参数资料
型号: KIT13892VLEVBEJ
厂商: Freescale Semiconductor
文件页数: 114/158页
文件大小: 0K
描述: KIT EVAL FOR MC13892
标准包装: 1
主要目的: 电源管理和用户界面
嵌入式:
已用 IC / 零件: MC13892
主要属性: 10 位 ADC,4 输出降压转换器,12 LDO
次要属性: 与 i.MX51、i.MX37、i.MX35、i.MX27 一起使用
已供物品: 板,线缆,文档
FUNCTIONAL DEVICE OPERATION
LIGHTING SYSTEM
Table 103. USB OTG Specifications
Parameter
VBUS Input Impedance
UID 220K Pull-up (89)
UID Pull-up (89)
UID Parallel Pull-up (89)
Condition
As A_device
IDPUCNTRL = 0, Resistor to VCORE
IDPUCNTRL = 1, Current source from VCORE
ID100KPU = 1, Resistor to VCORE
Min
40
132
4.75
60
Typ
-
220
5.0
100
Max
100
308
5.25
140
Units
k Ω
k Ω
μ A
k Ω
Notes
89. Note that the UID Pull-ups are not mutually exclusive of each other; they are independently controlled by their enable bits and thus
multiple pull-ups can be engaged simultaneously.
LIGHTING SYSTEM
The lighting system includes backlight drivers for main display, auxiliary display, and keypad. The backlight LEDs are
configured in series. Three additional drivers are provided for RGB or general purpose signaling.
BACKLIGHT DRIVERS
The backlight drivers LEDMD, LEDAD and LEDKP are independent current sink channels. Each driver channel features
programmable current levels via LEDx[2:0] as well as programmable PWM duty cycle settings with LEDxDC[5:0]. By a
combination of level and PWM settings, the backlight intensity can be adjusted, or a soft start and dimming feature can be
implemented. The on period of the serial LED backlight drivers will be adapted to take into account that the serial LED switcher
startup time is longer than one half the minimum of the period of the backlight drivers.
When applying a duty cycle of less than 100% the backlight drivers will be turned on and off at a repetition rate high enough
to avoid flickering and or beat frequencies with the different types of displays. Also, to avoid high frequency spur coupling in the
application, the switching edges of the output drivers are softened.
The current level is programmable in a low range mode and in a high range mode through the LEDxHI bit. This facilitates the
current setting, in case two or more serial LED strings are connected in parallel to the same driver or when using super bright
LEDs.
Table 104. Backlight Drivers Current Programming
LEDx[2:0] (90)
LEDx Current Level (mA)
LEDxHI = 0 LEDxHI = 1
000
001
010
011
100
101
110
111
0
3
6
9
12
15
18
21
0
6
12
18
24
30
36
42
Notes
90. “x Represents MD, AD and KP
MC13892
Analog Integrated Circuit Device Data
114
Freescale Semiconductor
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