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STUSB4700 bảng dữ liệu(PDF) 11 Page - STMicroelectronics |
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STUSB4700 bảng dữ liệu(HTML) 11 Page - STMicroelectronics |
11 / 32 page 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"). |
Số phần tương tự - STUSB4700 |
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Mô tả tương tự - STUSB4700 |
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