Datasheet STUSB4500L (STMicroelectronics) - 10

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STUSB4500L Dead battery mode
The discharge time durations are also preset by default in the NVM (see Section 7.3 Electrical and timing characteristics). The discharge time durations can be changed through NVM programming (see Section 5 Start- up configuration). The VBUS discharge feature is enabled by default in the NVM and can be disabled through NVM programming (see Section 5 Start-up configuration).
3.2.3 VBUS power path assertion
The STUSB4500L can control the assertion of the VBUS power path from the USB Type-C receptacle, directly or indirectly, through the VBUS_EN_SNK pin. The table below summarizes the operating conditions that determine the electrical value of the VBUS_EN_SNK pin during system operation.
Table 7. VBUS_EN_SNK pin behavior depending on the operating conditions Operating conditions Value Connection stage VBUS monitoring conditions on VBUS_VS_DISCH pin
VBUS < VMONUSBH 0 At attachment or during operation and VBUS > VTHUSB VBUS > VMONUSBH Hi-Z At detachment or during ErrorRecovery or VBUS < VTHUSB Type-C state column refers to the Type-C FSM states as defined in the USB Type-C standard specification.
3.3 Dead battery mode
Dead battery mode allows systems powered by a battery to be supplied by the VBUS when the battery is discharged and therefore to start the battery charging process without any external support. This mode is also used in systems that are powered through the VBUS only. Dead battery mode operates only if the CC1DB and CC2DB pins are connected respectively to the CC1 and CC2 pins. Thanks to these connections, the STUSB4500L presents a pull-down termination on its CC pins and advertises itself as a sink even if the device is not supplied. When a source system connects to a USB Type-C port, it detects the pull-down termination, establish the source- to-sink connection, and provide the VBUS. The STUSB4500L is then supplied thanks to the VDD pin connected to VBUS on the USB Type-C receptacle side. The STUSB4500L can finalize the connection and enable the power path on VBUS thanks to the VBUS_EN_SNK pin to allow the system to be powered.
3.4 High voltage protections
The STUSB4500L can be safely used in systems or connected to systems that handle high voltage on the VBUS power path. The device integrates an internal circuitry on the CC pins that tolerates high voltage and ensures protection up to 22 V in case of unexpected short-circuits with the VBUS or in case of a connection to a device supplying high voltage on the VBUS.
3.5 Hardware fault management
During system operation, the STUSB4500L handles some pre-identified hardware fault conditions. When such conditions happen, the circuit goes into an ErrorRecovery state as defined in the USB Type-C standard specifications.
DS13102
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Rev 2 page 10/32
Document Outline Cover image Product status link / summary Product status link / summary Features Applications Description 1 Functional description 1.1 Block overview 2 Inputs/outputs 2.1 Pinout 2.2 Pin description 2.2.1 CC1 / CC2 2.2.2 CC1DB / CC2DB 2.2.3 RESET 2.2.4 I²C interface pins 2.2.5 DISCH 2.2.6 GND 2.2.7 ATTACH 2.2.8 RP_3A/RP_1A5 2.2.9 GPIO 2.2.10 VBUS_EN_SNK 2.2.11 A_B_SIDE 2.2.12 VBUS_VS_DISCH 2.2.13 VREG_1V2 2.2.14 VSYS 2.2.15 VREG_2V7 2.2.16 VDD 3 Description of the features 3.1 CC interface 3.2 VBUS power path control 3.2.1 VBUS monitoring 3.2.2 VBUS discharge 3.2.3 VBUS power path assertion 3.3 Dead battery mode 3.4 High voltage protections 3.5 Hardware fault management 3.6 Debug accessory mode detection 4 I²C Interface 4.1 Read and write operations 4.2 Timing specifications 5 Start-up configuration 5.1 User-defined parameters 5.2 Default start-up configuration 6 Application 6.1 General information 6.1.1 Power supplies 6.1.2 Connection to MCU or application processor 6.2 Typical application 7 Electrical characteristics 7.1 Absolute maximum ratings 7.2 Operating conditions 7.3 Electrical and timing characteristics 8 Package information 8.1 QFN-24 EP (4x4) package information 8.2 WLCSP (2.6x2.6x0.5) 25 bumps package information 8.3 Thermal information 9 Terms and abbreviations Revision history