参数资料
型号: MC34708VM
厂商: Freescale Semiconductor
文件页数: 86/159页
文件大小: 0K
描述: IC POWER MANAGEMENT 206MAPBGA
标准包装: 160
应用: 通用
电源电压: 1.8 V ~ 4.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 206-LFBGA
供应商设备封装: 206-MAPBGA(13x13)
包装: 托盘
Functional Block Description
7.8.3
General Purpose LED Drivers
To turn on the LEDs, the following bits must be set, CHRLEDxEN = 1, CHRGLEDOVRD =1, THERM bit = 1, and programming
the duty cycle > 0/32.
Table 81. LED Driver Control
THERM
x
1
0
CHRGLEDxEN (68)
0 (default)
x
1
0
CHRGLEDOVRD
0
x
1
1
CHRGLEDx (68)
Off
Off
On
Off
Notes
68. “x” represents R or G
The general purpose LED drivers, CHRGLEDR, and CHRLEDG are independent current sink channels. Each driver channel
features programmable current levels via CHRGLEDx[1:0], as well as programmable PWM duty cycle settings with
CHRGLEDxDC[5:0]. By a combination of level and PWM settings, each channel provides flexible LED intensity control.
Table 82. General Purpose LED Drivers Current Programming
CHRGLEDx[1:0]
00
01
10
11
CHRGLEDx Current Level (mA)
3.5
7.0 (default)
10
12
“x” represents for R, and G
Table 83. General Purpose LED Drivers Duty Cycle Programming
CHRGLEDxDC[5:0]
000000
000001
010000
011111
1xxxxx
Duty Cycle
0/32, Off
1/32
16/32
31/32
32/32, Continuously On
“x” represents R, and G
The general purpose LED drivers include ramp up and ramp down patterns implemented in hardware. Ramping is enabled for
each of the drivers using the corresponding CHRGLEDxRAMP bits, only when the repetition rate is 256 Hz.
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 the SPI
when CHRGLEDxRAMP = 0, the change is immediate rather than spread out over a PWM sweep.
In addition, programmable blink rates are provided. Blinking is obtained by lowering the PWM repetition rate of each of the drivers
through CHRGLEDxPER[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.
MC34708
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
86
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