STUSB1600 datasheet(38/69 Pages) STMICROELECTRONICS

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I2C register map

STUSB1600

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DocID028937 Rev 1

5.1.13

VBUS_MONITORING_RANGE_CTRL

Address: 22h

Access: R/W

Note: this register allows the low and high limits of the VBUS monitoring voltage range to be

changed during attachment.

The VBUS voltage is fixed at 5.0 V. The nominal values of the high and low limits of the

VBUS monitoring voltage range are respectively VBUS+5% and VBUS-5%. Each coefficient

represents the fraction of VBUS voltage that is added to the nominal value of each limit to

determine the new threshold value.

When the STUSB1600 is in unattached state, the register takes the reset values. When a

device is attached, the register takes the values set in the NVM (see Section 6: Start-up

configuration) or the new ones set by software during attachment.

The register is valid for both power roles. Depending on whether the device operates in

source power role or sink power role, the register takes the values set in the NVM related to

the running power role.

5.1.14

RESET_CTRL

Address: 23h

Access: R/W

Note: this register allows the device to be reset by software.

The SW_RESET_EN bit acts as the hardware RESET pin except that the I2C control

registers are not reset to their default values. They keep the last changed value. The

SW_RESET_EN bit does not command the RESET pin.

Table 30. VBUS_MONITORING_RANGE_CTRL register

Bit

Field name

Reset

Description

7:4

SHIFT_HIGH_VBUS_LIMIT

0000b

(NVM)

Coefficient to shift nominal high voltage

limit from 1 % (0001b) to 15 % (1111b) of

VBUS voltage by step of 1 %

3:0

SHIFT_LOW_VBUS_LIMIT

0000b

(NVM)

Coefficient to shift nominal low voltage limit

from -1 % (0001b) to -15 % (1111b) of VBUS

voltage by step of -1 %

Table 31. RESET_CTRL register

Bit

Field name

Reset

Description

7:1

Reserved

000000b

Do not use

SW_RESET_EN

0b: device reset is performed from hardware

RESET pin

1b: forces the device reset as long as this bit value

is set

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