SC900841JVK Freescale Semiconductor, SC900841JVK Datasheet - Page 63

• Manufacturer Part Number: SC900841JVK
• Description: IC POWER MGT 338-MAPBGA
• Manufacturer: Freescale Semiconductor

Specifications of SC900841JVK

• 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

No Power State
is fully depleted:
• V
• V
• V
RTC and its keep alive registers, and all circuitry will power
down and time of day cannot be kept.
RTC State
SC900841 goes from the No Power State to the RTC State:
available and will route the power to the V
Keep Alive bandgap. As a result, the RTC is powered, Time
of day is initialized to a factory set value, see
(RTC), and all keep alive registers are maintained.
circuits are off. SCU cannot be powered up.
PVINCHG node, which is one of the supplies to the Best of
Supply circuitry, MOVPCHG and MREVPCHG have to turn
on upon valid charger input voltage detection. See
Interface and Power Path Management
operational are:
• The charger interface (monitoring of the charger input
• RTC module
• Keep alive registers
main and external supplies are off. The Platform controller
hub will also be off by virtue of the loss of its supply source.
conditions are satisfied, and V
threshold V
Active State
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.
Analog Integrated Circuit Device Data
Freescale Semiconductor
1. V
2. V
In this state, every source of power has been removed or
available or is below the detection threshold
has been isolated by its own protection circuitry to stop it
from depleting even further
removed or has been isolated by the 900841 coin cell
discharge prevention circuitry (see
Backup/Charger)
The 900841 has lost any source of power to maintain the
If one of the following two conditions is satisfied, then
If either of the previous two conditions occur, the V
During this mode the main battery is isolated and all other
In order to route the power from the RAWCHG node to the
During this mode no turn on is accepted. The only blocks
voltage)
No specific power control timer is running in this mode. All
The 900841 stays in this state as long as the previous two
In this state the 900841 internal circuits are fully powered,
RAWCHG
BAT
COIN
has been detected.
a valid voltage range.
RAWCHG
BAT
< V
< V
> V
PWRUVR
BATOFF
COINOFF
< V
BATOFF
> V
RAWCHGDET
: The main battery has been removed or
RAWCHGDET
: The coin cell backup battery has been
: A main battery has been inserted with
: The charger input is not
PWR
: A charger input is valid and
is below its rising
Coin Cell Battery
for more information.
CORERTC
Real Time Clock
Battery
and the
BOS
is
voltage. The following examines how the 900841 ramps up
V
V
up sequence:
V
• If V
• If V
and MCHGBYP FETs turn on to short the battery voltage with
the V
input is not present or is not valid.
threshold (V
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.
possible. Note that for simplicity, a valid charger input
operation is called the USB Operation:
PWR
PWR
PWR
1. V
2. V
1. Battery Operation
2. USB Operation
3. USB + Battery Operation
The key to entering the active state is a valid V
One of the following two conditions causes a VPWR ramp
For number 1, the Buck Charger turns on and regulates
For number 2, the Buck charger stays off, and the MCHG
After V
In the active state, the following types of operations are
• V
• V
• MCHG and MCHGBYP are ON, shorting the battery
• MOVPCHG and MREVPCHG are OFF, isolating the
• Charging is not possible
• OTG host mode operation is possible
• Note: If OTG host mode operation is enabled, the
• V
• V
• MCHG and MCHGBYP are OFF, isolating the battery
• MOVPCHG and MREVPCHG are ON
• Charging is possible
• OTG host mode operation is not possible
• V
• V
• MCHG and MCHGBYP are OFF, isolating the battery
PWR
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
V
with the VPWR node
charging input from the battery
USBDET Interrupt flag is ignored.
BAT
BAT
to a voltage that depends on the state of the battery:
depending on the available power source:.
RAMP UP
RAWCHG
BAT
LOWBAT
BAT
PWR
RAWCHG
PWR
RAWCHG
PWR
PWR
node. Note that number 2 implies that the charger
< V
> V
> V
> V
= V
= 4.2 V
= V
PWRUVR
TRICKLE
TRICKLE
LOWBAT
crosses the under-voltage rising detection
LOWBAT
threshold of 3.2 V.
BAT
BAT
> V
> V
> V
RAWCHGDET
RAWCHGDET
RAWCHGDET
+ 0.3 V
) of 3.0 V, the internal supplies power on,
, then V
, then V
: The main battery voltage is above the
and V
FUNCTIONAL DEVICE OPERATION
POWER STATES AND CONTROL
RAWCHG
Figure 18
PWR
PWR
: A charger input is valid and
and V
and V
= 4.2 V
= V
BAT
< V
BAT
BAT
for more details).
RAWCHGDET
+ 0.3 V
< V
> V
TRICKLE
TRICKLE
PWR
.
.
.
900841
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