Data Sheet

HUSB238

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Page 11 of 17

DEAD BATTERY FUNCTION

The HUSB238 works as PD sink role which requires RD resistor to be presented on the CC pins even in the un-

powered state for successful Type-C detection by source adapter.

The dead battery function in the HUSB238 supports default USB, 1.5A and 3.0A source broadcast RP current.

S

OP’ FUNCTION

For the USB-C to legacy PC plug applications where high current and high voltage are required, the system needs

current more than 3A in most of the cases. If the SOP’ function is enabled, the HUSB238 is capable to reply SOP’

command, such as Discover Identity, sent by the PD source adapter.

The SOP’ function emulates the E-Marker function in the cable so that the system is capable of obtaining more than

3A charging current from PD source adapter.

OVER-VOLTAGE PROTECTION

The HUSB238 senses the voltage on VIN pin for overvoltage protection. The over-voltage threshold is 1.2 times of

max requested voltage. The OV debounce time is 50μs.

When OV happens, the HUSB238 turns off the external PMOS and enters into discharge mode where the internal

discharge circuit on VIN pin is turned on. The internal 5.1k Rd resistor is also disconnected during discharge mode.

After the discharge timeout, the HUSB238 enters into unattached mode and waits for re-connection with PD source

adapter.

UNDER-VOLTAGE PROTECTION

The HUSB238 senses the voltage on VIN pin for optional under-voltage protection. The under-voltage threshold is the

requested voltage minus 2V. For example, if the requested PDO voltage is 12V, then the UV threshold is 10V. The UV

debounce time is 1ms.

When UV happens, the HUSB238 turns off the external PMOS and enters into discharge mode where the internal

discharge circuit on VIN pin is turned on. The internal 5.1k Rd resistor is also disconnected during discharge mode.

After the discharge timeout, the HUSB238 enters into unattached mode and waits for re-connection with PD source

adapter.

The UVP function of the HUSB238 can be enabled or disabled by internal fuse options. The UVP function is disabled

for default option. Please contact local Hynetek sales for a device with options other than the default option.

OVER-TEMPERATURE PROTECTION

The HUSB238 integrates over-temperature protection function. It monitors the internal junction temperature. When the

junction temperature reaches the over temperature rising threshold, the HUSB238 requests 5V source PDO directly,

regardless of the previous established PDO, to reduce the total system power. When the junction temperature falls

below the over temperature falling threshold, the HUSB238 re-negotiates the previous PDO and tries to recover the

normal charging operation.

The over temperature thresholds are programmable by internal factory fuses. Please contact local Hynetek sales for a

device with options other than the default option.