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DS00002774G-page 13

USB4712

3.3

Configuration Straps and Programmable Functions

Configuration straps are multi-function pins that are used during Power-On Reset (POR) or external chip reset

(RESET_N) to determine the default configuration of a particular feature. The state of the signal is latched following de-

assertion of the reset. Configuration straps are identified by an underlined symbol name. This section details the various

device configuration straps and associated programmable pin functions.

3.3.1

NON-REMOVABLE PORT CONFIGURATION (CFG_NON_REM)

The CFG_NON_REM configuration strap is used to configure the non-removable port settings of the device to one of

two settings. These modes are selected by the configuration of an external resistor on the CFG_NON_REM pin. The

resistor options are a 200 kΩ pull-down and 200 kΩ pull-up as shown in Table 3-3.

3.3.2

BATTERY CHARGING CONFIGURATION (CFG_BC_EN)

The CFG_BC_EN configuration strap is used to configure the battery charging port settings of the device to one of two

settings. These modes are selected by the configuration of an external resistor on the CFG_BC_EN pin. The resistor

options are a 200 kΩ pull-down and 200 kΩ pull-up as shown in Table 3-4.

Note 3-2

BC1.2 must be enabled for Auto-FlexConnect feature to operate. USB4712PF may optionally leave

BC1.2 enabled or disabled with no negative effect to standard (non-Automatic) FlexConnect

operation.

Note:

The system designer must guarantee that configuration straps meet the timing requirements specified in

Section 9.6.2, "Power-On and Configuration Strap Timing" and Section 9.6.3, "Reset and Configuration

Strap Timing". If configuration straps are not at the correct voltage level prior to being latched, the device

may capture incorrect strap values.

TABLE 3-3:

CFG_NON_REM RESISTOR ENCODING

CFG_NON_REM Resistor Value

Setting

200 kΩ Pull-Down

Port 1 removable

200 kΩ Pull-Up

Port 1 non-removable

TABLE 3-4:

CFG_BC_EN RESISTOR ENCODING

CFG_NON_REM Resistor Value

Setting

200 kΩ Pull-Down

No battery charging

200 kΩ Pull-Up

Port 1 battery charging

Note:

The standard port does not support battery charging and OCS (Port 2). See Note 3-2.