SC900841JVKR2 Freescale Semiconductor, SC900841JVKR2 Datasheet - Page 114

• Manufacturer Part Number: SC900841JVKR2
• Description: IC POWER MGT 338-MAPBGA
• Manufacturer: Freescale Semiconductor

Specifications of SC900841JVKR2

• Applications: PC's, PDA's
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 338-TBGA
• Input Voltage: 2.8 V to 4.4 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Backlight LED drivers, a Camera Scene Illumination LED
driver, and general purpose LED drivers.
LCD BACKLIGHT DRIVERS
LEDs each for LCD backlighting. The strings are powered
from the VBKLT DC/DC boost regulator. The brightness
control is done through 8-bit PWM duty cycle control and 3-
bit PWM frequency control.
be limited to 2.0 ms
DPST power savings architecture. The duty cycle change
from the previous value will be typically <1%. Dynamic
display duty cycle changes are made as frequently as every
100 ms, or 6 frames. The new duty cycle takes effect at the
start of the next PWM cycle change. Refer to
block diagram of how the backlight LED current sinks
interface with VBKLT.
114
Table 71. LCD Backlight Drivers Brightness Control PWM Frequency Selections
900841
FUNCTIONAL DEVICE OPERATION
LIGHTING SYSTEM
The lighting system of the 900841 is comprised of LCD
900841 supports up to four parallel strings with up to 5-6
Note: The minimum on time of the backlight LEDs should
The backlight control resolution is needed to support
Bit2
0
0
0
0
1
1
1
1
Reg N
Bit1
0
0
1
1
0
0
1
1
Bit0
0
1
0
1
0
1
0
1
Figure 61. PWM and Duty Cycle Functionality for Backlight Current Sinks
32.768 kHz divided
256
128
by
64
32
16
8
4
Figure 40
PWM Freq [reg N]
LIGHTING SYSTEM
for a
1024
2048
4096
8192
(Hz)
128
256
512
Table 70. LCD Backlight Drivers Brightness Control PWM
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
a pull-up resistor as a PWM output signal to drive an
"Integrated Display".
0
0
0
0
1
.
.
.
Each one of the Backlight current sinks could be used with
0
0
0
0
1
Period (s)
.
.
.
0.007813
0.003906
0.001953
0.000977
0.000488
0.000244
0.000122
RSVD
Duty Cycle Selections
0
0
0
0
1
.
.
.
REG M
0
0
0
0
1
.
.
.
0
0
0
0
1
.
.
.
Analog Integrated Circuit Device Data
Min on time (s)
Duty cycle [reg
3.06 e-05
1.53 e-05
7.66 e-06
3.83 e-06
1.91 e-06
9.57 e-07
4.79 e-07
0
1
0
0
0
.
.
.
M=0]
0
0
1
1
1
.
.
.
Freescale Semiconductor
0
1
0
1
1
.
.
.
clocks
Min on time (μs)
N*256
M# of
256
1
2
3
4
.
.
.
30.64
15.32
7.66
3.83
1.91
0.96
0.48
100.00%
0.39%
0.78%
1.17%
1.56%
cycle
Duty
.
.
.