STUSB1600 datasheet(41/69 Pages) STMICROELECTRONICS

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STUSB1600

I2C register map

5.1.19

VBUS_MONITORING_CTRL

Address: 2Eh

Access: R/W

Note: this register allows the default monitoring conditions of the VBUS voltage over the

power path from the VDD and VBUS_SENSE pins to be modified.

The VBUS_VALID_RANGE_DISABLE and VBUS_VSAFE0V_THRESHOLD bits are

defining monitoring conditions applicable to the VBUS_SENSE pin connected to the USB

Type-C receptacle side.

The VBUS_VALID_RANGE_DISABLE bit allows the valid VBUS voltage range condition to

be substituted by the VBUS UVLO threshold condition to establish a valid device attachment

and to assert the VBUS power path.

The VBUS_VSAFE0V_THRESHOLD bit indicates the voltage value of the VBUS vSafe0V

threshold used in source power role as a Type-C FSM condition to establish a valid device

attachment.

The VDD_UVLO_DISABLE and VDD_OVLO_DISABLE bits are defining monitoring

conditions applicable to the VDD supply pin when it is connected to the main power supply

in source power role only.

•

When UVLO detection is enabled, the VBUS_EN_SRC pin is asserted only if the

voltage on the VDD pin is above a UVLO threshold of 3.9 V.

•

When OVLO detection is enabled, the VBUS_EN_SRC pin is asserted only if the

voltage on the VDD pin is below a OVLO threshold of 6.0 V.

Table 36. VBUS_MONITORING_CTRL register

Bit

Field name

Reset

Description

Reserved

Do not use

VDD_OVLO_DISABLE

(NVM)

0b: enables OVLO threshold detection on VDD

1b: disables OVLO threshold detection on

VDD pin

Reserved

Do not use

VBUS_VALID_RANGE_DISABLE

(NVM)

0b: enables valid VBUS voltage range detection

1b: disables valid VBUS voltage range

detection

(UVLO threshold detection used instead)

Reserved

Do not use

2:1

VBUS_VSAFE0V_THRESHOLD

00b

(NVM)

00b: VBUS vSafe0V threshold = 0.6 V

01b: VBUS vSafe0V threshold = 0.9 V

10b: VBUS vSafe0V threshold = 1.2 V

11b: VBUS vSafe0V threshold = 1.8 V

VDD_UVLO_DISABLE

(NVM)

0b: enables UVLO threshold detection on VDD

1b: disables UVLO threshold detection on

VDD pin

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