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TUSB4041I

SLLSEK3E – JULY 2015 – REVISED SEPTEMBER 2017

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Copyright © 2015–2017, Texas Instruments Incorporated

8.3 Feature Description

8.3.1 Battery Charging Features

The TUSB4041I device provides support for USB battery charging. Battery charging support may be enabled on

a per port basis through the REG_6h(batEn[3:0]).

Battery charging support includes both CDP and DCP modes. The DCP mode is compliant with the Chinese

Telecommunications Industry Standard YD/T 1591-2009.

In addition to standard DCP mode, the TUSB4041I device provides a mode (AUTOMODE), which automatically

provides support for DCP devices and devices that support custom charging indication. When in AUTOMODE,

the port automatically switches between a divider mode and the DCP mode depending on the portable device

connected. The divided mode places a fixed DC voltage on the ports DP and DM signals, which allows some

devices to identify the capabilities of the charger. The default divider mode indicates support for up to 10 W. The

divider

mode

can

be

configured

to

report

a

legacy

current

setting

(up

to

5

W)

through

REG_Ah(HiCurAcpModeEn).

The battery charging mode for each port is dependent on the state of Reg_6h(batEn[n]), the status of the VBUS

input, and the state of REG_Ah(autoModeEnz) upstream port as identified in Table 1.

(1)

Auto-mode automatically selects divider-mode or DCP mode.

(2)

Divider mode can be configured for legacy current mode through register settings.

(3)

Attached USB device is USB battery-charging specification revision 1.2 compliant

(4)

Chinese Telecommunications Industry Standard YD/T 1591-2009

Table 1. TUSB4041I Battery Charging Modes

batEn[n]

VBUS

autoModeEnz

BC MODE PORT x

(x = n + 1)

0

Don’t care

Don’t care

Don’t Care

1

<4 V

0

Automode(1)(2)

1

DCP(3)(4)

>4 V

Don’t care

CDP(3)

8.3.2

USB Power Management

The TUSB4041I device can be configured for power-switched applications using either per-port or ganged

power-enable controls and overcurrent status inputs.

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

REG_5h(ganged).

The TUSB4041I device supports both active-high and active-low power-enable controls. The PWRCTL[4:1]

polarity is configured by REG_Ah(pwrctlPol).