参数资料
型号: KIT13892VLEVBEJ
厂商: Freescale Semiconductor
文件页数: 116/158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 106. Serial LED Driver Characteristics
Parameter (92)
Output Current Setting
Current Programming Granularity
PWM Granularity
Repetition Rate
Absolute Accuracy
Matching
Glow and Dimming Speed
Condition
Low Range Mode
High Range Mode
Low Range Mode
High Range Mode
Not blinking
At 400 mV, 21 mA
Per 1/32 duty cycle step
Min
0.0
0.0
Typ
3.0
6.0
1/32
256
1/64*
Max
15
30
15
3.0
Units
mA
mA
Hz
%
%
S
Notes
92. Equivalent to 500 ms ramp time when going from 0/32 to 32/32
Figure 34 illustrates some possible configurations for the backlight driver. Note that when parallel strings are ganged together
on a driver channel, ballasting resistance is recommended to help balance the currents in each leg.
External
Boost
External
Boost
External
Boost
LEDMD
LEDKP
LEDMD
LEDAD
LEDMD
LEDAD
LEDKP
6 LED Main Display
9 LED Keypad
6 LED Main Display
3 LED Aux Display
6 LED Main Display
12 LED Keypad Arrangement
2 LED Reduced Keypad Option
Figure 34. Serial LED Configurations
In the left most example in Figure 34 : LEDMD is set at 15 mA (low range), LEDKP is set at 30 mA (high range). When both
are operated, then the LEDMD current will pulse at 30 mA and the LEDKP current at 60 mA. This provides an average of 15 mA
through the main display backlight LEDs and 30 mA through the keypad backlights LEDs.
SIGNALING LED DRIVERS
The signaling LED drivers LEDR, LEDG, LEDB 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 both, the LED intensity can be adjusted. By driving LEDs of different colors, color mixing can be achieved.
MC13892
Analog Integrated Circuit Device Data
116
Freescale Semiconductor
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