TUSB8043RGCT datasheet(13/59 Pages) TI1

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TUSB8043

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8.3 Feature Description

8.3.1 Battery Charging Features

The TUSB8043 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 TUSB8043 will enable

DCP mode.

In addition to USB Battery charging (BC1.2), the TUSB8043 supports custom charging indications: Divider

Charging (ACP3, ACP2, ACP1 modes), and Galaxy compatible charging. 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. The default divider mode indicates support

for up to 10W (ACP3). The divider mode can be configured to report a lower-current setting (up to 5 W) through

REG_0Ah (HiCurAcpModeEn).

When the upstream port is not connected and battery charging support is enabled for a port, the TUSB8043

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

enabled and FullAutoEn bit is cleared (Reg_25h Bit 0), then TUSB8043 will start with highest enabled divider

current mode (ACPx). The TUSB8043 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 TUSB8043 will drive the port power enable inactive and switch

to Galaxy mode, if enabled, or to DCP mode if Galaxy mode is disabled. The TUSB8043 will again drive the port

power enable active. The TUSB8043 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 TUSB8043 will drive the port power enable inactive and transition to DCP

mode. The TUSB8043 will again drive the port power enable active. In DCP mode, the TUSB8043 will look for a

pull-up detected on DP pin or RxVdat. If a pull-up or RxVdat is detected on DP, the TUSB8043 will remain in

DCP mode. If no pull-up or RxVdat is detected on DP pin after 2 seconds, the TUSB8043 will drive the port

power enable inactive and transition back to ACPx mode. This sequence will repeat until upstream port is

connected.

When Automatic mode is enabled and full automatic mode (FullAutoEn Reg_25h bit 0) is enabled, TUSB8043

will perform same sequence described in previous paragraph with the addition of attempting all supported ACPx

modes before sequencing to Galaxy Mode (if enabled) or DCP mode.

The supported battery charging modes when TUSB8043 configured for SMBus or external EEPROM is detailed

in Battery Charging Modes with SMBus/EEPROM Table.

The supported battery charging modes when TUSB8043 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.

TUSB8043RGCT 数据表(PDF) 13 Page - Texas Instruments

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