STW4811MBRASLASHLF datasheet(48/86 Pages) STMICROELECTRONICS

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STw4811M/STw4811N

Functional description

47/85

Interrupt management

IT_WAKE_UP: with only VBAT supply, no other supply available, when a USB cable is

plugged this interrupt is activated to wake up the host or the modem, depends of application

(open drain, active low).

By default this feature is available independently of PON level, it can be masked when

PON = 1 by ‘mask_it_wake_up’ bit of

configuration 2 register (see Table 28)

USBINTn: This interrupt ball is dedicated to USB protocol and sent to multimedia processor.

Independently of PWREN ball state, this ball goes to low level if an USB interrupt source is

detected. In sleep mode, PWREN = 0, an interrupt source is detected only if unmasked

before PWREN goes to low level.

VBUS monitoring

These comparators monitor the VBUS voltage. They detect the current status of the VBUS

line:

●

VBUS > 4.4 V means A-Device VBUS_Valid

●

0.8 V < VBUS < 2 V means A-Device Session Valid and 0.8 V < VBUS < 4 V means B-

Device Session Valid. To be compatible with both Session Valid threshold, STw4811

threshold is equal to 1.9 V.

●

VBUS < 0.8 V means B_Device Session End

These three bits generate an interrupt when active (see

USB interrupt registers (Table 13)).

VUSB LDO: Internal regulator which provides power supply for the bus driver and receiver.

ID detector: This block detects the status of the ID line. It is capable of detecting three

different states of line:

●

ball is floating ‘id_float’ bit is high, Threshold detection is equal to 0.85 * Vbattery.

●

ball is tied to ground ‘id_gnd_forced’ bit is high, Threshold detection is equal to 0.15 *

Vbattery.

●

ball is grounded via resistor, voltage is between 0.85 * Vbattery and 0.15 * Vbattery.

‘id_float’ and ‘id_gnd_forced’ bits are low.

This detection generates interrupts (see

USB interrupt registers (Table 13)).

Transceiver: The driver can operate in different modes. It can act as a classical low-speed

and full-speed differential driver, as two independent single-ended drivers or as a single-

ended driver in UART mode. This block contains one differential receiver for the USB mode

of operation and two single-ended receivers for USB signaling and UART mode.

DP monitor: This block is used to detect car kit peripheral, ‘cr_int’,0.6 V on DP (see

USB

interrupt registers (Table 13)).

Pull up and pull down resistors: Configurable integrated pull-up and pull-down resistor of

data line and VBUS (see

USB control register 2 (Table 12)).

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