STW4811M STMicroelectronics, STW4811M Datasheet - Page 47

• Manufacturer Part Number: STW4811M
• Description: Power Management For Multimedia Processors
• Manufacturer: STMicroelectronics

STw4811M/STw4811N
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
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:
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●
●
These three bits generate an interrupt when active (see USB interrupt registers (
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:
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●
●
This detection generates interrupts (see USB interrupt registers (
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 (
Pull up and pull down resistors: Configurable integrated pull-up and pull-down resistor of
data line and VBUS (see USB control register 2 (
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
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.
Table 13
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Table 12
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Table 13
Table 28
Functional description
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Table 13
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