Datasheet

HUSB238A

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FLGIN

The FLGIN pin is a digital input pin. It is an input source for interrupt. This interrupt can be set INT_N low if it is not

masked. Furthermore, this input signal can be mapped to disable GATE pin immediately by setting EN_FAULTIN bit.

Please note that, this digital output pin is Hi-Z during initialization.

INPUT AND OUTPUT PINS

There are 3 pins that are implemented by dual functions. They are all input and output pins. However, they perform

input pin only during initialization when the HUSB238A determines the settings by these pin. After the initialization, these

pins switches to output pin with push-pull output. These pins are DBG_N, EN_HVDCP/OUT1 and ADDR/ORIENT.

DEBUG_N PIN

The DEBUG_N pin is a push-pull output that indicate HUSB238A connection status in Table 11:

Table 11. DEBUG_N Pin Definition

DEBUG_N Status

Description

Low

Debug Accessory detected

High

Debug Accessory not detected

ORIENT PIN

The ORIENT pin is a push-pull output that indicate HUSB238A connection status in Table 12.

Table 12. ORIENT Pin Definition

ORIENT Status

Description

Low

STATUS[5:4]=00b,11b or 01b

High

STATUS[5:4]=10b

OUT1 PIN

The OUT1 pin is purely a general output pin, which can be controlled by the EN_OUT1.

CC LOGIC

HUSB238A is able to support the USB Type-C Rev.2.1. CC1 and CC2 pins are used to detect the attachment or

detachment with the external devices.

SOP VDM MESSAGES

HUSB238A supports Structured VDMs. Therefore, the Discover Identity, Discover SVIDs, Discover Modes, Enter Mode

and Exit Mode Commands are all supported by HUSB238A. HUSB238A can initial Structure VDMs via the

GO_COMMAND or respond a received Structure VDM REQ.

POLICY ENGINE

The following sections describes the system policy for typical applications.

SINK REQUESTED POWER DETERMINATION

The request data object (RDO) could be determined in different ways in different modes.

RDO IN GPIO MODE

The HUSB238A can request different voltage per the predetermined settings. There are two ways where the request

voltage can be set. One is the configuration of SNK_ISET and SNK_VSET pin and another way is the SNK_RDO2

Configurations. The HUSB238A compares the two values and uses the lower value as its target RDO in GPIO mode.

For example, if the SNK_VSET and SNK_ISET is configured as 9V / 3A. The SNK_RDO2 Configurations is 12V / 2A.

Then the RDO that HUSB238A requests from the PD source is 9V / 2A.

After the RDO is determined, the HUSB238A loops through the PD source PDOs from highest voltage first to find the

first PDO that satisfies the following conditions:

1.

SOURCE_PDO_VOLTAGE ≤ RDO_VOLTAGE

2.

SOURCE_PDO_CURRENT ≥ RDO_CURRENT