参数资料
| 型号： | SC900841JVKR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 86/192页 |
| 文件大小： | 0K |
| 描述： | IC POWER MGT 338-MAPBGA |
| 标准包装： | 2,000 |
| 应用： | PC，PDA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 338-TFBGA |
| 供应商设备封装： | 338-MAPBGA |
| 包装： | 带卷 (TR) |
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FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
Operation
VBKLT is not independent and cannot be operated with
another load, however the backlight LEDs can be operated
without VBKLT.
When supplying only the LCD backlight or both loads,
VBKLT uses the lowest voltage of WLED1, WLED2, WLED3,
or LEDSCN (if used for backlight support and/or S4ADAPT
bit in register FSLVBKLTADAPT is set) as its reference
voltage for output voltage regulation. This method assures
the string with the highest drop (lowest voltage) has enough
voltage headroom to operate, and the minimum output
voltage (maximum forward voltage drop across LED strings +
voltage headroom necessary to operate the current sinks) is
set at the minimum value necessary to drive all LED strings,
which reduces power dissipation. If the 4th string is used for
Table 41. VBKLT Reference Selection
camera scene illumination application, then it does not
control the output voltage VBKLT.
When supplying only the camera scene illumination string,
the output voltage of VBKLT is fixed to 22 V, and uses a fixed
reference voltage.
By setting the TWOPTWO bit in the FSLVBKLTCNTL, the
900841 can support an independent zone backlighting
option, where strings 1 and 2 support one display backlight,
and strings 3 and 4 (Camera scene) support another display.
Both string groups are completely independent in terms of
frequency and duty cycle control. They are both still supplied
from the VBKLT rail.
This reference voltage selection is controlled by the
MLED1EN, MLED2EN, MLED3EN, MLED4EN, and
MLED1EN
0
0
0
0
x
1
x
x
MLED2EN
0
0
0
0
x
x
1
x
MLED3EN
0
0
0
0
x
x
x
1
MLED4EN
0
0
0
1
1
x
x
x
SLEDEN
0
1
1
0
1
x
x
x
S4ADAPT
0
0
1
x
x
x
x
x
VBKLT Voltage
Reference
OFF
Fixed
Adaptive
Invalid
Adaptive
Adaptive
Adaptive
Adaptive
The LED current sinks, WLED1-3, can be used as PWM
outputs by providing a pull-up to a supply, such as 3.3 V.
These PWM outputs can be used to drive an "Integrated
Display" with local power supply. In this case, and in the
event camera scene illumination is not needed either, then
VBKLT is not used and the current sinks are enabled by the
PWMEN signal. This signal only enables the current sinks
and not VBKLT
VBKLT cannot drive LED(s) with a total minimum forward
voltage drop of less than the maximum battery voltage.
VBKLT cannot be discharged due to the lack of an
isolation FET (the output is directly connected to the input
through the inductor and the external diode). VBKLT however
limits the LED leakage current in the off state through the
internal current sinks.
VBKLT can support higher number of LEDs in series, with
an applications work-around. Reference the Freescale's
Evaluation Board KITINTMIDPMMEVBE schematics or
discuss with your Freescale representative for more details.
VBKLT Enable Control
Table 42 outlines different cases for VBKLT operation,
depending on the display type used and the loads being
supplied.
Note that the 4th string cannot be operated for backlighting
unless the camera scene enable bit (SLEDEN) is asserted.
Also, in order for the 4th string to have the ability to turn on
VBKLT, SLEDEN has to be asserted.
In summary, in order for MLED4EN to have any effect,
SLEDEN has to also be asserted. This holds true in all of the
Table 42 outlines the relation between the different enable
bits, the status of VBKLT, and the application mode
supported. An “x” in the MLEDxEN column refers to strings 1,
2, and 3.
Table 42. Backlight and Camera Scene LED Enable Bits Control
PWMEN
0
0
MLEDxEN
0
0
TWOPTWO
x
0
SLEDEN
0
1
MLED4EN
x
0
VBKLT
OFF
ON
String 1-3
OFF
OFF
String 4
OFF
Camera Scene
900841
Analog Integrated Circuit Device Data
86
Freescale Semiconductor
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