STW4810CRAT/LF ST-Ericsson Inc, STW4810CRAT/LF Datasheet - Page 47

• Manufacturer Part Number: STW4810CRAT/LF
• Description: IC PWR MNGMNT MULTIMEDIA 84VFBGA
• Manufacturer: ST-Ericsson Inc

Specifications of STW4810CRAT/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

Functional description
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At the start of a session, the A-device has the role of host as default. During a session, the
host role can be transferred back and forth between the A-device and the B-device any
number of times using the Host Negotiation Protocol (HNP). The process for this exchange
of host role is described in the “On the Go Supplement to the USB 2.0 Specification” (rev
1.0).
ID detector
In either active or suspended power mode, the ID detector detects the condition of the ID
line and differentiates between the following three conditions:
The transceiver pulls the ID ball to VID_HI (VBAT) through a resistance of RID_PU when an
accessory is plugged in. In this case, the ID ball is externally connected to ground via
Racc_ID resistor.
Two comparators are used to detect the ID voltage: VID_GND and VID_FLOAT.
The ID detector also has a switch that can be used to ground the ID ball. This switch is
controlled by id_gnd bit of USB control register 2 (
CEA_KARKIT purposes.
Car kit interrupt detector
The transceiver is able to detect when the DP line is below the Carkit Interrupt threshold
‘cr_int’, (see USB interrupt register) (refer to OTG specifications, Rev 0.92, §2.7, p13).
Charge pump
From VBAT_USB, the charge pump supplies VBUS, ‘vbus_drv’ bit of USB control register 2
(
LDO USB
From VBAT_USB, a LDO provides VUSB supply, ‘usb_en’ bit of USB_EN register (
is used to enable/disable the VUSB LDO.
Table 12
Host Negotiation Protocol (HNP)
–
–
–
) is used to enable/disable the charge pump.
ID ball floating: (e.g. with USB B-device connected)
ID ball shorted to ground: (e.g. with USB A-device connected)
ID ball connected to ground through resistor RACC_ID: (e.g.with an accessory).
Table 12
); This pull-down is used for
STw4810
Table 17
)