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STUSB4700 bảng dữ liệu(PDF) 11 Page - STMicroelectronics

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STUSB4700 bảng dữ liệu(HTML) 11 Page - STMicroelectronics

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STUSB4700
Block descriptions
DocID030193 Rev 2
11/32
The policy engine interprets the device policy manager’s input in order to implement policy
for port and directs the protocol layer to send appropriate messages.
3.5
Device policy manager
The device policy manager is managing the power resources.
3.6
VBUS power path control
3.6.1
VBUS monitoring
The VBUS monitoring block supervises (from the VBUS_SENSE input pin) the VBUS voltage
on the USB Type-C receptacle side.
This block is used to check that VBUS is within a valid voltage range:
To establish a valid source-to-sink connection according to USB Type-C standard
specification
To enable safely the VBUS power path through VBUS_EN_SRC pin
It allows detection of unexpected VBUS voltage conditions such as undervoltage or
overvoltage relative to the valid VBUS voltage range. When such conditions occur, the
STUSB4700 reacts as follows:
At attachment, it prevents the source-to-sink connection and the VBUS power path
assertion
After attachment, it deactivates the source-to-sink connection and disables the VBUS
power path. The device goes into error recovery state.
The VBUS voltage value is automatically adjusted at attachment and at each PDO transition.
The monitoring is then disabled during T_PDO_transition (default 280 ms changed through
NVM programming). Additionally, if a transition occurs to a lower voltage, the discharge
path is activated during this time.
The valid VBUS voltage range is defined from the VBUS nominal voltage by a high threshold
voltage and a low threshold voltage whose minimal values are respectively VBUS+5% and
VBUS-5%. The nominal threshold limits can be shifted by a fraction of VBUS from +1% to
+15% for the high threshold voltage and from -1% to -15% for the low threshold voltage.
This means the threshold limits can vary from VBUS+5% to VBUS+20% for the high limit and
from VBUS-5% to VBUS-20% for the low limit.
The threshold limits are preset by default in the NVM with different shift coefficients (see
Section 8.3: "Electrical and timing characteristics"). The threshold limits can be changed
independently through NVM programming (see Section 4: "User-defined startup
configuration") and also by software during attachment through the I2C interface (see
Section 6: "I²C register map").
3.6.2
VBUS discharge
The monitoring block handles also the internal VBUS discharge path connected to the
VBUS_SENSE input pin. The discharge path is activated at detachment, or when the
device goes into the error recovery state (see Section 3.8: "Hardware fault management").
The VBUS discharge path is enabled by default in the NVM and can be disabled through
NVM programming only (see Section 4: "User-defined startup configuration"). Discharge
time duration (T_PDO_transition and T_Transition to 0 V) are also preset by default in the
NVM (see Section 8.3: "Electrical and timing characteristics"). The discharge time duration
can be changed through NVM programming (see Section 4: "User-defined startup
configuration") and also by software through the I2C interface (see Section 6: "I²C register
map").


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