STUSB4500LBJR datasheet(14/31 Pages) STMICROELECTRONICS

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Start-up configuration

5.1

User-defined parameters

The STUSB4500L has a set of user-defined parameters that can be customized by NVM re-programming through

the I2C interface. This feature allows the customer to change the preset configuration of the USB Type-C interface

and to define a new configuration to meet specific application requirements addressing various use cases, or

specific implementations.

The NVM re-programming overrides the initial default setting to define a new default setting that is used at power-

up or after a reset. The default setting is copied at power-up, or after a reset, from the embedded NVM into I2C

registers. The values copied in the I2C registers are used by the STUSB4500L during the system operation.

The NVM re-programming is possible with a customer password. The I2C registers must be re-initialized after

each NVM re-programming to make effective the new parameters setting either through power-off and power-up

sequence, or through reset.

5.2

Default start-up configuration

The table below lists the user-defined parameters and indicates the default start-up configuration of the

STUSB4500L.

Table 13. STUSB4500L user-defined parameters and default settings

Parameter name

Parameter description

Reset

value

(default)

Value

Description

SHIFT_VBUS_HIGH_LIMIT

Coefficient to shift up nominal

VBUS high voltage limit applicable

to 5 V

1010b

(10%)

0000b to

1111b

0% ≤ VSHUSBH ≤ 15% of VBUS by

increment of 1%

Default VSHUSBH = 10%

VBUS_DISCH_TIME_TO_0V

Coefficient used to compute

VBUS discharge time to 0 V

1001b

(9)

0001b to

1111b

1 ≤ TDISPAR0V ≤ 15 by increment

of 1

Unit discharge time: 84 ms (typ.)

Default coefficient TDISPAR0V = 9,

discharge time TDISUSB0V= 756

VBUS_DISCH_DISABLE

VBUSdischarge deactivation on

VBUS_VS_DISCH and DISCH

pins

VBUS discharge enabled

VBUS discharge disabled

GPIO_CFG[1:0]

Selects GPIO pin configuration

(see Section 2.2.9 GPIO )

11b

00b

SW_CTRL_GPIO

01b

ERROR_RECOVERY

10b

DEBUG

11b

SINK_POWER (default)

STUSB4500L

Start-up configuration

DS13102 - Rev 1

page 14/31

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