STW4811N datasheet(53/85 Pages) STMICROELECTRONICS

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STw4811M/STw4811N

Functional description

CD00131784

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4.4.3

USB enable control

STw4811 OFF

In this state: PON ball = 0

In this state, the overall system is able to detect USB connection through IT_WAKE_UP ball

and with VBUS session valid comparator and ID detection ON.

IT_WAKE_UP ball is activated (low level if tied by an external Pull Up resistor to VIO or

VBAT) in either of the two following cases:

●

When a mini A connector cable is connected and ID goes low

●

When activity on VBUS, that is a mini B is connected and is able to communicate.

This mode is used to wake-up the platform. In this configuration, USBINTn ball is not

enabled and IT_WAKE_UP ball cannot be masked by ‘mask_it_wake_up’ bit

(

Table 28).

STw4811 ON, USB driver not enabled

In this state: PON = 1

If ‘mask_it_wake_up’ bit is set to “0”, IT_WAKE_UP ball has the same behavior as above

(PON = 0) and turns ON the transceiver, ‘usb_en’ bit set to “1” (

Table 17).

If ‘mask_it_wake_up’ is set to “1”, IT_WAKE_UP ball feature is disabled and always stay at

level “1” if tied by an external pull up resistor to VIO or VBAT and the transceiver is not turn

ON.

In sleep mode and in HIGH POWER mode, USBINTn ball is now enabled.

If the USB cable is already connected while STw4811 is starting, the USB driver will be

enabled when power management is ready.

●

Wake-up USB driver conditions

–

A plug-in on a mini A-device and active ID detector

–

B device is connected and ready to start data transfer, VBUS is driven high

(session valid high)

–Activity on

USB registers (00h to 0Fh - Table 9 to Table 16). Multimedia processor

ready to wake-up and set-up USB PHY.

–

Possibility to force PHY high (enable) when writing ‘usb_en’ = 1 in USB EN

Table 17)

●

Set condition: one among the following possibilities

–

External it_wake_up =0

–

usb_en = 1 by writing to I2C USB interface

–

Access to any other

USB register (00h to 0Fh)

●

Power down USB driver conditions in order to set the USB driver to power down mode:

–

it_wake_up = 1, and only then

–

Set ‘usb_en’ bit of USB EN register (

Table 17) to “0”

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