TUSB8044AI datasheet(17/63 Pages) TI1

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TUSB8044A

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SLLSF92 – FEBRUARY 2019

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8.3.2

USB Power Management

The TUSB8044A can be configured for power switched applications using either per-port (Full power managed)

or ganged power-enable controls and over-current status inputs. When battery charge is enabled, the

TUSB8044A will always function in full power managed.

Power switch support is enabled by REG_5h (fullPwrMgmtz) and the per-port or ganged mode is configured by

REG_5h(ganged).

The TUSB8044A supports both active high and active low power-enable controls. The PWRCTL[4:1] polarity is

configured by REG_Ah(pwrctlPol). The power control polarity can also be selected by the PWRCTL_POL pin.

8.3.3 I2C Programming Support Using Internal HID to I2C Interface

The TUSB8044A I2C programming mode is supported using class-specific requests through the HID interface.

The HID's embedded port will be numbered 1 greater than the highest numbered exposed port. The internal HID

to I2C function of the TUSB8044A does not have an interrupt OUT endpoint. The TUSB8044A supports GET

REPORT (Input) through the HID interrupt and control endpoints. The GET REPORT (Feature) and SET

REPORT (Output) occurs through the control endpoint.

Table 3. HID Requests I2C Programming Support

COMMAND

bmRequestType

bRequest

wValue

wIndex

wLength

DATA

Setup field Offset

Offset = 0

Offset = 1

Offset = 2

Offset = 4

Offset = 6

N/A

GET REPORT

A1H

01H

0100H – input

0300H - feature

0000H

Report Length

Report

SET REPORT

21H

09H

0200H – output

0000H

Report Length

Report

Other HID class specific requests are optional and not supported (SET IDLE, SET PROTOCOL, GET IDLE, GET

PROTOCOL) . Also report IDs are not required since all requests are not interleaved.

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