN EDGECARD 36POS R/A .125 SLD
相关代理商/技术参数
参数描述
MC13892BJVK 功能描述:PMIC 解决方案 PMUIC W/4 BUCK/12 LDO RG RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel
MC13892BJVKR2 功能描述:PMIC 解决方案 PMUIC W/4 BUCK/12 LDO RG RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel
MC13892BJVL 功能描述:PMIC 解决方案 PMUIC W/4 BUCK/12 LDO RG RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel
MC13892BJVLR2 功能描述:PMIC 解决方案 PMUIC W/4 BUCK/12 LDO RG RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel
MC13892CJVK 功能描述:PMIC 解决方案 POWER MGMT IC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel