参数资料
| 型号： | SC900841JVKR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 63/192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 STATES AND CONTROL
No Power State
In this state, every source of power has been removed or
is fully depleted:
? V RAWCHG < V RAWCHGDET : The charger input is not
available or is below the detection threshold
? V BAT < V BATOFF : The main battery has been removed or
has been isolated by its own protection circuitry to stop it
from depleting even further
? V COIN < V COINOFF : The coin cell backup battery has been
removed or has been isolated by the 900841 coin cell
The 900841 has lost any source of power to maintain the
RTC and its keep alive registers, and all circuitry will power
down and time of day cannot be kept.
RTC State
If one of the following two conditions is satisfied, then
SC900841 goes from the No Power State to the RTC State:
1. V RAWCHG > V RAWCHGDET : A charger input is valid and
has been detected.
2. V BAT > V BATOFF : A main battery has been inserted with
a valid voltage range.
If either of the previous two conditions occur, the V BOS is
available and will route the power to the V CORERTC and the
Keep Alive bandgap. As a result, the RTC is powered, Time
During this mode the main battery is isolated and all other
circuits are off. SCU cannot be powered up.
In order to route the power from the RAWCHG node to the
PVINCHG node, which is one of the supplies to the Best of
The key to entering the active state is a valid V PWR
voltage. The following examines how the 900841 ramps up
V PWR depending on the available power source:.
V PWR RAMP UP
One of the following two conditions causes a VPWR ramp
up sequence:
1. V RAWCHG > V RAWCHGDET : A charger input is valid and
has been detected. Note that this is the same condition
for an RTC state. This means that if this condition
occurs, the device goes through the RTC state, then
directly into a VPWR ramp up sequence to try and get
to the active state (see Figure 18 for more details).
2. V BAT > V LOWBAT : The main battery voltage is above the
V LOWBAT threshold of 3.2 V.
For number 1, the Buck Charger turns on and regulates
V PWR to a voltage that depends on the state of the battery:
? If V BAT < V TRICKLE , then V PWR = 4.2 V
? If V BAT > V TRICKLE , then V PWR = V BAT + 0.3 V
For number 2, the Buck charger stays off, and the MCHG
and MCHGBYP FETs turn on to short the battery voltage with
the V PWR node. Note that number 2 implies that the charger
input is not present or is not valid.
After V PWR crosses the under-voltage rising detection
threshold (V PWRUVR ) of 3.0 V, the internal supplies power on,
the logic is reset, initial power sequence is performed, SPI
communication is ready, and the Platform controller hub is
interrupted. The system is now completely under SCU
control. Now it is in the active state.
In the active state, the following types of operations are
possible. Note that for simplicity, a valid charger input
operation is called the USB Operation:
Supply circuitry, MOVPCHG and MREVPCHG have to turn
on upon valid charger input voltage detection. See Battery
During this mode no turn on is accepted. The only blocks
operational are:
? The charger interface (monitoring of the charger input
voltage)
? RTC module
? Keep alive registers
No specific power control timer is running in this mode. All
main and external supplies are off. The Platform controller
hub will also be off by virtue of the loss of its supply source.
The 900841 stays in this state as long as the previous two
conditions are satisfied, and V PWR is below its rising
threshold V PWRUVR
Active State
In this state the 900841 internal circuits are fully powered,
the Platform controller hub SCU and I/Os are powered, and
SPI communication is available. All features of the 900841
are either operating or can be enabled, which is under the
control of the Platform controller hub.
1.
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2.
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3.
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Battery Operation
V BAT > V LOWBAT and V RAWCHG < V RAWCHGDET .
V PWR = V BAT
MCHG and MCHGBYP are ON, shorting the battery
with the VPWR node
MOVPCHG and MREVPCHG are OFF, isolating the
charging input from the battery
Charging is not possible
OTG host mode operation is possible
Note: If OTG host mode operation is enabled, the
USBDET Interrupt flag is ignored.
USB Operation
V RAWCHG > V RAWCHGDET and V BAT < V TRICKLE .
V PWR = 4.2 V
MCHG and MCHGBYP are OFF, isolating the battery
MOVPCHG and MREVPCHG are ON
Charging is possible
OTG host mode operation is not possible
USB + Battery Operation
V RAWCHG > V RAWCHGDET and V BAT > V TRICKLE .
V PWR = V BAT + 0.3 V
MCHG and MCHGBYP are OFF, isolating the battery
900841
Analog Integrated Circuit Device Data
Freescale Semiconductor
63
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