STW4810CRAE/LF ST-Ericsson Inc, STW4810CRAE/LF Datasheet - Page 36

• Manufacturer Part Number: STW4810CRAE/LF
• Description: IC PWR MNGMNT MULTIMEDIA 84VFBGA
• Manufacturer: ST-Ericsson Inc

Specifications of STW4810CRAE/LF

• Applications: Processor
• Current - Supply: 170µA
• Voltage - Supply: 2.7 V ~ 4.8 V
• Operating Temperature: -30°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 84-VFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STw4810
4.3.2
Note:
4.3.3
VCORE regulator: DC/DC step-down regulator
This regulator drives the core of the multimedia processor. VCORE is a DC/DC step-down
regulator that generates the regulated power supply with very high efficiency. The 15 voltage
levels enable dynamic voltage and frequency scaling suitable for any supply voltage of
CMOS process, they also follow the processor process roadmap. The regulated output
voltage levels are adjustable by the power control registers (
interface (SDA, SCL).
The master clock (13, 19.2 or 26 MHz) is automatically detected, squared and divided to
generate the switching clock of the SMPS. When this clock is not available, regulators run
the internal RC oscillator.
The DC/DC step-down regulator has the following main features;
●
●
The definition of sleep mode is given in section
●
●
●
VIO_VMEM regulator: DC/DC step- down regulator
VIO_VMEM step-down regulator has the same structure than VCORE.
The VIO_VMEM regulator supplies the IOs of the multimedia processor and its peripherals.
This regulator can be used to supply the memories working with the multimedia processor,
such as DDR-SDRAM. A switched mode power supply - voltage down converter is used to
generate the 1.8 V regulated power supply with very high efficiency.
The master clock (13, 19.2 or 26 MHz) is automatically detected, squared and divided to
generate the SMPS switching clock. When this clock is not available, regulators can run the
internal RC oscillator.
Main features
●
●
Programmable output voltage, 15 levels from 1.0 V to 1.5 V (VCORE_SEL [3:0] bits of
power control register -
3 power domains:
–
–
‘Power down mode’ or ‘standby mode’ when regulator is switched off, no consumption
(EN_VCORE bit of power control register -
Soft start circuitry at start up, from power off to normal mode, when PON ball changes
from “0” to “1”.
Default setting defined by start-up configuration.
Fixed 1.8 V output voltage
Two power domains:
–
–
‘Normal mode’ when multimedia processor is in run mode, 600 mA full load
‘Low current mode’ when multimedia processor is in sleep mode, 5 mA current
capability.
Fast switching from low current to normal mode.
The regulator is in ‘low current mode’ when multimedia processor is in sleep
mode. PWREN signal indicates that the multimedia processor is about to switch to
run mode. VDDOK signal indicates to the multimedia processor that all supplies
are in the specified range.
‘Normal mode’ when multimedia processor is in run mode - 600 mA full load
‘Low current mode’ when multimedia processor is in sleep mode, 5 mA current
capability.
Table 22
)
4.2.3: Sleep
Table 28
)
mode.
Table 22
Functional description
), via the main I2C
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