参数资料
型号: SC900841JVKR2
厂商: Freescale Semiconductor
文件页数: 82/192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
VYMXPA Status/Control Registers and Bits Description
(Freescale Defined)
Reference the register map for read/write conditions and
default state for each of these registers
Table 38. FSLVYMXPACNTL Register Structure and Bits
Description
M OTG enable is controlled through the CHRG and OTGB bits
in the CHRGCNTL register. Reference Active State for more
details into when the OTG host mode is enabled and M OTG is
enabled. OTG host mode is only possible when under battery
operation and no input power is connected. When OTG host
mode is enabled, the USBDET interrupt flag is ignored.
If OTG support is not needed, this switch does not need to
Name
Bits
Description
be populated, reducing the overall system cost, while the
OTGGTIN and OTGGT pins are grounded
FSLVYMXPACNTL (ADDR 0x1C7 - R/W - 0x01)
The rest of the VOTG load consists of a total of 6 LED
VYMXPADISDSCH
Reserved
0
7:1
VYMXPA Discharge FET Disable Signal
x0 = Discharged enabled
x1 = Discharged disabled
Reserved
drivers at 30 mA maximum each. These LED drivers may
turn on one at a time, at different drive values, or they may all
turn on together at the maximum driver value for each. Close
attention to VOTG transient response is in order here, to
account for these possible load changes.
VOTG
This is a 2.0 MHz non-synchronous Boost PWM current-
mode control DC/DC regulator with internal low side FET.
VOTG provides a fixed 5.0 V output voltage and capability to
supply up to 350 mA of drive current. It can be used
separately to support many applications that need a 5.0 V
supply voltage, as in motor drives. The following are the
typical loads for VOTG in SC900841 application
? Signaling/Status LED Drivers, See Lighting System .
? USB Bus (VBUS) while 900841 is operating in host mode
as part of an UBS On-The-Go (OTG) System.
VOTG allows the 900841 the capability to support host
mode in USB-OTG systems. It offers the capability of up to
100 mA to supply to the USB Bus (VBUS). Due to the need
to isolate the USB Bus from the rest of the system when not
in use, an external PMOS switch (M OTG ) will be used to
switch in a VOTG output to VBUS, as shown in Figure 16 .
V PWR
If OTG host mode is not used, M OTG can still be used as
an isolation switch. When M OTG is used, then users can
either connect the feedback node after or before the switch.
Accuracy is maintained where the feedback node is
connected. The output capacitor C OOTG can also connect to
either node, but is recommended to follow the feedback node
connection.
VOTG can be discharged only if M OTG is used and the
feedback node is taken after the switch. The discharge FET
is connected internally to the FBOTG pin. If M OTG is not used,
then the discharge FET should be disabled by setting the
VOTGDISDSCH bit, since VOTG cannot be discharged due
to the lack of an isolation FET (the output is directly
connected to the input through the inductor and an external
diode).
VOTG includes under-voltage, over-voltage, over-current,
and short-circuit protection.
L OTG
C INOTG
V OOTG
D OTG
SWOTG
Driver
CTLVOTG
AOACCTLVOTG
PGNDOTG
OTGGTIN
R SENSE
V REFSC
V REFUV
V REFOV
OC
SC
UV
OV
Controller
VOTGDISDSCH
VOTGFAULT
SPI
Interface
Optional Isolation Switch
If not used then
Connect OTGGTIN and OTGGT to GND
Then short V OOTG to FBOTG pin
OTGGT
FBOTG
Driver
C OOTG
Load
Internal
Compensation
Z1
Z2
EA
V REF
Discharge FET
Figure 38. VOTG Detailed Internal Block Diagram (Using OTG Host Mode)
900841
Analog Integrated Circuit Device Data
82
Freescale Semiconductor
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