SC900841JVKR2 Freescale Semiconductor, SC900841JVKR2 Datasheet - Page 85

• 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

VBKLT
mode control DC/DC regulator with an internal low side FET.
as part of the 900841 LED support:
• 3 strings at up to 5 LEDs per string (3P5S) for LCD
• 1 string of up to 5 LEDs (1P5S) capable of up to 30 mA for
expand the backlight support to 4 strings of up to 5 LEDs
each (4P5S).
backlighting option, each supported by two strings. Both
backlight displays are completely independent
cannot be operated with any other load, i.e. VBKLT is
Table 40. VOTG Status and Control Registers Structure and Bits Description
Analog Integrated Circuit Device Data
Freescale Semiconductor
VOTGDISDSCH
This is a 2.0 MHz non-synchronous Boost PWM current
VBKLT supplies two different loads (see
backlights. Each string is capable of up to 30 mA.
camera scene illumination support.
The Camera Scene Illumination string can be used to
The 900841 can also support an independent zone
VBKLT is dedicated to support the prior two loads and
Reserved
Or Backlight 4
White LEDs String
Camera Scene
5s1p
C
OBKLT
th
String
V
7:1
OBKLT
0
VOTG Discharge FET Disable Signal
x0 = Discharged enabled
x1 = Discharged disabled
Reserved
FSLVOTGCNTL1 (ADDR 0x1C5 - R/W - Default Value: 0x01)
White LEDs Strings
Figure 40. VBKLT Detailed Internal Block Diagram
D
BKLT
Backlight
5s3p
L
BKLT
Lighting
V
PWR
PGNDBKLT
FBBKLT
SWBKLT
LEDSCN
WLED1
WLED2
WLED3
C
System)
INBKLT
R
Current Sink 1
Current Sink 2
Current Sink 3
Camera Scene
Illumination LED
Current Sink
SENSE
Internal
Compensation
V
Z1
REF
V
V
V
REFOV
REFUV
V
REFSC
REF_OP
enabled only when one or both of the prior two loads is
enabled.
running, to minimize the voltage headroom across the
backlight LED current sinks, which in turn reduces power
dissipation and saves on overall efficiency. When only
operating the camera scene illumination LEDs, the VBKLT
output voltage is set to a fixed 22 V output. If the Camera
scene string is selected as part of backlight operation, then it
can also be selected as part of the adaptive boost control.
reduce the amount of transient current on the output of
VBKLT and inrush current from the battery.
protection, open LED protection, short-circuit and over-
current protection
Driver
EA
It contains adaptive boost control when backlight LEDs are
PWM signals for the backlight strings are staggered to
VBKLT includes under-voltage detection, over-voltage
Z2
OC
SC
OV
UV
Gen .
OPLED 1
V
REF
OPLED 2
OPLED 3
Controller
OPLED 4
V
SLEDEN
COREREF
MBKLT 4EN
Reference Selection
V
LEDSCN
FUNCTIONAL DEVICE OPERATION
MBKLT3EN
V
WLED3
MBKLT2EN
V
VBKLTFAULT
WLED2
MBKLT 1EN
MBKLT 2EN
MBKLT 3EN
MBKLT1EN
BKLTFREQ
MBKLT4EN
BKLTBRT
V
PWMEN
SLEDEN
SILTBRT
WLED1
Interface
POWER SUPPLIES
SPI
900841
85