TUSB8041A datasheet(13/57 Pages) TI1

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TUSB8041A

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8.3 Feature Description

8.3.1 Battery Charging Features

The TUSB8041A provides support for USB Battery Charging (BC1.2) and custom charging. Battery charging

support may be enabled on a per port basis through the REG_6h(batEn[3:0]).

USB Battery charging support includes both Charging Downstream Port (CDP) and Dedicated Charging Port

(DCP) modes. The DCP mode is compliant with the Chinese Telecommunications Industry Standard YD/T 1591-

2009. CDP is enabled when the upstream port has detected valid VBUS, configured, and host sets port power.

When the upstream port is not connected and battery charging support is enabled, the TUSB8041A will enable

DCP mode.

In addition to USB Battery charging (BC1.2), the TUSB8041A supports custom charging indications: Divider

Charging (ACP2, ACP1 modes). These custom charging modes are only supported when upstream port is

unconnected and AUTOMODE is enabled. When in AUTOMODE and upstream port is disconnected, the port will

automatically transition from ACP mode to 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. .

When the upstream port is not connected and battery charging support is enabled for a port, the TUSB8041A

drives the port power enable active. If AUTOMODE is disabled, then DCP mode is used. If AUTOMODE is

enabled, then TUSB8041A will start with highest enabled divider current mode (ACPx). The TUSB8041A will

remain in highest current mode as long as a pull-up is not detected on DP pin. If an pull-up is detected on DP

pin, then TUSB8041A will drive the port power enable inactive and switch to Galaxy mode, if enabled, or to DCP

mode if Galaxy mode is disabled. The TUSB8041A will again drive the port power enable active. The

TUSB8041A will remain in Galaxy mode as long as no pull-up is detected on DP pin. If an pull-up is detected on

DP pin, then TUSB8041A will drive the port power enable inactive and transition to DCP mode. The TUSB8041A

will again drive the port power enable active. In DCP mode, the TUSB8041A will look for a pull-up detected on

DP pin or RxVdat. If a pull-up or RxVdat is detected on DP, the TUSB8041A will remain in DCP mode. If no pull-

up or RxVdat is detected on DP pin after 2 seconds, the TUSB8041A will drive the port power enable inactive

and transition back to ACPx mode. This sequence will repeat until upstream port is connected.

The supported battery charging modes when TUSB8041A configured for SMBus or external EEPROM is detailed

in Battery Charging Modes with SMBus/EEPROM Table.

The supported battery charging modes when TUSB8041A configured for I2C but without an external EEPROM is

determined by the sampled state of the pins. These modes are detailed in Battery Charging Modes without

EEPROM Table.

Table 2. TUSB8041A Battery Charging Modes with SMBus Mode or I2C EEPROM

autoModeEnz Reg_0Ah Bit 1

BC Mode Port x

(x = n + 1)

Don’t Care

Don't Care

Don’t Care

No Charging support

> 4V

Don't Care

CDP

< 4V

Don't Care

DCP

< 4V

AUTOMODE enabled with High current mode divider disabled.

Alternate ACP1, DCP

< 4V

AUTOMODE enabled with High current mode divider enabled.

Alternate ACP2,DCP

TUSB8041A Datasheet(PDF) 13 Page - Texas Instruments

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